September Weather in Atotonilco, Mexico

Last updated: April 22, 2025

September in Atotonilco, Mexico, offers a dynamic weather experience characterized by a maximum temperature soaring to 39°C (102°F), while the average settles comfortably at 30°C (86°F). The month brings some relief with a minimum temperature of 22°C (72°F) during the cooler nights. Rainfall is a notable feature, with precipitation totaling 103 mm (4.0 in) over 11 days, helping to elevate the humidity level to an average of 76%. This combination of heat and moisture sets the stage for a vibrant, lush environment, making September a unique yet challenging time for residents and visitors alike.

September Temperature in Atotonilco

In September, Atotonilco, Mexico experiences a significant shift towards warmer temperatures, marking the tail end of summer. With a minimum temperature of 22°C (72°F) and an average of 30°C (86°F), the days can feel particularly hot, especially as the month peaks with a maximum of 39°C (102°F). This increase continues a trend seen throughout the warmer months, where temperatures escalate steadily from the cooler January averages. As the heat lingers, the comfortable evenings offer a welcome respite, yet the overall climate remains vibrant and inviting, perfect for those looking to enjoy the sun before the cooler autumn months arrive.

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

The chart illustrates September temperature patterns in Atotonilco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec646467737885888886827366
Data source: Temperature data for Atotonilco 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 Atotonilco

In September, Atotonilco experiences a significant uptick in precipitation, with average rainfall soaring to 103 mm (4.0 in) over 11 days. This marks the peak of the rainy season, contrasting sharply with the preceding months where rainfall was sparse and largely nonexistent. Following a gradual increase from 30 mm (1.2 in) in July and a robust 64 mm (2.5 in) in August, the rain in September represents not only the heaviest downpour of the year but also a crucial replenishment for the region's ecosystem. As the dry months draw closer, this surge of moisture serves as a vital lifeline, creating a lush landscape and supporting local agriculture before the onset of the drier autumn.

September Precipitation Trends in Atotonilco

The chart displays monthly precipitation patterns in Atotonilco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec971000103064103221712
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Atotonilco

In Atotonilco, Mexico, September ushers in a notable increase in humidity, measuring 76%. This rise continues the trend from the preceding months, where humidity levels fluctuate significantly throughout the year. Notably, the summer months of July and August see heightened humidity, peaking at 73% in August. Following this pattern, September stands out as the most humid month of the year, hinting at the lingering effects of the rainy season. As autumn approaches, humidity levels gradually decline into October, settling back to a more moderate 72%. This seasonal ebb and flow not only shapes the local climate but also contributes to the vibrant atmosphere of Atotonilco during this time.

September Average Humidity in Atotonilco

This chart illustrates the average monthly humidity levels in Atotonilco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec71%66%59%52%51%51%61%73%76%72%72%72%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Atotonilco

In September, Atotonilco, Mexico, experiences a UV Index of 11, categorizing it as extreme and requiring only 10 minutes for skin to begin burning. This marks a slight decrease from the peak summer months, where the UV Index reached 12, but remains significantly high. As the dry season transitions into fall, residents and visitors should remain vigilant about sun exposure, especially since the UV levels closely follow the trends established in the preceding months. It's crucial to protect your skin, as conditions remain intense even with a minor dip. For more detailed insights on UV levels throughout the year, check out the Atotonilco UV Index.

Maximum UV Index Levels in Atotonilco for September

The chart shows the monthly maximum UV Index (UVI) for Atotonilco 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.
JanFebMarAprMayJunJulAugSepOctNovDec6810121212111211975
Data source: Atotonilco 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 Atotonilco

As the summer heat begins to mellow, September in Atotonilco, Mexico presents a delightful transition marked by an impressive 302 hours of sunshine. This month continues a trend of abundant sunlight, following the peak brightness of May and June, which boasted 364 and 359 hours, respectively. The days gradually shorten as autumn approaches, yet September retains a generous supply of radiant sunshine, significantly more than the falling figures of winter months like November and December, with only 264 and 262 hours. This vibrant autumnal glow invites both locals and travelers to bask in the rich hues of the landscape under the warm, golden rays, making it a perfect time to explore the region's natural beauty.

Monthly Sunshine Duration in Atotonilco: September Highlighted

The September sunshine duration represents the total number of hours Atotonilco 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.
JanFebMarAprMayJunJulAugSepOctNovDec218h253h296h327h364h359h348h329h302h303h264h262h
Data source: Atotonilco September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Atotonilco During September

As summer wanes, September in Atotonilco, Mexico, presents a modest 61% chance of sunny weather. This marks a notable drop from the sun-drenched months of May and June, which boast probabilities of 79% and 76%, respectively. However, September still offers more sunny days compared to the subsequent months of October and November, where clear skies are likely 88% and 69% of the time. Overall, while September might not be the sunniest month, it remains a favorable time to enjoy the warm climate before the dry season fully sets in.

