Cozumel Weather by Month
Cozumel stays warm throughout the year, but rainfall changes sharply by season. Historical average highs range from 28.6°C in January and December to 33°C in August. March and April are relatively dry, while September and October receive the most rain in the available monthly climate table. Those patterns make the calendar more useful for managing rain and storm risk than for chasing a truly cool month.
- Choose March or April if relatively low historical rainfall is your main priority.
- Expect the greatest historical rainfall in September and October.
- Plan for stronger heat from late spring through early autumn.
- Treat June through November as hurricane-season travel and favor flexible arrangements.
- Check short-range forecasts, marine notices, and beach conditions again shortly before each activity.
No month is guaranteed to be dry. Even the relatively dry months have recorded rainfall in the historical averages, and a monthly total cannot tell you when showers will arrive during one particular vacation. Use this guide to compare broad seasonal tradeoffs, then rely on a current forecast as your travel dates approach.
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The figures below come from a World Meteorological Organization climatology covering 1951 through 1980. That makes them a useful historical baseline rather than current climate normals or a prediction for your trip. The best planning method is to combine the long-term pattern with flexible reservations and same-day checks for outdoor or marine plans.
Cozumel’s climate at a glance
Temperature changes are modest compared with rainfall. Winter and early spring bring slightly lower heat and generally less rain. Conditions become hotter by late spring, while rainfall is concentrated mainly between June and October. The historical table reaches its highest average monthly rain totals in September and October.
This distinction matters when planning a day outdoors. In a relatively dry month, heat protection may be the main concern. During a wetter month, keep the same sun protection but add a lightweight rain layer, a dry pouch, and enough schedule flexibility to move an exposed activity.
Monthly temperature and rainfall averages
| Month | Average low | Average high | Monthly rain | Rain days |
|---|---|---|---|---|
| January | 19.4°C | 28.6°C | 81.4 mm | 8.7 |
| February | 19.4°C | 29.1°C | 60.0 mm | 6.5 |
| March | 20.7°C | 30.9°C | 32.2 mm | 4.0 |
| April | 21.8°C | 32.0°C | 44.8 mm | 3.7 |
| May | 22.9°C | 32.7°C | 110.6 mm | 7.2 |
| June | 23.8°C | 32.4°C | 191.7 mm | 12.6 |
| July | 23.5°C | 32.6°C | 115.5 mm | 11.8 |
| August | 23.5°C | 33.0°C | 141.7 mm | 13.4 |
| September | 23.6°C | 31.9°C | 240.2 mm | 15.4 |
| October | 23.1°C | 30.7°C | 242.5 mm | 15.7 |
| November | 21.7°C | 29.7°C | 122.5 mm | 11.1 |
| December | 20.3°C | 28.6°C | 106.8 mm | 9.8 |
Rain days are averages, not a count promised for any future month. They also do not reveal the timing, duration, or intensity of rain. A vacation containing several rain days can still include usable outdoor periods, while one concentrated weather system can disrupt carefully timed plans. Avoid building an itinerary that depends on every day following the monthly average.
January and February: lower heat and moderate rainfall
January weather
January has an average low of 19.4°C and an average high of 28.6°C. Historical rainfall totals 81.4 mm across 8.7 rain days. It shares the lowest average daytime high in the table with December, making it one of the milder choices for travelers who find Cozumel’s warmer months tiring.
February weather
February remains comparatively mild, with averages of 19.4°C at the low end and 29.1°C at the high end. Its 60 mm of historical rainfall is lower than January’s total, and the table records 6.5 rain days. Pack for warmth, but include a light layer for the cooler end of the monthly temperature range.
March and April: the driest historical window
March weather
March records the lowest monthly rainfall total in the table at 32.2 mm, spread across an average of four rain days. Temperatures rise to an average low of 20.7°C and high of 30.9°C. It offers the strongest historical combination of lower rainfall and slightly gentler heat than the late spring and summer months.
April weather
April averages 44.8 mm of rainfall and 3.7 rain days. That is the fewest average rain days in the table, although March has the lower total rainfall. The average high reaches 32°C, so April already feels closer to the hotter part of the year. Prioritize shade breaks and carry drinking water during exposed plans.
