Gaithersburg (MD)
September
Weather in Gaithersburg, Maryland for September 2026
Your guide to Gaithersburg weather in September - trends and predictions
In general, the average temperature in Gaithersburg at the beginning of September is 26.6 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 24.1 °F by the end of September.
The climate of Gaithersburg in September is notably wet, with an average of 11 rainy days, and a total of 240.9 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
25°/16°
Temperatures
13 km/h
Avg max wind
71 %
Avg humidity
Gaithersburg Weather September
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Temperatures trend during September in Gaithersburg
See the weather trend as well as the moving average line
September weather in Gaithersburg day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 24° /14° | 0 mm | 7 | |
| Sept. 2 | Overcast | 24° /15° | 0 mm | 8 | |
| Sept. 3 |  Cloudy | 23° /17° | 0 mm | 7 | |
| Sept. 4 |  Partly cloudy | 30° /19° | 26.3 mm | 9 | |
| Sept. 5 |  Mist | 32° /18° | 4.9 mm | 9 | |
| Sept. 6 |  Moderate or heavy rain shower | 31° /20° | 108.8 mm | 7 | |
| Sept. 7 | Overcast | 22° /15° | 0 mm | 4 | |
| Sept. 8 |  Sunny | 23° /10° | 0 mm | 8 | |
| Sept. 9 | Partly cloudy | 22° /11° | 0 mm | 8 | |
| Sept. 10 | Overcast | 22° /12° | 0 mm | 4 | |
| Sept. 11 | Cloudy | 24° /16° | 0 mm | 6 | |
| Sept. 12 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 27° /17° | 0 mm | 7 | |
| Sept. 14 | Overcast | 29° /18° | 0 mm | 7 | |
| Sept. 15 | Cloudy | 28° /18° | 1.5 mm | 7 | |
| Sept. 16 | Overcast | 21° /16° | 0 mm | 3 | |
| Sept. 17 | Moderate or heavy rain shower | 17° /14° | 19 mm | 1 | |
| Sept. 18 | Mist | 28° /17° | 0 mm | 5 | |
| Sept. 19 | Sunny | 31° /16° | 4.7 mm | 6 | |
| Sept. 20 | Overcast | 19° /16° | 10.7 mm | 1 | |
| Sept. 21 | Overcast | 22° /17° | 0 mm | 2 | |
| Sept. 22 | Partly cloudy | 26° /13° | 0 mm | 6 | |
| Sept. 23 | Moderate rain at times | 30° /19° | 10 mm | 5 | |
| Sept. 24 | Mist | 27° /18° | 0 mm | 5 | |
| Sept. 25 | Moderate or heavy rain shower | 26° /17° | 31.6 mm | 1 | |
| Sept. 26 | Mist | 26° /19° | 10.1 mm | 3 | |
| Sept. 27 | Overcast | 23° /15° | 0 mm | 3 | |
| Sept. 28 | Mist | 18° /16° | 13.3 mm | 1 | |
| Sept. 29 | Fog | 25° /15° | 0 mm | 1 | |
| Sept. 30 | Overcast | 24° /17° | 0 mm | 1 | |
| Next | |||||
Important Notice
Our weather forecast for Gaithersburg 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 Gaithersburg forecast closer to your planned date for the most up-to-date weather information.
Change Month
Gaithersburg in September - FAQ
What are the expected maximum and minimum temperatures in Gaithersburg during September?
During September, expect a variety of temperatures with highs around 25° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Gaithersburg during September?
Significant rainfall exceeding 240.9 mm is expected in Gaithersburg during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Gaithersburg during September?
The average wind speed in Gaithersburg during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Gaithersburg
Explore the daily rainfall trends and prepare for Gaithersburgs September weather 💧
Typically, Gaithersburg has 11 rainy days in September with a total of 240.9 mm of rainfall.
UV exposure in Gaithersburg during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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