Grenville Weather Forecast
- 32
- 64
Mostly Sunny
- 31
- 64
Breezy
- 31
- 48
Partly Sunny
- 42
- 69
Mostly Cloudy
- 35
- 68
Partly Sunny
- 38
- 63
Partly Sunny
Today 16 Dec Union County
Mostly sunny. Highs in the mid 60s. North Winds around 15 Mph.
Tonight 16 Dec Union County
Cold. Mostly clear. Lows in the lower 30s.
Grenville Temperature Statistics
December Temperature
Clayton Municipal Airpark (27.3 miles)
Lowest 1 December, 2025
19 °FAverage December
40.8 °FHighest 11 December, 2025
80.1 °F
Climate (2020–Present)
Clayton Municipal Airpark (27.3 miles)
Average Low 2020–2025
42.5 °FAverage 2020–2025
55.7 °FAverage High 2020–2025
69.5 °F