Mexico in September: where is it warmest?
In September, Mexicali is the warmest place with 39 °C by day, Heroica Puebla de Zaragoza the coolest with 21 °C. 13 of 25 destinations have good holiday weather.
All destinations in September, warmest first
Long-term averages for the month: daytime high, sea, sunshine and rainy days.
| Place | Score | Air | Sea | Sun | Rain days |
|---|---|---|---|---|---|
| Mexicali | 50 | 39° | – | 10 h | 2 |
| La Paz, Mexico | 52 | 33° | 29° | 8 h | 7 |
| Mérida | 27 | 33° | – | 7 h | 19 |
| Chichen Itza | 21 | 33° | – | 7 h | 20 |
| Cabo San Lucas | 77 | 32° | 29° | 8 h | 15 |
| Culiacán | 29 | 32° | – | 6 h | 18 |
| Tulum | 73 | 30° | 30° | 7 h | 23 |
| Isla Mujeres | 73 | 30° | 29° | 7 h | 24 |
| Playa del Carmen | 72 | 30° | 30° | 7 h | 24 |
| Veracruz | 46 | 30° | 30° | 7 h | 23 |
| Mazatlán | 39 | 30° | 30° | 5 h | 20 |
| Cancún | 73 | 29° | 29° | 7 h | 24 |
| Zihuatanejo | 70 | 29° | 30° | 6 h | 23 |
| Puerto Vallarta | 65 | 29° | 30° | 4 h | 28 |
| Monterrey | 65 | 29° | – | 6 h | 10 |
| Acapulco de Juárez | 48 | 29° | 30° | 7 h | 25 |
| Guadalajara | 60 | 26° | – | 6 h | 21 |
| Ensenada | 100 | 25° | 20° | 9 h | 1 |
| Tijuana | 100 | 24° | – | 9 h | 1 |
| San Miguel de Allende | 70 | 24° | – | 6 h | 13 |
| Oaxaca de Juárez | 57 | 24° | – | 5 h | 20 |
| Guanajuato | 68 | 23° | – | 6 h | 14 |
| Mexico City | 56 | 21° | – | 4 h | 16 |
| Teotihuacan | 56 | 21° | – | 4 h | 16 |
| Heroica Puebla de Zaragoza | 54 | 21° | – | 4 h | 22 |
Mexico in September: quick answers
Mexico in September: where is it warmest?
The warmest places in September are Mexicali (39 °C), La Paz, Mexico (33 °C) and Mérida (33 °C).
Mexico in September: where is the sea warmest?
The sea is warmest at Tulum (30 °C), Playa del Carmen (30 °C) and Veracruz (30 °C).
Mexico in September: where is the weather best?
The best holiday weather in September – warm, sunny and dry – is in Ensenada, Tijuana and Cabo San Lucas.
Mexico month by month
Mexico: weather & best time to visit
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences