September Weather in Isla Cozumel, Mexico

Last updated: April 22, 2025

Experience the delightful September climate of Isla Cozumel, Mexico, where temperatures typically reach a maximum of 30°C (86°F) and settle at a comfortable average of 21°C (70°F). With a minimum temperature of 16°C (61°F), the weather offers a pleasant warmth ideal for beach activities and outdoor exploration. Remarkably, precipitation is minimal this month, with only 6 mm (0.2 in) of rainfall recorded across 0 days, leaving plenty of opportunities to soak up the sun. Coupled with a humidity level of 52%, Cozumel’s September weather invites visitors to enjoy its stunning landscapes and vibrant culture in perfect comfort.

September Temperature in Isla Cozumel

In September, Isla Cozumel experiences warm and inviting temperatures, with a minimum of 16°C (61°F) and an average of 21°C (70°F). This month marks a peak in heat, as the maximum can reach a steamy 30°C (86°F), contributing to the island's tropical allure. Following the gradual increase in warmth from May through August, September maintains the elevated warmth, making it ideal for beach enthusiasts and outdoor adventurers alike. As the summer slowly transitions to fall, the balmy climate is perfect for soaking in the sun or exploring the vibrant underwater life that Cozumel is famous for.

September Weather in Isla Cozumel: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Isla Cozumel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec575657606164697169676257
Data source: Temperature data for Isla Cozumel generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Isla Cozumel

In September, Isla Cozumel experiences a dramatic shift in precipitation patterns, with rain diminishing to a mere 6 mm (0.2 in) across the entire month, marking it as one of the driest periods of the year. This aligns with a notable trend observed in the preceding summer months, where July and August also recorded minimal rainfall, each just 5 mm (0.2 in). Interestingly, September stands out with zero precipitation days, a rarity in the overall yearly cycle. As residents and visitors enjoy the typically sunny skies, it becomes evident that the island transitions from the wet season to drier conditions, paving the way for a more tranquil October ahead, which brings a slight increase to 14 mm (0.6 in) over a couple of rainy days. This noteworthy drop in rainfall during September signifies the tail end of the summer's moisture, offering a brief respite before the winter months introduce a more gradual return of rain.

September Precipitation Trends in Isla Cozumel

The chart displays monthly precipitation patterns in Isla Cozumel, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec60755727267556143568
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Isla Cozumel

In September, Isla Cozumel experiences a notable rise in humidity, reaching 52%, a slight increase from the summer months, which are characterized by notably lower humidity levels around 42% in August. This transitional month signals the onset of a more comfortable, moderate atmosphere, following the drier conditions of late summer. As the island shifts towards autumn, humidity trends gradually climb, with subsequent months like October and November showing further increases to 58% and 66%, respectively. Overall, September acts as a pivotal bridge, blending the remnants of summer's dry heat with the encroaching moisture of fall, creating a unique and inviting environment for visitors.

September Average Humidity in Isla Cozumel

This chart illustrates the average monthly humidity levels in Isla Cozumel, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Isla Cozumel

In September, Isla Cozumel, Mexico, experiences a UV Index of 10, placing it in the very high exposure category with a burn time of just 15 minutes. This marks a slight decrease from the peak extreme levels of previous months—May to August, all at 11—but still signifies a need for caution when enjoying the sun. As the year progresses, we see a trend where the UV Index tends to rise from the moderate levels of January to the extreme highs of the summer months, making early autumn a crucial time to protect your skin. Planning outdoor activities? Be sure to check the UV Index and stay safe! For more insights on UV levels, visit Isla Cozumel UV Index.

Maximum UV Index Levels in Isla Cozumel for September

The chart shows the monthly maximum UV Index (UVI) for Isla Cozumel in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111110754
Data source: Isla Cozumel September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Isla Cozumel

September shines brightly in Isla Cozumel, Mexico, boasting 318 hours of glorious sunshine. This month continues the trend of near-summertime brilliance, although it sees a gentle dip from the peak of 375 hours in July. Following the vibrant summer months, September transitions into a blend of warmth and occasional refreshing breezes. As the tropical days wane into autumn, this island paradise still offers a generous share of sunlight, showcasing its beauty while inviting visitors to bask in its lingering rays. With a steady glow that lingers into fall, September remains a perfect time to explore the stunning beaches and rich culture of Cozumel.

