Guerneville Weather Forecast
- 53
- 80
Becoming Sunny
- 57
- 87
Mostly Sunny
- 61
- 93
Mostly Sunny
- 57
- 94
Mostly Sunny
- 55
- 85
Mostly Sunny
- 55
- 84
Mostly Sunny
Today 6 Aug North Bay Interior Valleys
Partly cloudy in the morning then becoming sunny. Areas of fog in the morning. Highs in the upper 70s to lower 90s. Southwest Winds 5 to 15 Mph.
Tonight 6 Aug North Bay Interior Valleys
Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 40s to lower 60s. Southwest Winds 5 to 15 Mph.
Guerneville Temperature Statistics
August Temperature
Santa Rosa, Santa Rosa Sonoma County Airport (9.3 miles)
Lowest 1 August, 2026
50.6 °FAverage August
73.6 °FHighest 1 August, 2026
98.7 °F
Climate (2021–2026)
Santa Rosa, Santa Rosa Sonoma County Airport (9.3 miles)
Average Low 2021–2026
45.9 °FAverage 2021–2026
58.6 °FAverage High 2021–2026
72.8 °F