Johnstown, OH Weather & Growing Conditions
Overnight
59°F
Slight Chance Light Rain
A slight chance of rain after 5am. Mostly cloudy, with a low around 59. Southeast wind around 13 mph, with gusts as high as 24 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Slight Chance Light Rain | 13 mph SE | 20% |
| Wednesday | 64°F | Rain | 13 to 16 mph S | 96% |
| Wednesday Night | 52°F | Light Rain then Mostly Cloudy | 8 to 16 mph SW | 75% |
| Thursday | 63°F | Partly Sunny | 8 to 15 mph SW | 0% |
| Thursday Night | 46°F | Partly Cloudy | 3 to 8 mph SW | 0% |
| Friday | 56°F | Chance Light Rain | 3 to 9 mph W | 47% |
| Friday Night | 39°F | Chance Light Rain then Mostly Cloudy | 9 mph NW | 47% |
| Saturday | 51°F | Slight Chance Light Rain | 12 mph NW | 15% |
| Saturday Night | 35°F | Partly Cloudy | 7 mph NW | 7% |
| Sunday | 54°F | Mostly Sunny | 5 to 12 mph W | 3% |
| Sunday Night | 35°F | Mostly Clear | 6 to 9 mph W | 3% |
| Monday | 56°F | Sunny | 6 to 10 mph W | 4% |
| Monday Night | 37°F | Mostly Clear | 8 mph SW | 2% |
| Tuesday | 61°F | Sunny | 8 to 12 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Johnstown, OH
Last spring frost
Apr 27
First fall frost
Oct 17
Growing season
172 days
Hardiness zone
6a
Explore more for Johnstown, OH: full frost dates · planting calendar · Ohio frost dates
Climate data from the nearest NOAA station, Centerburg 2 Se, Oh (8.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.