Monthly Sunshine Duration in Isla Cozumel: September Highlighted

The September sunshine duration represents the total number of hours Isla Cozumel experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec196h243h299h324h359h364h375h360h318h298h258h236h
Data source: Isla Cozumel September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Isla Cozumel During September

As summer transitions into fall, Isla Cozumel experiences an impressive 67% chance of sunny weather in September. This marks a notable rise compared to the preceding months, highlighting September as one of the sunniest times of the year. Following the peak sunshine months of August and October, the sunny disposition of September stands out, ensuring plenty of opportunities for outdoor adventures. With the likelihood of clear skies remaining higher than many other months, vacationers can expect to enjoy both sunny days and the lush, vibrant scenery that defines this tropical paradise.

Percentage of Sunny Days in September in Isla Cozumel

The chart illustrates the percentage of sunny days in Isla Cozumel throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Isla Cozumel experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec63%61%61%51%49%49%53%63%67%64%63%45%
Data source: Isla Cozumel September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Isla Cozumel in September

As summer transitions into autumn in Isla Cozumel, Mexico, September marks a subtle shift in daylight duration, with the sun gracing the island for 12 hours. This represents a slight decrease from the 14 hours enjoyed during the peak of summer in June and July, as the days gradually shorten leading into the fall months. Interestingly, September's daylight mirrors that of March, showcasing a balance between the lengthening days of spring and the retreating daylight of late fall. While daylight remains abundant compared to the winter months, this trend hints at the approaching seasonal changes, providing a perfect backdrop for those eager to savor the last remnants of summer warmth.

Average Daylight Hours in Isla Cozumel for September

The chart illustrates the variation in daylight duration in Isla Cozumel throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 16m11h 1m12h13h13h 50m14h 14m14h 1m13h 16m12h 19m11h 19m10h 27m10h 2m
Data source: Isla Cozumel daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Isla Cozumel

As September arrives in Isla Cozumel, the average wind speed settles at a gentle 2.9 m/s (7 mph), mirroring the breezy conditions of the preceding summer months. This consistency in wind patterns suggests a calming atmosphere, perfect for beachgoers and water sports enthusiasts alike. Following the typical trend observed throughout the year, where wind speeds tend to hover around 2.8 to 3.3 m/s, September maintains a balance that invites relaxation and exploration. The gentle gusts also hint at the transition into autumn, offering a subtle shift that enhances the island's enchanting allure.

Average September Wind Speed in Isla Cozumel

The chart displays monthly wind speed patterns in Isla Cozumel, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.22.73.33.12.93.12.92.92.9 m/s2.82.53.1
Data source: Isla Cozumel September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Isla Cozumel Compares to Other Months

The weather in Isla Cozumel changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Isla Cozumel and find detailed weather information for every month.

In comparing the weather between September and January, September boasts a warmer climate with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 30°C (86°F), alongside low precipitation of just 6 mm (0.2 in) and only a few days of humidity clocking in at 52%. Conversely, January presents a cooler atmosphere with temperatures dipping to a minimum of 7°C (45°F) and averaging around 14°C (57°F), while precipitation significantly increases to 60 mm (2.3 in) over 6 days and humidity rises to 72%. For a detailed look at January conditions, visit Isla Cozumel weather in January.

September and February present contrasting weather patterns. In September, temperatures range from a minimum of 16°C to a maximum of 30°C, with a pleasant average of 21°C. The month is largely dry, featuring just 6 mm of precipitation and maintaining a comfortable humidity level of 52%. In stark contrast, February experiences cooler temperatures, with a low of 6°C and a high reaching 25°C, averaging only 13°C. This month is much wetter, accumulating 75 mm of rainfall over seven days and exhibiting higher humidity at 77%. For more details on February weather in Isla Cozumel, visit Isla Cozumel weather in February.

In September, the weather tends to be warm and dry, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 30°C (86°F) and an average temperature of 21°C (70°F). This month sees very little precipitation, with only 6 mm (0.2 in) and typically no rainy days, resulting in a comfortable humidity level of 52%.

In contrast, March experiences cooler temperatures, with a minimum of 7°C (45°F) and a maximum of 24°C (76°F), leading to an average of 14°C (57°F). This month is much wetter, with 57 mm (2.2 in) of rainfall over approximately 10 days and higher humidity at 67%. For more detailed insights into March weather, visit Isla Cozumel weather in March.

In September, the weather tends to be warmer with average temperatures around 21°C (70°F) and maximums reaching up to 30°C (86°F), while April is cooler with an average of 15°C (60°F) and a maximum of 27°C (81°F). September boasts minimal precipitation, with only 6 mm (0.2 in) and no rainy days, creating a dry and pleasant atmosphere. In contrast, April experiences more rainfall, totaling 27 mm (1.1 in) over four days, leading to slightly higher humidity levels at 56%. For more detailed information about the weather in April, visit Isla Cozumel weather in April.

