Castalia, OH Weather & Growing Conditions
Tonight
59°F
Partly Cloudy
Partly cloudy, with a low around 59. East wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Partly Cloudy | 2 to 6 mph E | 2% |
| Saturday | 75°F | Chance Rain Showers | 6 mph E | 54% |
| Saturday Night | 64°F | Showers And Thunderstorms | 6 mph SE | 77% |
| Sunday | 73°F | Showers And Thunderstorms | 5 to 13 mph NW | 86% |
| Sunday Night | 59°F | Rain Showers Likely | 14 mph NE | 59% |
| Monday | 67°F | Chance Rain Showers | 14 to 21 mph NE | 32% |
| Monday Night | 56°F | Chance Rain Showers | 14 to 20 mph NE | 34% |
| Tuesday | 66°F | Chance Rain Showers | 16 to 20 mph NE | 34% |
| Tuesday Night | 56°F | Rain Showers Likely | 12 to 18 mph E | 55% |
| Wednesday | 66°F | Rain Showers Likely | 14 mph E | 55% |
| Wednesday Night | 55°F | Chance Rain Showers | 7 to 13 mph E | 54% |
| Thursday | 68°F | Slight Chance Rain Showers | 7 to 10 mph NE | 24% |
| Thursday Night | 55°F | Slight Chance Rain Showers | 5 to 9 mph NE | 21% |
| Friday | 68°F | Slight Chance Rain Showers | 6 to 10 mph NE | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castalia, OH
Last spring frost
Apr 10
First fall frost
Nov 5
Growing season
209 days
Hardiness zone
6b
Explore more for Castalia, OH: full frost dates · planting calendar · Ohio frost dates
Climate data from the nearest NOAA station, Sandusky, Oh (6.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.