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Newcastle, CA Weather Forecast

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Newcastle, CA Weather Forecast

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Newcastle CA weather - Clear - 89°F
Clear
89°F
Updated 4:54 pm
Feels Like 87°F
Humidity 18%
Wind SW 9 mph
Barometer  29.88 in
Dew Point 41°F
Newcastle CA weather - Clear - 32°C
Clear
32°C
Updated 4:54 pm
Feels Like 31°C
Humidity 18%
Wind SW 14 km/h
Barometer  101.1 kPa
Dew Point 5°C
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Newcastle Weather Forecast

TONIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY
Newcastle, CA Weather - Tonight Clear Newcastle, CA Weather - Saturday Sunny Newcastle, CA Weather - Saturday Night Clear Newcastle, CA Weather - Sunday Sunny Newcastle, CA Weather - Sunday Night Clear Newcastle, CA Weather - Monday Sunny Newcastle, CA Weather - Monday Night Clear Newcastle, CA Weather - Tuesday Sunny Newcastle, CA Weather - Tuesday Night Mostly Clear Newcastle, CA Weather - Wednesday Mostly Clear Newcastle, CA Weather - Wednesday Night Clear Newcastle, CA Weather - Thursday Clear
Clear Sunny Clear Sunny Clear Sunny Clear Sunny Mostly Clear Mostly Clear Clear Clear
Lo: 61°FLo: 16°C Hi: 87°FHi: 31°C
 Lo: 55°FLo: 13°C Hi: 83°FHi: 28°C
 Lo: 56°FLo: 13°C Hi: 88°FHi: 31°C
 Lo: 58°FLo: 14°C Hi: 88°FHi: 31°C
 Hi: 88°FHi: 31°C
Lo: 58°FLo: 14°C		 Hi: 88°FHi: 31°C
Lo: 58°FLo: 14°C		 Hi: 88°FHi: 31°C
Lo: 58°FLo: 14°C		 Hi: 88°FHi: 31°C
Lo: 58°FLo: 14°C
POP = Probability of Precipitation.
Weather Outlook Updated: 201 PM PDT Fri Sep 11 2026 Newcastle, CA Weather - WeatherWorld.com

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Issued: 1158 AM PDT Fri Sep 11 2026

Key Messages

  • Renewed fire weather conditions over the weekend and into early next week due to gusty winds and low daytime humidity
  • Red Flag Warning in place for portions of northern California from 11 AM PDT Saturday through 11 AM PDT Monday
  • Notable cool down over the weekend, with near to below normal temperatures expected

Discussion

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Today-Monday: Mostly clear skies observable today, though as onshore flow increases and the ridging of the past few days breaks down, temperatures are expected to ...