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Lassen Trail Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  |  | | | | | | | | |
| Clear | Partly Cloudy | Mostly Cloudy | Mostly Sunny | Clear | Sunny | Clear | Clear | Clear | Mostly Clear | Mostly Clear | Mostly Sunny |
| Lo: 59°FLo: 15°C | Hi: 83°FHi: 28°C | Lo: 59°FLo: 15°C | Hi: 83°FHi: 28°C | Lo: 58°FLo: 14°C | Hi: 85°FHi: 29°C | Lo: 58°FLo: 14°C | Hi: 85°FHi: 29°C Lo: 58°FLo: 14°C | Hi: 85°FHi: 29°C Lo: 58°FLo: 14°C | Hi: 77°FHi: 25°C Lo: 54°FLo: 12°C | Hi: 77°FHi: 25°C Lo: 54°FLo: 12°C | Hi: 67°FHi: 19°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 217 PM PDT Sat Oct 03 2026 
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Issued: 128 PM PDT Sat Oct 3 2026
Key Messages
- Heat Advisory in effect till 10 PM Wednesday for the Sacramento Valley, Delta, northern San Joaquin Valley, and adjacent foothills.
- Widespread Moderate HeatRisk with areas of Major HeatRisk through Thursday for the Delta, Valley, and Foothills.
Discussion
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...Today through Thursday...
High pressure continues to dominate the weather pattern aloft across the western United States. This has brought light winds, dry conditions, and hot temperatures to Interior California. Temperatures wil...