September Weather in Cancun, Mexico

Last updated: April 22, 2025

In September, Cancún, Mexico greets visitors with warm temperatures, featuring an impressive maximum of 30°C (86°F) and a comforting average of 28°C (83°F), while nighttime lows settle around 25°C (77°F). However, the month is characterized by increased precipitation, with 117 mm (4.6 inches) of rain falling over approximately 19 days, contributing to a humidity level of 76%. Travelers should come prepared for occasional showers, yet can still enjoy the vibrant atmosphere of this tropical paradise.

September Temperature in Cancun

In September, Cancun's temperatures reflect the peak of its tropical climate, with minimums averaging around 25°C (77°F) and highs reaching a warm 30°C (86°F). This month shares a lot in common with the preceding summer months, as the average temperature remains stable at 28°C (83°F). As the rainy season progresses, you'll find greater humidity, but the allure of sun-kissed beaches and vibrant nightlife remains undeterred. September's warm waters and balmy evenings offer a perfect backdrop for relaxation and adventure, making it an inviting time for travelers to explore the stunning beauty of Cancun while enjoying its tropical warmth.

September Weather in Cancun: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Cancun, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec767778798182838382817978
Data source: Temperature data for Cancun generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Cancun

September in Cancun marks a pivotal transition in the rainy season, showcasing a significant uptick in precipitation with an average of 117 mm (4.6 in) over 19 days. This month typically sees more rainfall than its summer predecessors, contributing to the lush landscapes that characterize the region. While May and June boast their own substantial totals of 118 mm (4.6 in) and 166 mm (6.5 in) respectively, it's September's consistent daily downpours that underscore the onset of the wettest stretch of the year, as October soon follows with an even higher average of 214 mm (8.4 in). This pattern reveals not only an increase in precipitation but also hints at the dynamic climate of Cancun, where each month leads to a rich tapestry of vibrant greenery nourished by the tropical rains.

September Precipitation Trends in Cancun

The chart displays monthly precipitation patterns in Cancun, 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.
JanFebMarAprMayJunJulAugSepOctNovDec623021341181664410011721411873
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cancun

September in Cancun, Mexico, showcases a steady humidity level of 76%, consistent with the preceding months of June through August. This slight yet consistent humidity creates a tropical atmosphere, perfect for beach-goers seeking sun and fun. As summer transitions into fall, visitors can expect comfortable conditions, much like the preceding months, but without the peak summer heat. Interestingly, the humidity begins to rise again as the year progresses, peaking at 80% in December, bringing a lush vibrancy to the region. Overall, September offers a delightful balance of warmth and moisture, making it an appealing time to experience the charm of Cancun.

September Average Humidity in Cancun

This chart illustrates the average monthly humidity levels in Cancun, 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.
JanFebMarAprMayJunJulAugSepOctNovDec79%78%76%76%75%76%76%76%76%76%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cancun

In September, visitors to Cancun, Mexico, can expect a UV Index of 12, categorized as extreme, indicating significant potential for skin damage with just 10 minutes of exposure. This month continues the trend established over the summer, where UV levels remained high, peaking at similar values throughout June, July, and August. It's essential to stay vigilant during this time, as the consistent intensity of UV radiation signals a clear need for sun protection. As you enjoy Cancun's beautiful beaches, don’t forget to check the latest updates on the Cancun UV Index to keep your skin safe while soaking up the sun!

Maximum UV Index Levels in Cancun for September

The chart shows the monthly maximum UV Index (UVI) for Cancun 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.
JanFebMarAprMayJunJulAugSepOctNovDec810121313131212121187
Data source: Cancun 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 Cancun

September in Cancun, Mexico, embraces delightful sunshine, amassing an impressive 317 hours of bright, warm days. As summer fades, the sunshine hours start to gently decline from July's peak of 346 hours, signaling a gradual transition into the milder embrace of autumn. This month showcases a wonderful balance—still basking in ample daylight while hinting at the approaching cooler months. With just a slight dip compared to the vibrant summer, September offers a perfect opportunity for beach lovers and sunseekers to enjoy Mexico’s tropical allure before the fall sets in. So, whether you're lounging on the sandy shores or exploring lush landscapes, September delivers a captivating blend of warmth and charm.

