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Trinity Lake MarinaTrinity Lake, CA Weather Forecast
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Trinity Lake Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | WEDNESDAY | THURSDAY |
 |  |  | | | | | | | | |
| Clearing | Sunny | Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Sunny |
| Lo: 48°FLo: 9°C | Hi: 81°FHi: 27°C | Lo: 52°FLo: 11°C | Hi: 84°FHi: 29°C | Lo: 55°FLo: 13°C | Hi: 86°FHi: 30°C | Hi: 88°FHi: 31°C Lo: 54°FLo: 12°C | Hi: 88°FHi: 31°C Lo: 54°FLo: 12°C | Hi: 88°FHi: 31°C Lo: 54°FLo: 12°C | Hi: 88°FHi: 31°C Lo: 54°FLo: 12°C | Hi: 79°FHi: 26°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 136 PM PDT Thu Sep 17 2026 
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Issued: 318 PM PDT Thu Sep 17 2026
Key Messages
- Slight chance (10%) of thunderstorms around the Trinity Alps Thursday evening.
- Warmer and drier interior temperatures into the weekend with highs in the 90s by Sunday.
- A shallow but strong marine layer forming close to shore with persistent marine clouds.
Discussion
...A deep cutoff trough has slowly continued to push over and east of the area today. This has kept conditions cooler across the area with interior highs again below 80. Some weak showers have forms over the eastern parts o...