September Weather in San Andres, Mexico

Last updated: April 22, 2025

September in San Andres, Mexico offers a fascinating mix of weather conditions, making it a unique time to visit. With maximum temperatures reaching a warm 31°C (87°F), the days are pleasantly balmy, while the average temperature hovers around a comfortable 20°C (68°F). However, nighttime can bring a refreshing chill, with minimum temperatures dropping to 8°C (47°F). This month also sees 78 mm (3.1 in) of rainfall, occurring over 12 days, contributing to a relative humidity of 79% that can make the atmosphere feel lush and vibrant. Whether you're exploring the local scenery or relaxing on the beaches, September's weather offers a blend of warmth and occasional showers, enhancing the beauty of San Andres.

September Temperature in San Andres

In September, San Andres, Mexico experiences a pleasant transition as summer begins to wane. With minimum temperatures averaging around 8°C (47°F), and daytime highs peaking at 31°C (87°F), this month offers a comfortable blend of warmth and cooler evenings. The overall average temperature resides at a mild 20°C (68°F), making it an ideal time for outdoor activities and exploration. Notably, September marks a slight decrease in daytime temperatures compared to the peak of summer, signaling the approach of autumn while still retaining the essence of sunny days. As the month progresses, the refreshing evenings provide a perfect backdrop for enjoying the vibrant local culture and stunning landscapes that San Andres has to offer.

September Weather in San Andres: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Andres, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec475157647177737268635548
Data source: Temperature data for San Andres 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 San Andres

In September, San Andres experiences a notable shift in precipitation patterns, receiving 78 mm (3.1 in) of rain over 12 days. This substantial amount, while less than the preceding months of July and August, continues the trend of increased rainfall typical of the region's wet season. The steady downpour during this time not only sustains the lush greenery that characterizes the landscape but also supports local agriculture. With September being one of the tail ends of the heavy rains, the community anticipates the transition into the drier months ahead, where precipitation decreases significantly to around 33 mm (1.3 in) in October. This month serves as a reminder of both the beauty and the challenges of living in a climate marked by its seasonal variations.

September Precipitation Trends in San Andres

The chart displays monthly precipitation patterns in San Andres, 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.
JanFebMarAprMayJunJulAugSepOctNovDec85635311079378331615
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Andres

In September, San Andres, Mexico, experiences a noticeable uptick in humidity, rising to 79%—one of the highest levels of the year. This increase marks a return to more humid conditions following the comparatively drier months of April and May, which see humidity dip to 52% and 49%, respectively. As summer transitions into fall, the humidity levels remain elevated, with August closing the summer at 70%. The trend underscores a humid climate that gradually intensifies toward the end of the year, culminating in even higher humidity averages of 83% in November and 84% in December. This seasonal fluctuation highlights the tropical essence of San Andres, where moisture-laden air becomes a defining characteristic of the autumn months.

September Average Humidity in San Andres

This chart illustrates the average monthly humidity levels in San Andres, 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.
JanFebMarAprMayJunJulAugSepOctNovDec78%71%60%52%49%50%65%70%79%77%83%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Andres

In September, San Andres, Mexico, experiences a UV Index of 12, maintaining its status in the extreme exposure category with a burn time of just 10 minutes. This slight dip from the peak of 14 in May and 13 in the summer months does little to diminish the intensity of the sun's rays. As summer transitions to fall, sun safety remains crucial: travelers and locals alike should continue to take precautions to protect their skin. With high UV levels persisting throughout the year, knowledge is key to enjoying the bright, sunny days in this beautiful coastal region. For more detailed information, check out San Andres UV Index.

Maximum UV Index Levels in San Andres for September

The chart shows the monthly maximum UV Index (UVI) for San Andres 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.
JanFebMarAprMayJunJulAugSepOctNovDec69111314131313121086
Data source: San Andres 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 San Andres

As September arrives in San Andres, Mexico, the sun continues to shine brightly, offering 295 hours of delightful sunshine. While this marks a slight decline from the peak summer months of May through August, which basked in more than 330 hours of sun, it still stands strong amidst the yearly averages. The trend showcases the vibrant energy of the region, where sunlight gradually decreases as the year moves into autumn, reflecting the stunning transitions in nature. With September's inviting warmth and an ample dose of sunshine, it's the perfect time to soak in the beauty of this coastal paradise.

Monthly Sunshine Duration in San Andres: September Highlighted

The September sunshine duration represents the total number of hours San Andres 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.
JanFebMarAprMayJunJulAugSepOctNovDec221h260h304h326h365h351h349h336h295h291h263h265h
Data source: San Andres September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Andres During September

In September, San Andres, Mexico, enjoys a 61% chance of sunny weather, making it a pleasant time to visit as summer wanes. This month marks a notable improvement compared to the preceding months of July and August, which experience lower probabilities of sunshine at 56% and 47%, respectively. As autumn approaches, the likelihood of clear skies begins to rise once again, hinting at the brighter months ahead, particularly in October, where the chance of sun jumps to an impressive 79%. This trend showcases San Andres as a favorable destination for sun-seekers looking to escape the late summer gloom.

