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Mystic weather in September 2025
Expect 22°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Mystic in September. Check more long-term weather averages for Mystic in September before you book your next holiday to Connecticut in 2025/2026.
- 2222°C max day temperature
- 8 hours of sunshine per day
- 88 days with some rainfall
- 1212°C min night temperature
- 1212 hours of daylight per day
- 0No heat & humidity
- 9797 mm of monthly rainfall
- 66 (High) UV index
- 1919°C sea temperature
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Recommended for Connecticut
The September weather guide for Connecticut (Mystic) 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 the USA
How hot is it in Mystic in September?
Daytime temperatures usually reach 22°C in Mystic in September, falling to 12°C at night.
How sunny is it in Mystic in September?
There are normally 8 hours of bright sunshine each day in Mystic in September - that's 60% of daylight hours.
How warm is the sea around Mystic in September?
The average sea temperature around Mystic in September is 19°C.
Does it rain in Mystic in September?
There are usually 8 days with some rain in Mystic in September and the average monthly rainfall is 97mm.
What is the chance of a hurricane in Mystic in September?
On average less than 1 day in September in Mystic is likely to be affected by the passage of one or more tropical storms.
Mystic September sunrise & sunset times
Browse the sunrise and sunset times for Mystic in September 2025. Select a month to view Mystic sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:14 | 18:20 |
Monday, 15th September 2025 | 05:29 | 17:57 |
Tuesday, 30th September 2025 | 05:44 | 17:31 |
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