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Big River, CA Weather Forecast
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Big River Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | WEDNESDAY |
 |  | | | | | | | | | |
| Mostly Sunny | Partly Cloudy | Sunny | Partly Cloudy | Sunny | Partly Cloudy | Sunny | Partly Cloudy | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 110°FHi: 43°C | Lo: 88°FLo: 31°C | Hi: 110°FHi: 43°C | Lo: 87°FLo: 31°C | Hi: 111°FHi: 44°C | Lo: 88°FLo: 31°C | Hi: 110°FHi: 43°C | Lo: 87°FLo: 31°C | Hi: 110°FHi: 43°C Lo: 87°FLo: 31°C | Hi: 110°FHi: 43°C Lo: 87°FLo: 31°C | Hi: 110°FHi: 43°C Lo: 87°FLo: 31°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 500 AM PDT Thu Aug 20 2026 
Big River Radar Loop
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Big River Forecast Discussion
Issued: 410 AM PDT THU Aug 20 2026
Key Messages
- Warm temperatures continue with above- normal afternoon highs and near-record warmth for the morning lows.
- Thunderstorm chances return to the forecast starting Thursday as monsoon moisture increases, with the highest confidence and most widespread storm coverage on Friday.
Discussion
...Through Tuesday
Overnight lows look to be very similar to the previous night with only a few degrees warmer for a few sites, continuing the pattern of near record-breaking w...