Palo Alto, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Palo Alto weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast25%—95°74°—
- SundayJul 5Rain55%0.26″89°72°-6°
- MondayJul 6Thunderstorm92%1.2″76°69°-13°
- TuesdayJul 7Light Showers79%0.02″77°62°+1°
- WednesdayJul 8Light Drizzle19%—72°60°-5°
- ThursdayJul 9Light Drizzle14%—88°63°+16°
- FridayJul 10Light Drizzle56%—81°66°-7°
AQI 77 (Moderate), driven by Ozone. AQI up 20 in the last 6 hours — air quality is degrading. Ozone at AQI 73 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
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 73 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 73
- UV peak
- 2.2 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 73
PM × Wind × Precip
PM2.5 at 7.8 µg/m³, PM10 at 8.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- 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
- 10:59 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Palo Alto at a glance
- Today vs. normal: 24°F above the seasonal normal for this latitude
- Last frost: April 20 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Palo Alto
- Sat95°72°25%
- Sun89°73°55%
- Mon76°69°92%
- Tue77°62°79%
- Wed72°60°19%
- Thu88°63°14%
- Fri81°66°56%
- Sat82°66°25%
- Sun78°63°27%
- Mon82°62°20%
- Tue83°60°19%
- Wed86°58°37%
- Thu86°61°53%
- Fri88°63°37%
- Sat87°66°35%
- Sun82°68°46%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, 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 — Palo Alto
SPC has placed Palo Alto in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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 Palo Alto
- 17901