September Weather in Chapultepec, Mexico

Last updated: April 22, 2025

In September, Chapultepec, Mexico experiences a dynamic blend of weather conditions marked by warm temperatures and considerable precipitation. The month sees a maximum temperature soaring to 35°C (96°F), while the average temperature hovers around a comfortable 26°C (79°F), and nights dip to a refreshing 17°C (63°F). However, this warm setting is accompanied by heavy rainfall, with 326 mm (12.8 in) falling over 24 days, contributing to a high humidity level of 84%. This combination creates a humid yet vibrant atmosphere, perfect for enjoying the rich culture and lush scenery Chapultepec has to offer.

September Temperature in Chapultepec

September in Chapultepec, Mexico, ushers in a delightful transition as the temperatures remain warm yet become slightly cooler than the summer peak. With minimums around 17°C (63°F) and daily averages reaching 26°C (79°F), the month offers a comfortable climate for outdoor activities. The maximums, peaking at about 35°C (96°F), still reflect summer's tail end, allowing for plenty of sun-filled days. As summer fades, September strikes a balance, providing pleasant conditions perfect for exploring the lush landscapes of Chapultepec. This gradual shift lays the groundwork for the cooler temperatures that follow in October, marking an inviting time to experience the area's beauty.

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

The chart illustrates September temperature patterns in Chapultepec, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec656771768079798079757066
Data source: Temperature data for Chapultepec 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 Chapultepec

In September, Chapultepec experiences a notable peak in precipitation, with 326 mm (12.8 in) of rain falling over 24 days. This significant rainfall marks the culmination of the wet season, reflecting a trend of increasing precipitation from the warmer months preceding it. Following a summer characterized by heavy downpours—July and August both saw over 260 mm—September solidifies its status as the month with the highest rainfall, just shy of October’s 330 mm. As the monsoon season transitions, this surge in precipitation not only contributes to the lush greenery of the region but also serves as a reminder of the impactful seasonal shifts that characterize Chapultepec's climate.

September Precipitation Trends in Chapultepec

The chart displays monthly precipitation patterns in Chapultepec, 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.
JanFebMarAprMayJunJulAugSepOctNovDec979012213115526323026132633014762
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chapultepec

In September, Chapultepec experiences a notable rise in humidity, reaching 84%. This marks a shift from the drier summer months of July and August, which saw lower humidity levels at 72% and 74%, respectively. As the year progresses, the trend suggests a gradual increase in moisture, returning to higher levels reminiscent of the wetter winter months. Following September, October sees a significant uptick to 92%, signaling the onset of a season characterized by lushness and a return to the humid conditions akin to the start of the year. This pattern highlights the seasonal ebb and flow of humidity, creating a dynamic climate that influences the area's vibrant ecosystem.

September Average Humidity in Chapultepec

This chart illustrates the average monthly humidity levels in Chapultepec, 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.
JanFebMarAprMayJunJulAugSepOctNovDec89%86%83%80%82%79%72%74%84%92%91%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chapultepec

In September, the UV Index in Chapultepec, Mexico, remains notably high, peaking at 12 with an extreme exposure category and a burn time of only 10 minutes. This trend follows a summer marked by consistently high UV ratings, reaching peaks of 13 from May through August. With such intensity, sun protection is crucial as the season transitions into fall, keeping the risk of skin damage significant. As the cooler months approach, October sees a slight dip to 11, yet the dangers of intense UV exposure linger. Stay informed about the UV Index to safeguard your skin during these sunny days in Chapultepec: Chapultepec UV Index.

Maximum UV Index Levels in Chapultepec for September

The chart shows the monthly maximum UV Index (UVI) for Chapultepec 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.
JanFebMarAprMayJunJulAugSepOctNovDec810111213131312121197
Data source: Chapultepec 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 Chapultepec

As September unfolds in Chapultepec, Mexico, the city experiences a gentle decline in sunshine, basking in 280 hours of radiant light. This month follows a summer peak in July, where the sun graced the skies for an impressive 320 hours. While September welcomes a soft retreat from the sun-soaked days of summer, it still stands as a vibrant time, markedly more luminous than the winter months, such as January's 195 hours. Overall, the trend reveals a gradual easing into the cooler seasons, yet September’s sunshine maintains a warm glow that invites residents and visitors alike to enjoy the beautiful parks and cultural richness of Chapultepec before autumn sets in.

Monthly Sunshine Duration in Chapultepec: September Highlighted

The September sunshine duration represents the total number of hours Chapultepec 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.
JanFebMarAprMayJunJulAugSepOctNovDec195h234h282h287h313h292h320h309h280h273h251h258h
Data source: Chapultepec September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Chapultepec During September

In Chapultepec, Mexico, September brings a 21% chance of sunny weather, marking a slight dip in sunshine from the peak summer months. This fall month tends to be a transitional period, as the likelihood of sunny days gradually decreases from the vibrant summer to the more overcast conditions of autumn. While the percentage is notably higher compared to the rainy season in June, which sees just 11% sunshine, it is lower than the bright days of March at 41% and the sunny peaks of December at 49%. As September rolls in, residents and visitors alike can expect a mix of sun and clouds, suggesting it's a lovely time to enjoy the lush surroundings before the cooler months set in.

