Onondaga County (Syracuse)
September
Weather in Onondaga County, New York for September 2026
Your guide to Onondaga County weather in September - trends and predictions
So far, September 2026 in Onondaga County is slightly warmer than the historical average by 1.6 °F.
The forecast for the next days in Onondaga County predicts a temperature of 17.4 °F, which is cooler than the historical average.
In general, the average temperature in Onondaga County at the beginning of September is 23.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.3 °F by the end of September.
Onondaga County experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 160.9 mm.
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Temperatures
Rain 🌧️
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20
Dry days
10
Rainy days
0
Snow days
22°/12°
Temperatures
14 km/h
Avg max wind
78 %
Avg humidity
Onondaga County Weather September
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Temperatures trend during September in Onondaga County
See the weather trend as well as the moving average line
September weather in Onondaga County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain shower | 26° /14° | 33.2 mm | 4 | |
| Sept. 2 | Patchy rain possible | 23° /13° | 169.1 mm | 4 | |
| Sept. 3 |  Partly cloudy | 23° /13° | 1.5 mm | 4 | |
| Sept. 4 |  Sunny | 24° /13° | 31.6 mm | 6 | |
| Sept. 5 | Sunny | 24° /12° | 0 mm | 6 | |
| Sept. 6 | Partly cloudy | 23° /12° | 8.4 mm | 6 | |
| Sept. 7 | Light rain shower | 21° /10° | 7.4 mm | 5 | |
| Sept. 8 | Patchy rain possible | 20° /9° | 0.1 mm | 4 | |
| Sept. 9 |  Moderate or heavy rain with thunder | 22° /11° | 11 mm | 4 | |
| Sept. 10 |  Mist | 22° /12° | 0.1 mm | 5 | |
| Sept. 11 |  Overcast | 23° /10° | 0 mm | 5 | |
| Sept. 12 | Partly cloudy | 25° /12° | 1.6 mm | 6 | |
| Sept. 13 | Sunny | 24° /15° | 9.1 mm | 4 | |
| Sept. 14 | Sunny | 22° /13° | 0.1 mm | 6 | |
| Sept. 15 |  Moderate rain at times | 23° /12° | 0.7 mm | 5 | |
| Sept. 16 | Partly cloudy | 25° /14° | 0 mm | 5 | |
| Sept. 17 | Overcast | 22° /17° | 1.1 mm | 2 | |
| Sept. 18 | Overcast | 20° /11° | 0 mm | 5.3 | |
| Sept. 19 | Overcast | 18° /7° | 1.6 mm | 5.6 | |
| Sept. 20 | Light rain shower | 16° /10° | 25.1 mm | 0.6 | |
| Sept. 21 | Overcast | 16° /6° | 0 mm | 4 | |
| Sept. 22 | Light rain shower | 14° /11° | 47.2 mm | 3 | |
| Sept. 23 | Light rain shower | 16° /11° | 3.9 mm | 5 | |
| Sept. 24 | Overcast | 18° /12° | 15.9 mm | 4 | |
| Sept. 25 | Patchy rain possible | 13° /9° | 2.3 mm | 3 | |
| Sept. 26 | Sunny | 13° /7° | 0 mm | 4 | |
| Sept. 27 | Sunny | 19° /9° | 0 mm | 5 | |
| Sept. 28 | Sunny | 21° /12° | 0 mm | 6 | |
| Sept. 29 | Overcast | 21° /13° | 0 mm | 6 | |
| Sept. 30 | Light rain shower | 16° /10° | 2.7 mm | 3 | |
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Important Notice
Our weather forecast for Onondaga 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 Onondaga County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Onondaga County in September - FAQ
What are the expected maximum and minimum temperatures in Onondaga County 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 Onondaga County during September?
Significant rainfall exceeding 160.9 mm is expected in Onondaga County during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Onondaga County during September?
The average wind speed in Onondaga County during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Onondaga County
Explore the daily rainfall trends and prepare for Onondaga Countys September weather 💧
Typically, Onondaga County has 10 rainy days in September with a total of 160.9 mm of rainfall.
UV exposure in Onondaga County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Onondaga County?Get accurate weather forecasts for Onondaga County, located at latitude 43.048 and longitude -76.147. Stay updated with localized weather information tailored for Onondaga County.
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