Mertztown, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Mertztown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain32%0.15″96°73°—
- SundayJul 5Showers59%0.63″91°71°-5°
- MondayJul 6T-storm w/ Hail95%0.57″79°70°-12°
- TuesdayJul 7Light Showers84%0.02″75°63°-4°
- WednesdayJul 8Light Drizzle24%0.01″76°61°+1°
- ThursdayJul 9Light Drizzle14%—86°63°+10°
- FridayJul 10Drizzle47%0.04″81°67°-5°
AQI 98 (Moderate), driven by Ozone. AQI up 40 in the last 6 hours — air quality is degrading. Ozone at AQI 70 — 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 70 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 70
- UV peak
- 0.8 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 70
PM × Wind × Precip
PM2.5 at 8.0 µg/m³, PM10 at 8.5 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- Wind
- light
- 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
- 10:56 PM
- Moonset
- 10:05 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Mertztown at a glance
- Today vs. normal: 25°F above the seasonal normal for this latitude
- Last frost: April 19 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 19539
16-Day Forecast — Mertztown
- Sat96°73°32%
- Sun91°71°59%
- Mon79°70°95%
- Tue75°63°84%
- Wed76°61°24%
- Thu86°63°14%
- Fri81°67°47%
- Sat84°66°26%
- Sun79°63°28%
- Mon76°64°19%
- Tue84°62°17%
- Wed85°59°34%
- Thu87°62°45%
- Fri89°65°39%
- Sat87°66°39%
- Sun84°70°49%
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 — Mertztown
SPC has placed Mertztown 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 Mertztown
- 19539