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Lewiston (ID)
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Lewiston (ID)
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United States weather

Weather in Lewiston, Idaho for September 2025

Your guide to Lewiston weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Lewiston has been nearly identical to the historical average, with a temperature of 31.3 °F (showing only a slight deviation of -0.3 °F).

  • The forecast for the next days in Lewiston predicts a temperature of 25.6 °F, which is cooler than the historical average.

  • In general, the average temperature in Lewiston at the beginning of September is 36.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.6 °F by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Lewiston experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/13°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
45 %
Avg humidity

Lewiston Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
39°
2
Sunny
39°
3
Sunny
40°
4
Sunny
39°
5
Sunny
32°
6
Cloudy
34°
7
Overcast
31°
8
Thundery outbreaks possible
29°
9
Sunny
28°
10
Overcast
27°
11
Heavy rain at times
21°
12
Moderate rain at times
21°
13
Partly cloudy
24°
14
Moderate rain
20°
15
Partly cloudy
21°
16
Sunny
30°
17
Sunny
30°
18
Sunny
26°
19
Sunny
26°
20
Sunny
28°
21
Sunny
28°
22
Partly cloudy
24°
23
Partly cloudy
24°
24
Patchy rain possible
26°
25
Partly cloudy
28°
26
Moderate rain
22°
27
Sunny
26°
28
Sunny
28°
29
Patchy rain possible
20°
30
Sunny
15°

Temperatures trend during September in Lewiston

See the weather trend as well as the moving average line

September weather in Lewiston day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 39° /19° 0 mm 9
Sept. 2 Sunny
Sunny
 39° /20° 0 mm 9
Sept. 3 Sunny
Sunny
 40° /20° 0 mm 10
Sept. 4 Sunny
Sunny
 39° /20° 0 mm 9
Sept. 5 Sunny
Sunny
 32° /14° 0 mm 8
Sept. 6 Cloudy
Cloudy
 34° /15° 0 mm 7
Sept. 7 Overcast
Overcast
 31° /17° 0 mm 7
Sept. 8 Thundery outbreaks possible
Thundery outbreaks possible
 29° /13° 0 mm 6
Sept. 9 Sunny
Sunny
 28° /14° 0 mm 7
Sept. 10 Overcast
Overcast
 27° /16° 0 mm 6
Sept. 11 Heavy rain at times
Heavy rain at times
 21° /13° 1.5 mm 5
Sept. 12 Moderate rain at times
Moderate rain at times
 21° /13° 4.3 mm 5
Sept. 13 Partly cloudy
Partly cloudy
 24° /10° 0 mm 6
Sept. 14 Moderate rain
Moderate rain
 20° /12° 10.1 mm 0.4
Sept. 15 Partly cloudy
Partly cloudy
 21° /11° 0 mm 0.7
Sept. 16 Sunny
Sunny
 30° /8° 0 mm 1.4
Sept. 17 Sunny
Sunny
 30° /12° 0 mm 1.4
Sept. 18 Sunny
Sunny
 26° /13° 0 mm 0
Sept. 19 Sunny
Sunny
 26° /12° 0 mm 5
Sept. 20 Sunny
Sunny
 28° /13° 0 mm 5
Sept. 21 Sunny
Sunny
 28° /14° 0 mm 6
Sept. 22 Partly cloudy
Partly cloudy
 24° /14° 0.1 mm 5
Sept. 23 Partly cloudy
Partly cloudy
 24° /13° 0 mm 5
Sept. 24 Patchy rain possible
Patchy rain possible
 26° /12° 0.2 mm 4
Sept. 25 Partly cloudy
Partly cloudy
 28° /13° 0 mm 5
Sept. 26 Moderate rain
Moderate rain
 22° /10° 6.3 mm 4
Sept. 27 Sunny
Sunny
 26° /11° 0 mm 7
Sept. 28 Sunny
Sunny
 28° /10° 0 mm 7
Sept. 29 Patchy rain possible
Patchy rain possible
 20° /5° 0.1 mm 5
Sept. 30 Sunny
Sunny
 15° /1° 0 mm 5
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.
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Lewiston in September - FAQ

What are the expected maximum and minimum temperatures in Lewiston during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Lewiston during September?
Expect minimal rainfall in Lewiston during September, with a total of 10.7 mm over approximately 5 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Lewiston during September?
The average wind speed in Lewiston during September is 15 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 💧

UV exposure in Lewiston during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Lewiston?

Get accurate weather forecasts for Lewiston, located at latitude 46.417 and longitude -117.018. Stay updated with localized weather information tailored for Lewiston.

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