Simi Valley, California Weather
August begins in scorching stillness. Day 43 of summer. Read this microseason across nine climate regions →
Simi Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayAug 2Clear——91°65°—
- MondayAug 3Clear——91°63°0°
- TuesdayAug 4Mostly Clear——100°64°+9°
- WednesdayAug 5Clear——100°68°0°
- ThursdayAug 6Clear——100°68°0°
- FridayAug 7Clear——100°70°0°
- SaturdayAug 8Clear——100°70°0°
AQI 59 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 20.5 µg/m³ (AQI 72) with a 0.63 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 20.5 µg/m³ (AQI 72) with a 0.63 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.63
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
Red sky at night, sailor's delight.
- Moonrise
- 9:40 PM
- Moonset
- 10:04 AM
- In sign
- ♓︎ Pisces
August begins in scorching stillness
Simi Valley at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: March 13 (climatological average for this latitude)
- Microseason: Aug 1–5
- Planting window: Sow fall peas. Start kale and collard seedlings for fall.
ZIP codes: 93063, 93065
16-Day Forecast — Simi Valley
- Sun91°65°0%
- Mon91°63°0%
- Tue100°64°0%
- Wed100°68°0%
- Thu100°68°0%
- Fri100°70°0%
- Sat100°70°0%
- Sun98°69°1%
- Mon93°67°1%
- Tue95°65°0%
- Wed95°65°1%
- Thu97°65°3%
- Fri98°67°7%
- Sat96°66°6%
- Sun98°66°10%
- Mon98°65°9%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Simi Valley
Right now in the garden
Peak growing season
As of August 2, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Sun & seasons in Simi Valley
Simi Valley sits in Ventura County, where the year’s longest day runs 14h 27m of daylight and its shortest just 9h 52m — a swing of +4h 35m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Los Angeles, the state’s largest city, lies about 22 miles to the ESE. The nearest town Simi Valley tracks is Thousand Oaks, roughly 9 miles to the SW.
Air quality in Simi Valley’s county has trended cleaner since 2020; its cleanest year on record was 2023 (median AQI 46). See the full air-quality history for Simi Valley.
ZIP codes in Simi Valley
- 93063
- 93065
- 93062
- 93094
- 93099