Barstow, CA Weather Forecast
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Barstow Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | TUESDAY | WEDNESDAY |
| Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 106°FHi: 41°C | Lo: 78°FLo: 26°C | Hi: 104°FHi: 40°C | Lo: 77°FLo: 25°C | Hi: 104°FHi: 40°C | Hi: 104°FHi: 40°C Lo: 76°FLo: 24°C | Hi: 104°FHi: 40°C Lo: 76°FLo: 24°C | Hi: 104°FHi: 40°C Lo: 76°FLo: 24°C | Hi: 104°FHi: 40°C Lo: 76°FLo: 24°C | Hi: 104°FHi: 40°C Lo: 76°FLo: 24°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 500 AM PDT Thu Aug 20 2026 

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Barstow 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...
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