Last updated: April 22, 2025
September in Mexico City brings a refreshing blend of warm days and cool nights, with daytime temperatures peaking at 25°C (77°F) and dipping to a crisp 6°C (43°F) at night. The average temperature settles around 16°C (61°F), creating a comfortable climate for both residents and visitors. However, this month also marks one of the wettest periods of the year, with 204 mm (8.0 in) of rainfall spread across 22 days, contributing to a humidity level of 82%. Expect frequent, yet brief showers that enhance the area's greenery and vitality, making September a dynamic month to experience the bustling life of Mexico City.
In September, Mexico City experiences mild and pleasant temperatures, with minimums around 6°C (43°F) and maximums reaching 25°C (77°F). The average temperature hovers at a comfortable 16°C (61°F), aligning closely with the previous months of August and July, which also showcase cool evenings and comfortable days. As the city transitions from summer to fall, the warmth of early September offers a charming backdrop for outdoor activities, while cooler nights remind residents of the approaching autumn. Overall, September's weather presents an enticing blend of mildness and freshness, making it an ideal time for exploration in this vibrant metropolis.
September marks a significant peak in precipitation for Mexico City, as the city experiences an impressive 204 mm (8.0 in) of rain over the month, making it the wettest time of the year. This increase is part of a broader trend; rainfall begins to escalate notably from June onwards, with each successive month building up to September's deluge. With an average of 22 rainy days, it is not uncommon for the city to see persistent showers, contributing to the vibrant greenery that characterizes the landscape. Following September, precipitation drops sharply in October to 103 mm (4.0 in), marking a transition to dryer conditions as the rainy season wanes. Overall, September acts as a climatic crescendo, where the annual moisture peaks, underscoring the city’s unique seasonal patterns.
In September, Mexico City experiences a notable increase in humidity, reaching 82%, which marks a transition as the rainy season approaches its climax. This spike follows a gradual decline during the summer months, where July and August see lower humidity levels of 68% and 70%, respectively. As the city shifts from the warmth of summer to the cooler embrace of autumn, the humidity rises, reminiscent of the intense moisture levels found earlier in the year, particularly in January with its peak of 84%. This rhythmic pattern signifies the city’s humid climate, characterized by high humidity levels from October through to December, keeping the air thick and the temperatures pleasant as the year draws to a close.
As September rolls into Mexico City, the UV Index remains strikingly high at 14, categorizing it as extreme, with a burn time of just 10 minutes. This trend of enduring intense sun exposure has been consistent since the early months of the year, peaking in April and May at 15. While slight fluctuations occur during the summer months, with values hovering around 13 to 14, the overall pattern underscores the need for vigilant sun safety measures throughout the year. As the weather shifts towards autumn, it's crucial to stay informed and protect your skin; for more details, visit Mexico City UV Index.
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As summer fades, September in Mexico City continues to bask in a generous 264 hours of sunshine, though this marks a gentle decline from the sun-drenched highs of late spring and early summer. The gradual decrease from May’s peak of 332 hours signals the onset of autumn, yet the city's vibrant energy remains undiminished. Following August’s 285 hours, September strikes a balance, offering a warm embrace of sun before the rainy season reaches its zenith. This transitional month highlights the city’s dynamic climate, inviting both locals and visitors to relish the last rays of summer while the days slowly cool down.
September in Mexico City typically ushers in a significant decrease in sunny weather, with only a 14% chance of sunshine. This marks a stark contrast to the vibrant sunny spells earlier in the year. February shines as the standout month with an impressive 86% likelihood of clear skies, while the spring months maintain reasonable sunshine with chances hovering between 62% and 74%. However, as summer descends, the opportunity for sun dwindles dramatically, with June through August experiencing less than a quarter of sunny days. By September, the trend reaches its low point, suggesting a shift toward overcast skies and potential rains, which persists into the fall months. Thus, if you're planning a trip to Mexico City in September, prepare for cloud cover and embrace the city’s vibrant culture indoors!
