Rockville (MD)
September
Weather in Rockville, Maryland for September 2026
Your guide to Rockville weather in September - trends and predictions
In general, the average temperature in Rockville at the beginning of September is 26.9 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 24.6 °F by the end of September.
The climate of Rockville in September is notably wet, with an average of 11 rainy days, and a total of 299 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
25°/17°
Temperatures
12 km/h
Avg max wind
69 %
Avg humidity
Rockville Weather September
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Temperatures trend during September in Rockville
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September weather in Rockville day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 25° /15° | 0 mm | 6 | |
| Sept. 2 | Overcast | 24° /17° | 0 mm | 5 | |
| Sept. 3 |  Cloudy | 23° /18° | 0 mm | 5 | |
| Sept. 4 |  Partly cloudy | 31° /19° | 21.6 mm | 8 | |
| Sept. 5 |  Mist | 32° /20° | 5 mm | 7 | |
| Sept. 6 |  Moderate or heavy rain shower | 31° /22° | 131.7 mm | 7 | |
| Sept. 7 | Overcast | 22° /17° | 0 mm | 5 | |
| Sept. 8 |  Sunny | 24° /12° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 23° /13° | 0 mm | 6 | |
| Sept. 10 | Overcast | 23° /15° | 0 mm | 5 | |
| Sept. 11 | Cloudy | 25° /16° | 0 mm | 6 | |
| Sept. 12 | Sunny | 28° /15° | 0 mm | 7 | |
| Sept. 13 | Partly cloudy | 27° /18° | 0 mm | 7 | |
| Sept. 14 | Cloudy | 29° /20° | 0 mm | 6 | |
| Sept. 15 | Cloudy | 28° /20° | 0 mm | 6 | |
| Sept. 16 | Overcast | 21° /17° | 0 mm | 5 | |
| Sept. 17 |  Light rain shower | 17° /15° | 38.5 mm | 4 | |
| Sept. 18 |  Light rain | 28° /18° | 4 mm | 6 | |
| Sept. 19 | Sunny | 32° /17° | 4.8 mm | 8 | |
| Sept. 20 | Overcast | 20° /17° | 17.8 mm | 5 | |
| Sept. 21 | Overcast | 22° /17° | 0 mm | 5 | |
| Sept. 22 | Partly cloudy | 26° /14° | 0 mm | 7 | |
| Sept. 23 |  Thundery outbreaks possible | 30° /19° | 19.7 mm | 7 | |
| Sept. 24 | Cloudy | 27° /18° | 0 mm | 6 | |
| Sept. 25 | Moderate or heavy rain shower | 26° /19° | 27.8 mm | 6 | |
| Sept. 26 | Mist | 26° /20° | 16.9 mm | 6 | |
| Sept. 27 | Overcast | 24° /17° | 0 mm | 5 | |
| Sept. 28 | Overcast | 19° /17° | 11.2 mm | 4 | |
| Sept. 29 | Fog | 26° /16° | 0 mm | 6 | |
| Sept. 30 | Overcast | 24° /18° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Rockville 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 Rockville forecast closer to your planned date for the most up-to-date weather information.
Change Month
Rockville in September - FAQ
What are the expected maximum and minimum temperatures in Rockville during September?
During September, expect a variety of temperatures with highs around 25° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Rockville during September?
Significant rainfall exceeding 299 mm is expected in Rockville during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Rockville during September?
The average wind speed in Rockville during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Rockville
Explore the daily rainfall trends and prepare for Rockvilles September weather 💧
UV exposure in Rockville during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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