Williamstown (KY)
September
Weather in Williamstown, Kentucky for September 2026
Your guide to Williamstown weather in September - trends and predictions
So far, September 2026 in Williamstown is slightly warmer than the historical average by 1.8 °F.
The forecast for the next days in Williamstown predicts a temperature of 22 °F, which is cooler than the historical average.
In general, the average temperature in Williamstown at the beginning of September is 29.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.7 °F by the end of September.
Williamstown experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 189.7 mm.
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Temperatures
Rain 🌧️
More
23
Dry days
7
Rainy days
0
Snow days
26°/16°
Temperatures
11 km/h
Avg max wind
69 %
Avg humidity
Williamstown Weather September
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Temperatures trend during September in Williamstown
See the weather trend as well as the moving average line
September weather in Williamstown day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Partly cloudy | 32° /17° | 0 mm | 9 | |
| Sept. 2 |  Cloudy | 32° /17° | 0 mm | 9 | |
| Sept. 3 | Cloudy | 31° /18° | 0 mm | 8 | |
| Sept. 4 |  Moderate or heavy rain shower | 30° /19° | 25.9 mm | 6 | |
| Sept. 5 |  Heavy rain at times | 31° /18° | 62.3 mm | 8 | |
| Sept. 6 | Moderate or heavy rain shower | 25° /16° | 18.4 mm | 7 | |
| Sept. 7 |  Fog | 27° /11° | 0 mm | 8 | |
| Sept. 8 |  Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 9 |  Overcast | 28° /16° | 0.9 mm | 8 | |
| Sept. 10 | Partly cloudy | 27° /16° | 50.2 mm | 5 | |
| Sept. 11 | Overcast | 26° /17° | 3.6 mm | 5 | |
| Sept. 12 | Sunny | 27° /17° | 14.5 mm | 4 | |
| Sept. 13 | Sunny | 30° /17° | 0.2 mm | 7 | |
| Sept. 14 | Overcast | 29° /16° | 0 mm | 7 | |
| Sept. 15 | Overcast | 31° /17° | 0 mm | 7 | |
| Sept. 16 | Cloudy | 31° /21° | 1.1 mm | 5 | |
| Sept. 17 | Cloudy | 31° /19° | 0.1 mm | 7 | |
| Sept. 18 | Overcast | 30° /19° | 4.2 mm | 5 | |
| Sept. 19 | Partly cloudy | 32° /18° | 7.1 mm | 4 | |
| Sept. 20 | Overcast | 31° /19° | 1.7 mm | 5 | |
| Sept. 21 |  Thundery outbreaks possible | 26° /17° | 0.8 mm | 4 | |
| Sept. 22 | Thundery outbreaks possible | 24° /15° | 5.3 mm | 3 | |
| Sept. 23 | Moderate or heavy rain shower | 22° /16° | 14.9 mm | 3 | |
| Sept. 24 | Moderate or heavy rain shower | 22° /17° | 24.9 mm | 2 | |
| Sept. 25 |  Moderate rain | 22° /12° | 3.8 mm | 5 | |
| Sept. 26 | Fog | 21° /13° | 0 mm | 5 | |
| Sept. 27 | Sunny | 23° /9° | 0 mm | 6 | |
| Sept. 28 | Sunny | 23° /12° | 0 mm | 6 | |
| Sept. 29 | Sunny | 26° /12° | 0 mm | 6.2 | |
| Sept. 30 | Overcast | 29° /14° | 0 mm | 5.8 | |
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Important Notice
Our weather forecast for Williamstown 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 Williamstown forecast closer to your planned date for the most up-to-date weather information.
Change Month
Williamstown in September - FAQ
What are the expected maximum and minimum temperatures in Williamstown during September?
During September, expect a variety of temperatures with highs around 26° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Williamstown during September?
Significant rainfall exceeding 189.7 mm is expected in Williamstown during September, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Williamstown during September?
The average wind speed in Williamstown during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Williamstown
Explore the daily rainfall trends and prepare for Williamstowns September weather 💧
Typically, Williamstown has 7 rainy days in September with a total of 189.7 mm of rainfall.
UV exposure in Williamstown during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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