Union County, TN Weather Tomorrow

See tomorrow's forecast for Union County together with a reliable 5 day outlook featuring precipitation probability, daily and nightly weather conditions, high and low temperature trends, sunrise and sunset information, sky cover, wind speed, wind direction, and wind chill for the Union County area.
Updated: Mon Aug 31st 2026 6:15 PM EDT
Union County, TN Weather – 8-31 – Sunny
93° / 65°
Sunny
Daytime highs will reach 93°F with lows dropping to 65°F in Union County, where it will be sunny. There's a very small chance of rainfall, only about 3%. Winds will be light at 6mph and gusts of 8.3mph at 7 PM. The humidity will be on the higher side, averaging about 62%, the maximum being 46% at 11 PM and 42% being its lowest at 7 PM. Barometric pressure is its highest of 30.08inHg at 11 PM, a lowest point of 30.04inHg at 7 PM with an avg 30.06inHg.
Union County, TN Weather – 9-1 – Sunny
91° / 72°

Weather Tomorrow

Sunny
It will be sunny in Union County, with a high of 91°F and a low of 72°F. There's a very small chance of rainfall, only about 4%. Winds will be light at 6mph and gusts of 14.1mph at 6 PM. The humidity will be on the higher side, averaging about 65%, the maximum being 86% at 7 AM and 39% being its lowest at 4 PM. Barometric pressure is its highest of 30.13inHg at 9 AM, a lowest point of 30.01inHg at 5 PM with an avg 30.07inHg.
Union County, TN Weather – 9-2 – Sunny
93° / 74°
Sunny
Union County could see a sunny day with daytime highs of 93°F and nighttime lows near 74°F. There's a very small chance of rainfall, only about 4%. Winds will be light at 7mph and gusts of 15mph at 9 PM. The humidity will be on the higher side, averaging about 64%, the maximum being 84% at 11 PM and 36% being its lowest at 5 PM. Barometric pressure is its highest of 30.11inHg at 10 AM, a lowest point of 29.98inHg at 7 PM with an avg 30.05inHg.
Union County, TN Weather – 9-3 – Sunny
93° / 72°
Sunny
Sunshine is in the forecast for Union County, with a high of 93°F and a low of 72°F. Rainfall predicted to have a 57% chance with an estimated 0.08in. Winds will be light at 10mph and gusts of 18.7mph at 7 PM. The humidity will be on the higher side, averaging about 72%, the maximum being 96% at 11 PM and 39% being its lowest at 5 PM. Barometric pressure is its highest of 30.07inHg at 8 AM, a lowest point of 29.94inHg at 6 PM with an avg 30.03inHg.
Union County, TN Weather – 9-4 – Sunny
91° / 70°
Sunny
Highs will reach 91°F with lows near 70°F in Union County, where a sunny day is. There's a moderate 36% chance of rainfall with an estimated 0.01in. Winds will be light at 6mph and gusts of 15.9mph at 11 PM. The humidity will be on the higher side, averaging about 75%, the maximum being 96% at 7 AM and 43% being its lowest at 5 PM. Barometric pressure is its highest of 30.08inHg at 9 AM, a lowest point of 29.93inHg at 7 PM with an avg 30.02inHg.
Union County, TN Weather – 9-5 – Sunny
88° / 72°
Sunny
Sunshine is in the forecast for Union County, with a high of 88°F and a low of 72°F. Rainfall predicted to have a 57% chance with an estimated 0.05in. Winds will be light at 5mph and gusts of 15.1mph at 12 AM. The humidity will be on the higher side, averaging about 76%, the maximum being 98% at 7 AM and 44% being its lowest at 5 PM. Barometric pressure is its highest of 30.01inHg at 8 AM, a lowest point of 29.89inHg at 8 PM with an avg 29.96inHg.

Currently

Sunny 89°F
30.04 inHg.
Barometer
39%
Humidity
SE 8.6 mph
Wind
Sunny

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