Watertown (NY)
September
Weather in Watertown, New York for September 2026
Your guide to Watertown weather in September - trends and predictions
So far, September 2026 in Watertown shows a warmer trend than usual by 2.2 °F.
Expect cooler weather in the next days in Watertown with the forecast suggesting a temperature of 19.4 °F, lower than the historical average.
In general, the average temperature in Watertown at the beginning of September is 22.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19 °F by the end of September.
Watertown experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 210.1 mm.
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Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
22°/12°
Temperatures
15 km/h
Avg max wind
76 %
Avg humidity
Watertown Weather September
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Temperatures trend during September in Watertown
See the weather trend as well as the moving average line
September weather in Watertown day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain shower | 24° /13° | 5.9 mm | 4 | |
| Sept. 2 |  Cloudy | 22° /14° | 4.3 mm | 4 | |
| Sept. 3 |  Sunny | 23° /13° | 2 mm | 6 | |
| Sept. 4 | Sunny | 24° /13° | 34.5 mm | 6 | |
| Sept. 5 | Sunny | 24° /13° | 2.6 mm | 5 | |
| Sept. 6 |  Overcast | 22° /13° | 17 mm | 5 | |
| Sept. 7 | Light rain shower | 21° /9° | 5.1 mm | 5 | |
| Sept. 8 |  Light drizzle | 19° /9° | 0.2 mm | 4 | |
| Sept. 9 | Light rain shower | 21° /11° | 4.8 mm | 4 | |
| Sept. 10 |  Partly cloudy | 21° /10° | 12.3 mm | 6 | |
| Sept. 11 | Overcast | 23° /10° | 0 mm | 6 | |
| Sept. 12 | Sunny | 26° /9° | 0.8 mm | 6 | |
| Sept. 13 | Overcast | 23° /14° | 0.7 mm | 4 | |
| Sept. 14 | Sunny | 16° /9° | 0.4 mm | 5.3 | |
| Sept. 15 | Overcast | 19° /8° | 0 mm | 4 | |
| Sept. 16 | Overcast | 23° /17° | 0.1 mm | 6 | |
| Sept. 17 | Overcast | 20° /12° | 3.7 mm | 4 | |
| Sept. 18 | Light rain shower | 24° /13° | 8.7 mm | 5 | |
| Sept. 19 | Light rain shower | 13° /8° | 23.8 mm | 3 | |
| Sept. 20 | Sunny | 16° /6° | 0 mm | 5 | |
| Sept. 21 | Sunny | 18° /6° | 0 mm | 5 | |
| Sept. 22 | Sunny | 19° /12° | 0 mm | 5 | |
| Sept. 23 | Patchy rain possible | 22° /13° | 1.9 mm | 6 | |
| Sept. 24 | Patchy rain possible | 16° /6° | 1.5 mm | 4 | |
| Sept. 25 | Sunny | 16° /4° | 0 mm | 4 | |
| Sept. 26 | Light rain shower | 20° /15° | 34.2 mm | 5 | |
| Sept. 27 |  Fog | 21° /13° | 0 mm | 5 | |
| Sept. 28 | Mist | 20° /12° | 0 mm | 5 | |
| Sept. 29 | Overcast | 20° /12° | 0 mm | 5 | |
| Sept. 30 | Mist | 20° /11° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Watertown 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 Watertown forecast closer to your planned date for the most up-to-date weather information.
Change Month
Watertown in September - FAQ
What are the expected maximum and minimum temperatures in Watertown during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Watertown during September?
Significant rainfall exceeding 210.1 mm is expected in Watertown during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Watertown during September?
The average wind speed in Watertown during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Watertown
Explore the daily rainfall trends and prepare for Watertowns September weather 💧
Typically, Watertown has 8 rainy days in September with a total of 210.1 mm of rainfall.
UV exposure in Watertown during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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