Climate averages 1991–2020
Mexico City weather
in September.
A mild, wet month: the 8th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Mexico City: daytime highs average 20.3°C and nights cool to about 11.9°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 173 mm of rain on roughly 20 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 16 min on an average September day.
The nearest other city in this atlas is Gustavo Adolfo Madero (7 km away). In September its highs average 20.3°C, about as warm as Mexico City, with 151 mm of rain.
Among the 153 cities listed in Mexico, Mexico City ranks joint 142nd of 153 for the warmest September highs and joint 94th of 153 for the driest September (rainfall, lowest first). The mean September high of those 153 cities is 26.5°C; Mexico City is 6.2°C cooler than that mean.
From September to October, average highs fall by 0.3°C to 20.0°C, and monthly rainfall falls from 173 mm to 95 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Mexico City climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.9°C6.9°C | 6.9°C | 23 | 4.5 | 11.111 h |
| February | 22.0°C8.0°C | 8.0°C | 20 | 4.1 | 11.511 h |
| March | 24.0°C9.3°C | 9.3°C | 30 | 6.2 | 12.012 h |
| April | 25.1°C11.0°C | 11.0°C | 49 | 8.9 | 12.613 h |
| May | 24.8°C12.0°C | 12.0°C | 75 | 12.2 | 13.013 h |
| June | 22.7°C12.7°C | 12.7°C | 151 | 17.4 | 13.313 h |
| July | 21.2°C11.9°C | 11.9°C | 152 | 22.7 | 13.213 h |
| August | 21.1°C12.1°C | 12.1°C | 159 | 21.9 | 12.813 h |
| September, selected | 20.3°C11.9°C | 11.9°C | 173 | 20.3 | 12.312 h |
| October | 20.0°C10.3°C | 10.3°C | 95 | 13.0 | 11.712 h |
| November | 19.9°C8.5°C | 8.5°C | 33 | 6.5 | 11.211 h |
| December | 20.0°C7.5°C | 7.5°C | 16 | 2.9 | 11.011 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Gustavo Adolfo Madero in SeptemberMexico · 7 kmHigh 20.3°C · Low 11.7°C · 151 mm rain
- Miguel Hidalgo in SeptemberMexico · 8 kmHigh 20.4°C · Low 11.7°C · 173 mm rain
- Coyoacán in SeptemberMexico · 10 kmHigh 20.5°C · Low 11.9°C · 195 mm rain
- Ciudad Nezahualcoyotl in SeptemberMexico · 12 kmHigh 20.8°C · Low 12.1°C · 151 mm rain
- Naucalpan de Juárez in SeptemberMexico · 13 kmHigh 20.2°C · Low 11.5°C · 173 mm rain
- Delegación Cuajimalpa de Morelos in SeptemberMexico · 18 kmHigh 18.6°C · Low 10.0°C · 195 mm rain
- Xochimilco in SeptemberMexico · 19 kmHigh 20.2°C · Low 11.7°C · 273 mm rain
- Ciudad López Mateos in SeptemberMexico · 20 kmHigh 20.6°C · Low 11.8°C · 173 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Mexico City) is explained once on the Mexico City year overview and on the Sources, method and limits page.
Naucalpan de Juárez, Ciudad López Mateos and Miguel Hidalgo lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.