Havana, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Havana, a city in Mason County, Illinois.
Tonight
71°F
Partly Cloudy
Partly cloudy, with a low around 71. East southeast wind around 7 mph, with gusts as high as 16 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Havana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 71°F | Partly Cloudy | 7 mph ESE | 10% |
| Saturday | 90°F | Mostly Cloudy | 7 mph SSW | 13% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 6 mph SSE | 48% |
| Sunday | 80°F | Rain Showers Likely | 1 to 8 mph N | 66% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely | 9 mph NE | 67% |
| Monday | 68°F | Showers And Thunderstorms Likely | 9 mph NE | 67% |
| Monday Night | 54°F | Chance Showers And Thunderstorms | 6 to 9 mph NE | 44% |
| Tuesday | 66°F | Chance Rain Showers | 9 mph NE | 32% |
| Tuesday Night | 51°F | Mostly Cloudy | 3 to 7 mph NNE | 5% |
| Wednesday | 70°F | Mostly Sunny | 3 to 7 mph NNE | 3% |
| Wednesday Night | 53°F | Partly Cloudy | 1 to 5 mph NNE | 1% |
| Thursday | 71°F | Mostly Sunny | 1 to 5 mph NNE | 4% |
| Thursday Night | 55°F | Partly Cloudy | 3 mph NNE | 4% |
| Friday | 73°F | Mostly Sunny | 1 to 5 mph NE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Havana (40.295, -90.058). Updated through the day.
Growing snapshot for Havana
Last spring frost
Apr 17
First fall frost
Oct 19
Growing season
185 days
Hardiness zone
6a
More local growing data for Havana: nearby ZIP 62644 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Havana, Il (1.2 mi from Havana). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.