Castro Valley Weather Forecast
- 57
- 82
Mostly Sunny
- 53
- 79
Mostly Sunny
- 55
- 81
Sunny
- 54
- 82
Mostly Sunny
- 56
- 82
Mostly Sunny
- 57
- 85
Mostly Sunny
Today 18 May San Francisco Bay Shoreline
Sunny. Highs in the 70s to mid 80s. West Winds 5 to 10 Mph increasing to 10 to 20 Mph in the afternoon.
Tonight 18 May San Francisco Bay Shoreline
Mostly clear. Lows in the mid 50s. West Winds 10 to 20 Mph.
Castro Valley Temperature Statistics
May Temperature
Hayward, Hayward Air Terminal (3.1 miles)
Lowest 11 May, 2022
42.1 °FAverage May
56.8 °FHighest 4 May, 2022
78.1 °F
Climate (2010–Present)
Hayward, Hayward Air Terminal (3.1 miles)
Average Low 2010–Present
51.6 °FAverage 2010–Present
58.6 °FAverage High 2010–Present
68.1 °F