Percentage of Sunny Days in September in Chapultepec

The chart illustrates the percentage of sunny days in Chapultepec 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 Chapultepec experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%30%41%34%34%11%24%33%21%31%38%49%
Data source: Chapultepec September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Chapultepec in September

As the seasons shift in Chapultepec, Mexico, September enjoys a moderate daylight duration of 12 hours, consistent with the preceding months of August and March. This month marks a transition where the amount of sunlight begins to taper off from the peak of May through July, which boast the longest days with 13 hours of light. Following September, daylight steadily decreases into the fall and winter months, returning to 11 hours in October and January and culminating in a mere 10 hours by December. This trend reflects the natural ebb and flow of light throughout the year, with September serving as a gentle reminder of the balance between the lingering warmth of summer and the encroaching chill of autumn.

Average Daylight Hours in Chapultepec for September

The chart illustrates the variation in daylight duration in Chapultepec throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 2m11h 28m12h 2m12h 36m13h 5m13h 19m13h 11m12h 46m12h 13m11h 38m11h 9m10h 55m
Data source: Chapultepec daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Chapultepec

In September, the gentle breeze in Chapultepec, Mexico, reveals a subtle shift in the seasonal trend, with an average wind speed of 1.4 m/s (3 mph), marking a continuation of the softer summer winds experienced during August. This slight decrease in wind speed, following a mild summer, suggests a mellow transition into the crisper months that lie ahead. Throughout the year, wind speeds typically show a gradual increase from the start of the year, peaking slightly in April, before tapering off as autumn approaches. These calm September winds invite locals and visitors alike to stroll through the lush landscapes of Chapultepec, embracing the serene atmosphere that this transitional month brings.

Average September Wind Speed in Chapultepec

The chart displays monthly wind speed patterns in Chapultepec, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.61.71.71.81.71.41.41.61.4 m/s1.41.51.5
Data source: Chapultepec September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Chapultepec Compares to Other Months

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

In September, the weather is markedly warmer, with temperatures ranging from a minimum of 17°C (63°F) to a maximum of 35°C (96°F), and an average of 26°C (79°F). This month witnesses significant rainfall, totaling 326 mm (12.8 in) over 24 days, contributing to a high humidity level of 84%. In contrast, January experiences cooler temperatures, with a minimum of 7°C (45°F) and a maximum of 32°C (91°F), averaging at 18°C (65°F). The rainfall is much lighter in January, with only 97 mm (3.8 in) spread across 14 days, and humidity slightly higher at 88%. For more details on January weather in the region, check out Chapultepec weather in January.

In September, the weather is notably warmer, with average temperatures reaching 26°C (79°F) and maximums soaring to 35°C (96°F). The month sees significant precipitation, totaling 326 mm (12.8 in) over 24 days, contributing to a high humidity level of 84%. In contrast, February offers a much cooler climate, with temperatures ranging from a low of 6°C (44°F) to a comfortable average of 20°C (68°F), and maximums peaking at 33°C (92°F). February experiences considerably less rainfall, with only 90 mm (3.5 in) over 13 days, and humidity slightly higher at 86%. For more details on February's weather, you can refer to Chapultepec weather in February.

In comparing the weather of September and March, we see distinct differences in temperature and precipitation patterns. September experiences warmer conditions, with average temperatures ranging from a minimum of 17°C (63°F) to a maximum of 35°C (96°F) and an average of 26°C (79°F). In contrast, March presents cooler weather, with temperatures ranging from 9°C (48°F) to 35°C (95°F) and an average of 22°C (71°F). Moreover, September is significantly wetter, boasting 326 mm (12.8 in) of precipitation over 24 days, while March has only 122 mm (4.8 in) over 15 days. Despite slight differences in humidity, both months remain relatively high, at 84% in September and 83% in March. For more insights on March conditions, you can check out Chapultepec weather in March.

In comparing the weather between September and April, September tends to be warmer and significantly wetter. With temperatures ranging from a minimum of 17°C (63°F) to a maximum of 35°C (96°F) and an average of 26°C (79°F), September sees a high level of humidity at 84%. In contrast, April has a slightly cooler temperature range, with a minimum of 12°C (53°F), an average of 24°C (76°F), and a peak temperature of 36°C (98°F). April also experiences considerably less rainfall, with only 131 mm (5.2 in) over about 12 days, compared to September's 326 mm (12.8 in) over 24 days. Despite the cooler temperatures, the humidity in April remains relatively high at 80%. For more specific insights into the April weather, visit Chapultepec weather in April.

