Brea, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Brea weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——87°65°—
- MondayJul 6Partly Cloudy——86°60°-1°
- TuesdayJul 7Clear——89°61°+3°
- WednesdayJul 8Clear——93°70°+4°
- ThursdayJul 9Clear——91°72°-2°
- FridayJul 10Overcast——90°71°-1°
- SaturdayJul 11Overcast——86°72°-4°
AQI 61 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 18.4 µg/m³, PM10 at 22.5 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 32 now. With UV 12 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 50 around 1 PM.
- Present
- AQI 32
- UV peak
- 11.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 50
PM × Wind × Precip
PM2.5 at 18.4 µg/m³, PM10 at 22.5 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.82
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:07 PM
- Moonset
- 11:10 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Brea at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: March 11 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 92821, 92823
16-Day Forecast — Brea
- Sun87°65°1%
- Mon86°60°1%
- Tue89°61°0%
- Wed93°70°0%
- Thu91°72°0%
- Fri90°71°0%
- Sat86°72°0%
- Sun87°70°2%
- Mon97°72°5%
- Tue97°77°10%
- Wed96°78°4%
- Thu101°80°10%
- Fri100°80°11%
- Sat95°78°3%
- Sun96°77°10%
- Mon99°77°11%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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.
ZIP codes in Brea
- 92821
- 92823
- 92822