Mercersville, Maryland Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Mercersville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Rain28%0.10″102°76°—
- SundayJul 5Light Rain41%0.07″95°73°-7°
- MondayJul 6Heavy Drizzle79%0.06″86°73°-9°
- TuesdayJul 7Showers79%—79°68°-7°
- WednesdayJul 8Drizzle24%0.04″73°67°-6°
- ThursdayJul 9Light Drizzle12%—95°67°+22°
- FridayJul 10Light Drizzle37%0.02″90°71°-5°
AQI 86 (Moderate), driven by PM2.5. AQI up 11 over the last 6 hours (gradual rise). PM scrubbed by 3 hours of recent rain — PM2.5 down to 9.0 µg/m³, PM10 to 9.5 µg/m³.
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 50 now. With UV 0.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 around 1 PM.
- Present
- AQI 50
- UV peak
- 0.0 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 9
PM × Wind × Precip
PM scrubbed by 3 hours of recent rain — PM2.5 down to 9.0 µg/m³, PM10 to 9.5 µg/m³.
- PM2.5/PM10
- 0.95
- Wind
- light
- Recent rain
- 3h in last 6h
- Pattern
- washed out
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
- 11:28 PM
- Moonset
- 11:21 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Mercersville at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 13 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Mercersville
- Sat102°76°28%
- Sun95°73°41%
- Mon86°73°79%
- Tue79°68°79%
- Wed73°67°24%
- Thu95°67°12%
- Fri90°71°37%
- Sat83°67°30%
- Sun82°62°22%
- Mon85°56°17%
- Tue92°59°16%
- Wed86°64°39%
- Thu89°61°33%
- Fri93°64°33%
- Sat93°68°31%
- Sun82°69°37%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 — Mercersville
SPC has placed Mercersville in the Slight Risk category for severe thunderstorms tomorrow.
- TODAYMRGLMarginal 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 Mercersville
- 21782