Union Lake, CA Weather Forecast
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Union Lake Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY |
| Clearing | Sunny | Mostly Clear | Sunny | Clear | Clear | Clear | Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear |
| Lo: 60°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 91°FHi: 33°C | Hi: 91°FHi: 33°C Lo: 59°FLo: 15°C | Hi: 91°FHi: 33°C Lo: 59°FLo: 15°C | Hi: 90°FHi: 32°C Lo: 58°FLo: 14°C | Hi: 90°FHi: 32°C Lo: 58°FLo: 14°C | Hi: 83°FHi: 28°C | Hi: 83°FHi: 28°C Lo: 47°FLo: 8°C | Hi: 83°FHi: 28°C Lo: 47°FLo: 8°C | Hi: 83°FHi: 28°C Lo: 47°FLo: 8°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 314 PM PDT Sun Oct 04 2026 

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Issued: 343 PM PDT Sun Oct 4 2026
Key Messages
- Unseasonably hot temperatures with near record highs continue to generate Moderate HeatRisk across the interior through mid week.
- Shallow, diurnal marine layer persisting along the coast through the weekend.
- Dry conditions expected through this coming work week.
Discussion
...A consistent synoptic pattern remains overhead forcing relatively similar conditions for the past few days, expected to persist into the work week. Interior areas remain very hot, with close to record breaking tem...
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