Percentage of Sunny Days in September in Atotonilco

The chart illustrates the percentage of sunny days in Atotonilco 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 Atotonilco experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec71%63%69%72%79%76%44%52%61%88%69%51%
Data source: Atotonilco September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Atotonilco in September

In Atotonilco, Mexico, the journey through the year reveals fascinating patterns in daylight duration, particularly as we transition into September. After enjoying 13 hours of daylight during the vibrant summer months of June, July, and August, the shift to September brings a slight decrease to 12 hours. This marks a gentle tapering as the region begins to prepare for autumn, echoing the gradual decline seen in earlier months. Notably, daylight hours increase from 10 hours in January up to a peak in late summer, creating a rhythmic cadence of light and dark that enhances the area's seasonal beauty. As the days grow shorter again, the cycle hints at nature's inevitable change, setting the stage for the cozy months ahead.

Average Daylight Hours in Atotonilco for September

The chart illustrates the variation in daylight duration in Atotonilco throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 37m11h 13m12h 1m12h 49m13h 29m13h 49m13h 38m13h 2m12h 16m11h 28m10h 46m10h 26m
Data source: Atotonilco daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Atotonilco

As September unfolds in Atotonilco, Mexico, the winds begin to soften, with an average speed of 2.9 m/s (6 mph) marking the month as one of the calmest of the year. Following the slightly stronger gusts of the summer, September's breezes continue the gradual decline begun in August. This month stands out not only for its gentle winds but also for the transition it heralds towards cooler autumn temperatures. With a noticeable dip in wind speed, September invites a slower pace, encouraging an intimate connection with the vibrant landscapes and serene surroundings that define this charming locale. As the air settles, the beauty of Atotonilco emerges in new light, making it a magical time for both locals and visitors.

Average September Wind Speed in Atotonilco

The chart displays monthly wind speed patterns in Atotonilco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.63.44.13.83.44.13.53.22.9 m/s3.52.73.3
Data source: Atotonilco September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Atotonilco Compares to Other Months

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

In September, the weather is characterized by warm to hot temperatures, with daily highs averaging around 30°C (86°F) and occasionally reaching as high as 39°C (102°F). This month also brings significant rainfall, averaging 103 mm (4.0 in) over about 11 days, along with high humidity levels at 76%. In contrast, January offers a much cooler climate, with temperatures ranging from a minimum of 8°C (46°F) to a comfortable average of 18°C (64°F), peaking at 27°C (82°F). Additionally, January is notably drier, with only 9 mm (0.4 in) of precipitation spread across just 1 day, and a slightly lower humidity of 71%. For a detailed look at January conditions, visit Atotonilco weather in January.

When comparing the weather in September and February, a stark contrast emerges. September experiences warmer temperatures, with a minimum of 22°C (72°F) and an average high of 30°C (86°F), peaking at a scorching 39°C (102°F). This month also sees significant rainfall, totaling 103 mm (4.0 in) over 11 days, accompanied by high humidity at 76%. In contrast, February boasts much cooler conditions, where temperatures range from a minimum of 8°C (46°F) to an average of 18°C (65°F), with a maximum of 28°C (82°F). Precipitation is minimal, at just 7 mm (0.3 in) over a single day, and humidity drops to 66%. For more detailed information on February weather, visit Atotonilco weather in February.

September weather is characterized by warm to hot temperatures, with daily highs averaging around 30°C (86°F) and peak temperatures reaching as high as 39°C (102°F). This month also sees considerable humidity at 76% and significant rainfall, accumulating to 103 mm (4.0 in) over approximately 11 days. In contrast, March presents a much cooler climate, where average temperatures hover around 20°C (67°F), with highs peaking at 30°C (86°F) and lows dropping to 9°C (49°F). The precipitation levels are drastically lower in March, with only 10 mm (0.4 in) falling over just 1 day, and humidity sitting at a more comfortable 58%. For a detailed look at March conditions, visit Atotonilco weather in March.

When comparing the weather in September and April, a stark contrast emerges. September often shows much warmer conditions, with minimum temperatures averaging around 22°C (72°F) and peaking at 39°C (102°F), while April tends to be cooler, featuring a minimum of 14°C (57°F) and a maximum of 33°C (91°F). September is also characterized by higher humidity at 76% and significant rainfall of 103 mm (4.0 in) over 11 days, whereas April remains dry with no recorded precipitation and a lower humidity level of 52%. For those interested in more detailed weather information, you can visit Atotonilco weather in April.

