September Weather in Atotonilco, Mexico

Last updated: April 22, 2025

In September, Atotonilco, Mexico, experiences a temperate climate with maximum temperatures reaching around 24°C (76°F) and average daily temperatures hovering at 16°C (61°F). The minimum temperature drops to 6°C (42°F), providing a cool respite during the nights. This month is characterized by significant precipitation, totaling 267 mm (10.5 in) across approximately 26 rainy days, creating a lush atmosphere enriched by high humidity levels of 82%. Visitors can expect a distinctive blend of warmth and moisture, making for vibrant natural scenery and a refreshing environment.

September Temperature in Atotonilco

In September, Atotonilco, Mexico, experiences mild and comfortable temperatures, making it an ideal time for outdoor exploration. The month showcases a minimum temperature of 6°C (42°F), providing a crisp start to the cooler season, while the average temperature hovers around 16°C (61°F), offering a pleasant climate for both locals and visitors. As the month progresses, temperatures peak at a maximum of 24°C (76°F), maintaining a steady warmth reminiscent of late summer. This pattern of moderate conditions, with a slight chill in the mornings and warmer afternoons, marks September as a transitional month, akin to the preceding months of August and July, where temperatures remained similarly mild.

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.
JanFebMarAprMayJunJulAugSepOctNovDec515557616261606160585452
Data source: Temperature data for Atotonilco 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 Atotonilco

September in Atotonilco, Mexico, marks the height of the rainy season, with a remarkable precipitation total of 267 mm (10.5 in) falling over 26 days. This dramatic increase in moisture compared to previous months, particularly August's 256 mm (10.1 in), showcases the region's transition into its wettest period. As summer gives way to autumn, the persistent rains provide much-needed water for the local ecosystem. The trend towards increased precipitation, peaking in September, clearly reflects the area's climatic patterns, emphasizing the critical role moisture plays in sustaining the vibrant flora and fauna during this lush time of year.

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.
JanFebMarAprMayJunJulAugSepOctNovDec443656751122251782562672047421
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Atotonilco

In Atotonilco, Mexico, September experiences a notable rise in humidity, reaching 82%, a slight uptick from the more moderate levels seen during the summer months. This trend reflects a transition towards the wetter conditions of autumn, as the month precedes the peak of humidity in October at 91%. Notably, the summer months of July and August had relatively lower humidity, dipping to 68% and 70% respectively, making September feel quite humid in comparison. As the year winds down, humidity levels consistently climb, with November and December maintaining high percentages of 89% and 88%. Overall, September serves as a bridge between the drier summer months and the increasingly moist fall, setting the stage for the humid conditions that characterize the latter part of the year.

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.
JanFebMarAprMayJunJulAugSepOctNovDec84%78%75%71%77%76%68%70%82%91%89%88%
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 14, maintaining an extreme exposure category that demands caution. The burn time remains a brief 10 minutes, reflecting the ongoing intensity of solar radiation typical during this time of year. Following a summer peak, where the UV Index consistently hit 15, September signals a slight decrease yet still underscores the need for protective measures against sunburn and skin damage. As the year progresses into October, the UV Index eventually drops to 13, indicating a gradual shift towards milder conditions. For more detailed insights into UV exposure, visit 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.
JanFebMarAprMayJunJulAugSepOctNovDec9121415151515141413108
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

September in Atotonilco, Mexico, marks a delightful transition as the summer sun begins to wane, offering 261 hours of daylight—a figure that reflects a gentle decline from the sun-drenched peaks of the earlier months. This pattern is typical as the region moves from the intensity of May's 323 hours of sunshine towards the cooler embrace of autumn. Despite the gradual reduction, September still boasts a vibrant share of sunlight, setting a picturesque backdrop for outdoor exploration and cultural festivities. It’s a month where the warmth of summer lingers, ensuring that both residents and visitors can savor the beauty of the season before the days grow shorter. As October and November follow with equal hours of 261 and 258, the charm of Atotonilco continues, blending sunlight with the colorful hues of autumn.

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.
JanFebMarAprMayJunJulAugSepOctNovDec219h262h303h306h323h284h300h290h261h261h258h277h
Data source: Atotonilco September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Atotonilco During September

September in Atotonilco, Mexico, ushers in a notable dip in sunny weather, with a mere 12% chance of sun. This trend signifies a significant decline from the brighter months earlier in the year, with February peaking at a robust 70%. As summer stretches into fall, the likelihood of clear skies diminishes sharply, reflecting the region's transition to a wetter season. In comparison to the sun-drenched days of earlier months like March and April, where the chances hover around 64% and 46%, September carries a cloudier disposition, setting the stage for a shift in the weather pattern that many locals have come to anticipate.

