Newcastle, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Newcastle, a community in Placer County, California.
Today
102°F
Sunny
Sunny, with a high near 102. South southwest wind around 6 mph.
7-day forecast for Newcastle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 102°F | Sunny | 6 mph SSW | 0% |
| Tonight | 68°F | Clear | 5 mph SSE | 0% |
| Wednesday | 100°F | Sunny | 6 mph SSW | 0% |
| Wednesday Night | 67°F | Clear | 5 mph S | 0% |
| Thursday | 100°F | Sunny | 5 mph SSW | 0% |
| Thursday Night | 68°F | Clear | 5 mph S | 0% |
| Friday | 101°F | Sunny | 5 mph S | 0% |
| Friday Night | 70°F | Clear | 5 mph SSE | 0% |
| Saturday | 102°F | Sunny | 5 mph SSE | 0% |
| Saturday Night | 70°F | Mostly Clear | 6 mph S | 0% |
| Sunday | 100°F | Sunny | 3 to 7 mph SSE | 0% |
| Sunday Night | 66°F | Mostly Clear | 3 to 7 mph SSE | 0% |
| Monday | 94°F | Sunny | 3 to 7 mph S | 0% |
| Monday Night | 62°F | Mostly Clear | 3 to 7 mph S | 0% |
Forecast source: National Weather Service (api.weather.gov) for Newcastle (38.867, -121.132). Updated through the day.
Growing snapshot for Newcastle
Last spring frost
Feb 25
First fall frost
Dec 5
Growing season
286 days
Hardiness zone
9b
More local growing data for Newcastle: nearby ZIP 95658 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Auburn, Ca (4.9 mi from Newcastle). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.