Brooklyn, IL Weather & Growing Conditions
Overnight
56°F
Slight Chance Drizzle
A slight chance of drizzle. Mostly cloudy, with a low around 56. Southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Slight Chance Drizzle | 7 mph SW | 12% |
| Wednesday | 61°F | Slight Chance Drizzle then Mostly Cloudy | 7 to 13 mph W | 12% |
| Wednesday Night | 46°F | Partly Cloudy | 6 mph W | 0% |
| Thursday | 66°F | Sunny | 6 to 9 mph W | 0% |
| Thursday Night | 48°F | Mostly Cloudy | 6 mph NW | 3% |
| Friday | 59°F | Partly Sunny | 6 to 10 mph N | 1% |
| Friday Night | 38°F | Partly Cloudy | 1 to 7 mph N | 0% |
| Saturday | 57°F | Mostly Sunny | 1 to 5 mph N | 0% |
| Saturday Night | 37°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 62°F | Sunny | 1 to 6 mph NW | 1% |
| Sunday Night | 38°F | Clear | 2 mph W | 0% |
| Monday | 67°F | Sunny | 0 to 5 mph W | 0% |
| Monday Night | 43°F | Clear | 2 mph SW | 0% |
| Tuesday | 70°F | Sunny | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Brooklyn, IL
Last spring frost
Apr 1
First fall frost
Nov 4
Growing season
218 days
Hardiness zone
7a
Explore more for Brooklyn, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, St Louis Sci Ctr, Mo (5.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.