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.
JanFebMarAprMayJunJulAugSepOctNovDec42%70%64%46%34%9%13%18%12%26%30%62%
Data source: Atotonilco September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Atotonilco in September

As September rolls into Atotonilco, Mexico, residents enjoy 12 hours of daylight, a delightful balance that mirrors the preceding month of August. This period of sunshine marks a transition from the longer days of summer, which peak at 13 hours in May through July, to the gradual decline leading into fall. The month continues the trend of stability seen since March, where daylight consistently hovers around 12 hours until October. As the year progresses, daylight will progressively wane, but September stands out as a pleasant bridge between the vibrant summer and the cooler months ahead, inviting locals and visitors alike to savor the warmth and beauty of the changing seasons.

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.
JanFebMarAprMayJunJulAugSepOctNovDec11h 3m11h 29m12h 2m12h 36m13h 4m13h 18m13h 10m12h 45m12h 13m11h 39m11h 10m10h 56m
Data source: Atotonilco daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Atotonilco

As September graces Atotonilco, Mexico, the enchanting breezes reflect a subtle shift in the landscape of wind patterns. With an average wind speed of 1.6 m/s (4 mph), this month experiences a slight dip compared to the more robust gusts of the earlier spring and summer months, which reached up to 2.1 m/s in April. The gentle winds of September signal the transition into autumn, bringing a sense of calm after the warmer seasons. Interestingly, this trend of lower wind speeds continues into the fall, mirroring the seasonal adjustments that characterize the region's climate. Embracing the softer September winds, residents and visitors alike can relish the tranquil atmosphere that defines this time of year.

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.
JanFebMarAprMayJunJulAugSepOctNovDec1.82.02.02.11.91.71.72.01.6 m/s1.71.61.7
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.

September and January present distinct weather patterns, each with its unique characteristics. In September, temperatures range from a cooler 6°C (42°F) to a warm high of 24°C (76°F), with an average of 16°C (61°F). The month is marked by considerable rainfall, averaging 267 mm (10.5 in) over 26 days, resulting in high humidity levels of 82%. In contrast, January is relatively milder, with temperatures ranging from a minimum of 0°C (32°F) to the same high of 24°C (76°F), but with an average temperature of only 11°C (52°F). Precipitation drops significantly to 44 mm (1.7 in) over just 8 days, while humidity remains close at 84%. Overall, September is wetter and warmer, while January offers a drier and cooler experience. For more details, you can check the Atotonilco weather in January.

When comparing the weather in September and February, September typically features a wider temperature range, with minimums of 6°C (42°F), an average of 16°C (61°F), and maximums reaching 24°C (76°F). In contrast, February offers milder conditions with temperatures ranging from 0°C (33°F) at its lowest to a maximum of 28°C (82°F), making it generally warmer overall. Additionally, September sees significantly more precipitation, totaling 267 mm (10.5 in) over 26 days, compared to February's lighter rainfall of 36 mm (1.4 in) over just 8 days. Humidity levels are quite high in both months, though slightly higher in September at 82%, compared to February's 78%. For more specific insights, you can check Atotonilco weather in February.

When comparing the weather in September and March, notable differences emerge. September typically offers a milder average temperature of 16°C (61°F) with maximums peaking at 24°C (76°F), while March boasts warmer highs, reaching up to 28°C (82°F). However, September is characterized by significantly higher precipitation, with 267 mm (10.5 in) falling over 26 days, compared to the much drier March, which sees only 56 mm (2.2 in) over 12 days. Additionally, humidity levels are higher in September at 82%, in contrast to March's 75%. For more detailed information on March weather specifically, you can visit Atotonilco weather in March.

When comparing the weather in September and April, we see some notable differences. September experiences a wider temperature range, with daily highs reaching up to 24°C (76°F) and lows around 6°C (42°F), while April boasts milder nights at a minimum of 5°C (41°F) and higher daytime temperatures peaking at 29°C (84°F). Precipitation is significantly higher in September, totaling 267 mm (10.5 in) across 26 days, compared to April’s 75 mm (2.9 in) over 19 days. Additionally, September tends to be more humid, averaging 82%, whereas April's humidity is lower at 70%. This makes April a drier and warmer month overall. For a closer look at April's weather, you can visit Atotonilco weather in April.

When comparing the weather in September and May, it's clear that both months experience mild temperatures, though May tends to be slightly warmer overall. September has a minimum temperature of 6°C (42°F) and an average of 16°C (61°F), peaking at 24°C (76°F). In contrast, May features similar minimum temperatures but averages a bit higher at 17°C (63°F), with maximums reaching up to 29°C (84°F). Additionally, September sees significantly more precipitation, with 267 mm (10.5 in) spread over 26 days, while May has a much drier climate with only 112 mm (4.4 in) over 21 days. Humidity levels are also higher in September at 82%, compared to 77% in May, contributing to a more humid feel during the former month. For more detailed insights, you can refer to Atotonilco weather in May.