When comparing the weather in September and May, significant differences emerge. September tends to be much hotter, with average temperatures reaching 30°C (86°F) and maximums soaring to 39°C (102°F). In contrast, May offers a milder climate with average temperatures around 26°C (78°F) and maximums peaking at 35°C (96°F). Additionally, September experiences considerable precipitation, averaging 103 mm (4.0 in) over 11 days and contributing to a high humidity level of 76%. Meanwhile, May enjoys a dry spell with no recorded precipitation or rainy days, resulting in a more comfortable humidity level of 51%. For a detailed overview, you can check out Atotonilco weather in May.

In comparing the weather of September and June, September tends to be hotter with average temperatures peaking at 30°C (86°F) and reaching highs of up to 39°C (102°F), while June has a slightly lower average temperature of 29°C (85°F) and maximums of 37°C (100°F). Notably, September experiences significantly more precipitation, with 103 mm (4.0 in) spread over 11 days, contrasting sharply with June's virtually dry conditions of only 10 mm (0.4 in) and no rainy days. Furthermore, humidity levels are higher in September at 76%, compared to June's more comfortable 51%. For more detailed information, you can check Atotonilco weather in June.

The weather in September and July shows notable differences in temperature and precipitation. In September, temperatures range from a minimum of 22°C (72°F) to a maximum of 39°C (102°F), averaging around 30°C (86°F), while July is slightly warmer with a minimum of 26°C (78°F) and a maximum of 38°C (100°F), averaging 31°C (88°F). September also experiences significantly higher rainfall, totaling 103 mm (4.0 in) over 11 days, compared to July's 30 mm (1.2 in) across just 6 days. Additionally, September’s higher humidity at 76% contributes to a more muggy atmosphere than July’s 60%. For more detailed information, you can refer to Atotonilco weather in July.

September generally presents a hot and humid climate, with average temperatures slightly dropping compared to August. While September has a minimum temperature of 22°C (72°F) and an average of 30°C (86°F), August sees higher minimums and an average of 31°C (89°F). The maximum temperature in September reaches 39°C (102°F), slightly surpassing August's maximum of 37°C (100°F). Moreover, September experiences more precipitation, with 103 mm (4.0 in) spread over 11 days, compared to August's 64 mm (2.5 in) over 9 days. Despite the increased rainfall in September, humidity remains relatively high at 76%, just above August's 73%. For a more detailed look at the August weather, you can check Atotonilco weather in August.

September and October showcase a notable shift in weather patterns. In September, temperatures range from a minimum of 22°C (72°F) to a scorching maximum of 39°C (102°F), with an average of 30°C (86°F). This month also experiences significant rainfall, totaling 103 mm (4.0 in) over 11 days, contributing to a high humidity level of 76%. In contrast, October sees a drop in temperatures, with a minimum of 15°C (59°F) and a maximum of 37°C (99°F), averaging 28°C (82°F). Rainfall is minimal, with only 22 mm (0.9 in) recorded over just one day, leading to a slight decrease in humidity to 72%. For more detailed information, check Atotonilco weather in October.

September and November present a stark contrast in weather conditions. In September, the temperatures are notably higher, with an average of 30°C (86°F) and a maximum reaching up to 39°C (102°F), while November sees a drop to an average of 23°C (74°F) and a maximum of 34°C (93°F). Additionally, September is characterized by significant precipitation, totaling 103 mm (4.0 inches) over 11 days, whereas November experiences much drier conditions with only 17 mm (0.7 inches) of rain over just 2 days. The humidity also remains relatively high in both months, but slightly decreases from 76% in September to 72% in November. For more details on November's weather, check this link: Atotonilco weather in November.

In September, temperatures average around 30°C (86°F), with highs soaring up to 39°C (102°F) and minimums resting at about 22°C (72°F). The month sees a significant amount of rainfall, totaling 103 mm (4.0 in) over approximately 11 days, coupled with a high humidity level of 76%. In contrast, December offers a much cooler climate, with average temperatures of 19°C (66°F), and highs reaching 28°C (82°F) while plunging to a low of 9°C (49°F). Precipitation during this month is significantly lower, with only 12 mm (0.5 in) occurring over just 2 days, and humidity slightly decreased at 72%. For more details, you can check Atotonilco weather in December.

Compare Atotonilco's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Atotonilco

As September unfolds in Atotonilco, the weather takes on a unique character, characterized by warmer temperatures and increased humidity compared to the earlier months of the year. The maximum daytime warmth, often climbing into the high 30s°C, accompanies a rise in precipitation, leading to a noticeable shift as the region experiences roughly 11 days of rain. This marks a contrast to the typically drier summer months, creating a lush environment that rejuvenates the landscape. If you're curious about the broader trends and nuances of Atotonilco's weather patterns, be sure to explore more at Atotonilco Climate.