Newcastle, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Newcastle, a community in Placer County, California.
This Afternoon
84°F
Sunny
Sunny, with a high near 84. West northwest wind around 5 mph.
7-day forecast for Newcastle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Sunny | 5 mph WNW | 0% |
| Tonight | 56°F | Clear | 3 mph ENE | 0% |
| Saturday | 88°F | Sunny | 5 mph SSW | 0% |
| Saturday Night | 61°F | Partly Cloudy | 3 mph SE | 0% |
| Sunday | 85°F | Partly Sunny | 5 mph SE | 0% |
| Sunday Night | 58°F | Mostly Cloudy | 3 mph SSE | 0% |
| Monday | 86°F | Sunny | 1 to 6 mph SSW | 0% |
| Monday Night | 59°F | Mostly Clear | 5 mph SSE | 0% |
| Tuesday | 88°F | Sunny | 5 mph SSW | 0% |
| Tuesday Night | 62°F | Clear | 3 mph SE | 0% |
| Wednesday | 93°F | Sunny | 1 to 5 mph WSW | 0% |
| Wednesday Night | 65°F | Mostly Clear | 3 mph SE | 0% |
| Thursday | 96°F | Sunny | 5 mph SSW | 0% |
| Thursday Night | 66°F | Mostly Clear | 5 mph SSE | 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 Sep 19, 2026.