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Jefferson County (Watertown)
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United States weather

Weather in Jefferson County, New York for September 2025

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

    Temperatures

  • Until now, September 2025 in Jefferson County has been nearly identical to the historical average, with a temperature of 22.1 °F (showing only a slight deviation of 0 °F).

  • The forecast for the next days in Jefferson County predicts temperatures to be around 25 °F, close to the historical average.

  • In general, the average temperature in Jefferson County at the beginning of September is 22 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 25.7 °F by the end of September.

    • Rain 🌧️

  • Jefferson County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 133.1 mm.

    • More

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Average dry days
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/13°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Jefferson County Weather September

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

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 Light rain shower
Light rain shower
 24° /12° 1 mm 6
Sept. 2 Cloudy
Cloudy
 20° /12° 0 mm 5
Sept. 3 Sunny
Sunny
 22° /11° 0 mm 6
Sept. 4 Sunny
Sunny
 24° /12° 51.7 mm 6
Sept. 5 Sunny
Sunny
 24° /12° 0 mm 6
Sept. 6 Overcast
Overcast
 22° /13° 25.5 mm 5
Sept. 7 Light rain shower
Light rain shower
 18° /8° 7.6 mm 4
Sept. 8 Light drizzle
Light drizzle
 17° /7° 0.3 mm 5
Sept. 9 Light rain shower
Light rain shower
 20° /9° 1.6 mm 5
Sept. 10 Partly cloudy
Partly cloudy
 20° /8° 0 mm 6
Sept. 11 Overcast
Overcast
 23° /11° 0 mm 6
Sept. 12 Partly cloudy
Partly cloudy
 24° /12° 0 mm 6
Sept. 13 Sunny
Sunny
 23° /13° 0 mm 6
Sept. 14 Mist
Mist
 24° /13° 0 mm 6
Sept. 15 Patchy rain possible
Patchy rain possible
 24° /12° 0.1 mm 6
Sept. 16 Patchy rain possible
Patchy rain possible
 25° /12° 0 mm 6
Sept. 17 Fog
Fog
 24° /15° 0 mm 5
Sept. 18 Sunny
Sunny
 26° /13° 0 mm 1.3
Sept. 19 Overcast
Overcast
 19° /8° 0 mm 1.3
Sept. 20 Sunny
Sunny
 20° /4° 0 mm 1.3
Sept. 21 Sunny
Sunny
 25° /7° 0 mm 1.1
Sept. 22 Patchy rain possible
Patchy rain possible
 28° /15° 0.8 mm 0
Sept. 23 Patchy rain possible
Patchy rain possible
 27° /18° 0.2 mm 5
Sept. 24 Patchy rain possible
Patchy rain possible
 29° /17° 0.5 mm 5
Sept. 25 Patchy rain possible
Patchy rain possible
 29° /19° 0.1 mm 5
Sept. 26 Patchy rain possible
Patchy rain possible
 25° /18° 1.9 mm 5
Sept. 27 Patchy rain possible
Patchy rain possible
 23° /17° 1.2 mm 4
Sept. 28 Patchy rain possible
Patchy rain possible
 24° /16° 0.6 mm 4
Sept. 29 Patchy rain possible
Patchy rain possible
 28° /15° 1.6 mm 5
Sept. 30 Patchy rain possible
Patchy rain possible
 22° /15° 0.8 mm 4
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?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Jefferson County during September?
Significant rainfall exceeding 133.1 mm is expected in Jefferson County during September, occurring over more than 6 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 14 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 43.975 and longitude -75.911. Stay updated with localized weather information tailored for Jefferson County.

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