Guerneville Weather Forecast
- 50
- 57
Rain
- 51
- 55
Rain
- 50
- 57
Rain
- 47
- 56
Rain
- 44
- 52
Rain
- 46
- 53
Rain
- 44
- 53
Rain
Today 19 Dec North Bay Interior Valleys
Rain. Highs in the mid 50s to lower 60s. South Winds 10 to 20 Mph.
Tonight 19 Dec North Bay Interior Valleys
Patchy fog in the Evening, then Areas of fog after midnight. Rain in the Evening, then a chance of rain after midnight. Lows in the upper 40s to mid 50s. Southwest Winds 5 to 15 Mph.
Guerneville Temperature Statistics
December Temperature
Santa Rosa, Santa Rosa Sonoma County Airport (9.3 miles)
Lowest 4 December, 2025
34 °FAverage December
44.7 °FHighest 3 December, 2025
68 °F
Climate (2020–Present)
Santa Rosa, Santa Rosa Sonoma County Airport (9.3 miles)
Average Low 2020–2025
45.5 °FAverage 2020–2025
57.9 °FAverage High 2020–2025
72.5 °F