As September unfolds in Mexico City, the city enjoys 12 hours of daylight, maintaining a balance between the vibrant sunlit days of summer and the gradually shortening days of autumn. The daylight duration remains consistent with August, reflecting a transition from the peak of summer as the days begin to recede. Looking back, the year starts with a steady 11 hours in January and February, gradually increasing as spring approaches, reaching a height of 13 hours from May to July. The slight decrease in September signals the upcoming seasonal shift, leading into October when daylight dips back to 11 hours. This rhythmic change enhances the charm of Mexico City's picturesque evenings, where the warmth of summer lingers just a little longer before embracing the cooler months ahead.
As September unfolds in Mexico City, there's a noticeable softening of the winds, with average speeds dipping to 1.5 m/s (3 mph), the lightest breezes of the year. This gentle shift follows a pattern of gradually decreasing wind speeds throughout the summer months, where July and August experienced just above 1.6 m/s (4 mph). Residents and visitors alike can savor the calm as the bustling city transitions toward autumn, creating a perfect backdrop for leisurely strolls and outdoor activities. The gradual decline in wind speed from earlier months reflects the city's unique climatic rhythm, inviting everyone to embrace the tranquil September ambiance.
The weather in Mexico City 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 Mexico City and find detailed weather information for every month.
September and January showcase contrasting weather patterns. In September, temperatures range from a cool 6°C (43°F) at night to a mild 25°C (77°F) during the day, with an average of 16°C (61°F). This month is characterized by high humidity at 82% and significant rainfall, receiving approximately 204 mm (8.0 in) over 22 days. In stark contrast, January experiences colder temperatures, with minimums dropping to -2°C (28°F) and daily highs reaching a comfortable 25°C (77°F) as well, but with a much lower average of 12°C (54°F). Additionally, January sees minimal precipitation at just 14 mm (0.6 in) over 2 days, while humidity slightly increases to 84%. For more details on January weather specifics, you can check Mexico City weather in January.
In comparing September and February weather, September tends to be cooler and wetter, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F) and an average of 16°C (61°F). It sees substantial rainfall, with 204 mm (8.0 in) of precipitation over 22 days, resulting in higher humidity levels at 82%. In contrast, February boasts milder temperatures, with a minimum of 2°C (36°F) and a maximum of 28°C (82°F), averaging around 14°C (58°F). This month experiences significantly less precipitation, with only 15 mm (0.6 in) over just 4 days and a slightly lower humidity at 78%. For more insights on February weather, check out Mexico City weather in February.
September and March present contrasting weather patterns, despite sharing an average temperature of 16°C (61°F). September tends to be cooler at night with a minimum of 6°C (43°F) compared to March's 4°C (39°F), but experiences a warmer maximum temperature of 25°C (77°F) versus March’s peak of 30°C (86°F). Additionally, September is significantly wetter, with 204 mm (8.0 in) of precipitation over 22 days, while March sees much drier conditions with only 26 mm (1.0 in) of rain over just 6 days. Humidity levels also differ, with September averaging 82% compared to March's 75%. For more detailed insights into the climate, you can check out Mexico City weather in March.
When comparing the weather in September and April, notable differences emerge. September typically experiences a wider temperature range, with minimums around 6°C (43°F) and maximums reaching 25°C (77°F), while April is slightly warmer, with minimums at 5°C (41°F) and maximums soaring to 30°C (86°F). Additionally, September sees significantly more precipitation, averaging 204 mm (8.0 in) over 22 days of rain, compared to April's much drier conditions with only 39 mm (1.5 in) over 9 days. The humidity in September is also higher at 82%, while April enjoys a more comfortable level at 70%. For more detailed insights into the weather patterns for the month of April, you can refer to Mexico City weather in April.
September and May present contrasting weather patterns in terms of temperature and precipitation. In September, temperatures show a range from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), with an average of 16°C (61°F). This month is marked by significant rainfall, averaging 204 mm (8.0 in) over 22 days, alongside high humidity levels at 82%. In contrast, May enjoys warmer temperatures, with a minimum of 7°C (45°F), a maximum of 31°C (88°F), and an average of 18°C (65°F). Precipitation in May is noticeably lighter, at 54 mm (2.1 in) across just 11 days, and humidity is lower at 77%. For more detailed information, you can refer to Mexico City weather in May.
