Climate and monthly weather forecast
Cozumel, Mexico

Palm trees and clear blue waters on Chen Rio white sandy beach in Cozumel, Mexico
Palm trees and clear blue waters on Chen Rio white sandy beach in Cozumel, Mexico

The climate of Cozumel

Situated in the tropical region, Cozumel, Mexico, displays a climate classified under the Köppen system as Aw, known as Tropical Wet and Dry or Savanna. The year-round weather patterns conform to a distinctly tropical rhythm characterized by wet and dry seasons and a slight fluctuation in temperatures.

Monthly average temperatures range from 28.6°C, beginning and ending the year, to an annual peak of 33°C, achievable in August. An examination of the low temperatures unveils a similar trend, ascending from 19.4°C at the start of the year to a high of 23.8°C in June. This progression, typical of tropical regions, is steady, with maximum and minimum temperatures maintaining a stable difference up to 10°C.

In terms of rainfall, the driest months are between March and April, with recorded averages as low as 32mm to 45mm. Conversely, the heaviest rainfall occurs from September to October, with precipitation levels peaking at a considerable 243mm. The number of rainfall days mirrors the rainfall quantities, showing an escalation from a modest 3.7 days in April to a high of 15.7 days in October.

As expected in such tropical environments, the relative humidity is fairly high throughout the year, ranging from 79% in March and April to a peak level of 87% in September. The sea temperatures, congruous with land temperatures, provide a comfortable range from 26°C to 29°C, scaling from February to September.

The Best Time to Visit Cozumel

Visitors may find the barrier island of Cozumel most appealing during the spring months of March and April. With average high temperatures of 30.9°C to 32°C, only 4 to 3.7 rainy days and a reasonable humidity level of 79%, the weather is significantly pleasant. Notably, the period aligns with spring break, making it an opportune moment for tourists.

Also noteworthy is the considerable daylight availability, extending from 12 to 12.6 hours, coupled with a beneficial UV index of 11 to 12. This timeframe presents perfect conditions for outdoor activities and exploration of the natural beauty that Cozumel offers.

The Worst Time to Visit Cozumel

The months of September and October prove less inviting due to heavy rainfall averaging 240mm to 243mm, amounting to the highest precipitation levels in the year. A peak number of rainy days (15.4 to 15.7) and a relatively high humidity of 87% to 85% typify this period.

Despite bearable temperatures, around the 30°C mark, and still warm sea temperatures, the excessive rainfall can drastically limit outdoor activities and sightseeing expeditions. Excursions during these months should be carefully planned, taking into account the unpredictable weather dynamics.

Spring Weather in Cozumel

Spring ushers in some of the best weather conditions in Cozumel. March marks the beginning of the season with an average high temperature of 30.9°C and a low of 20.7°C. By April, the heat slightly increases to a high of 32°C while the low shifts to 21.8°C. Rainfall is sparse, spanning from 32mm in March to 45mm in April, with only about four rainy days in each month.

Furthermore, a moderate relative humidity of 79% and extended daylight hours, from 12 to 12.6, add more comfort to exploring the city. Significantly, enhanced UV exposure, rated at 11 to 12 during these months, necessitates utmost sun protection during outdoor activities.

Summer Weather in Cozumel

The summer season in Cozumel, runing from May to August, offers average high temperatures from 32.7°C to 33°C and average low temperatures peaking at 23.8°C in June. Notably, sea temperatures steadily increase to their yearly peak of 29°C. Meanwhile, daylight hours decrease from 13.1 in May to 12.8 in August.

However, rainfall patterns change significantly during this period. Starting with 111mm in May, precipitation levels ramp up to a whopping 192mm in June, although they drop slightly to 116mm in July and further to 142mm in August. Despite such variations in rainfall, the city maintains high levels of humidity, around 80% in May, peaking at 84% from June to August.

