September Weather in San Miguel, Mexico

Last updated: April 22, 2025

September in San Miguel, Mexico is characterized by warm temperatures, with a maximum of 32°C (89°F) and an average of 24°C (75°F), dipping to a minimum of 19°C (66°F) at night. This month is notably wet, with a significant precipitation total of 425 mm (16.7 in) over 29 days, resulting in an average humidity of 83%. Visitors can expect a lush landscape complemented by warm days, but should prepare for frequent rain showers, making this an evocative time in this vibrant city.

September Temperature in San Miguel

In September, San Miguel de Allende experiences a delightful blend of warmth and mildness, with temperatures ranging from a comfortable 19°C (66°F) at night to a pleasant 32°C (89°F) during the day. This month marks a peak in the temperature profile, as the average settles at 24°C (75°F), making it one of the warmer months of the year. Following the summer months, September retains some residual warmth while also hinting at the cooler temperatures to come in the following months. The consistent warmth combined with lower nighttime temperatures creates an inviting atmosphere, perfect for enjoying the vibrant cultural scene or relaxing in the outdoors. As the month progresses, it gently paves the way for the refreshing coolness of autumn, making it an ideal time for visitors seeking to savor the last glimpses of summer warmth in this charming Mexican city.

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

The chart illustrates September temperature patterns in San Miguel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec686971727476767675757269
Data source: Temperature data for San Miguel 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 Miguel

September in San Miguel marks a significant culmination of the rainy season, delivering 425 mm (16.7 in) of precipitation over 29 days. The month stands out with rainfall amounts that rival those of August, though slightly lower. This trend showcases a sustained pattern of heavy rainfall from June to September, where July and August reached peaks of 311 mm (12.2 in) and 443 mm (17.4 in), respectively. As the wettest months approach their end, the intensity and frequency of precipitation gradually taper off, setting the stage for a drier October. The consistent rainfall during September not only nourishes the landscape but also highlights the region's transition from the vibrant, lush summer to the more moderate fall season.

September Precipitation Trends in San Miguel

The chart displays monthly precipitation patterns in San Miguel, 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.
JanFebMarAprMayJunJulAugSepOctNovDec202931142013114434252344619
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Miguel

In September, humidity levels in San Miguel, Mexico remain notably high at 83%, mirroring the trend established in the preceding months of July and August. This increase in humidity during the late summer months contrasts sharply with the cooler, drier conditions seen earlier in the year, peaking in March when humidity dipped to 59%. As autumn approaches, there is a slight decrease expected in October, but September’s moisture-laden air signifies the lingering warmth of summer, creating a humid ambience that can feel both vibrant and stifling. Overall, the data illustrates a pronounced seasonal shift, emphasizing the transition from dry to humid conditions as the year progresses.

September Average Humidity in San Miguel

This chart illustrates the average monthly humidity levels in San Miguel, 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.
JanFebMarAprMayJunJulAugSepOctNovDec70%65%59%60%67%80%81%83%83%80%77%76%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Miguel

In September, San Miguel, Mexico, experiences a consistent and intense UV Index of 13, categorized as extreme, with a rapid burn time of just 10 minutes. This trend follows a summer of heightened UV exposure, peaking in June with a UV Index of 14, and maintains the extreme classification through August and into October. With an increasingly urgent need for sun protection during these months, residents and visitors alike should be vigilant about their skin safety when outdoors. To better understand the potential risks and protective measures, explore more about the San Miguel UV Index.

Maximum UV Index Levels in San Miguel for September

The chart shows the monthly maximum UV Index (UVI) for San Miguel 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.
JanFebMarAprMayJunJulAugSepOctNovDec910131313141213131297
Data source: San Miguel 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 Miguel

As summer fades and autumn begins, September in San Miguel, Mexico is marked by a gentle transition in sunshine, delivering a delightful 242 hours of radiant daylight. Following a peak in brightness during the vibrant months of May and June, when the sun graces the city with over 340 hours of light, September reveals a subtle dip without sacrificing warmth. This month stands out with its balance, nestled comfortably between the lush greenery of summer and the crispness of fall, offering an ideal backdrop for leisurely strolls and outdoor adventures. With daylight hours gradually increasing again through October, September's golden glow creates a perfect moment to savor the lingering sunshine before the cooler months approach.

Monthly Sunshine Duration in San Miguel: September Highlighted

The September sunshine duration represents the total number of hours San Miguel 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.
JanFebMarAprMayJunJulAugSepOctNovDec231h264h321h326h344h291h293h263h242h269h279h284h
Data source: San Miguel September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Miguel During September

As the summer draws to a close, September in San Miguel, Mexico, sees a notable dip in sunny weather, with a meager 16% chance of sunshine. This marks a significant drop from the bright skies typically enjoyed earlier in the year, particularly in March, which boasts an impressive 82% chance of sun. Following the sun-drenched spring months, September transitions into a much cloudier phase, continuing a trend of diminishing sunshine that starts in June and persists through August. Visitors hoping to bask in the sun during this month may want to prepare for more overcast days, as the vibrant warmth of summer gives way to the cooler, less predictable autumn weather.