Monthly Sunshine Duration in Cancun: September Highlighted

The September sunshine duration represents the total number of hours Cancun 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.
JanFebMarAprMayJunJulAugSepOctNovDec232h283h324h329h345h306h346h333h317h302h297h295h
Data source: Cancun September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Cancun During September

In Cancun, Mexico, the likelihood of sunny weather undergoes notable shifts throughout the year, with September marking a dip in the sunshine stakes at just 33%. After the vibrant and mostly sunny summer months, the weather begins to shift, leading into fall. This decline in sunny days is evident when compared to peak sunshine months like March and July, which boast probabilities of 70% and 60%, respectively. Although vacationers may encounter a bit more cloud cover and variability in September, the overall climate remains warm, making it still a viable time to enjoy Cancun's pristine beaches and attractions, even if the promise of bright sunshine isn't as strong as in earlier months.

Percentage of Sunny Days in September in Cancun

The chart illustrates the percentage of sunny days in Cancun 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 Cancun experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec39%66%70%62%55%29%60%52%33%52%49%62%
Data source: Cancun September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Cancun in September

As September unfolds in Cancun, Mexico, daylight graces the region for a generous 12 hours each day, marking a slight dip from the peak summer months of June through August, when sunshine lingered for a full 13 hours. This transition signals the gradual approach of fall, as daylight durations start to mirror those of the earlier months of the year, specifically aligning with the light levels seen in March and April. Visitors can relish long, sun-soaked days perfect for exploring the stunning beaches or vibrant local culture, while also noticing that the warmth of summer lingers in the inviting atmosphere of this tropical paradise.

Average Daylight Hours in Cancun for September

The chart illustrates the variation in daylight duration in Cancun throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 59m11h 26m12h 1m12h 38m13h 8m13h 23m13h 15m12h 48m12h 13m11h 37m11h 6m10h 51m
Data source: Cancun daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Cancun

In September, the winds in Cancun, Mexico tend to calm, with average speeds dropping to 5.0 m/s (11 mph), the lowest of the year. This month marks the transition from the summer heat, as wind speeds begin a gradual decline that continues into the fall. Prior to September, the gusts held steady around 6.2 m/s to 7.0 m/s from January to April, providing a refreshing breeze for beachgoers. However, the shift toward milder winds signifies a shift in the atmosphere, creating a more serene setting perfect for relaxation. As the winds soften, Cancun transforms into a tranquil paradise, inviting visitors to soak up the beauty of its stunning beaches under the gentle sway of the breeze.

Average September Wind Speed in Cancun

The chart displays monthly wind speed patterns in Cancun, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6.26.96.87.06.66.25.15.65.0 m/s4.65.46.1
Data source: Cancun September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Cancun Compares to Other Months

The weather in Cancun 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 Cancun and find detailed weather information for every month.

September weather in Cancun is characterized by warmer temperatures, with a minimum of 25°C (77°F) and an average of 28°C (83°F), reaching a maximum of 30°C (86°F). This month is also marked by higher precipitation, averaging 117 mm (4.6 in) over 19 rainy days, combined with a humidity level of 76%.

In contrast, January sees milder conditions, with temperatures ranging from a minimum of 20°C (69°F) to an average of 24°C (76°F) and a maximum of 28°C (82°F). Rainfall is significantly lower during this month, with 62 mm (2.4 in) spread over just 12 days, while humidity remains fairly high at 79%.

For more detailed insights on January's weather, you can visit Cancun weather in January.

In September, the weather is characterized by warmer temperatures, with minimums around 25°C (77°F) and daytime averages of 28°C (83°F), peaking at 30°C (86°F). This month also sees significant rainfall, totaling 117 mm (4.6 in) over approximately 19 days, and a humidity level of 76%. In contrast, February offers milder conditions, with temperatures ranging from a minimum of 21°C (70°F) to an average of 25°C (78°F) and a maximum of 27°C (81°F). The precipitation in February is considerably lower at 30 mm (1.2 in) across about 10 days, accompanied by a slightly higher humidity of 78%. For a detailed look at February's climate, check out Cancun weather in February.

September and March present distinct weather profiles. September typically sees warmer temperatures, with a minimum of 25°C (77°F) and an average of 28°C (83°F), peaking at 30°C (86°F). In contrast, March has cooler temperatures, ranging from a minimum of 21°C (70°F) to an average of 25°C (78°F), and a maximum of 27°C (82°F). Additionally, September experiences significantly higher precipitation, with 117 mm (4.6 in) over 19 days, compared to March's modest 21 mm (0.8 in) across just 5 days. Both months share a humidity level of 76%, creating a consistently warm and humid atmosphere in the region. For more detailed insights, you can explore Cancun weather in March.

In comparing the weather of September and April, September tends to be warmer, with average temperatures around 28°C (83°F) and maximums reaching 30°C (86°F). In contrast, April has slightly cooler temperatures, averaging 26°C (79°F) and peaking at 28°C (83°F). Another significant difference is precipitation; September experiences much heavier rainfall, totaling 117 mm (4.6 in) over 19 days, while April sees a mere 34 mm (1.3 in) across only 5 days. Both months share similar humidity levels at 76%. For more detailed insights, visit Cancun weather in April.

