Penobscot County (Bangor)
September
Weather in Penobscot County, Maine for September 2026
Your guide to Penobscot County weather in September - trends and predictions
Until now, September 2026 in Penobscot County is slightly cooler than the historical average by 0.6 °F.
The forecast for the next days in Penobscot County predicts temperatures to be around 16 °F, close to the historical average.
In general, the average temperature in Penobscot County at the beginning of September is 22.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.3 °F by the end of September.
Penobscot County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 137.8 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
24
Dry days
6
Rainy days
0
Snow days
21°/11°
Temperatures
13 km/h
Avg max wind
73 %
Avg humidity
Penobscot County Weather September
Move between months or click on a day
Temperatures trend during September in Penobscot County
See the weather trend as well as the moving average line
September weather in Penobscot County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Heavy rain at times | 25° /12° | 2.5 mm | 6 | |
| Sept. 2 |  Overcast | 23° /11° | 0 mm | 5 | |
| Sept. 3 |  Sunny | 21° /11° | 53.4 mm | 4 | |
| Sept. 4 |  Cloudy | 21° /12° | 6.4 mm | 4 | |
| Sept. 5 | Sunny | 22° /13° | 0.1 mm | 5 | |
| Sept. 6 |  Patchy rain possible | 21° /12° | 0.1 mm | 5 | |
| Sept. 7 | Patchy rain possible | 22° /10° | 8.7 mm | 5 | |
| Sept. 8 | Overcast | 22° /10° | 0.8 mm | 4 | |
| Sept. 9 |  Partly cloudy | 20° /7° | 0.5 mm | 4 | |
| Sept. 10 | Partly cloudy | 23° /11° | 6 mm | 5 | |
| Sept. 11 | Partly cloudy | 23° /8° | 0 mm | 5 | |
| Sept. 12 | Sunny | 24° /8° | 0 mm | 6 | |
| Sept. 13 | Patchy rain possible | 22° /10° | 3.5 mm | 4 | |
| Sept. 14 | Overcast | 23° /11° | 0 mm | 5 | |
| Sept. 15 | Sunny | 23° /10° | 0 mm | 6 | |
| Sept. 16 | Sunny | 26° /12° | 0 mm | 6 | |
| Sept. 17 | Overcast | 25° /12° | 1.6 mm | 4 | |
| Sept. 18 | Overcast | 23° /11° | 1.6 mm | 5 | |
| Sept. 19 | Overcast | 21° /9° | 0 mm | 5 | |
| Sept. 20 | Overcast | 16° /6° | 5.9 mm | 3.6 | |
| Sept. 21 | Sunny | 18° /5° | 0.6 mm | 5 | |
| Sept. 22 | Overcast | 16° /4° | 0 mm | 3.8 | |
| Sept. 23 | Sunny | 18° /3° | 0 mm | 4.7 | |
| Sept. 24 | Sunny | 20° /3° | 3.4 mm | 5 | |
| Sept. 25 | Light rain shower | 11° /7° | 17.4 mm | 3 | |
| Sept. 26 | Light rain shower | 12° /10° | 12.9 mm | 3 | |
| Sept. 27 | Overcast | 11° /9° | 0.4 mm | 3 | |
| Sept. 28 | Sunny | 21° /7° | 0 mm | 6 | |
| Sept. 29 | Overcast | 19° /10° | 0 mm | 5 | |
| Sept. 30 |  Fog | 13° /11° | 1.2 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Penobscot 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 Penobscot County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Penobscot County in September - FAQ
What are the expected maximum and minimum temperatures in Penobscot County during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Penobscot County during September?
Significant rainfall exceeding 137.8 mm is expected in Penobscot County during September, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Penobscot County during September?
The average wind speed in Penobscot County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Penobscot County
Explore the daily rainfall trends and prepare for Penobscot Countys September weather 💧
Typically, Penobscot County has 6 rainy days in September with a total of 137.8 mm of rainfall.
UV exposure in Penobscot County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Penobscot County
Select a location for an accurate weather forecast
More Locations Quick links
More Penobscot County weather pages
You are here
Where is Penobscot County?Get accurate weather forecasts for Penobscot County, located at latitude 44.799 and longitude -68.773. Stay updated with localized weather information tailored for Penobscot County.
Found a mistake?
We appreciate your attention to details. Tell us here.