In comparing the weather of September and May, both months exhibit similar minimum temperatures, around 17°C (63°F), and average temperatures that hover close to 26°C (79°F). However, May tends to have slightly higher maximum temperatures, reaching up to 37°C (99°F), compared to September's peak of 35°C (96°F). Precipitation is significantly higher in September, with 326 mm (12.8 in) over 24 days, while May sees only 155 mm (6.1 in) over 17 days. Humidity levels are relatively comparable, with September at 84% and May slightly lower at 82%. For a detailed look at May's climate, you can explore Chapultepec weather in May.

September and June exhibit similar average temperatures, with both months hovering around 26°C (79°F). However, September tends to be slightly warmer at its maximum, reaching up to 35°C (95°F), compared to June’s peak of 36°C (98°F). Precipitation levels in September are notably higher, with 326 mm (12.8 in) of rainfall over 24 days, while June sees a lesser amount of 263 mm (10.3 in) under the same number of rainy days. Additionally, September's humidity is higher at 84%, compared to June's 79%. For more detailed insights, you can explore the Chapultepec weather in June.

In comparing the weather between September and July, September tends to be more humid with an average humidity of 84%, compared to July's 72%. While both months have similar average temperatures around 26°C (79°F), September experiences a wider temperature range with a minimum of 17°C (63°F) and a maximum of 35°C (96°F), whereas July's temperatures range from 20°C (68°F) to 34°C (93°F). Additionally, September sees significantly more precipitation, totaling 326 mm (12.8 in) over 24 days, compared to July's 230 mm (9.1 in) over 28 days. For a deeper dive into July weather specifics, you can check Chapultepec weather in July.

In comparing the weather conditions of September and August, we observe that both months offer similar temperature ranges, with September having a slightly lower minimum temperature of 17°C (63°F) compared to August’s 19°C (67°F). The average temperatures remain close, with September averaging 26°C (79°F) and August at 27°C (80°F). However, September is characterized by notably higher precipitation levels, receiving 326 mm (12.8 in) over 24 days, compared to August's 261 mm (10.3 in) across 27 days. Additionally, September experiences higher humidity at 84%, while August's humidity is at 74%. For a more detailed overview of August weather, you can visit Chapultepec weather in August.

In September, the weather is characterized by warm to hot temperatures, with a minimum of 17°C (63°F) and a maximum of 35°C (96°F), alongside an average temperature of 26°C (79°F). The month experiences significant precipitation, totaling 326 mm (12.8 in) over 24 days, contributing to a high humidity level of 84%.

In contrast, October sees a slight drop in temperatures, with a minimum of 14°C (58°F) and an average of 24°C (76°F), while the maximum reaches 34°C (94°F). Precipitation increases slightly to 330 mm (13.0 in), but it occurs over fewer days, totaling 20 days. Humidity also rises to 92%, making the air feel even muggier. For more detailed weather information during this period, you can check Chapultepec weather in October.

September and November present contrasting weather conditions. In September, temperatures range from a minimum of 17°C (63°F) to a sweltering maximum of 35°C (96°F), with an average of 26°C (79°F). The month is characterized by high humidity at 84% and significant rainfall, totaling 326 mm (12.8 in) over 24 days. In contrast, November sees much cooler temperatures, with a minimum of 5°C (41°F) and a maximum of 31°C (88°F), averaging at 21°C (70°F). Additionally, November experiences lower precipitation, accumulating 147 mm (5.8 in) over 16 days, and a slightly higher humidity level of 91%. For more detailed insights, you can check Chapultepec weather in November.

In September, the weather is characterized by warm temperatures, ranging from a mild 17°C (63°F) at night to a sweltering maximum of 35°C (96°F) during the day, with an average of 26°C (79°F). This month sees significant rainfall, totaling 326 mm (12.8 in) across 24 days, resulting in high humidity levels at 84%. On the other hand, December experiences cooler conditions, with temperatures dipping to a minimum of 5°C (41°F), an average of 19°C (66°F), and a maximum of 31°C (89°F). Precipitation is much lighter, measuring only 62 mm (2.4 in) over 10 days, though the humidity remains high at 91%. To explore more about this month’s climate, check out Chapultepec weather in December.

Compare Chapultepec's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Chapultepec

As September rolls into Chapultepec, it ushers in a distinctive blend of warm temperatures and high humidity, making the month markedly different from the milder conditions of the preceding summer. The air is often thick with moisture, contributing to an average temperature that feels balmy yet can spike to a sweltering maximum. September stands out not only for its warmth but also for its ample rainfall, with over three weeks of precipitation that transforms the lush landscape into a vibrant tapestry of green. This month is characterized by an invigorating blend of heat and rain, providing a unique ambiance that sets it apart from the drier months that precede it. For more details on how September weather fits into the overall patterns of the year, visit Chapultepec Climate.