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Antelope Valley Reservoir, CA Weather Forecast
Antelope Valley Reservoir, CA Weather Forecast Date: 231 PM PDT Thu Aug 13 2026
The area/counties/county of: Lassen, including the cities of: Portola, Susanville, Westwood, Sierraville, and Loyalton.or toggle through each period.
Tonight... Partly cloudy with a slight chance of showers and thunderstorms in the evening, then clear after midnight. Lows 40 to 50. Southwest winds 10 to 15 mph in the evening becoming light.
Friday... Sunny. Highs 76 to 86. Light winds becoming southwest 10 to 15 mph in the afternoon.
Friday Night... Clear. Lows 40 to 50. West winds around 10 mph in the evening becoming light.
Saturday... Sunny. Highs 79 to 89. Light winds becoming southwest around 10 mph in the afternoon.
Saturday Night... Clear. Lows 40 to 50. West winds around 10 mph in the evening becoming light.
Sunday... Partly cloudy. Highs 80 to 90.
Sunday Night... Partly cloudy in the evening then becoming mostly cloudy. Lows 43 to 53.
Monday... Mostly cloudy in the morning then becoming partly cloudy. Highs 81 to 91.
Monday Night... Partly cloudy. Lows 41 to 51. Highs 78 to 88.
Tuesday... Partly cloudy. Lows 41 to 51. Highs 78 to 88.
Wednesday... Partly cloudy. Lows 41 to 51. Highs 78 to 88.
POP = Probability of Precipitation
Antelope Valley Reservoir Radar Loop
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