When comparing the weather in September and May, both months exhibit warm temperatures, with September having slightly higher averages, showcasing a minimum of 25°C (77°F) and an average of 28°C (83°F). In contrast, May offers a slightly cooler range, with a minimum of 24°C (75°F) and an average of 27°C (81°F). Precipitation levels are similar, with September receiving 117 mm (4.6 in) over 19 days, while May records 118 mm (4.6 in) across 16 days, making both months relatively wet. Additionally, humidity remains high in both months, with September at 76% and May slightly lower at 75%. For more detailed insights into May weather, you can refer to this link: Cancun weather in May.

When comparing the weather in September and June, both months share similar temperature ranges, with minimums around 25°C (77°F) and averages hovering between 28°C (82-83°F). However, September generally experiences slightly warmer maximum temperatures, reaching up to 30°C (86°F), compared to June's maximum of 29°C (85°F). Precipitation is notably higher in June, with 166 mm (6.5 in) occurring over 18 days, while September sees 117 mm (4.6 in) of rain over 19 days. Despite these differences in rainfall, both months maintain a consistent humidity level of 76%. For more detailed information, you can check Cancun weather in June.

In comparing the weather in September and July, both months share similar average temperatures, with a minimum of 25°C and an average of 28°C. However, September tends to be slightly warmer, with a maximum of 30°C compared to July's 29°C. One notable difference is precipitation; September experiences significantly more rainfall, averaging 117 mm over 19 days, while July sees only 44 mm over 10 days. Both months maintain a humidity level of 76%, ensuring a consistently warm and humid atmosphere. For further details on July's climate specifics, you can check out Cancun weather in July.

In comparing the weather between August and September, both months experience similar average temperatures, with September showing a slight decrease in the minimum temperature at 25°C (77°F) compared to August's 26°C (79°F). While the maximum temperatures remain consistent at 30°C (86°F) for both months, September experiences more rainfall, with 117 mm (4.6 in) over 19 days, compared to August's 100 mm (3.9 in) over 14 days. Interestingly, humidity levels remain steady at 76% for both months, indicating a consistently tropical climate. For a more detailed look at August's conditions, you can check out Cancun weather in August.

September and October in Cancun showcase a gradual shift in weather patterns. In September, temperatures are slightly higher on average, with a minimum temperature of 25°C (77°F) and an average of 28°C (83°F), while October experiences a slight drop, with averages of 24°C (76°F) and 27°C (82°F). However, October sees an increase in precipitation, with 214 mm (8.4 in) falling over 23 days compared to September's 117 mm (4.6 in) over 19 days. Humidity remains consistent at 76% for both months, contributing to the tropical feel. For more detailed insights, check out Cancun weather in October.

In September, the weather tends to be warmer with average temperatures reaching around 28°C (83°F) and maximums peaking at 30°C (86°F). This month also sees considerable rainfall, averaging 117 mm (4.6 in) over 19 days with humidity levels at 76%. In contrast, November brings slightly cooler temperatures, with averages of 26°C (79°F) and maximums of 29°C (84°F). Precipitation remains similar at 118 mm (4.7 in) but occurs over fewer days, just 16. Additionally, humidity increases slightly to 78%. For more detailed information, you can check Cancun weather in November.

In September, Cancun experiences warmer temperatures with a minimum of 25°C (77°F) and an average of 28°C (83°F), peaking at 30°C (86°F). The month is characterized by higher precipitation, averaging 117 mm (4.6 in) over 19 days, and a humidity level of 76%. In contrast, December brings slightly cooler temperatures, with a minimum of 21°C (71°F) and an average of 25°C (78°F), reaching a maximum of 28°C (83°F). The rainfall decreases significantly to 73 mm (2.9 in) spread over just 13 days, while humidity rises to 80%. For more detailed insights on the December climate, check out Cancun weather in December.

Compare Cancun's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Cancun

As summer transitions to autumn, September in Cancun brings warm temperatures that typically hover around 28°C (83°F), offering a comfortable climate for visitors. However, it's the notable increase in humidity and the likelihood of precipitation that sets this month apart, with nearly two-thirds of the month experiencing some rainfall. While you can still enjoy the sunny days, it's wise to prepare for the occasional downpour that accompanies the tropical air. Compared to the hotter and drier preceding months, September is a unique blend of warmth and tropical showers, making it an interesting time to explore Cancun's vibrant culture. For a deeper understanding of what to expect throughout the year, check out the complete guide on Cancun Climate.