May: hotter weather and rising rain
May marks a clear shift. The average low is 22.9°C, the average high is 32.7°C, and monthly rainfall rises to 110.6 mm across 7.2 rain days. Travelers gain no guarantee about the timing of those showers, but the broader pattern supports adding a backup plan to days built around exposed outdoor activities.
May also falls within the island government’s usual April-through-September description of sargassum season. That does not mean every beach will be affected. Conditions can differ between beaches and change quickly, so consult recent local information before choosing a beach day. A guide to the best beaches in Cozumel can help you compare locations once current conditions are known.
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June: rainy-season planning becomes important
June averages a low of 23.8°C and a high of 32.4°C. Historical rainfall climbs to 191.7 mm across 12.6 rain days. Municipal climate material says rainfall is concentrated mainly from June through October, so June is a sensible point to begin treating rain flexibility as a central part of the itinerary rather than a minor precaution.
June 1 also begins the official Caribbean hurricane season, which continues through November 30. Most trips during this six-month period are not automatically storm-affected, but tropical systems can disrupt marine activities and transportation. Where possible, choose flexible or refundable arrangements and monitor official weather information before departure.
July and August: sustained heat with variable rain
July weather
July averages 23.5°C at night and 32.6°C during the day. Its historical rainfall total is 115.5 mm across 11.8 rain days, lower than June’s total but still well above March and April. Avoid assuming that this dip creates a reliably dry interval. It remains within both the rainy period and hurricane season.
August weather
August reaches the highest average daytime temperature in the table at 33°C. The average low is 23.5°C, with 141.7 mm of rain across 13.4 rain days. Plan demanding outdoor time conservatively, protect electronics and documents from sudden rain, and leave room to shift marine plans if official advisories or an operator’s safety assessment require it.
Reef outings are especially dependent on safe operating conditions. The Cozumel Reefs National Marine Park guide provides useful context for planning activities in the protected marine area, but conditions and operator decisions still need to be checked on the day of travel.
September and October: the wettest historical months
September weather
September averages 23.6°C to 31.9°C. Its 240.2 mm of historical rainfall is spread across 15.4 rain days, making it the second-wettest month by total rainfall in the table. It also sits within hurricane season, so travelers should protect the most important bookings with flexible terms and avoid rigid chains of weather-sensitive activities.
October weather
October has the highest monthly rainfall total at 242.5 mm and the most rain days at 15.7. Average temperatures range from 23.1°C to 30.7°C. The heat is slightly lower than in August, but the rain pattern demands more flexibility. Keep at least one easily moved day in the itinerary instead of assigning every activity to a fixed outdoor slot.
November and December: easing heat after the wettest period
November weather
November averages 21.7°C to 29.7°C, with 122.5 mm of rain across 11.1 rain days. Rainfall drops substantially from October but remains meaningful. Hurricane season officially continues through November 30, so early and mid-month travel still calls for the same monitoring and flexible-booking habits used during summer and early autumn.
December weather
December returns to an average high of 28.6°C and an average low of 20.3°C. Historical rainfall measures 106.8 mm across 9.8 rain days. It is cooler than the late spring and summer period, but it is not rain-free. A compact rain layer still belongs in the bag beside sun protection.
How hurricane season changes trip planning
The official Caribbean hurricane season runs from June 1 through November 30. Cozumel’s municipal government convened its hydrometeorological committee for the 2026 season and advised readiness for tropical storms and hurricanes. Being inside the season does not predict a storm on your dates, but it raises the importance of monitoring official information.
- Read cancellation and change terms before paying for accommodation, transportation, or tours.
- Favor refundable or flexible arrangements when the price difference suits your budget.
- Monitor official forecasts before departure and throughout the trip.
- Confirm marine activities directly with the operator close to departure time.
- Keep essential medicine, documents, and charging equipment protected and easy to carry.
Travel connections can also be affected by severe weather, but the available evidence does not support assigning month-specific cancellation rates. If your journey includes the mainland crossing, review the Playa del Carmen to Cozumel ferry guide for the route itself, then confirm current service information directly before travel.
