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Grayson County, TX Weather Forecast
Grayson County, TX Weather Forecast Date: 207 AM CDT Sun Sep 27 2026
The area/counties/county of: Grayson, including the cities of: Sherman and Denison.or toggle through each period.
Today... Mostly sunny with a 20% chance of showers and thunderstorms. Highs in the mid 90s. South winds 5 to 10 mph.
Tonight... Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the lower 70s. Southeast winds around 5 mph. Chance of rain 40%.
Monday... Mostly sunny with a 20% chance of showers and thunderstorms. Highs in the lower 90s. Southeast winds 5 to 10 mph.
Monday Night... Partly cloudy. Lows in the lower 70s. Southeast winds 5 to 10 mph.
Tuesday... Partly sunny. Highs in the mid 90s. South winds 5 to 10 mph, increasing to 10 to 15 mph in the afternoon.
Tuesday Night... Mostly cloudy. A 30% chance of showers after midnight. Lows in the mid 70s.
Wednesday... Mostly cloudy. A chance of showers in the morning, then showers likely with a slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 60%.
Wednesday Night... Mostly cloudy with showers likely with a chance of thunderstorms. Lows in the lower 70s. Chance of rain 70%.
Thursday... Mostly cloudy with showers likely with a chance of thunderstorms. Highs in the lower 80s. Chance of rain 70%.
Thursday Night... Mostly cloudy with a 50% chance of showers and thunderstorms. Lows in the upper 60s.
Friday... Mostly cloudy in the morning, then becoming partly sunny. A chance of showers with a slight chance of thunderstorms. Highs around 80. Chance of rain 50%.
Friday Night... Partly cloudy with a chance of showers with a slight chance of thunderstorms in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 30%.
POP = Probability of Precipitation
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