When comparing the weather in September and June, we notice some distinct differences in temperature and precipitation patterns. September typically has a minimum temperature of 6°C (42°F) and can reach a maximum of 24°C (76°F), with an average temperature of 16°C (61°F). This month is marked by significant rainfall, averaging 267 mm (10.5 in) over 26 days, resulting in a higher humidity level of 82%. In contrast, June sees slightly warmer temperatures, with a minimum of 8°C (47°F), a maximum of 27°C (81°F), and the same average of 16°C (62°F). Precipitation in June is lower, averaging 225 mm (8.9 in) over 24 days, and the humidity is more manageable at 76%. For a more detailed look at the weather specifics, you can visit Atotonilco weather in June.

In comparing the weather of September and July, it is clear that September experiences cooler temperatures, with a minimum of 6°C (42°F) and an average of 16°C (61°F), while July sees slightly warmer conditions with a minimum of 8°C (47°F) and the same average temperature. Both months share a maximum temperature of around 24°C (75-76°F). However, September is considerably wetter, with 267 mm (10.5 in) of precipitation over 26 days, compared to July's 178 mm (7.0 in) across 28 days. Additionally, September has higher humidity levels at 82%, in contrast to July's 68%. For more specific details on July weather patterns, you can visit Atotonilco weather in July.

In comparing the weather between September and August, we see some notable similarities and differences. Both months have an average temperature of 16°C (61°F) and share a maximum temperature of 24°C (75-76°F). However, September tends to be slightly cooler with a minimum temperature of 6°C (42°F) compared to August's 7°C (45°F). In terms of precipitation, September is wetter, receiving 267 mm (10.5 in) over 26 days, while August records 256 mm (10.1 in) across 28 days. Additionally, September's humidity is higher at 82%, making it feel more damp than August's 70%. For more detailed information specifically about August, you can check Atotonilco weather in August.

September generally experiences warmer temperatures compared to October, with daily averages reaching as high as 24°C (76°F) versus October's peak of 25°C (78°F). However, October tends to be slightly cooler at night with a minimum of 4°C (39°F) compared to September's 6°C (42°F). In terms of precipitation, September is significantly wetter, receiving 267 mm (10.5 in) over 26 days, while October sees a decrease with only 204 mm (8.0 in) spread across 19 days. Additionally, October has a higher humidity level of 91% compared to September's 82%. For a detailed overview of what to expect, check out Atotonilco weather in October.

September and November exhibit distinct differences in weather patterns. In September, temperatures range from a minimum of 6°C (42°F) to a maximum of 24°C (76°F), with an average of 16°C (61°F). This month is marked by significant rainfall, totaling 267 mm (10.5 in) over 26 days, contributing to a relatively high humidity of 82%. In contrast, November experiences cooler temperatures, with a minimum of 0°C (33°F) and an average temperature of 12°C (55°F), while the maximum remains similar at 24°C (75°F). Precipitation drops dramatically to 74 mm (2.9 in) over just 12 days, and humidity increases slightly to 89%. For more detailed information, you can refer to Atotonilco weather in November.

September weather in Atotonilco is characterized by mild temperatures, with a minimum of 6°C (42°F) and an average of 16°C (61°F), peaking at 24°C (76°F). However, it is also marked by considerable rainfall, receiving 267 mm (10.5 in) over 26 days, and maintaining a high humidity level of 82%. In contrast, December experiences colder temperatures, dropping to a minimum of -3°C (27°F) and averaging 11°C (52°F), but still reaching a maximum of 23°C (74°F). Notably, December is much drier, with only 21 mm (0.8 in) of precipitation over just 5 days, despite a slightly higher humidity of 88%. This stark difference in weather highlights the transition from the wetter, warmer conditions of early autumn to the cooler, drier climate of late autumn and winter. For more detailed information, check Atotonilco weather in December.

Compare Atotonilco's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Atotonilco

As September rolls into Atotonilco, the weather transforms into a moist and mild experience, characterized by its increased humidity and frequent rainfall. Unlike the drier, warmer months that precede it, September sees a notable rise in precipitation, blanketing the region with lush greenery. The days may start off pleasantly cool, but the temperatures gradually dip, bringing a refreshing chill to the evenings. This unique mix of conditions makes September an ideal time for nature lovers and those seeking a serene escape. For a deeper understanding of how Atotonilco's climate shapes your travel plans, check out Atotonilco Climate.