Castalia, OH Weather & Growing Conditions
Today
81°F
Sunny
Sunny, with a high near 81. East wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Sunny | 0 to 3 mph E | 0% |
| Tonight | 62°F | Mostly Clear | 0 to 3 mph E | 0% |
| Wednesday | 86°F | Sunny | 0 to 3 mph SW | 3% |
| Wednesday Night | 66°F | Partly Cloudy | 3 mph S | 6% |
| Thursday | 85°F | Mostly Sunny then Chance Showers And Thunderstorms | 7 mph SW | 51% |
| Thursday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph SW | 58% |
| Friday | 83°F | Showers And Thunderstorms Likely | 6 mph SW | 56% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 5 mph SW | 46% |
| Saturday | 85°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 17% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 6 mph SW | 19% |
| Sunday | 88°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 6 to 13 mph SW | 19% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms | 7 to 12 mph SW | 38% |
| Monday | 87°F | Chance Rain Showers | 12 mph SW | 42% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 9 mph SW | 52% |
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 Aug 4, 2026.