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Castle Lake Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY |
 |  | | | |  | | |  | | | |
| Sunny | Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Snow and Rain | Snow and Rain | Snow and Rain | Snow Showers | Snow and Rain | Mostly Clear | Mostly Clear |
| Hi: 59°FHi: 15°C | Lo: 37°FLo: 3°C | Hi: 53°FHi: 12°C | Lo: 35°FLo: 2°C | Hi: 50°FHi: 10°C | Lo: 35°FLo: 2°C | Hi: 44°FHi: 7°C | Lo: 31°FLo: -1°C | Hi: 38°FHi: 3°C | Lo: 28°FLo: -2°C | Hi: 45°FHi: 7°C Lo: 29°FLo: -2°C | Hi: 45°FHi: 7°C Lo: 29°FLo: -2°C |
| POP: 50% | POP: 70% | POP: 90% | POP: 90% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1141 PM PDT Sun Oct 18 2026 
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Issued: 955 PM PDT Sun Oct 18 2026
Key Messages
1. Seasonally average conditions Monday
2. High confidence in a pattern change starting Tuesday.
3. Temperatures well below average next week with moderate confidence of rain and high Sierra snow early Wednesday morning through Thursday.
Discussion
... Sunday, October 18 is still on track to be the last day of 90 degree temperature in 2026. In anticipation of a major pattern change later this week, high temperatures Monday are expected in the low-to-mid 80s across the San Joaquin Valley ...