Los Altos, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Los Altos weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Foggy——77°57°—
- MondayJul 6Overcast——78°55°+1°
- TuesdayJul 7Overcast——85°50°+7°
- WednesdayJul 8Mostly Clear——90°51°+5°
- ThursdayJul 9Clear——91°54°+1°
- FridayJul 10Overcast——96°53°+5°
- SaturdayJul 11Overcast——102°62°+6°
AQI 32 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 8.2 µg/m³ (AQI 46), ratio 0.67 with 8 mph wind — characteristic of long-range haze transport rather than a local source.
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 35 now. With UV 10 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 48 around 1 PM.
- Present
- AQI 35
- UV peak
- 10.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 48
PM × Wind × Precip
PM2.5 at 8.2 µg/m³ (AQI 46), ratio 0.67 with 8 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.67
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
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
- 11:27 PM
- Moonset
- 11:27 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Los Altos at a glance
- Today vs. normal: 76°F — typical for the season
- Last frost: March 31 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 94022, 94024
16-Day Forecast — Los Altos
- Sun77°57°0%
- Mon78°54°0%
- Tue85°50°1%
- Wed90°51°1%
- Thu91°54°0%
- Fri96°53°0%
- Sat102°62°1%
- Sun87°66°1%
- Mon95°64°2%
- Tue99°61°4%
- Wed97°59°1%
- Thu100°60°3%
- Fri105°67°3%
- Sat100°64°0%
- Sun95°58°0%
- Mon95°56°0%
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 Los Altos
- 94022
- 94024
- 94023