In comparing September and June weather, we observe that September tends to be cooler, with average temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), while June experiences warmer weather, with temperatures ranging from a minimum of 7°C (45°F) to a peak of 31°C (88°F). Additionally, September sees higher precipitation, totaling 204 mm (8.0 in) across 22 days, compared to June's 160 mm (6.3 in) over 17 days. Humidity levels are also slightly elevated in September at 82%, contrasted with June's 76%. For more detailed information on June's weather, you can visit Mexico City weather in June.
In comparing the weather of September and July, September tends to be cooler, with temperatures ranging from a minimum of 6°C (43°F) to a maximum of 25°C (77°F), while July experiences slightly warmer temperatures, from 8°C (48°F) to 26°C (80°F). September is characterized by higher precipitation, averaging 204 mm (8.0 in) over 22 rainy days and a humidity level of 82%, compared to July's 161 mm (6.3 in) over 24 days with lower humidity at 68%. This makes September feel more humid and wet than July, which is typically drier and a bit warmer. For more detailed insights, you can check Mexico City weather in July.
In comparing the weather between September and August, it is evident that both months have a similar average temperature of 16°C (61°F). However, September experiences cooler minimum temperatures, dropping to 6°C (43°F), whereas August has a milder minimum of 9°C (49°F). Interestingly, the maximum temperatures are also slightly lower in September, reaching 25°C (77°F) compared to August’s 26°C (78°F). Precipitation levels are notably higher in September, with 204 mm (8.0 in) over 22 days, compared to 186 mm (7.3 in) over 26 days in August, contributing to a higher humidity level of 82% in September versus 70% in August. For more detailed insights on August weather, you can refer to Mexico City weather in August.
September and October offer notable differences in weather patterns. September sees a broader temperature range, with minimums around 6°C and maximums reaching up to 25°C, while October's temperatures dip slightly, with minimums at 3°C and a maximum of 26°C. Precipitation also decreases significantly in October, dropping to 103 mm compared to September's 204 mm, and the number of rainy days reduces from 22 to 15. Additionally, October experiences higher humidity at 91%, slightly above September's 82%. For detailed insights, you can explore the Mexico City weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a minimum of 6°C (43°F) to a pleasant maximum of 25°C (77°F), with an average of 16°C (61°F). The month experiences significant precipitation, totaling 204 mm (8.0 in) over 22 days, and the humidity averages 82%. In contrast, November sees cooler temperatures, with a minimum of 1°C (34°F) and an average high of 26°C (79°F), but it is drier, with only 31 mm (1.2 in) of rain over just 5 days and increased humidity at 89%. For more detailed insights, check out Mexico City weather in November.
September and December present contrasting weather patterns. In September, temperatures range from a low of 6°C (43°F) to a high of 25°C (77°F), with an average of 16°C (61°F). The month is also characterized by significant rainfall, experiencing a total precipitation of 204 mm (8.0 in) over 22 days, accompanied by a high humidity level of 82%. In contrast, December sees cooler temperatures, with a minimum of -1°C (30°F) and a maximum of 24°C (76°F), averaging around 12°C (55°F). This month experiences much less precipitation, with only 7 mm (0.3 in) falling over just one day, although humidity rises slightly to 88%. For more details, you can check Mexico City weather in December.
As September rolls into Mexico City, the weather experiences a notable shift from the drier months of the summer. With average temperatures hovering around a refreshing 16°C (61°F), the days are pleasantly warm but the nights can dip to a cool 6°C (43°F). This month is marked by a significant increase in precipitation, contributing to the city's lush landscape, as 22 days are likely to see rain totaling 204 mm (8.0 in), making it one of the wettest times of the year. Coupled with high humidity levels at 82%, September gives the city a vibrant, refreshing feel that contrasts with the dryer, hotter seasons. For a deeper understanding of what to expect throughout the year, dive into our detailed section on Mexico City Climate.