Percentage of Sunny Days in September in San Miguel

The chart illustrates the percentage of sunny days in San Miguel 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 Miguel experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec59%74%82%74%71%19%19%14%16%34%55%58%
Data source: San Miguel September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Miguel in September

As September arrives in San Miguel, daylight continues its steady decline from the peak summer months, offering about 12 hours of daylight. This mirrors August's daylight duration, signaling a transition as the days gradually shorten after the sunniest months of May through July, which boast 13 hours. The early part of the year sees a consistent 11 hours of daylight in January and February, with a slow increase as spring unfolds. By the time September rolls around, it’s clear that the vibrant days of summer are giving way to cozy autumn evenings, hinting at the impending shorter days of fall and winter.

Average Daylight Hours in San Miguel for September

The chart illustrates the variation in daylight duration in San Miguel throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 4m11h 29m12h 2m12h 35m13h 3m13h 17m13h 9m12h 44m12h 12m11h 39m11h 11m10h 57m
Data source: San Miguel daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in San Miguel

As summer transitions to autumn, September in San Miguel brings a gentle whisper of the wind, with average speeds dipping to 1.2 m/s (3 mph). This trend reflects a gradual decrease from the higher gusts experienced in earlier months, peaking in March and April at 1.7 m/s (4 mph). Throughout the warmer months, the winds were moderate, but as September unfolds, they soften, creating a serene atmosphere that invites locals and visitors alike to savor the beauty of the landscape. With the cooler temperatures beginning to set in, the calm breezes enhance the charm of this picturesque city, making it an ideal time for leisurely strolls and outdoor gatherings.

Average September Wind Speed in San Miguel

The chart displays monthly wind speed patterns in San Miguel, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.61.61.71.71.61.51.21.41.2 m/s1.31.41.5
Data source: San Miguel September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in San Miguel Compares to Other Months

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

September and January present contrasting weather conditions. In September, temperatures range from a minimum of 19°C (66°F) to a maximum of 32°C (89°F), with an average temperature of 24°C (75°F). This month experiences significant rainfall, with 425 mm (16.7 in) of precipitation over 29 days, leading to a high humidity level of 83%. In stark contrast, January has a much cooler climate, with temperatures ranging from a minimum of 5°C (42°F) to a maximum of 31°C (88°F), averaging 20°C (69°F). Additionally, it sees minimal precipitation, with only 20 mm (0.8 in) over just 2 days and a lower humidity of 70%. For more detailed information, you may refer to San Miguel weather in January.

In September, the weather is noticeably warmer and more humid, with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 32°C (89°F). This month experiences significant rainfall, with 425 mm (16.7 in) of precipitation over 29 days, leading to a humidity level of 83%. In contrast, February presents a cooler and drier climate, characterized by a minimum temperature of 7°C (45°F), an average of 21°C (69°F), and a maximum of 31°C (89°F). Rainfall is minimal in February, with only 29 mm (1.1 in) occurring over just 2 days, resulting in a lower humidity of 65%. For more details on February weather, visit San Miguel weather in February.

In comparing the weather between September and March, significant differences emerge. September experiences much warmer temperatures, with a minimum of 19°C (66°F) and an average of 24°C (75°F), while March starts cooler with minimums of 9°C (48°F) but has a similar maximum of 32°C (90°F). Precipitation levels are strikingly different; September sees about 425 mm (16.7 in) of rain over 29 days, contributing to high humidity levels at 83%. In contrast, March is remarkably dry, with only 3 mm (0.1 in) of precipitation over just 1 day, leading to a much lower humidity level of 59%. For more detailed insights about March weather, you can check San Miguel weather in March.

September and April present quite contrasting weather patterns. In September, temperatures range from a minimum of 19°C (66°F) to a maximum of 32°C (89°F), with an average of 24°C (75°F). This month is characterized by high humidity at 83% and significant rainfall, with 425 mm (16.7 in) of precipitation across 29 days. In stark contrast, April enjoys a milder climate, with minimum temperatures around 10°C (51°F) and a maximum similar to September at 32°C (91°F), but an overall average of 22°C (72°F). April's weather is notably drier, with only 1 mm (0.0 in) of precipitation and no rainy days, coupled with a lower humidity of 60%. For more details, you can check San Miguel weather in April.

