Weather WorldUnion Lake, CA Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Union Lake Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY |
 |  |  |  | | | | | |  | |
| Mostly Sunny | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Sunny |
| Hi: 82°FHi: 28°C | Lo: 59°FLo: 15°C | Hi: 86°FHi: 30°C | Lo: 59°FLo: 15°C | Hi: 90°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C Lo: 59°FLo: 15°C | Hi: 88°FHi: 31°C Lo: 57°FLo: 14°C | Hi: 88°FHi: 31°C Lo: 57°FLo: 14°C | Hi: 86°FHi: 30°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 136 AM PDT Sun Aug 16 2026 
Union Lake Radar Loop
Use the map search tool if you want to place a location marker on the radar map...
Union Lake Weather Map
Union Lake Quick Facts
Union Lake Forecast Discussion
Issued: 1230 AM PDT Sun Aug 16 2026
Key Messages
- Smoke remains over areas outside of the marine layer due to local and distant wildfires.
- Temperatures close to normal remains through the first half of the coming week.
Discussion
...An upper level trough has set up over the eastern pacific while an upper level ridge dominates over the central US. This pattern is forecasted to continue through the weekend and into early next week. The decreased surface pressure has supported a deeper marine layer with stra...