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Coso Square Weather Forecast
| REST OF TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY |
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| Mostly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Mostly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Lo: 59°FLo: 15°C | Hi: 66°FHi: 19°C | Lo: 59°FLo: 15°C | Hi: 66°FHi: 19°C | Lo: 59°FLo: 15°C | Hi: 65°FHi: 18°C | Hi: 66°FHi: 19°C Lo: 59°FLo: 15°C | Hi: 66°FHi: 19°C Lo: 59°FLo: 15°C | Hi: 66°FHi: 19°C Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 302 AM PDT Fri Sep 18 2026 
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Issued: 430 AM PDT Fri Sep 18 2026
Key Messages
Updated at 1057 PM PDT Thu Sep 17 2026- Warming trend Friday into the weekend
- Brief cooldown Sunday
- Notable warming trend next week
Aviation
... (12Z TAFS) Issued at 429 AM PDT Fri Sep 18 2026
MVFR-IFR ceilings are coming into the region and forming along topographically favored hillsides, with further expansion expected through the next few hours. The cloud deck should retreat back to the coast through the post-sunrise hours, with gentle to moderate onshore winds expected in the afterno...