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Simi Valley Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
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| Sunny | Chance of Showers | Chance of T-Storm | Mostly Clear | Sunny | Partly Cloudy | Chance of Showers | Partly Cloudy | Chance of Showers | Partly Cloudy | Partly Cloudy | Mostly Clear |
| Hi: 86°FHi: 30°C | Lo: 61°FLo: 16°C | Hi: 77°FHi: 25°C | Lo: 60°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 60°FLo: 16°C | Hi: 86°FHi: 30°C | Lo: 63°FLo: 17°C | Hi: 86°FHi: 30°C | Lo: 65°FLo: 18°C | Hi: 86°FHi: 30°C | Lo: 63°FLo: 17°C |
| POP: 30% | POP: 50% | POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 129 AM PDT Sat Sep 05 2026 
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Instant definitions for any meteorological term.
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Issued: 104 AM PDT Sat Sep 5 2026
Aviation
...05/0803Z.
At 07Z at KLAX, the marine layer was 1900 feet deep. The top of a weak inversion was 2700 feet with a temperature of 21 deg Celsius.
High confidence in desert TAFs, KPRB, and KSBA.
Low to moderate confidence remainder of TAFs where there is a low cigs/vsbys may be patchy or not form at all where forecast and vice versa. Low MVFR cigs/vsbys are favored where low cigs do form except IFR or lower for KSMX and possibly KSBP.
KLAX...Low confidence in TAF. There is a 40-50% chance tha...