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Upper Letts Lake Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Sunny | Clear | Sunny | Clear | Sunny | Clear | Sunny | Clear | Clear | Clear | Clear | Sunny |
| Hi: 83°FHi: 28°C | Lo: 69°FLo: 21°C | Hi: 83°FHi: 28°C | Lo: 68°FLo: 20°C | Hi: 83°FHi: 28°C | Lo: 67°FLo: 19°C | Hi: 82°FHi: 28°C | Hi: 83°FHi: 28°C Lo: 64°FLo: 18°C | Hi: 83°FHi: 28°C Lo: 64°FLo: 18°C | Hi: 72°FHi: 22°C Lo: 57°FLo: 14°C | Hi: 72°FHi: 22°C Lo: 57°FLo: 14°C | Hi: 63°FHi: 17°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 342 AM PDT Mon Oct 05 2026 
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Issued: 406 AM PDT Mon Oct 5 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.
- Confidence is increasing for a cooling trend late next weekend, with potential for unsettled weather.
Aviation
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VFR conditions through the TAF period, with light winds. Clouds will increase through the afternoon with a BKN to OVC cloud deck th...