Climate
Rockville weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: April, May, August, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 42°F | 27°F | 3.1 in | 10 |
| February | 45°F | 28°F | 2.6 in | 8 |
| March | 54°F | 36°F | 3.7 in | 11 |
| April | 66°F | 46°F | 3.2 in | 10 |
| May | 74°F | 55°F | 3.5 in | 11 |
| June | 82°F | 64°F | 4.0 in | 10 |
| July | 87°F | 69°F | 4.0 in | 10 |
| August | 85°F | 67°F | 3.0 in | 7 |
| September | 78°F | 60°F | 4.0 in | 10 |
| October | 66°F | 48°F | 3.5 in | 8 |
| November | 56°F | 38°F | 3.3 in | 8 |
| December | 46°F | 31°F | 3.4 in | 9 |
NOAA U.S. Climate Normals 1991–2020, Rockville 1 Ne, Md Us (1.2 mi away, 440 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in Rockville?
July, with an average high of 87°F and low of 69°F.
What is the coldest month in Rockville?
January, with an average low of 27°F and high of 42°F.
When does it rain most in Rockville?
June is the wettest month, averaging 4.0 in of precipitation; the year totals about 41.3 inches.
What is the best time to visit Rockville?
For mild weather (highs between 65°F and 85°F) with the least rain, April, May, August.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the Rockville 1 Ne weather station, 1.2 miles from downtown: 30-year averages, not a forecast.