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Mammoth Lakes weather in September 2025
Expect 19°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Mammoth Lakes in September. Check more long-term weather averages for Mammoth Lakes in September before you book your next holiday to California in 2025/2026.
- 1919°C max day temperature
- 10 hours of sunshine per day
- 55 days with some rainfall
- 22°C min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 2020 mm of monthly rainfall
- 88 (Very High) UV index
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Mammoth Lakes by month
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Recommended for California
The September weather guide for California (Mammoth Lakes) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C / mm) | Imperial (°F / inches)
More about California
How hot is it in Mammoth Lakes in September?
Daytime temperatures usually reach 19°C in Mammoth Lakes in September, falling to 2°C at night.
How sunny is it in Mammoth Lakes in September?
There are normally 10 hours of bright sunshine each day in Mammoth Lakes in September - that's 80% of daylight hours.
Does it rain in Mammoth Lakes in September?
There are usually 5 days with some rain in Mammoth Lakes in September and the average monthly rainfall is 20mm.
Mammoth Lakes September sunrise & sunset times
Browse the sunrise and sunset times for Mammoth Lakes in September 2025. Select a month to view Mammoth Lakes sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:26 | 18:24 |
Monday, 15th September 2025 | 05:38 | 18:03 |
Tuesday, 30th September 2025 | 05:51 | 17:40 |
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