St. Mary's County weather, town by town
11 places in St. Mary's County, Maryland, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
St. Mary's County Weather Facts
St. Mary's County has 11 places on myweatherrock (10 census-designated places, 1 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 104°F at Solomons on August 7, 1918. The coldest night is -9°F at Mechanicsville 5 Ne on February 5, 1996. The wettest day brought 11.85 inches of rain at Solomons on July 23, 1969. The biggest single-day snow measured 20.98 inches at Mechanicsville 5 Ne on February 19, 1979. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is California, about 13 square miles.
About St. Mary's County weather
The map on the Now tab shows every St. Mary's County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 11 St. Mary's County towns with station normals, the warmest month is July, when the day usually reaches 87°F, and the coldest is January, when the night usually falls to 28°F. May is the wettest, with rain on about 11 days. July afternoons run from about 85°F in Charlotte Hall to 88°F in California. January nights run from about 26°F in Charlotte Hall to 29°F in California.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
St. Mary's County weather records
Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Common questions about St. Mary's County weather
- What is the hottest temperature recorded at a St. Mary's County station?
- 104°F at Solomons on August 7, 1918, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a St. Mary's County station?
- -9°F at Mechanicsville 5 Ne on February 5, 1996.
- What is the most rain a St. Mary's County station has measured in one day?
- 11.85 inches at Solomons on July 23, 1969.
- What is the biggest one-day snowfall at a St. Mary's County station?
- 20.98 inches at Mechanicsville 5 Ne on February 19, 1979.
- How many St. Mary's County towns have a weather page here?
- 11: 10 census-designated places, 1 towns. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the St. Mary's County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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