Percentage of Sunny Days in September in San Andres

The chart illustrates the percentage of sunny days in San Andres 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 San Andres experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec77%64%77%67%77%60%56%47%61%79%65%50%
Data source: San Andres September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Andres in September

In San Andres, Mexico, the daylight duration experiences a gentle ebb and flow throughout the year, creating a rhythm that beckons both locals and visitors alike. In September, daylight settles at 12 hours, reminiscent of the longer days seen in the spring and early summer months. This slight decline from the peak of 13 hours in the summer underscores the transition into autumn, with daylight gradually tapering off into 11 hours by October. The gradual rise from 10 hours in January to 13 hours in the summer months highlights a significant increase in brightness and warmth as the year progresses. As this cycle unfolds, visitors in September can bask in the lush surroundings of San Andres, enjoying the balance of daylight that perfectly complements the serene ambiance of the region.

Average Daylight Hours in San Andres for September

The chart illustrates the variation in daylight duration in San Andres throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 32m11h 11m12h12h 51m13h 34m13h 55m13h 43m13h 5m12h 17m11h 26m10h 42m10h 20m
Data source: San Andres daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in San Andres

As September rolls into San Andres, Mexico, the average wind speed gently settles at 2.3 m/s (5 mph), a slight dip from the summer months. This period marks a transition, with the winds calming down after the balmy breezes of July and August, which lingered around 2.2-2.1 m/s. Interestingly, the prevailing conditions in September, while relaxed, maintain a charming feel of warmth in the air, setting the stage for the upcoming autumn. Notably, as the year progresses, wind speeds begin to pick up again in October, hinting at the dynamic interplay of seasonal changes. Thus, September offers a tranquil pause, inviting visitors to relish the soothing embrace of San Andres' coastal ambiance.

Average September Wind Speed in San Andres

The chart displays monthly wind speed patterns in San Andres, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.93.64.23.73.43.12.22.12.3 m/s2.92.33.0
Data source: San Andres September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in San Andres Compares to Other Months

The weather in San Andres 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 San Andres and find detailed weather information for every month.

September typically offers a warm and variable climate, with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 31°C (87°F) and an average of 20°C (68°F). With 78 mm (3.1 in) of precipitation over about 12 days, the humidity levels are relatively high at 79%, creating a lush atmosphere. In contrast, January brings significantly colder temperatures, featuring a minimum of -6°C (21°F), an average of 8°C (47°F), and a maximum of 24°C (76°F). Precipitation drops sharply to just 8 mm (0.3 in) over 2 days, with humidity at a similar level of 78%. The stark difference between the two months highlights September's warmth and wetter conditions compared to January's chill and relative dryness. For a closer look at January weather specifics, you can visit San Andres weather in January.

September and February present contrasting weather experiences. In September, temperatures range from a mild 8°C (47°F) at night to a warm 31°C (87°F) during the day, with an average of 20°C (68°F). This month also sees significant rainfall, totaling 78 mm (3.1 in) over about 12 days, accompanied by relatively high humidity levels at 79%. In sharp contrast, February offers a cooler climate, with temperatures dipping to a minimum of -7°C (20°F) and peaking at 28°C (83°F), averaging around 11°C (51°F). Notably, February experiences very little precipitation, with just 4 mm (0.2 in) falling over a mere 1 day, while humidity levels are slightly lower at 71%. For a detailed look at February weather, visit San Andres weather in February.

When comparing the weather in September and March, distinct differences emerge. September boasts a warmer average temperature of 20°C (68°F), with daily highs reaching up to 31°C (87°F), making it a more comfortable month for outdoor activities. In contrast, March presents a cooler climate, with average temperatures around 14°C (58°F) and lows dipping to -3°C (26°F). Precipitation in September is considerably higher, with 78 mm recorded over 12 days, while March sees only 6 mm over just 2 days. Additionally, September experiences higher humidity at 79%, compared to March's more moderate 60%. For more details, you can check San Andres weather in March.

In comparing the weather of September and April, it's clear that both months can experience warm temperatures, with maximums reaching up to 31°C (88°F). However, September tends to be significantly warmer overall, with an average temperature of 20°C (68°F) compared to April's 18°C (65°F). Additionally, September experiences higher humidity at 79% and more precipitation, averaging 78 mm over 12 days, while April is much drier, with just 3 mm of rain in a single day and lower humidity at 52%. For more details on conditions in April, you can check out San Andres weather in April.

