Havana, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Havana, a city in Mason County, Illinois.
Overnight
55°F
Mostly Cloudy
Mostly cloudy, with a low around 55. Southwest wind around 12 mph, with gusts as high as 23 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Havana
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Mostly Cloudy | 12 mph SW | 13% |
| Wednesday | 58°F | Patchy Drizzle | 12 to 15 mph WSW | 10% |
| Wednesday Night | 46°F | Patchy Drizzle then Mostly Cloudy | 12 mph WSW | 10% |
| Thursday | 59°F | Mostly Cloudy then Slight Chance Light Rain | 9 to 13 mph W | 16% |
| Thursday Night | 42°F | Slight Chance Light Rain then Mostly Cloudy | 7 mph NW | 17% |
| Friday | 54°F | Partly Sunny | 9 mph N | 7% |
| Friday Night | 32°F | Partly Cloudy | 0 to 6 mph N | 0% |
| Saturday | 54°F | Sunny | 0 to 3 mph NNW | 0% |
| Saturday Night | 32°F | Mostly Clear | 1 mph WNW | 1% |
| Sunday | 60°F | Sunny | 1 to 6 mph W | 1% |
| Sunday Night | 34°F | Clear | 2 mph W | 1% |
| Monday | 65°F | Sunny | 0 to 6 mph SW | 0% |
| Monday Night | 38°F | Clear | 3 mph WSW | 0% |
| Tuesday | 66°F | Sunny | 3 mph WNW | 0% |
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 Nov 4, 2026.