Steamboat Slough Weather Forecast
- 50
- 76
Increasing Clouds
- 50
- 77
Becoming Sunny
- 52
- 75
Partly Sunny
- 52
- 75
Partly Sunny
- 54
- 81
Mostly Sunny
- 55
- 89
Mostly Sunny
- 53
- 83
Mostly Sunny
Today 5 Jul North Bay Interior Valleys
Sunny. Highs in the upper 60s to lower 80s. Southwest Winds 5 to 15 Mph.
Tonight 5 Jul North Bay Interior Valleys
Mostly clear. Lows in the upper 40s to mid 50s. West Winds 10 to 20 Mph. Becoming southwest 5 to 10 Mph after midnight.
Steamboat Slough Temperature Statistics
July Temperature
Napa, Napa County Airport (7.5 miles)
Lowest 3 July, 2025
51.1 °FAverage July
61.1 °FHighest 1 July, 2025
72 °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
70.6 °F