Autumn Weather in Cozumel

Autumn in Cozumel, extending from September to November, is typified by the year's highest rainfall levels. Measurements rise from a hefty 240mm in September to an immense 243mm in October before falling to 123mm in November. The number of rainy days also spikes, hitting its zenith at 15.7 days in October.

Despite the heavy precipitation, temperatures remain fairly warm, with highs hovering around 30°C and lows just above 20°C. Sea temperatures also stick to late summer levels of 29°C, slowly descending to 28°C in November. Relative humidity remains high during these months, usually above 80%.

Winter Weather in Cozumel

Winter in Cozumel, spanning from December to February, is a season of subtropical warmth and reduced rainfall. Temperatures during this period are relatively mild with high averages falling from 28.6°C in December to a slightly cooler 29.1°C in February. Correspondingly, lows range from 20.3°C in December to 19.4°C in February.

Rainfall drops significantly during these months, starting at 107mm in December and tailing off to 60mm in February. The combined effect of less rainfall and warm, pleasant temperatures makes winter an inviting time to visit Cozumel. Sea temperatures are also inviting at this time of year, registering a comfortable range between 27°C in December and 26°C in February.

Weather in January

The start of the year in Cozumel, Mexico is characterized by a gentle rise in temperatures from the cooler winter months. Moderate humidity and an increase in rainfall contribute to a balmy climate. Daylight lasts slightly over 11 hours, providing ample time for outdoor activities. Weather in January »

Weather in February

In February, the weather starts to shift with a decrease in rainfall compared to January. Daylight hours gradually increase, signaling the approach of warmer seasons. A relative reduction in sea temperature stimulates aquatic life, making it a good period for underwater exploration. Weather in February »

Weather in March

Transitioning into March brings a noticeable increase in daylight and sunshine hours, hinting at the arrival of summer. The weather continues to heat up, and the UV index jumps to its annual peak, underscoring the importance of sunblock. Weather in March »

Weather in April

April harbors the onset of the dry season, with lower rainfall amounts compared to previous months. Daylight continues to stretch, paving the way for extended outdoor sessions. The UV index remains high, making sunglasses and hats indispensable accessories. Weather in April »

Weather in May

Shifting towards May results in warmer temperatures and an increase in relative humidity as the dry season persists. Most days are sunlit and long, creating suitable conditions for sightseeing and exploring Cozumel. A high UV index of 12 advises caution when outdoors between sunup and sundown. Weather in May »

Weather in June

June introduces the wet season in Cozumel. Despite a rise in rainfall, it doesn't thwart the steady rise in temperatures, hinting at the sweltering days ahead. A profound shift in sea temperature to 28°C favors divers and water sports enthusiasts. Weather in June »

Weather in July

The weather in July coincides with the apex of summer, suggesting high temperatures and prevailing humidity. Long summer days provide plenty of daylight for tourist activities. The sea temperature remains high at 29°C, offering ideal conditions for swimming and water sports. Weather in July »

Weather in August

August continues the summer trend, with persistent high temperatures and humidity levels. Extended daylight hours and a steady sea temperature of 29°C provide optimal conditions for beach activities. Still, the UV index remains high, highlighting the need for adequate sun protection. Weather in August »

Weather in September

In September, the weather in Cozumel begins a gradual transition towards the cooler months. A slight dip in daylight hours is compensated by increased sunshine, providing abundant hours for outdoor pursuits. The UV index drops to 11, but sun protection remains a must. Weather in September »

Weather in October

As October dawns, the rainfall continues to dominate the Cozumel weather. A further decrease in daylight hours suggests the forthcoming arrival of winter. The UV index dips to 9, but sun protection remains essential during midday. Weather in October »

Weather in November

The transition towards winter becomes evident in November, with a decrease in daylight and sunshine hours. The sea temperature cools down to 28°C, yet remains warm enough for water activities. Subtle shifts in humidity and UV index indicate the onset of the cooler, drier season. Weather in November »

Weather in December

December marks the end of the year with the onset of winter, characterized by shorter daylight hours and a further drop in sea temperature. The UV index decreases to 7, but sun protection remains advisable during peak sun hours. Weather in December »


What month is the coldest in Cozumel?

