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Jefferson County (Louisville)
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United States weather

Weather in Jefferson County, Kentucky for September 2025

Your guide to Jefferson County weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Jefferson County is cooler than usual, with temperatures averaging 26 °F, this is -2.8 °F below the typical seasonal average.

  • The forecast for the upcoming days in Jefferson County predicts a temperature of 32.1 °F, which is slightly above the historical average.

  • In general, the average temperature in Jefferson County at the beginning of September is 29.1 °F. As the month progressed, temperatures tended to moderately rise, reaching an average of 30.4 °F by the end of September.

    • Rain 🌧️

  • Jefferson County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 170.8 mm.

    • More

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Average dry days
21
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/16°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
61 %
Avg humidity

Jefferson County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
31°
2
Mist
30°
3
Partly cloudy
29°
4
Partly cloudy
29°
5
Overcast
31°
6
Light rain shower
29°
7
Overcast
25°
8
Sunny
26°
9
Overcast
27°
10
Partly cloudy
30°
11
Mist
30°
12
Overcast
29°
13
Mist
28°
14
Sunny
29°
15
Partly cloudy
35°
16
Partly cloudy
31°
17
Sunny
27°
18
Sunny
33°
19
Sunny
34°
20
Sunny
34°
21
Patchy rain possible
33°
22
Patchy rain possible
27°
23
Sunny
34°
24
Sunny
32°
25
Sunny
33°
26
Sunny
33°
27
Sunny
32°
28
Sunny
32°
29
Mist
25°
30
Mist
26°

Temperatures trend during September in Jefferson County

See the weather trend as well as the moving average line

September weather in Jefferson County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 31° /16° 0.2 mm 7
Sept. 2 Mist
Mist
 30° /17° 1.5 mm 7
Sept. 3 Partly cloudy
Partly cloudy
 29° /17° 1.2 mm 6
Sept. 4 Partly cloudy
Partly cloudy
 29° /19° 20.9 mm 7
Sept. 5 Overcast
Overcast
 31° /18° 3.5 mm 7
Sept. 6 Light rain shower
Light rain shower
 29° /17° 11.9 mm 6
Sept. 7 Overcast
Overcast
 25° /12° 0.3 mm 6
Sept. 8 Sunny
Sunny
 26° /10° 0.5 mm 6
Sept. 9 Overcast
Overcast
 27° /13° 0 mm 6
Sept. 10 Partly cloudy
Partly cloudy
 30° /15° 0 mm 7
Sept. 11 Mist
Mist
 30° /16° 0 mm 7
Sept. 12 Overcast
Overcast
 29° /17° 0 mm 7
Sept. 13 Mist
Mist
 28° /15° 3.4 mm 7
Sept. 14 Sunny
Sunny
 29° /16° 0.9 mm 7
Sept. 15 Partly cloudy
Partly cloudy
 35° /22° 0 mm 1.6
Sept. 16 Partly cloudy
Partly cloudy
 31° /20° 0 mm 1.4
Sept. 17 Sunny
Sunny
 27° /19° 0 mm 1.6
Sept. 18 Sunny
Sunny
 33° /19° 0 mm 1.6
Sept. 19 Sunny
Sunny
 34° /20° 0 mm 0
Sept. 20 Sunny
Sunny
 34° /20° 0 mm 7
Sept. 21 Patchy rain possible
Patchy rain possible
 33° /22° 0.6 mm 6
Sept. 22 Patchy rain possible
Patchy rain possible
 27° /18° 0.6 mm 5
Sept. 23 Sunny
Sunny
 34° /22° 0 mm 7
Sept. 24 Sunny
Sunny
 32° /20° 0 mm 7
Sept. 25 Sunny
Sunny
 33° /17° 0 mm 6
Sept. 26 Sunny
Sunny
 33° /19° 0 mm 7
Sept. 27 Sunny
Sunny
 32° /20° 0 mm 7
Sept. 28 Sunny
Sunny
 32° /20° 0 mm 7
Sept. 29 Mist
Mist
 25° /15° 15.1 mm 6
Sept. 30 Mist
Mist
 26° /15° 0 mm 6
Next
Important Notice
Our weather forecast for Jefferson 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 Jefferson County forecast closer to your planned date for the most up-to-date weather information.
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Jefferson County in September - FAQ

What are the expected maximum and minimum temperatures in Jefferson County during September?
During September, expect a variety of temperatures with highs around 28° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Jefferson County during September?
Significant rainfall exceeding 170.8 mm is expected in Jefferson County during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Jefferson County during September?
The average wind speed in Jefferson County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Jefferson County

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

UV exposure in Jefferson County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Jefferson County
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BeaumontBirminghamLakewoodLouisvilleWatertown
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Location coordinates Where is Jefferson County?

Get accurate weather forecasts for Jefferson County, located at latitude 38.254 and longitude -85.759. Stay updated with localized weather information tailored for Jefferson County.

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