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Union County, OH Weather Forecast
Union County, OH Weather Forecast Date: 405 PM EDT Fri Oct 16 2026
The area/counties/county of: Union, including the city of Marysville.or toggle through each period.
Tonight... Mostly cloudy with showers likely this evening, then partly cloudy after midnight. Much cooler with lows in the upper 30s. Northwest winds 10 to 15 mph, becoming north this late evening and overnight. Gusts up to 30 mph. Chance of rain 60%.
Saturday... Partly cloudy in the morning, then clearing. Highs in the lower 50s. North winds 10 to 15 mph. Gusts up to 30 mph in the morning.
Saturday Night... Clear. Areas of frost after midnight. Lows around 30. North winds around 5 mph in the evening, becoming light and variable.
Sunday... Widespread frost in the morning. Sunny. Highs around 60. South winds around 5 mph.
Sunday Night... Clear. Lows in the mid 30s. Southeast winds around 5 mph.
Monday... Sunny. Highs in the mid 60s.
Monday Night... Clear. Lows in the upper 30s.
Tuesday... Mostly sunny. Highs in the upper 60s.
Tuesday Night... Clear. Lows in the lower 40s.
Wednesday... Sunny. Highs around 70.
Wednesday Night... Clear. Lows in the lower 40s.
Thursday... Mostly sunny. Highs around 70.
Thursday Night... Mostly clear. Lows in the mid 40s.
POP = Probability of Precipitation
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