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Big Jack Lake, CA Weather Forecast
Big Jack Lake, CA Weather Forecast Date: 231 PM PDT Mon Sep 28 2026
The area/counties/county of: Lassen, including the cities of: Portola, Susanville, Westwood, Sierraville, and Loyalton.or toggle through each period.
Tonight... Clear. Lows 33 to 43. North winds around 10 mph in the evening becoming light.
Tuesday... Sunny. Highs 70 to 80. Light winds becoming northeast around 10 mph in the afternoon.
Tuesday Night... Clear. Lows 37 to 47. Northeast winds around 10 mph in the evening becoming light.
Wednesday... Sunny. Highs 76 to 86. Light winds becoming east around 10 mph in the afternoon.
Wednesday Night... Clear. Lows 40 to 50. Light winds.
Thursday... Sunny. Highs 79 to 89.
Thursday Night... Clear. Lows 41 to 51.
Friday... Partly cloudy in the morning then becoming sunny. Highs 78 to 88.
Friday Night... Partly cloudy. Lows 40 to 50.
Saturday... Clear. Highs 78 to 88. Lows 42 to 52.
Sunday... Clear. Highs 78 to 88. Lows 42 to 52.
POP = Probability of Precipitation
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