Barnstable County (Hyannis)
September
Weather in Barnstable County, Massachusetts for September 2027
Your guide to Barnstable County weather in September - trends and predictions
Barnstable County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 395.6 mm.
Is September a good time to visit Barnstable County? check out the best time to travel to Barnstable County page.
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Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
20°/16°
Temperatures
23 km/h
Avg max wind
80 %
Avg humidity
Barnstable County Weather September
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Temperatures trend during September in Barnstable County
See the weather trend as well as the moving average line
September weather in Barnstable County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Heavy rain | 22° /17° | 95.4 mm | 5 | |
| Sept. 2 |  Partly cloudy | 22° /15° | 0 mm | 6 | |
| Sept. 3 | Heavy rain | 22° /16° | 159.6 mm | 2 | |
| Sept. 4 |  Mist | 23° /17° | 0 mm | 4 | |
| Sept. 5 |  Overcast | 22° /17° | 0 mm | 4 | |
| Sept. 6 |  Moderate rain | 22° /18° | 10.9 mm | 2 | |
| Sept. 7 |  Light rain | 23° /14° | 3.4 mm | 4 | |
| Sept. 8 | Overcast | 23° /14° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 23° /17° | 0.3 mm | 4 | |
| Sept. 10 | Overcast | 23° /19° | 0 mm | 1 | |
| Sept. 11 | Overcast | 24° /17° | 0 mm | 6 | |
| Sept. 12 |  Cloudy | 22° /14° | 0 mm | 7 | |
| Sept. 13 | Heavy rain | 21° /16° | 25.6 mm | 4 | |
| Sept. 14 | Overcast | 21° /17° | 0.8 mm | 5 | |
| Sept. 15 | Fog | 18° /15° | 0 mm | 4 | |
| Sept. 16 | Fog | 18° /14° | 0 mm | 3 | |
| Sept. 17 | Fog | 20° /16° | 0.1 mm | 3 | |
| Sept. 18 | Overcast | 21° /18° | 0.6 mm | 3 | |
| Sept. 19 | Mist | 21° /15° | 0 mm | 2 | |
| Sept. 20 | Light rain | 19° /13° | 2.5 mm | 3 | |
| Sept. 21 | Light rain | 18° /15° | 4.4 mm | 3 | |
| Sept. 22 |  Heavy rain at times | 19° /16° | 7 mm | 3 | |
| Sept. 23 | Overcast | 19° /15° | 0 mm | 4 | |
| Sept. 24 | Light rain | 18° /16° | 4.8 mm | 3 | |
| Sept. 25 | Moderate rain | 18° /16° | 14.9 mm | 1 | |
| Sept. 26 | Heavy rain | 20° /16° | 35.7 mm | 2 | |
| Sept. 27 | Moderate rain | 20° /17° | 19.8 mm | 3 | |
| Sept. 28 | Moderate rain | 19° /17° | 9.7 mm | 2 | |
| Sept. 29 | Partly cloudy | 19° /16° | 0.1 mm | 3 | |
| Sept. 30 | Overcast | 19° /16° | 0 mm | 1 | |
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Important Notice
Our weather forecast for Barnstable 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 Barnstable County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Barnstable County in September - FAQ
What are the expected maximum and minimum temperatures in Barnstable County during September?
During September, expect a variety of temperatures with highs around 20° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Barnstable County during September?
Significant rainfall exceeding 395.6 mm is expected in Barnstable County during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Barnstable County during September?
The average wind speed in Barnstable County during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Barnstable County
Explore the daily rainfall trends and prepare for Barnstable Countys September weather 💧
Typically, Barnstable County has 9 rainy days in September with a total of 395.6 mm of rainfall.
UV exposure in Barnstable County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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