When comparing the weather in September and May, a few distinct contrasts emerge. September tends to be warmer at night with minimum temperatures around 19°C (66°F), while May starts cooler with minimum temperatures dropping to 10°C (51°F). Both months share a similar average temperature of 24°C (75°F), but September experiences significantly higher maximum temperatures, reaching up to 32°C (89°F) compared to May's 33°C (91°F).

The most notable difference lies in precipitation: September is quite wet, receiving 425 mm (16.7 in) over 29 days, resulting in high humidity levels of 83%. In sharp contrast, May is relatively dry, with only 14 mm (0.6 in) of rainfall over just 2 days and a lower humidity of 67%. For more details on the weather patterns specific to May, check out San Miguel weather in May.

In comparing the weather of September and June, we find that September tends to be slightly warmer with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 32°C (89°F), while June has a similar range with temperatures from 17°C (63°F) to 33°C (92°F) and an average of 25°C (76°F). However, September is significantly wetter, receiving 425 mm (16.7 in) of precipitation over 29 days compared to June's 201 mm (7.9 in) over 20 days. Additionally, while September has a higher humidity level at 83%, June's humidity is still notable at 80%. For a more detailed look at June weather, you can refer to San Miguel weather in June.

In comparing the weather of September and July, we find that both months share similar average low temperatures, maintaining a minimum of 19°C (66°F). However, July typically features slightly higher average maximum temperatures, reaching up to 33°C (92°F), compared to September's 32°C (89°F). Notably, September experiences significantly more precipitation, with 425 mm (16.7 in) reported over 29 days, while July sees 311 mm (12.2 in) during the same number of days. Humidity levels are also similar, with September at 83% and July slightly lower at 81%. For more details on July's climate, you can check out San Miguel weather in July.

In comparing the weather of September and August, both months exhibit similar temperature ranges, with September featuring a minimum of 19°C (66°F), an average of 24°C (75°F), and a maximum of 32°C (89°F), closely aligning with August's figures of 19°C (66°F), an average of 24°C (76°F), and a maximum of 31°C (89°F). However, September is slightly wetter, receiving 425 mm (16.7 in) of precipitation over 29 days compared to August's 443 mm (17.4 in) over 31 days. Humidity levels remain consistent at 83% for both months, contributing to the overall tropical feel. For more insights on August's weather, you can check San Miguel weather in August.

In September, temperatures range from a minimum of 19°C (66°F) to a maximum of 32°C (89°F), with an average of 24°C (75°F). The month is characterized by high humidity at 83% and significant rainfall of 425 mm (16.7 in) spread over 29 days. In contrast, October sees a slight decrease in minimum temperature to 17°C (63°F) while the maximum temperature rises to 33°C (91°F), maintaining the same average of 24°C (75°F). Precipitation drops notably to 234 mm (9.2 in) over 24 days, and humidity decreases slightly to 80%. For a detailed look at October weather, you can check San Miguel weather in October.

In comparing the weather between September and November, it's evident that September is significantly warmer and wetter. With temperatures ranging from a minimum of 19°C (66°F) to a maximum of 32°C (89°F), September boasts an average temperature of 24°C (75°F) alongside high humidity levels of 83%. Additionally, the month sees substantial rainfall, with 425 mm (16.7 in) spread over 29 days.

In contrast, November experiences a drop in both temperature and precipitation. The temperatures range from a cooler minimum of 12°C (54°F) to a maximum that remains steady at 32°C (89°F), resulting in a more moderate average of 22°C (73°F). Rainfall is significantly lesser in November, totaling just 46 mm (1.8 in) over 8 days and accompanied by slightly lower humidity at 77%.

For a more detailed overview of November weather, you can check San Miguel weather in November.

In September, the weather is notably warmer with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 32°C (89°F). This month also experiences significant rainfall, with 425 mm (16.7 in) over 29 days, contributing to a high humidity level of 83%. In contrast, December brings a more mild climate, with minimum temperatures dropping to 8°C (47°F) and a comfortable average of 21°C (69°F), while max temperatures reach up to 31°C (88°F). The month is characterized by minimal precipitation of just 19 mm (0.7 in) over only 2 days and lower humidity at 76%. For more details on December weather in San Miguel, check out San Miguel weather in December.

Compare San Miguel's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in San Miguel

As September unfolds in San Miguel, the weather takes a distinct turn, characterized by a noticeable increase in humidity and frequent rainfall. While temperatures remain warm with average highs reaching 32°C, the high humidity level can make it feel hotter than it is. Unlike the drier months, September often sees up to 29 days of rain, bringing the total precipitation to a substantial 425 mm. This transitional month marks a shift from the more arid summer season, making it a unique time for visitors and locals alike. To dive deeper into how September's climate compares to the rest of the year, explore more in the San Miguel Climate section.