St. Marys, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
St. Marys weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain48%0.57″87°67°—
- SundayJul 5Rain79%0.11″83°66°-4°
- MondayJul 6Thunderstorm76%0.65″74°64°-9°
- TuesdayJul 7Light Drizzle51%—81°60°+7°
- WednesdayJul 8Partly Cloudy11%—84°57°+3°
- ThursdayJul 9Light Drizzle45%0.01″87°60°+3°
- FridayJul 10Light Drizzle48%—77°63°-10°
AQI 48 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 43 now. With UV 4.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 16 around 1 PM.
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 43 now. With UV 4.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 16 around 1 PM.
- Present
- AQI 43
- UV peak
- 4.0 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 16
PM × Wind × Precip
PM2.5 at 6.9 µg/m³, PM10 at 7.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.96
- Wind
- light
- Recent rain
- 0h 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
- 11:10 PM
- Moonset
- 10:16 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
St. Marys at a glance
- Today vs. normal: 72°F — typical for the season
- Last frost: April 25 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — St. Marys
- Sat87°67°48%
- Sun83°66°79%
- Mon74°64°76%
- Tue81°60°51%
- Wed84°57°11%
- Thu87°60°45%
- Fri77°63°48%
- Sat86°64°30%
- Sun76°60°29%
- Mon74°60°17%
- Tue77°60°19%
- Wed82°64°28%
- Thu90°63°39%
- Fri83°66°45%
- Sat82°66°40%
- Sun85°60°41%
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 — St. Marys
SPC has placed St. Marys in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- 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 St. Marys
- 15857