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What sargassum season means for beach plans
Cozumel’s government has described April through September as the usual sargassum season, while noting that atypical arrivals can occur. This is a planning window, not a promise that seaweed will appear on a particular beach. Beach conditions can differ around the island and change quickly.
Do not choose or reject an entire month solely on the basis of sargassum. Check recent official updates and contact your accommodation or beach operator shortly before visiting. Dated reports about clean beaches describe conditions at that moment only and cannot establish what you will find on a future trip.
Choose a month by your main priority
| Priority | Months to consider | Main tradeoff |
|---|---|---|
| Lowest historical rainfall | March and April | Daytime highs average 30.9°C and 32°C |
| Lower average daytime heat | January, February, November, and December | Rain remains possible in every month |
| Avoid official hurricane season | December through May | May is hotter and wetter than March or April |
| Comfort with wetter conditions | June through October | Higher rain risk and hurricane-season precautions |
| Avoid the wettest historical totals | Any month except September and October | Other months can still receive substantial rain |
For a first visit, the best month is the one that fits your heat tolerance, rain flexibility, and booking preferences. The Complete Guide to Cozumel for First Timers can help place these weather choices inside a broader island plan. Avoid treating historical climate alone as a verdict on accommodation, crowds, or costs because those points require separate current research.
What to pack for Cozumel’s weather
- Light, breathable clothing for warm daytime temperatures
- A compact rain jacket or poncho, including during relatively dry months
- Sun protection suitable for exposed outdoor plans
- A reusable water bottle for hot days
- A dry pouch for documents, medication, and electronics
- A light extra layer for the cooler end of winter’s temperature range
Pack for the activity as well as the month. A waterproof pouch may matter more on a boat than an umbrella, while a light rain layer is easier to manage during a walking day. Travelers with mobility or medical requirements should ask providers directly about weather contingencies because current accessibility arrangements were not established in the available research.
Use climate averages and forecasts together
Begin with monthly averages when selecting a season. Shift to a current forecast as the trip approaches, then make same-day checks before a boat trip, beach visit, or transportation connection. This layered approach respects what climate data can tell you without asking it to predict a specific afternoon.
No reliable current official source located in this research established islandwide sargassum conditions, ferry or flight disruptions, beach closures, or marine restrictions for July 23, 2026. Those operational details can change quickly and require a fresh check rather than a conclusion drawn from historical monthly weather.
Frequently asked questions
What is the driest month in Cozumel?
March has the lowest historical monthly rainfall total in the available WMO table at 32.2 mm. April has slightly more total rain at 44.8 mm but fewer average rain days, with 3.7 compared with March’s 4.0. Neither month is guaranteed to be rain-free.
What are the rainiest months in Cozumel?
September and October are the wettest months in the historical table. September averages 240.2 mm of rain, while October averages 242.5 mm. The municipal development plan also says rainfall is concentrated mainly from June through October.
What is the hottest month in Cozumel?
August has the highest average daytime temperature in the historical table at 33°C. May, June, July, and September also have average highs above 31°C, so the hotter period extends across several months.
When is hurricane season in Cozumel?
The official Caribbean hurricane season runs from June 1 through November 30. Travel during this period is not necessarily storm-affected, but flexible bookings and close monitoring of official forecasts are sensible because tropical weather can disrupt transportation and marine activities.
Can it rain during Cozumel’s dry season?
Yes. The historical table records average rainfall in every month. March and April are relatively drier, not rain-free, and monthly averages cannot predict the weather on specific travel dates.
When is sargassum season in Cozumel?
Cozumel’s municipal government has described April through September as the usual sargassum season, while noting that atypical arrivals can occur. Conditions vary by beach and can change quickly, so check recent local information instead of assuming the whole island will be affected.
Is December or January cooler in Cozumel?
December and January share the lowest average high in the historical table at 28.6°C. January has the lower average nighttime temperature at 19.4°C, compared with 20.3°C in December.
How far ahead can monthly weather averages predict a Cozumel trip?
Monthly averages show long-term seasonal direction, especially the contrast between relatively dry spring weather and wetter late summer and autumn conditions. They cannot predict individual storms, daily rainfall, marine restrictions, or transportation disruptions. Check current official information near your travel dates.
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