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Old Union, TX Weather Forecast
Old Union, TX Weather Forecast Date: 615 PM CDT Thu Sep 10 2026
The area/counties/county of: Limestone, including the cities of: Mexia and Groesbeck.or toggle through each period.
Tonight... Partly cloudy. A 20% chance of showers and thunderstorms this evening. Lows in the mid 70s. South winds around 5 mph.
Friday... Mostly sunny. A 20% chance of showers and thunderstorms in the afternoon. Humid with highs in the upper 90s. South winds around 5 mph.
Friday Night... Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph.
Saturday... Mostly sunny. Hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 106.
Saturday Night... Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph.
Sunday... Sunny. Highs in the upper 90s.
Sunday Night... Mostly clear. Lows in the mid 70s.
Monday... Sunny. Highs in the upper 90s.
Monday Night... Mostly clear. Lows in the mid 70s.
Tuesday... Sunny. Highs in the upper 90s. Heat index values up to 105.
Tuesday Night... Mostly clear. Lows in the lower 70s.
Wednesday... Sunny. Highs in the mid 90s.
Wednesday Night... Mostly clear. Lows in the mid 70s.
POP = Probability of Precipitation
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