Anna, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Anna, a city in Union County, Illinois.
This Afternoon
76°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms between 4pm and 5pm, then a chance of showers and thunderstorms. Partly sunny. High near 76, with temperatures falling to around 73 in the afternoon. South wind around 20 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
7-day forecast for Anna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Slight Chance Showers And Thunderstorms | 20 mph S | 31% |
| Tonight | 56°F | Showers And Thunderstorms | 7 to 15 mph S | 99% |
| Wednesday | 67°F | Partly Sunny | 5 to 9 mph WSW | 6% |
| Wednesday Night | 44°F | Mostly Clear | 3 mph SW | 0% |
| Thursday | 67°F | Sunny | 2 to 7 mph SW | 0% |
| Thursday Night | 46°F | Partly Cloudy | 3 mph WNW | 5% |
| Friday | 60°F | Partly Sunny | 3 to 9 mph NNW | 1% |
| Friday Night | 40°F | Partly Cloudy | 6 mph NNW | 1% |
| Saturday | 57°F | Mostly Sunny | 5 mph NNW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 61°F | Sunny | 1 to 6 mph WNW | 5% |
| Sunday Night | 36°F | Mostly Clear | 3 mph NW | 5% |
| Monday | 64°F | Sunny | 1 to 7 mph W | 2% |
| Monday Night | 39°F | Mostly Clear | 3 mph SW | 0% |
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 Nov 3, 2026.