Steamboat Slough Weather Forecast
- 55
- 80
Becoming Sunny
- 53
- 79
Partly Sunny
- 53
- 81
Mostly Sunny
- 54
- 83
Mostly Sunny
- 55
- 86
Mostly Sunny
- 55
- 85
Mostly Sunny
Today 26 Aug North Bay Interior Valleys
Partly cloudy in the morning then becoming sunny. Patchy dense fog in the morning. Highs in the lower 70s to mid 80s. Southwest Winds 10 to 20 Mph.
Tonight 26 Aug North Bay Interior Valleys
Mostly clear in the evening then becoming partly cloudy. Patchy fog after midnight. Lows in the 50s. Southwest Winds 10 to 20 Mph.
Steamboat Slough Temperature Statistics
August Temperature
Napa, Napa County Airport (7.5 miles)
Lowest 19 August, 2025
48.7 °FAverage August
67.1 °FHighest 21 August, 2025
91.7 °F
Climate (2020–Present)
Napa, Napa County Airport (7.5 miles)
Average Low 2020–2025
46.9 °FAverage 2020–2025
58.1 °FAverage High 2020–2025
70.5 °F