Climate and monthly weather forecastCozumel, 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 (83.5°F), beginning and ending the year, to an annual peak of 33°C (91.4°F), achievable in August. An examination of the low temperatures unveils a similar trend, ascending from 19.4°C (66.9°F) at the start of the year to a high of 23.8°C (74.8°F) in June. This progression, typical of tropical regions, is steady, with maximum and minimum temperatures maintaining a stable difference up to 10°C (50°F).

In terms of rainfall, the driest months are between March and April, with recorded averages as low as 32mm (1.26") to 45mm (1.77"). Conversely, the heaviest rainfall occurs from September to October, with precipitation levels peaking at a considerable 243mm (9.57"). 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 (78.8°F) to 29°C (84.2°F), 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 (87.6°F) to 32°C (89.6°F), 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 (9.45") to 243mm (9.57"), 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 (86°F) 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 (87.6°F) and a low of 20.7°C (69.3°F). By April, the heat slightly increases to a high of 32°C (89.6°F) while the low shifts to 21.8°C (71.2°F). Rainfall is sparse, spanning from 32mm (1.26") in March to 45mm (1.77") 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 (90.9°F) to 33°C (91.4°F) and average low temperatures peaking at 23.8°C (74.8°F) in June. Notably, sea temperatures steadily increase to their yearly peak of 29°C (84.2°F). 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 (4.37") in May, precipitation levels ramp up to a whopping 192mm (7.56") in June, although they drop slightly to 116mm (4.57") in July and further to 142mm (5.59") 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 (9.45") in September to an immense 243mm (9.57") in October before falling to 123mm (4.84") 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 (86°F) and lows just above 20°C (68°F). Sea temperatures also stick to late summer levels of 29°C (84.2°F), slowly descending to 28°C (82.4°F) 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 (83.5°F) in December to a slightly cooler 29.1°C (84.4°F) in February. Correspondingly, lows range from 20.3°C (68.5°F) in December to 19.4°C (66.9°F) in February.

Rainfall drops significantly during these months, starting at 107mm (4.21") in December and tailing off to 60mm (2.36") 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 (80.6°F) in December and 26°C (78.8°F) 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 (82.4°F) 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 (84.2°F), 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 (84.2°F) 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 (82.4°F), 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 »