Westmont, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Westmont weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——78°62°—
- MondayJul 6Partly Cloudy——78°61°0°
- TuesdayJul 7Mostly Clear——77°61°-1°
- WednesdayJul 8Clear——77°69°0°
- ThursdayJul 9Clear——81°70°+4°
- FridayJul 10Clear——80°69°-1°
- SaturdayJul 11Overcast——80°69°0°
AQI 51 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±4 points). PM2.5 at 13.4 µg/m³ (AQI 59) with a 0.78 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm 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 13.4 µg/m³ (AQI 59) with a 0.78 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.78
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:09 PM
- Moonset
- 11:12 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Westmont at a glance
- Today vs. normal: 76°F — typical for the season
- Last frost: March 11 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Westmont
- Sun78°62°0%
- Mon78°61°0%
- Tue77°61°0%
- Wed77°69°0%
- Thu81°70°0%
- Fri80°69°0%
- Sat80°69°0%
- Sun77°70°2%
- Mon77°69°7%
- Tue79°69°7%
- Wed81°72°2%
- Thu82°72°10%
- Fri87°75°10%
- Sat91°78°7%
- Sun85°76°13%
- Mon83°72°13%
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 Westmont
- 90044
- 90047