Harman US

Ottawa, OH Weather & Growing Conditions

Overnight
57°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 57. East wind around 5 mph. Chance of precipitation is 20%.

7-day forecast

WhenTempForecastWindPrecip
Overnight 57°F Slight Chance Showers And Thunderstorms 5 mph E 15%
Saturday 76°F Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 5 mph E 67%
Saturday Night 64°F Chance Showers And Thunderstorms 5 mph S 75%
Sunday 75°F Showers And Thunderstorms 5 to 15 mph NW 86%
Sunday Night 54°F Showers And Thunderstorms Likely 15 mph NE 61%
Monday 66°F Chance Rain Showers 15 to 20 mph NE 47%
Monday Night 51°F Chance Rain Showers 15 to 20 mph NE 37%
Tuesday 65°F Mostly Cloudy then Slight Chance Rain Showers 15 to 20 mph NE 19%
Tuesday Night 52°F Chance Rain Showers 15 to 20 mph NE 52%
Wednesday 66°F Chance Rain Showers 15 mph NE 52%
Wednesday Night 52°F Chance Showers And Thunderstorms 5 to 15 mph NE 51%
Thursday 68°F Mostly Cloudy 10 mph NE 13%
Thursday Night 51°F Mostly Cloudy 5 to 10 mph NE 11%
Friday 70°F Mostly Sunny 5 to 10 mph NE 10%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Ottawa, OH

Last spring frost
Apr 23
First fall frost
Oct 22
Growing season
180 days
Hardiness zone
6a

Explore more for Ottawa, OH: full frost dates · planting calendar · Ohio frost dates

Climate data from the nearest NOAA station, Pandora, Oh (7.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.