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 4Rain30%0.22″90°66°—
- SundayJul 5Heavy Rain88%0.83″85°70°-5°
- MondayJul 6T-storm w/ Hail86%0.10″77°65°-8°
- TuesdayJul 7Foggy51%—75°61°-2°
- WednesdayJul 8Light Drizzle16%—82°57°+7°
- ThursdayJul 9Overcast45%—85°62°+3°
- FridayJul 10Light Drizzle43%—81°65°-4°
AQI 58 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 13.4 µg/m³ (AQI 59) with a 0.95 fine-to-coarse ratio and 5 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
Ozone × UV × Sky
Ozone at AQI 37 now. With UV 3.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 18 around 1 PM.
- Present
- AQI 37
- UV peak
- 3.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 18
PM × Wind × Precip
PM2.5 at 13.4 µg/m³ (AQI 59) with a 0.95 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.95
- Wind
- light
- 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
- 10:18 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Jamestown at a glance
- Today vs. normal: 73°F — typical for the season
- 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
- Sat90°66°30%
- Sun85°70°88%
- Mon77°65°86%
- Tue75°61°51%
- Wed82°57°16%
- Thu85°62°45%
- Fri81°65°43%
- Sat81°66°40%
- Sun77°63°27%
- Mon73°60°20%
- Tue70°59°16%
- Wed77°63°32%
- Thu90°67°32%
- Fri88°70°39%
- Sat80°68°40%
- Sun83°64°43%
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