When comparing the weather in September and May, notable differences emerge. September typically experiences a wider range of temperatures, with minimums of 8°C (47°F) and maximums reaching up to 31°C (87°F), averaging around 20°C (68°F). In contrast, May's temperatures are generally warmer, with minimums of 5°C (40°F) and maximums soaring to 35°C (95°F), resulting in an average of 22°C (72°F). Additionally, September tends to be wetter, receiving about 78 mm (3.1 in) of rainfall over 12 days, while May is much drier, with only 5 mm (0.2 in) of precipitation occurring on just 1 day. Furthermore, humidity levels are higher in September at 79%, compared to the more comfortable 49% in May. For a closer look at May weather specifics, you can check out San Andres weather in May.

When comparing the weather in September to that in June, notable differences emerge. September experiences a broader temperature range, with minimums dipping to 8°C (47°F) and maximums reaching up to 31°C (87°F), while June boasts warmer averages, starting at a minimum of 11°C (52°F) and soaring to a maximum of 37°C (98°F). Additionally, September sees significantly higher precipitation with 78 mm (3.1 in) over 12 days, contrasted with June's much lighter rainfall of just 31 mm (1.2 in) over only 4 days. Humidity levels in September are also higher at 79%, compared to a drier 50% in June, making September feel considerably more humid. For a detailed look at June weather, you can check San Andres weather in June.

September offers a cooler climate compared to July, with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 31°C (87°F), while July experiences warmer temperatures ranging from 14°C (57°F) to a maximum of 35°C (95°F). Additionally, September sees slightly less precipitation with 78 mm (3.1 in) over 12 days, compared to July's 107 mm (4.2 in) over 14 days. Humidity levels are also higher in September at 79%, whereas July boasts a lower humidity level of 65%. For more specific insights on July weather, check out San Andres weather in July.

When comparing the weather in September to that of August, September features slightly cooler temperatures, with a minimum of 8°C (47°F) and an average of 20°C (68°F), while August boasts a minimum of 10°C (50°F) and an average of 22°C (72°F). August also sees higher maximum temperatures, reaching up to 33°C (92°F) compared to September's peak of 31°C (87°F). In terms of precipitation, September receives 78 mm (3.1 in) over 12 days, which is somewhat less than August's 93 mm (3.7 in) over 13 days. Additionally, September has higher humidity levels at 79%, compared to August’s 70%. For more details on August conditions, visit San Andres weather in August.

September and October present a notable shift in weather patterns. September boasts a warm average temperature of 20°C (68°F), with highs reaching up to 31°C (87°F), alongside 12 days of precipitation totaling 78 mm (3.1 in) and a humidity level of 79%. In contrast, October experiences cooler temperatures with an average of 17°C (63°F) and a minimum dipping to -2°C (28°F). The month is characterized by lower precipitation at 33 mm (1.3 in) over just 6 days, along with slightly reduced humidity at 77%. For a detailed look at weather specifics, check out San Andres weather in October.

September weather features a more temperate climate with average temperatures ranging from a minimum of 8°C (47°F) to a maximum of 31°C (87°F), making it a warmer month overall with an average of 20°C (68°F). The humidity is moderately high at 79% and there is considerable precipitation, totaling 78 mm (3.1 in) across about 12 days. In contrast, November brings a notable drop in temperatures, with minimums reaching as low as -5°C (23°F) and an average daytime temperature of 13°C (56°F), warming up to a maximum of 27°C (81°F). Additionally, November experiences much less precipitation, totaling only 16 mm (0.6 in) over just 2 days, while humidity remains slightly elevated at 83%. For more information on November weather specifics, you can check San Andres weather in November.

September and December present strikingly different weather patterns. In September, temperatures range from a minimum of 8°C (47°F) to a maximum of 31°C (87°F), with an average of 20°C (68°F). This month also experiences considerable precipitation of 78 mm (3.1 in) over 12 days, contributing to a humidity level of 79%. In contrast, December sees a significant drop in temperature, with minimums plummeting to -7°C (19°F) and maximums reaching only 24°C (75°F), leading to an average of 9°C (48°F). Precipitation is much lower at 14 mm (0.6 in) over just 2 days, while humidity slightly increases to 84%. For more specific insights into December weather, check out San Andres weather in December.

Compare San Andres's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in San Andres

In September, San Andres experiences a distinctive shift in weather, marked by higher humidity levels and an increase in precipitation compared to the preceding months. While temperatures remain pleasantly warm, often peaking at around 31°C, the average feels cooler due to the increase in rain, contributing to a lush, vibrant landscape. With approximately 12 days of rain, September stands out as a wetter month, adding a refreshing contrast to the typically dry and hot summer. For a comprehensive look at how September weather patterns compare within the region, visit San Andres Climate.