Grayson County weather, town by town
18 places in Grayson County, Texas, 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 1897 to 2026. Station extremes, not official state records.
Grayson County Weather Facts
Grayson County has 18 places on myweatherrock (10 cities, 6 towns, 2 census-designated places), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 118°F at Mckinney Muni Ap on August 10, 1936. The coldest night is -7°F at Gainesville 5 Ene on December 23, 1989. The wettest day brought 13.3 inches of rain at Bonham 3Nne on July 3, 1903. The biggest single-day snow measured 10 inches at Madill on December 25, 1975. Those are station measurements from NOAA's daily records, 1897 to 2026, not official state records. By area the largest place is Sherman, about 46 square miles.
About Grayson County weather
The map on the Now tab shows every Grayson 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 18 Grayson County towns with station normals, the warmest month is August, when the day usually reaches 94°F, and the coldest is January, when the night usually falls to 33°F. May is the wettest, with rain on about 9 days.
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.
Grayson County weather records
Measured at the NOAA stations serving these towns, daily records 1897 to 2026. Station extremes, not official state records.
Common questions about Grayson County weather
- What is the hottest temperature recorded at a Grayson County station?
- 118°F at Mckinney Muni Ap on August 10, 1936, in the NOAA daily station records myweatherrock holds (1897 to 2026).
- What is the coldest temperature recorded at a Grayson County station?
- -7°F at Gainesville 5 Ene on December 23, 1989.
- What is the most rain a Grayson County station has measured in one day?
- 13.3 inches at Bonham 3Nne on July 3, 1903.
- What is the biggest one-day snowfall at a Grayson County station?
- 10 inches at Madill on December 25, 1975.
- How many Grayson County towns have a weather page here?
- 18: 10 cities, 6 towns, 2 census-designated places. 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 Grayson 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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