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Nez Perce County (Lewiston)
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United States weather

Weather in Nez Perce County, Idaho for September 2025

Your guide to Nez Perce County weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Nez Perce County 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 Nez Perce County predicts a temperature of 25.6 °F, which is cooler than the historical average.

  • In general, the average temperature in Nez Perce County 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, Nez Perce County 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

Nez Perce County 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 Nez Perce County

See the weather trend as well as the moving average line

September weather in Nez Perce County 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 Nez Perce County 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 Nez Perce County forecast closer to your planned date for the most up-to-date weather information.
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Nez Perce County in September - FAQ

What are the expected maximum and minimum temperatures in Nez Perce County 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 Nez Perce County during September?
Expect minimal rainfall in Nez Perce County 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 Nez Perce County during September?
The average wind speed in Nez Perce County during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Nez Perce County

Explore the daily rainfall trends and prepare for Nez Perce Countys September weather 💧

UV exposure in Nez Perce County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Lewiston
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Location coordinates Where is Nez Perce County?

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

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