easeweather.com
Units
°C
°F
Idaho
Forecast Today Tomorrow
more
United States

Weather in Idaho for September 2025

Your guide to Idaho weather in September - trends and predictions
  • In general, the average temperature in Idaho at the beginning of September is 30.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 27.4 °F by the end of September.

  • Idaho sees moderate rainfall in September, averaging 6 rainy days.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/14°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
35 %
Avg humidity

Idaho in September average weather

Move between months or click on a day
Select a date

You can click on date

Access Idaho weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Got it

Temperatures trend during September in Idaho

See the weather trend as well as the moving average line

September weather day by day

Click on a date for more information
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
34° /19° 0 mm 8
Sept. 2 Patchy rain possible
Patchy rain possible
30° /23° 0.4 mm 7
Sept. 3 Patchy rain possible
Patchy rain possible
25° /16° 0.2 mm 6
Sept. 4 Sunny
Sunny
29° /16° 0 mm 7
Sept. 5 Sunny
Sunny
32° /19° 0 mm 8
Sept. 6 Overcast
Overcast
33° /20° 0 mm 7
Sept. 7 Partly cloudy
Partly cloudy
33° /20° 0 mm 8
Sept. 8 Patchy rain possible
Patchy rain possible
32° /22° 1.2 mm 7
Sept. 9 Sunny
Sunny
31° /19° 0 mm 8
Sept. 10 Overcast
Overcast
28° /19° 0 mm 6
Sept. 11 Patchy light rain with thunder
Patchy light rain with thunder
22° /12° 2.2 mm 5
Sept. 12 Patchy rain possible
Patchy rain possible
16° /11° 3.1 mm 4
Sept. 13 Sunny
Sunny
20° /11° 0 mm 6
Sept. 14 Cloudy
Cloudy
26° /16° 0 mm 6
Sept. 15 Cloudy
Cloudy
25° /17° 0 mm 6
Sept. 16 Thundery outbreaks possible
Thundery outbreaks possible
19° /13° 1.1 mm 4
Sept. 17 Thundery outbreaks possible
Thundery outbreaks possible
17° /10° 15.8 mm 4
Sept. 18 Overcast
Overcast
17° /11° 0 mm 4
Sept. 19 Partly cloudy
Partly cloudy
26° /13° 0 mm 7
Sept. 20 Sunny
Sunny
25° /11° 0 mm 7
Sept. 21 Sunny
Sunny
23° /9° 0 mm 6
Sept. 22 Sunny
Sunny
25° /8° 0 mm 7
Sept. 23 Sunny
Sunny
24° /10° 0 mm 6
Sept. 24 Sunny
Sunny
28° /12° 0 mm 7
Sept. 25 Sunny
Sunny
31° /14° 0 mm 8
Sept. 26 Sunny
Sunny
27° /14° 0 mm 7
Sept. 27 Sunny
Sunny
28° /12° 0 mm 7
Sept. 28 Sunny
Sunny
32° /14° 0 mm 8
Sept. 29 Sunny
Sunny
25° /11° 0 mm 7
Sept. 30 Sunny
Sunny
21° /7° 0 mm 6
Next
Important Notice
Our weather forecast for Idaho 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 Idaho forecast closer to your planned date for the most up-to-date weather information.

Idaho in September - FAQ

What are the expected maximum and minimum temperatures in Idaho during September?
Enjoy moderate daytime temperatures of up to 26° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Idaho during September?
In September, Idaho can expect light to moderate rainfall, totaling 24.1 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Idaho during September?
The average wind speed in Idaho during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Idaho

Explore the daily rainfall trends and prepare for Idahos September weather 💧

UV exposure in Idaho during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in Idaho
Select a province for an accurate weather forecast
Top locations in Idaho
Select a location for an accurate weather forecast
More Locations

Quick links

Location coordinates Where is Idaho?

Get accurate weather forecasts for Idaho, located at latitude 43.614 and longitude -116.203. Stay updated with localized weather information tailored for Idaho.

Found a mistake?
We appreciate your attention to details. Tell us here.