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O'Brien Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  | | | | | |  |  | | |
| Sunny | Mostly Clear | Partly Cloudy | Clear | Sunny | Clear | Mostly Sunny | Mostly Clear | Chance of Rain | Chance of Rain | Chance of Rain | Chance of Rain |
| Hi: 73°FHi: 23°C | Lo: 51°FLo: 11°C | Hi: 72°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 79°FHi: 26°C | Lo: 54°FLo: 12°C | Hi: 82°FHi: 28°C | Lo: 56°FLo: 13°C | Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 86°FHi: 30°C | Hi: 83°FHi: 28°C Lo: 59°FLo: 15°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 800 AM PDT Sat Sep 05 2026 
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Issued: 144 PM PDT Fri Sep 4 2026
Key Messages
- Lingering showers today over the Sierra and southern Cascades and adjacent foothills
- Mainly dry this weekend, with some mountain showers Sunday over Shasta County.
- Gradual warming trend this weekend and into early next week, but highs likely remain below average for this time of the year
- There is the potential for monsoonal moisture mid-next week, but confidence in details remains low at this point
Discussion
...Lingering shower activity continues to taper off to the east this afternoo...