St. Marys, Ohio Weather
Cicadas claim the scorching 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 4Overcast25%—89°69°—
- SundayJul 5Overcast30%—85°70°-4°
- MondayJul 6Light Drizzle30%—79°66°-6°
- TuesdayJul 7Light Drizzle——80°62°+1°
- WednesdayJul 8Mostly Clear11%—83°63°+3°
- ThursdayJul 9Thunderstorm47%—80°65°-3°
- FridayJul 10Light Drizzle49%0.01″78°70°-2°
AQI 33 (Good), driven by PM2.5. AQI down 6 over the last 6 hours (gradual decline). PM2.5 at 10.2 µg/m³, PM10 at 12.0 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 8 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 47 now. With UV 5.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 32 around 1 PM.
- Present
- AQI 47
- UV peak
- 5.1 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 32
PM × Wind × Precip
PM2.5 at 10.2 µg/m³, PM10 at 12.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.85
- 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
- 11:33 PM
- Moonset
- 10:42 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
St. Marys at a glance
- Today vs. normal: 10°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.
16-Day Forecast — St. Marys
- Sat89°69°25%
- Sun85°70°30%
- Mon79°66°30%
- Tue80°62°7%
- Wed83°63°11%
- Thu80°65°47%
- Fri78°70°49%
- Sat84°65°26%
- Sun74°59°21%
- Mon64°59°10%
- Tue74°60°14%
- Wed82°62°39%
- Thu85°66°25%
- Fri81°69°19%
- Sat85°67°35%
- Sun87°70°26%
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 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 St. Marys
- 45885