Reliez Valley, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Reliez Valley, a community in Contra Costa County, California.
Today
100°F
Sunny
Sunny. High near 100, with temperatures falling to around 95 in the afternoon. West southwest wind 7 to 10 mph.
7-day forecast for Reliez Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 100°F | Sunny | 7 to 10 mph WSW | 0% |
| Tonight | 58°F | Clear | 12 mph WSW | 0% |
| Wednesday | 93°F | Sunny | 7 to 10 mph WSW | 0% |
| Wednesday Night | 58°F | Mostly Clear | 10 mph WSW | 0% |
| Thursday | 90°F | Sunny | 6 to 9 mph WSW | 0% |
| Thursday Night | 60°F | Mostly Clear | 10 mph WSW | 0% |
| Friday | 96°F | Sunny | 6 to 9 mph WSW | 0% |
| Friday Night | 61°F | Mostly Clear | 9 mph SW | 0% |
| Saturday | 95°F | Sunny | 5 to 9 mph WSW | 0% |
| Saturday Night | 63°F | Mostly Clear | 9 mph SW | 0% |
| Sunday | 90°F | Sunny | 8 to 12 mph SW | 0% |
| Sunday Night | 59°F | Mostly Clear | 13 mph SW | 0% |
| Monday | 83°F | Sunny | 13 mph SW | 0% |
| Monday Night | 58°F | Mostly Clear | 13 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Reliez Valley (37.940, -122.103). Updated through the day.
Growing snapshot for Reliez Valley
Last spring frost
Jan 7
First fall frost
Dec 19
Growing season
346 days
Hardiness zone
9b
More local growing data for Reliez Valley: nearby ZIP 94523 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Concord Wwtp, Ca (2 mi from Reliez Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.