In September, the weather tends to be warmer, with temperatures ranging from a mild 16°C (61°F) to a high of 30°C (86°F) and an average temperature of 21°C (70°F). The humidity is relatively moderate at 52%, and it experiences minimal precipitation, with no rainy days recorded. In contrast, May offers cooler temperatures, ranging from a minimum of 11°C (52°F) to a maximum of 24°C (76°F), with an average of 16°C (61°F). May is wetter, with 26 mm (1.0 in) of rain falling over approximately six days, and a slightly lower humidity at 46%. For more detailed insights on weather conditions, check out Isla Cozumel weather in May.

When comparing the weather in September and June, September typically brings warmer temperatures, with an average of 21°C (70°F) and a maximum of 30°C (86°F), while June has a slightly cooler average of 18°C (65°F) and a maximum of 27°C (80°F). Both months experience minimal precipitation, with September receiving only 6 mm (0.2 in) and June slightly higher at 7 mm (0.3 in), yet neither sees rain on any given day. Humidity in September is a bit higher at 52%, compared to June's 48%, contributing to a more sultry feel by the end of summer. For more detailed information, you can check out Isla Cozumel weather in June.

In September, the weather is slightly warmer with maximum temperatures reaching up to 30°C (86°F), compared to July's max of 28°C (83°F). Both months share similar minimum temperatures around 16°C (61°F), and their average temperatures are almost identical, at 21°C (70°F) for September and 21°C (69°F) for July. Precipitation levels remain low in both months, with September receiving 6 mm (0.2 in) and July slightly lower at 5 mm (0.2 in), and neither month experiencing rainy days. Humidity is also a tad higher in September at 52% compared to 46% in July. For a more detailed look at July weather, visit Isla Cozumel weather in July.

In comparing the weather between September and August, both months exhibit similar average temperatures, but there are some notable differences. September tends to have slightly cooler minimum and maximum temperatures, with a minimum of 16°C (61°F) and a maximum of 30°C (86°F), while August ranges from 17°C (62°F) to a maximum of 28°C (83°F). Rainfall levels are quite comparable, with September receiving 6 mm (0.2 in) and August experiencing just 5 mm (0.2 in) of precipitation. Interestingly, September has a higher humidity level at 52%, compared to August’s 42%. For more specific details about August weather, you can check Isla Cozumel weather in August.

September typically enjoys warmer temperatures, with averages around 21°C (70°F) and maximums reaching up to 30°C (86°F), accompanied by low precipitation and moderate humidity at 52%. In contrast, October sees a slight drop in average temperatures to 19°C (67°F) while still experiencing highs of 32°C (90°F). This month also brings increased rainfall, with 14 mm (0.6 in) spread over two days, and a slight rise in humidity to 58%. For a more detailed look at October weather in this region, check out Isla Cozumel weather in October.

September and November exhibit notable differences in weather patterns. September typically enjoys warmer temperatures, with a minimum of 16°C (61°F) and an average of 21°C (70°F), reaching a maximum of 30°C (86°F). The month is characterized by low precipitation, averaging only 6 mm (0.2 in) with zero rainy days, alongside a humidity level of 52%. In contrast, November sees cooler temperatures, with a minimum of 9°C (49°F) and an average of 17°C (62°F), peaking at 27°C (80°F). It also experiences increased rainfall, with 35 mm (1.4 in) of precipitation over an average of 2 days, and higher humidity at 66%. For more details, you can refer to Isla Cozumel weather in November.

September and December present contrasting weather experiences. In September, temperatures range from a minimum of 16°C (61°F) to a maximum of 30°C (86°F), with a pleasant average of 21°C (70°F) and minimal precipitation of just 6 mm (0.2 in) over zero rainy days, resulting in a comfortable humidity level of 52%. In stark contrast, December brings cooler temperatures, with lows of 8°C (46°F) and highs peaking at 23°C (73°F), averaging around 14°C (58°F). This month sees significantly more rainfall, totaling 68 mm (2.7 in) across 6 days, along with increased humidity at 74%. For more detailed information, you can check Isla Cozumel weather in December.

Compare Isla Cozumel's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Isla Cozumel

September in Isla Cozumel offers a delightful contrast to the peak summer months, featuring milder temperatures and notably low humidity levels. With an average of 21°C (70°F) and maximums reaching 30°C (86°F), this month provides a comfortable escape from the heat. Remarkably, rainfall is minimal with no recorded precipitation days, allowing visitors to revel in the stunning beaches and vibrant marine life without interruption. If you're planning a visit, September's pleasant weather is an inviting opportunity to explore the island's wonders. For more details, check out the comprehensive resource on Isla Cozumel Climate.