Harrisburg (PA)
September
Weather in Harrisburg, Pennsylvania for September 2026
Your guide to Harrisburg weather in September - trends and predictions
So far, September 2026 in Harrisburg shows a warmer trend than usual by 3.6 °F.
Expect cooler weather in the next days in Harrisburg with the forecast suggesting a temperature of 24.4 °F, lower than the historical average.
In general, the average temperature in Harrisburg at the beginning of September is 26.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.4 °F by the end of September.
The climate of Harrisburg in September is notably wet, with an average of 11 rainy days, and a total of 134.9 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
24°/15°
Temperatures
13 km/h
Avg max wind
72 %
Avg humidity
Harrisburg Weather September
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Temperatures trend during September in Harrisburg
See the weather trend as well as the moving average line
September weather in Harrisburg day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Fog | 29° /18° | 0.4 mm | 5 | |
| Sept. 2 |  Partly cloudy | 25° /16° | 49.9 mm | 5 | |
| Sept. 3 |  Sunny | 27° /15° | 10.2 mm | 4 | |
| Sept. 4 |  Cloudy | 28° /15° | 17 mm | 6 | |
| Sept. 5 | Sunny | 27° /15° | 1.5 mm | 6 | |
| Sept. 6 |  Light rain shower | 26° /15° | 0.4 mm | 6 | |
| Sept. 7 |  Patchy light rain | 23° /13° | 1.8 mm | 6 | |
| Sept. 8 | Sunny | 24° /9° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 28° /12° | 0.1 mm | 6 | |
| Sept. 10 | Patchy rain possible | 30° /19° | 11.8 mm | 7.1 | |
| Sept. 11 | Sunny | 25° /18° | 0.3 mm | 5.5 | |
| Sept. 12 |  Overcast | 25° /15° | 0 mm | 3 | |
| Sept. 13 | Overcast | 25° /19° | 0.2 mm | 5.4 | |
| Sept. 14 | Overcast | 28° /20° | 5.8 mm | 6 | |
| Sept. 15 | Sunny | 32° /22° | 0 mm | 8 | |
| Sept. 16 | Sunny | 29° /20° | 0 mm | 7 | |
| Sept. 17 | Sunny | 27° /15° | 0 mm | 7 | |
| Sept. 18 | Sunny | 21° /12° | 2.4 mm | 6 | |
| Sept. 19 | Sunny | 18° /8° | 0 mm | 5 | |
| Sept. 20 | Sunny | 19° /8° | 0 mm | 5 | |
| Sept. 21 | Sunny | 22° /8° | 0 mm | 6 | |
| Sept. 22 | Sunny | 24° /11° | 0 mm | 6 | |
| Sept. 23 | Overcast | 17° /13° | 0 mm | 4 | |
| Sept. 24 | Fog | 21° /17° | 13.7 mm | 5 | |
| Sept. 25 |  Moderate or heavy rain shower | 23° /17° | 21.1 mm | 5 | |
| Sept. 26 | Light rain shower | 25° /17° | 7 mm | 6 | |
| Sept. 27 | Fog | 23° /15° | 0 mm | 5 | |
| Sept. 28 | Moderate rain at times | 22° /17° | 18.8 mm | 5 | |
| Sept. 29 |  Heavy rain at times | 22° /17° | 16 mm | 5 | |
| Sept. 30 |  Moderate rain | 21° /14° | 22.5 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Harrisburg 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 Harrisburg forecast closer to your planned date for the most up-to-date weather information.
Change Month
Harrisburg in September - FAQ
What are the expected maximum and minimum temperatures in Harrisburg during September?
During September, expect a variety of temperatures with highs around 24° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Harrisburg during September?
Significant rainfall exceeding 134.9 mm is expected in Harrisburg during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Harrisburg during September?
The average wind speed in Harrisburg during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Harrisburg
Explore the daily rainfall trends and prepare for Harrisburgs September weather 💧
Typically, Harrisburg has 11 rainy days in September with a total of 134.9 mm of rainfall.
UV exposure in Harrisburg during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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