Allentown (PA)
September
Weather in Allentown, Pennsylvania for September 2027
Your guide to Allentown weather in September - trends and predictions
In general, the average temperature in Allentown at the beginning of September is 25.5 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.7 °C by the end of September.
Allentown experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 167.6 mm.
Is September a good time to visit Allentown? check out the best time to travel to Allentown page.
✨ Is September a good time to visit Allentown? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
21
Dry days
9
Rainy days
0
Snow days
23°/14°
Temperatures
14 km/h
Avg max wind
75 %
Avg humidity
Allentown Weather September
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Temperatures trend during September in Allentown
See the weather trend as well as the moving average line
September weather in Allentown day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Patchy rain possible | 28° /17° | 2 mm | 6 | |
| Sept. 2 |  Overcast | 23° /16° | 0.7 mm | 4 | |
| Sept. 3 |  Heavy rain | 25° /13° | 31.4 mm | 4 | |
| Sept. 4 |  Light rain | 26° /15° | 3.5 mm | 6 | |
| Sept. 5 | Light rain | 27° /16° | 7.9 mm | 6 | |
| Sept. 6 | Overcast | 26° /15° | 0 mm | 6 | |
| Sept. 7 |  Moderate or heavy rain shower | 23° /12° | 9.9 mm | 6 | |
| Sept. 8 |  Sunny | 23° /10° | 0 mm | 6 | |
| Sept. 9 |  Partly cloudy | 25° /12° | 0.1 mm | 5 | |
| Sept. 10 | Sunny | 25° /14° | 0.6 mm | 5 | |
| Sept. 11 | Sunny | 26° /14° | 0 mm | 6 | |
| Sept. 12 | Sunny | 25° /13° | 0 mm | 6 | |
| Sept. 13 |  Moderate rain | 25° /15° | 19.8 mm | 5 | |
| Sept. 14 | Partly cloudy | 26° /14° | 0 mm | 7 | |
| Sept. 15 | Partly cloudy | 24° /13° | 0 mm | 6 | |
| Sept. 16 | Overcast | 25° /13° | 0 mm | 5 | |
| Sept. 17 | Patchy rain possible | 24° /15° | 1.3 mm | 4 | |
| Sept. 18 | Patchy rain possible | 24° /16° | 0.1 mm | 6 | |
| Sept. 19 | Light rain | 25° /15° | 2.5 mm | 5 | |
| Sept. 20 | Light rain | 21° /14° | 6.5 mm | 4 | |
| Sept. 21 | Overcast | 22° /14° | 0.1 mm | 4 | |
| Sept. 22 | Light rain | 20° /13° | 2.6 mm | 4 | |
| Sept. 23 | Moderate or heavy rain shower | 20° /13° | 5.2 mm | 4 | |
| Sept. 24 | Moderate rain | 21° /13° | 13.3 mm | 4 | |
| Sept. 25 | Moderate rain | 21° /14° | 23.5 mm | 3 | |
| Sept. 26 | Moderate rain | 21° /16° | 12.8 mm | 4 | |
| Sept. 27 | Moderate or heavy rain shower | 20° /14° | 9.9 mm | 4 | |
| Sept. 28 | Moderate rain | 20° /15° | 13.7 mm | 3 | |
| Sept. 29 | Overcast | 20° /14° | 0.2 mm | 4 | |
| Sept. 30 |  Mist | 22° /14° | 0.1 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Allentown 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 Allentown forecast closer to your planned date for the most up-to-date weather information.
Change Month
Allentown in September - FAQ
What are the expected maximum and minimum temperatures in Allentown during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Allentown during September?
Significant rainfall exceeding 167.6 mm is expected in Allentown during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Allentown during September?
The average wind speed in Allentown during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Allentown
Explore the daily rainfall trends and prepare for Allentowns September weather 💧
Typically, Allentown has 9 rainy days in September with a total of 167.6 mm of rainfall.
UV exposure in Allentown during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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