Weather WorldOld Lassen Trail, CA Weather Forecast
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Old Lassen Trail Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  |  |  | | | | | | |
| Mostly Cloudy | Mostly Cloudy | Clearing | Clearing | Sunny | Clear | Sunny | Clear | Clear | Clear | Mostly Clear | Mostly Clear |
| Hi: 76°FHi: 24°C | Lo: 58°FLo: 14°C | Hi: 74°FHi: 23°C | Lo: 53°FLo: 12°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 88°FHi: 31°C | Hi: 87°FHi: 31°C Lo: 64°FLo: 18°C | Hi: 87°FHi: 31°C Lo: 64°FLo: 18°C | Hi: 87°FHi: 31°C Lo: 64°FLo: 18°C | Hi: 86°FHi: 30°C Lo: 62°FLo: 17°C | Hi: 86°FHi: 30°C Lo: 62°FLo: 17°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1132 AM PDT Sat Sep 26 2026 
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Issued: 147 PM PDT Fri Sep 25 2026
Key Messages
- Periods of breezy to gusty winds through early next week.
- Periods of Elevated Fire Weather Conditions for portions of interior NorCal into early next week due to breezy winds and low humidities.
- Areas of Moderate HeatRisk in the Northern San Joaquin Valley into this evening.
- Slight chances (15-30%) for showers in the Sierra south of Hwy 50 on Monday, along with low chances (around 10%) for isolated thunderstorms. Otherwise, primarily dry weather continues into next week.
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