Guadalajara weather in September
September in Guadalajara: hot, soaked, with muggy air — fine if you can take 19 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#10 of 12 months in Guadalajara · #898 of 1413 destinations to visit in September · comfort 73/100 (tier B)
- Days
- 29°C
- Nights
- 17°C
- Wet days
- 19
- Sun
- 10 h
- Humidity
- 78%
- Daylight
- 12 h
Traveller notes on Guadalajara in September
Other months in Guadalajara
Forum posters describe June as the start of Guadalajara's rainy season, but note the pattern is genuinely manageable: rain hardly ever falls in the morning, so outdoor plans scheduled early in the day tend to go untouched, and afternoon or evening downpours come down hard but rarely last for hours. Posters do flag real traffic disruption during rainy season, especially between 4 and 7pm, when flash flooding can affect underpasses across the city. Posters consistently recommend carrying an umbrella and, for those sensitive to bites, some mosquito protection given the wetter conditions. Posters note temperatures drop noticeably and pleasantly right after a downpour. Posters generally rate June as warm and rain-prone but easy to plan around, mornings and evenings the reliably pleasant stretches of the day.
December is among Guadalajara's coolest months, and the forum's framing is all about the daily swing: comfortable by day at around 25°C, then dropping away sharply once the sun goes — the record puts nights near 12°C. Pack for both ends, light fabrics for the afternoon and a proper jumper or jacket for the evening. Rain is essentially finished by December, two days across the month. One practical warning if the trip covers Christmas itself: a great deal closes for the key days in Mexico.
Add your own note from Guadalajara's card on the map.
Guadalajara climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Guadalajara in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyIndependence Day, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Guadalajara's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherGuadalajara's weather peaks November–January.
Best weatherFair weatherToughest weather
What's on in Guadalajara in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
El temporal
15 Jun – 15 OctMonsoonRiskThe summer rains arrive as a hard storm most late afternoons, often with hail, and the streets in the low colonias flood for an hour before it drains. Mornings stay clear and the whole valley turns green.
- Holiday
Independence Day
14–17 SepNational holidayCrowdedClosuresEl Grito from the balcony of the Palacio de Gobierno on the night of the 15th fills the Plaza de Armas, and the military parade takes the centre the following morning. Everything shuts on the 16th. Source ↗
Nearby, and something's on
Within 300 km of Guadalajara — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Guadalajara?
Guadalajara in September — FAQ
- Is September a good time to visit Guadalajara?
- September in Guadalajara: hot, soaked, with muggy air — fine if you can take 19 rainy days. It ranks #10 of 12 months for Guadalajara on SeasonMap's comfort score (73/100).
- What is the weather like in Guadalajara in September?
- In September, Guadalajara averages a daily high of 28.6°C and a low of 16.5°C, with about 172.6 mm of rain over roughly 18.8 rainy days.
- What is the air quality in Guadalajara in September?
- Guadalajara has a mean US Air Quality Index of about 54 in September.
Within 300 km: San Miguel de Allende's Independence and Sanmiguelada around 15–18 Sep, and Guanajuato's Independence days on 13–17 Sep.