Weather WorldCypress Lake, CA 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Cypress Lake, CA Weather Forecast
Cypress Lake, CA Weather Forecast Date: 231 PM PDT Sun Aug 16 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. Lows 45 to 55. West winds around 10 mph in the evening becoming light.
Monday... Mostly cloudy in the morning then becoming partly cloudy. Highs 83 to 93. Light winds becoming southwest 10 to 15 mph in the afternoon.
Monday Night... Partly cloudy. Lows 44 to 54. West winds 10 to 15 mph in the evening becoming light.
Tuesday... Partly cloudy in the morning then becoming sunny. Highs 84 to 94. Light winds.
Tuesday Night... Partly cloudy in the evening then becoming clear. Lows 46 to 56. West winds around 10 mph in the evening becoming light.
Wednesday... Partly cloudy in the morning then becoming sunny. Highs 86 to 96.
Wednesday Night... Clear. Lows 46 to 56.
Thursday... Partly cloudy in the morning then becoming sunny. Highs 85 to 95.
Thursday Night... Partly cloudy. Lows 46 to 56.
Friday... Clear. Highs 81 to 91. Lows 41 to 51.
Saturday... Clear. Highs 81 to 91. Lows 41 to 51.
POP = Probability of Precipitation
Cypress Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...