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City of Gustine, CAGustine, CA Weather Forecast
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Gustine Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | MONDAY | TUESDAY |
 |  | | | | | | |  |  | | |
| Clear | Sunny | Mostly Clear | Sunny | Clear | Clear | Clear | Sunny | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear |
| Lo: 59°FLo: 15°C | Hi: 89°FHi: 32°C | Lo: 55°FLo: 13°C | Hi: 85°FHi: 29°C | Lo: 59°FLo: 15°C | Hi: 90°FHi: 32°C Lo: 60°FLo: 16°C | Hi: 90°FHi: 32°C Lo: 60°FLo: 16°C | Hi: 91°FHi: 33°C | Hi: 91°FHi: 33°C Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C Lo: 61°FLo: 16°C | Hi: 91°FHi: 33°C Lo: 60°FLo: 16°C | Hi: 91°FHi: 33°C Lo: 60°FLo: 16°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 701 PM PDT Tue Sep 15 2026 
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Issued: 948 PM PDT Tue Sep 15 2026
Key Messages
1. Minor Heat Risk over this week. Temperatures drop Wednesday through Friday before a warmup over the weekend.
2. Lake Wind Advisory in effect for San Luis Reservoir until midnight Thursday.
3. Dry conditions will remain for the next week.
Discussion
... Temperatures warmed up into the upper 80s to lower 90s on Tuesday. However, a trough slides in Wednesday and will slowly move out on Friday dropping temperatures. Latest probabilities have a 80 to 90 percent chance of highs below 90 deg...