Mercer, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Mercer weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle60%0.03″91°66°—
- SundayJul 5Drizzle73%0.03″83°67°-8°
- MondayJul 6Thunderstorm68%0.06″76°64°-7°
- TuesdayJul 7Light Drizzle25%—82°60°+6°
- WednesdayJul 8Overcast——82°60°0°
- ThursdayJul 9Heavy Drizzle50%—83°63°+1°
- FridayJul 10Drizzle44%—79°65°-4°
AQI 46 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 11.9 µg/m³ (AQI 56) with a 0.98 fine-to-coarse ratio and 4 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 during the projected peak around 7 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 30 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 around 1 PM.
- Present
- AQI 30
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5 at 11.9 µg/m³ (AQI 56) with a 0.98 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.98
- Wind
- calm
- 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
- 11:16 PM
- Moonset
- 10:23 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Mercer at a glance
- Today vs. normal: 72°F — typical for the season
- Last frost: April 23 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 16137
16-Day Forecast — Mercer
- Sat91°66°60%
- Sun83°67°73%
- Mon76°64°68%
- Tue82°60°25%
- Wed82°60°9%
- Thu83°63°50%
- Fri79°65°44%
- Sat83°63°35%
- Sun75°61°26%
- Mon70°57°19%
- Tue75°57°20%
- Wed84°65°40%
- Thu88°66°39%
- Fri84°67°49%
- Sat82°67°35%
- Sun81°62°39%
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 — Mercer
SPC has placed Mercer in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
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 Mercer
- 16137