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Lewiston weather in September 2026
Expect daytime maximum temperatures of 25°C in Lewiston, Idaho in September based on long-term weather averages. There are 9 hours of sunshine per day on average.
- 25°C max day temperature
25 - 9 hours of sunshine per day
- 6 days with some rainfall
6 - 9°C min night temperature
9 - 12 hours of daylight per day
12 - No heat & humidity
0 - 21 mm of monthly rainfall
21 - 5 (Moderate) UV index
5
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Recommended for Idaho
The September weather guide for Idaho (Lewiston) 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)
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How hot is it in Lewiston in September?
Daytime temperatures usually reach 25°C in Lewiston in September with no heat and humidity, falling to 8°C at night.
How sunny is it in Lewiston in September?
There are normally 10 hours of bright sunshine each day in Lewiston in September - that's 80% of daylight hours.
Does it rain in Lewiston in September?
There are usually 4 days with some rain in Lewiston in September and the average monthly rainfall is 19mm.
Lewiston September sunrise & sunset times
Browse the sunrise and sunset times for Lewiston in September 2026. Select a month to view Lewiston sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
| Date | Sunrise times | Sunset times |
|---|---|---|
| Tuesday, 1st September 2026 | 05:08 | 18:27 |
| Tuesday, 15th September 2026 | 05:26 | 17:59 |
| Wednesday, 30th September 2026 | 05:46 | 17:29 |
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