Ontario, Ohio Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Ontario weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast33%—90°70°—
- SundayJul 5Light Drizzle26%0.02″85°71°-5°
- MondayJul 6Thunderstorm43%—77°65°-8°
- TuesdayJul 7Light Drizzle17%—74°63°-3°
- WednesdayJul 8Light Drizzle——83°62°+9°
- ThursdayJul 9Thunderstorm43%—79°63°-4°
- FridayJul 10Thunderstorm47%—77°67°-2°
AQI 31 (Good), driven by Ozone. AQI down 5 over the last 6 hours (gradual decline). Ozone at AQI 47 now. With UV 5.1 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 23 around 1 PM.
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 partly cloudy skies, surface ozone likely climbs to AQI 23 around 1 PM.
- Present
- AQI 47
- UV peak
- 5.1 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 23
PM × Wind × Precip
PM2.5 at 7.5 µg/m³, PM10 at 8.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- Wind
- breezy
- 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
- 11:26 PM
- Moonset
- 10:34 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Ontario at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Ontario
- Sat90°70°33%
- Sun85°71°26%
- Mon77°65°43%
- Tue74°63°17%
- Wed83°62°9%
- Thu79°63°43%
- Fri77°67°47%
- Sat81°65°31%
- Sun71°59°22%
- Mon61°56°13%
- Tue75°59°14%
- Wed81°63°26%
- Thu83°66°26%
- Fri83°68°20%
- Sat82°66°32%
- Sun84°66°36%
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 — Ontario
SPC has placed Ontario 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 Ontario
- 44906
- 44903
- 44862