Upper Peninsula Lake, CA Weather Forecast
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Upper Peninsula Lake Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY |
| Sunny | Clear | Sunny | Clear | Sunny | Clear | Clear | Clear | Sunny | Mostly Clear | Mostly Clear |
| Hi: 68°FHi: 20°C | Lo: 44°FLo: 7°C | Hi: 66°FHi: 19°C | Lo: 42°FLo: 6°C | Hi: 63°FHi: 17°C | Hi: 63°FHi: 17°C Lo: 41°FLo: 5°C | Hi: 63°FHi: 17°C Lo: 41°FLo: 5°C | Hi: 63°FHi: 17°C Lo: 41°FLo: 5°C | Hi: 68°FHi: 20°C | Hi: 68°FHi: 20°C Lo: 45°FLo: 7°C | Hi: 68°FHi: 20°C Lo: 45°FLo: 7°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 310 AM PDT Mon Sep 14 2026 

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Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 1030 AM PDT Mon Sep 14 2026
Discussion
... A flattened trough and jet stream set up a slight warmup, with a prominent ridge over the South. The warm up will continue through Tuesday when there is a 70 to 80 percent chance of highs of at least 90 degrees on Tuesday. Having those windows open is pretty nice, huh? Enjoy it!
Ensemble models show another trough sliding in Wednesday into Thursday, producing cooler temperatures. Not that it is a burden at all. Wednesday and Friday have a 30 to 45 percent chance of highs of at least...
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