Newcastle, CA Weather Tomorrow

Use tomorrow's Newcastle weather forecast and the next 5 day outlook to track daily precipitation forecasts, changing sky conditions, daytime highs, overnight lows, Fahrenheit and Celsius temperatures, sunrise, sunset, wind chill, and local wind details for the Newcastle area and around Placer county, California.
Updated: Fri Sep 11th 2026 1:00 AM PDT
Newcastle, CA Weather – 9-11 – Sunny
87° / 68°
Sunny
In Newcastle, a sunny day is likely with a high near 87°F and a low around 68°F. Winds will be light at 10mph and gusts of 17mph at 11 PM. The air will be relatively dry with average humidity levels below 30%, the maximum being 36% at 7 AM and 11% being its lowest at 4 PM. Barometric pressure is its highest of 29.9inHg at 8 AM, a lowest point of 29.78inHg at 5 PM with an avg 29.85inHg.
Newcastle, CA Weather – 9-12 – Sunny
81° / 59°

Weather Tomorrow

Sunny
Newcastle may see a sunny day, with daytime highs of 81°F and overnight lows near 59°F. There's a very small chance of rainfall, only about 1%. Wind will be moderate, blowing around 13mph on average and gusts of 17.6mph at 7 PM. Humidity levels should be comfortable, sitting around 31% on average, the maximum being 57% at 11 PM and 17% being its lowest at 12 PM. Barometric pressure is its highest of 29.92inHg at 9 PM, a lowest point of 29.82inHg at 5 PM with an avg 29.86inHg.
Newcastle, CA Weather – 9-13 – Sunny
78° / 53°
Sunny
Daytime highs will reach 78°F with lows dropping to 53°F in Newcastle, where bright and sunny conditions. There's a very small chance of rainfall, only about 1%. Winds will be light at 10mph and gusts of 20.6mph at 12 PM. Humidity levels should be comfortable, sitting around 35% on average, the maximum being 66% at 6 AM and 10% being its lowest at 5 PM. Barometric pressure is its highest of 29.99inHg at 7 AM, a lowest point of 29.84inHg at 5 PM with an avg 29.92inHg.
Newcastle, CA Weather – 9-14 – Sunny
82° / 58°
Sunny
It will be sunny in Newcastle, with a high of 82°F and a low of 58°F. Winds will be light at 9mph and gusts of 19.7mph at 2 PM. The air will be relatively dry with average humidity levels below 30%, the maximum being 28% at 5 AM and 10% being its lowest at 1 PM. Barometric pressure is its highest of 29.88inHg at 12 AM, a lowest point of 29.76inHg at 5 PM with an avg 29.84inHg.
Newcastle, CA Weather – 9-15 – Sunny
84° / 60°
Sunny
Newcastle is set for sunshine with temperatures peaking at 84°F and dipping to 60°F. Winds will be light at 9mph and gusts of 18.3mph at 11 AM. The air will be relatively dry with average humidity levels below 30%, the maximum being 30% at 4 AM and 10% being its lowest at 5 PM. Barometric pressure is its highest of 29.9inHg at 11 PM, a lowest point of 29.8inHg at 5 PM with an avg 29.85inHg.
Newcastle, CA Weather – 9-16 – Sunny
84° / 63°
Sunny
Highs will reach 84°F with lows near 63°F in Newcastle, where sunshine is. There's a very small chance of rainfall, only about 1%. Winds will be light at 9mph and gusts of 19.2mph at 2 PM. The air will be relatively dry with average humidity levels below 30%, the maximum being 34% at 11 PM and 15% being its lowest at 5 PM. Barometric pressure is its highest of 30.02inHg at 11 PM, a lowest point of 29.9inHg at 2 AM with an avg 29.95inHg.

Currently

Clear 77°F
29.88 inHg.
Barometer
29%
Humidity
E 8.6 mph
Wind
Clear

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