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Lake Siskiyou Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY |
 |  |  |  | | | | | | | | |
| Partly Cloudy | Sunny | Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Clearing | Clear | Clear | Mostly Clear | Mostly Clear | Sunny |
| Lo: 56°FLo: 13°C | Hi: 86°FHi: 30°C | Lo: 56°FLo: 13°C | Hi: 86°FHi: 30°C | Lo: 56°FLo: 13°C | Hi: 80°FHi: 27°C | Lo: 50°FLo: 10°C | Hi: 80°FHi: 27°C Lo: 50°FLo: 10°C | Hi: 80°FHi: 27°C Lo: 50°FLo: 10°C | Hi: 80°FHi: 27°C Lo: 50°FLo: 10°C | Hi: 80°FHi: 27°C Lo: 50°FLo: 10°C | Hi: 76°FHi: 24°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 239 PM PDT Tue Aug 18 2026 
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Issued: 222 PM PDT Tue Aug 18 2026
Key Messages
- Dry weather is expected for inland areas through Thursday with above normal warmth and fairly typical afternoon breezes.
- Nightly marine pushes will bring cooler air and stratus to the coast, and also a chance of drizzle.
- Offshore low pressure brings heightened fire weather concerns Friday with gusty winds and at least a slight chance of thunderstorms.
- Breezy winds continue Saturday with a slight cool down.
- Dry, warmer weather returns Sunday/Monday.