Portola, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Portola weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Light Drizzle—0.01″82°57°—
- MondayJul 6Overcast——82°56°0°
- TuesdayJul 7Overcast——87°49°+5°
- WednesdayJul 8Clear——88°44°+1°
- ThursdayJul 9Clear——90°48°+2°
- FridayJul 10Overcast——92°50°+2°
- SaturdayJul 11Overcast——93°52°+1°
AQI 30 (Good), driven by Ozone. Ozone at AQI 65. Overcast through the UV peak window (cloud cover ~75%) — afternoon ozone should stay flat.
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 65. Overcast through the UV peak window (cloud cover ~75%) — afternoon ozone should stay flat.
- Present
- AQI 65
- UV peak
- 9.6 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 42
PM × Wind × Precip
PM2.5 at 6.8 µg/m³ (AQI 38), ratio 0.51 with 10 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.51
- Wind
- breezy
- 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
- 11:22 PM
- Moonset
- 11:19 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Portola at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 96122
16-Day Forecast — Portola
- Sun82°57°5%
- Mon82°56°1%
- Tue87°49°0%
- Wed88°44°0%
- Thu90°48°0%
- Fri92°50°0%
- Sat93°52°0%
- Sun91°59°1%
- Mon87°57°6%
- Tue93°52°10%
- Wed92°55°6%
- Thu93°56°4%
- Fri94°58°10%
- Sat94°56°9%
- Sun89°57°13%
- Mon90°51°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.
SPC Convective Outlook
Storm Prediction Center — Portola
SPC includes Portola in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Portola
- 96122