Fullerton, California Weather
August begins in scorching stillness. Day 43 of summer. Read this microseason across nine climate regions →
Fullerton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayAug 2Foggy——92°69°—
- MondayAug 3Foggy——89°66°-3°
- TuesdayAug 4Mostly Clear——94°66°+5°
- WednesdayAug 5Clear——92°74°-2°
- ThursdayAug 6Clear——90°73°-2°
- FridayAug 7Clear——91°74°+1°
- SaturdayAug 8Clear——92°74°+1°
AQI 69 (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 0.87 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 0.87 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.87
- 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
- 9:36 PM
- Moonset
- 10:01 AM
- In sign
- ♓︎ Pisces
August begins in scorching stillness
Fullerton at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: March 10 (climatological average for this latitude)
- Microseason: Aug 1–5
- Planting window: Sow fall peas. Start kale and collard seedlings for fall.
ZIP codes: 92831, 92832, 92833, 92835
16-Day Forecast — Fullerton
- Sun92°69°0%
- Mon89°66°0%
- Tue94°66°0%
- Wed92°74°0%
- Thu90°73°0%
- Fri91°74°0%
- Sat92°74°0%
- Sun92°74°1%
- Mon89°74°2%
- Tue88°73°0%
- Wed88°73°0%
- Thu91°72°6%
- Fri92°73°10%
- Sat90°74°5%
- Sun93°73°6%
- Mon91°73°3%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Fullerton
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 Fullerton
Fullerton sits in Orange County, where the year’s longest day runs 14h 25m of daylight and its shortest just 9h 54m — a swing of +4h 31m 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 32 miles to the WNW. The nearest town Fullerton tracks is Anaheim, roughly 5 miles to the SE.
Air quality in Fullerton’s county has held roughly steady since 2020; its cleanest year on record was 2023 (median AQI 52). See the full air-quality history for Fullerton.
ZIP codes in Fullerton
- 92835
- 92833
- 92832
- 92831
- 92834
- 92836
- 92837
- 92838