Ottawa, Ohio Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Ottawa weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast22%—89°71°—
- SundayJul 5Light Rain68%0.09″77°70°-12°
- MondayJul 6Overcast23%—79°67°+2°
- TuesdayJul 7Overcast——81°62°+2°
- WednesdayJul 8Overcast——84°63°+3°
- ThursdayJul 9Thunderstorm39%—82°66°-2°
- FridayJul 10Light Drizzle36%—81°69°-1°
AQI 37 (Good), driven by PM2.5. AQI down 10 over the last 6 hours (gradual decline). PM2.5 at 7.5 µg/m³, PM10 at 8.2 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 7 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 42 now. With UV 3.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 20 around 1 PM.
- Present
- AQI 42
- UV peak
- 3.6 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 20
PM × Wind × Precip
PM2.5 at 7.5 µg/m³, PM10 at 8.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.91
- 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
- 11:32 PM
- Moonset
- 10:40 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Ottawa at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 22 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 45875
16-Day Forecast — Ottawa
- Sat89°71°22%
- Sun77°70°68%
- Mon79°67°23%
- Tue81°62°7%
- Wed84°63°9%
- Thu82°66°39%
- Fri81°69°36%
- Sat83°65°23%
- Sun76°60°19%
- Mon64°60°8%
- Tue75°61°14%
- Wed83°63°29%
- Thu84°67°32%
- Fri85°69°20%
- Sat85°67°29%
- Sun87°69°29%
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 — Ottawa
SPC has placed Ottawa 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 Ottawa
- 45875