Jamestown, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Jamestown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain60%0.25″89°66°—
- SundayJul 5Overcast48%—84°69°-5°
- MondayJul 6Drizzle84%0.04″77°66°-7°
- TuesdayJul 7Thunderstorm68%—81°64°+4°
- WednesdayJul 8Light Showers19%0.01″74°64°-7°
- ThursdayJul 9Light Drizzle15%—83°61°+9°
- FridayJul 10Drizzle59%0.09″81°66°-2°
AQI 79 (Moderate), driven by Ozone. AQI up 24 in the last 6 hours — air quality is degrading. Ozone at AQI 96 — 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 96 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 96
- UV peak
- 1.9 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 96
PM × Wind × Precip
PM2.5 at 6.9 µg/m³, PM10 at 7.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.95
- Wind
- breezy
- Recent rain
- 1h 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
- 11:09 PM
- Moonset
- 10:18 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Jamestown at a glance
- Today vs. normal: 18°F above the seasonal normal for this latitude
- Last frost: April 18 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 16134
16-Day Forecast — Jamestown
- Sat89°66°60%
- Sun84°69°48%
- Mon77°66°84%
- Tue81°64°68%
- Wed74°64°19%
- Thu83°61°15%
- Fri81°66°59%
- Sat76°62°40%
- Sun75°59°23%
- Mon76°58°27%
- Tue76°54°23%
- Wed79°57°35%
- Thu81°57°43%
- Fri78°61°42%
- Sat82°65°45%
- Sun75°66°52%
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 — Jamestown
SPC has placed Jamestown in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWMRGLMarginal 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 Jamestown
- 15946