Anna, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Anna, a city in Union County, Illinois.
Tonight
71°F
Slight Chance Showers And Thunderstorms then Partly Cloudy
A slight chance of showers and thunderstorms before 8pm. Partly cloudy. Low around 71, with temperatures rising to around 73 overnight. South southeast wind around 2 mph. Chance of precipitation is 20%.
7-day forecast for Anna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph SSE | 18% |
| Saturday | 98°F | Sunny | 2 to 6 mph SW | 3% |
| Saturday Night | 72°F | Partly Cloudy | 3 mph SSW | 0% |
| Sunday | 97°F | Sunny | 2 to 7 mph WSW | 3% |
| Sunday Night | 70°F | Partly Cloudy | 3 mph N | 7% |
| Monday | 89°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph N | 45% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 5 to 8 mph N | 45% |
| Tuesday | 77°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 7 to 12 mph N | 15% |
| Tuesday Night | 58°F | Partly Cloudy | 5 to 12 mph N | 8% |
| Wednesday | 77°F | Mostly Sunny | 8 mph N | 3% |
| Wednesday Night | 57°F | Partly Cloudy | 3 to 7 mph NNE | 2% |
| Thursday | 77°F | Mostly Sunny | 3 to 8 mph N | 3% |
| Thursday Night | 59°F | Partly Cloudy | 3 to 7 mph NNE | 3% |
| Friday | 77°F | Mostly Sunny | 5 to 8 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Anna (37.461, -89.237). Updated through the day.
Growing snapshot for Anna
Last spring frost
Apr 8
First fall frost
Oct 29
Growing season
203 days
Hardiness zone
7a
More local growing data for Anna: nearby ZIP 62906 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Anna 2 Nne, Il (3.4 mi from Anna). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.