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Weather in the United States for September 2025

Your guide to the United States weather in September - trends and predictions
  • In general, the average temperature in the United States at the beginning of September is 29 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.6 °F by the end of September.

  • The climate of United States in September is notably wet, with an average of 14 rainy days.

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Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/17°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
69 %
Avg humidity

United States in September average weather

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Temperatures trend during September in the United States

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
27° /18° 2.7 mm 7
Sept. 2 Partly cloudy
Partly cloudy
28° /17° 0 mm 7
Sept. 3 Partly cloudy
Partly cloudy
29° /17° 0 mm 7
Sept. 4 Partly cloudy
Partly cloudy
30° /20° 0 mm 8
Sept. 5 Partly cloudy
Partly cloudy
30° /21° 0 mm 8
Sept. 6 Partly cloudy
Partly cloudy
30° /22° 0 mm 7
Sept. 7 Sunny
Sunny
29° /19° 4.7 mm 7
Sept. 8 Light rain shower
Light rain shower
26° /17° 2.1 mm 7
Sept. 9 Light rain shower
Light rain shower
28° /18° 3.4 mm 7
Sept. 10 Light rain shower
Light rain shower
27° /20° 2.5 mm 7
Sept. 11 Light rain shower
Light rain shower
28° /19° 1.2 mm 7
Sept. 12 Cloudy
Cloudy
27° /18° 0 mm 7
Sept. 13 Moderate or heavy rain shower
Moderate or heavy rain shower
26° /17° 18.2 mm 6
Sept. 14 Cloudy
Cloudy
26° /18° 0 mm 6
Sept. 15 Overcast
Overcast
24° /16° 0 mm 6
Sept. 16 Overcast
Overcast
25° /16° 0 mm 6
Sept. 17 Light drizzle
Light drizzle
23° /15° 0.6 mm 6
Sept. 18 Light rain shower
Light rain shower
21° /17° 14.1 mm 5
Sept. 19 Fog
Fog
24° /16° 7.3 mm 6
Sept. 20 Sunny
Sunny
23° /15° 1.5 mm 6
Sept. 21 Partly cloudy
Partly cloudy
25° /14° 0 mm 6
Sept. 22 Mist
Mist
22° /13° 0 mm 6
Sept. 23 Heavy rain
Heavy rain
19° /14° 23.1 mm 5
Sept. 24 Light rain
Light rain
19° /14° 3.3 mm 5
Sept. 25 Moderate rain
Moderate rain
18° /15° 35.7 mm 4
Sept. 26 Patchy rain possible
Patchy rain possible
22° /15° 23.9 mm 5
Sept. 27 Overcast
Overcast
21° /14° 8.4 mm 5
Sept. 28 Overcast
Overcast
21° /15° 0 mm 5
Sept. 29 Moderate or heavy rain shower
Moderate or heavy rain shower
17° /15° 24.3 mm 4
Sept. 30 Light drizzle
Light drizzle
19° /14° 9 mm 4
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Important Notice
Our weather forecast for the United States 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 United States forecast closer to your planned date for the most up-to-date weather information.

United States in September - FAQ

What are the expected maximum and minimum temperatures in United States during September?
During September, expect a variety of temperatures with highs around 25° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in United States during September?
Significant rainfall exceeding 253.6 mm is expected in United States during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in United States during September?
The average wind speed in United States during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
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Location coordinates Where is the United States?

Get accurate weather forecasts for United States, located at latitude 40.714 and longitude -74.006. Stay updated with localized weather information tailored for United States.

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