Lewiston (ID)
September
Weather in Lewiston, Idaho for September 2027
Your guide to Lewiston weather in September - trends and predictions
In general, the average temperature in Lewiston at the beginning of September is 30.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.9 °C by the end of September.
With an average of 5 rainy days, Lewiston experiences minimal rainfall in September.
Is September a good time to visit Lewiston? check out the best time to travel to Lewiston page.
✨ Is September a good time to visit Lewiston? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
25
Dry days
5
Rainy days
0
Snow days
25°/12°
Temperatures
14 km/h
Avg max wind
47 %
Avg humidity
Lewiston Weather September
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Temperatures trend during September in Lewiston
See the weather trend as well as the moving average line
September weather in Lewiston day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 35° /18° | 0.1 mm | 5 | |
| Sept. 2 |  Moderate rain | 31° /16° | 18.2 mm | 6 | |
| Sept. 3 |  Heavy rain | 29° /16° | 70.6 mm | 6 | |
| Sept. 4 | Moderate rain | 32° /15° | 10.4 mm | 6.6 | |
| Sept. 5 | Sunny | 29° /12° | 0 mm | 6.5 | |
| Sept. 6 |  Cloudy | 29° /13° | 0.4 mm | 5 | |
| Sept. 7 |  Overcast | 27° /15° | 0.9 mm | 4 | |
| Sept. 8 |  Thundery outbreaks possible | 28° /12° | 0 mm | 6 | |
| Sept. 9 | Overcast | 28° /13° | 0 mm | 6 | |
| Sept. 10 | Overcast | 28° /15° | 0 mm | 5 | |
| Sept. 11 |  Patchy rain possible | 22° /14° | 1.1 mm | 4 | |
| Sept. 12 |  Light rain | 23° /12° | 2.9 mm | 3 | |
| Sept. 13 | Light rain | 23° /11° | 6.2 mm | 5 | |
| Sept. 14 | Light rain | 20° /11° | 4.9 mm | 4 | |
| Sept. 15 | Overcast | 20° /10° | 0 mm | 4 | |
| Sept. 16 | Sunny | 24° /11° | 0.3 mm | 5.5 | |
| Sept. 17 | Patchy rain possible | 23° /12° | 0.6 mm | 5 | |
| Sept. 18 | Overcast | 26° /13° | 0 mm | 5.3 | |
| Sept. 19 | Sunny | 27° /14° | 0 mm | 5.2 | |
| Sept. 20 | Sunny | 26° /12° | 0 mm | 5.1 | |
| Sept. 21 | Overcast | 23° /11° | 0 mm | 5 | |
| Sept. 22 | Cloudy | 23° /11° | 0 mm | 4 | |
| Sept. 23 | Sunny | 25° /11° | 0 mm | 4.9 | |
| Sept. 24 | Sunny | 29° /12° | 0 mm | 4.8 | |
| Sept. 25 | Patchy rain possible | 26° /12° | 2.1 mm | 4.7 | |
| Sept. 26 |  Partly cloudy | 19° /9° | 0 mm | 4 | |
| Sept. 27 | Sunny | 23° /8° | 0 mm | 4.5 | |
| Sept. 28 | Overcast | 24° /9° | 0 mm | 4.4 | |
| Sept. 29 | Overcast | 21° /9° | 0 mm | 4.3 | |
| Sept. 30 | Sunny | 19° /8° | 0.2 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Lewiston in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Lewiston forecast closer to your planned date for the most up-to-date weather information.
Change Month
Lewiston in September - FAQ
What are the expected maximum and minimum temperatures in Lewiston during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Lewiston during September?
Significant rainfall exceeding 119 mm is expected in Lewiston during September, occurring over more than 5 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Lewiston during September?
The average wind speed in Lewiston during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Lewiston
Explore the daily rainfall trends and prepare for Lewistons September weather 💧
Typically, Lewiston has 5 rainy days in September with a total of 119 mm of rainfall.
UV exposure in Lewiston during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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