Cozumel's temperatures tend to hit their minimum during January and December, with an average high-temperature of 28.6°C.

How much does it rain in Cozumel?

In Cozumel, during the entire year, the rain falls for 119.9 days and collects up to 1490mm of precipitation.

What are the months with the lowest UV index in Cozumel?

January and December, with an average maximum UV index of 7, are months with the lowest UV index in Cozumel, Mexico.

When is the sea coldest in Cozumel?

The months with the coldest seawater in Cozumel are February and March, with an average sea temperature of 26°C.

What are the least humid months in Cozumel?

March and April, with an average relative humidity of 79%, are the least humid months.

What is the driest month in Cozumel?

The month with the least rainfall in Cozumel, Mexico, is March, when the rain falls for 4 days and typically collects 32mm of precipitation.

What month has the most sunshine in Cozumel?

April has the most sunshine of the year, with an average of 8.6h of sunshine.

What are the months with the highest UV index in Cozumel?

The months with the highest UV index in Cozumel are April through August, with an average maximum UV index of 12.

When are the longest days in Cozumel?

With an average of 13h and 24min of daylight, June has the longest days of the year.

When is the sea warmest in Cozumel?

The months with the warmest seawater are July through October, with an average sea temperature of 29°C.

What month is the hottest in Cozumel?

Cozumel's August weather reaches an average high of 33°C and an average low of 23.5°C, making it the warmest month.

What is the most humid month in Cozumel?

September is the most humid month, with an average relative humidity of 87%.

What is the month with the least sunshine in Cozumel?

September and November, with an average of 6.1h of sunshine, are months with the least sunshine.

What is the rainiest month in Cozumel?

October is the month with the most rainfall. Rain falls for 15.7 days and accumulates 243mm of precipitation.

What is the month with the shortest days in Cozumel?

December has the shortest days of the year, with an average of 10h and 54min of daylight.

Is there Daylight Saving Time (DST) in Cozumel?

Cozumel does not observe Daylight Saving Time (DST). EST timezone is used throughout the entire year.

Average temperature
Cozumel, Mexico

Average temperature - Cozumel, Mexico

The warmest month (with the highest average high temperature) is August (33°C).
The months with the lowest average high temperature are January and December (28.6°C).

The month with the highest average low temperature is June (23.8°C).
The coldest months (with the lowest average low temperature) are January and February (19.4°C).


Average humidity
Cozumel, Mexico

Average humidity - Cozumel, Mexico

The month with the highest relative humidity is September (87%).
The months with the lowest relative humidity are March and April (79%).


Average rainfall
Cozumel, Mexico

Average rainfall - Cozumel, Mexico

The wettest month (with the highest rainfall) is October (242.5mm).
The driest month (with the least rainfall) is March (32.2mm).


Average rainfall days
Cozumel, Mexico

Average rainfall days - Cozumel, Mexico

The month with the highest number of rainy days is October (15.7 days).
The month with the least rainy days is April (3.7 days).


Average sea temperature
Cozumel, Mexico

Average sea temperature - Cozumel, Mexico

The best months for swimming (with the highest average sea temperature) are July, August, September and October (29°C).
The coldest months (with the lowest average sea temperature) are February and March (26°C).


Average daylight / Average sunshine
Cozumel, Mexico

Average daylight / Average sunshine - Cozumel, Mexico

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).

The month with the most sunshine is April (Average sunshine: 8h and 36min).
The months with the least sunshine are September and November (Average sunshine: 6h and 6min).


Average UV index
Cozumel, Mexico

Average UV index - Cozumel, Mexico

The months with the highest UV index are April, May, June, July and August (UV index 12).
The months with the lowest UV index are January and December (UV index 7).


Cozumel, Mexico

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