Brooklyn, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Brooklyn, a village in St. Clair County, Illinois.

Overnight

68°F

Clear

Clear, with a low around 68. Southeast wind around 2 mph.

7-day forecast for Brooklyn

When	Temp	Forecast	Wind	Precip
Overnight	68°F	Clear	2 mph SE	0%
Tuesday	90°F	Sunny	1 to 5 mph SE	0%
Tuesday Night	70°F	Mostly Clear	2 to 6 mph SE	0%
Wednesday	92°F	Sunny	2 to 6 mph S	11%
Wednesday Night	73°F	Slight Chance Showers And Thunderstorms	6 mph S	67%
Thursday	89°F	Showers And Thunderstorms Likely	6 mph S	70%
Thursday Night	72°F	Chance Showers And Thunderstorms	1 to 5 mph SE	35%
Friday	89°F	Chance Showers And Thunderstorms	3 mph SW	35%
Friday Night	73°F	Chance Showers And Thunderstorms	1 to 5 mph S	33%
Saturday	91°F	Chance Showers And Thunderstorms then Mostly Sunny	5 mph S	33%
Saturday Night	74°F	Mostly Clear	6 mph S	7%
Sunday	94°F	Sunny	5 to 8 mph S	7%
Sunday Night	76°F	Mostly Clear	8 mph S	5%
Monday	95°F	Mostly Sunny	5 to 8 mph SW	5%

Forecast source: National Weather Service (api.weather.gov) for Brooklyn (38.654, -90.168). Updated through the day.

Growing snapshot for Brooklyn

Last spring frost

Apr 1

First fall frost

Nov 4

Growing season

218 days

Hardiness zone

More local growing data for Brooklyn: nearby ZIP 62059 weather · frost dates · planting calendar · Illinois frost dates

Nearby towns & communities

Belleville Cahokia Heights Caseyville Darmstadt Dupo East St. Louis Fairmont City Fairview Heights Fayetteville Floraville Freeburg Lebanon Lenzburg Marissa Mascoutah Millstadt New Athens O'Fallon Paderborn Rentchler Sauget Scott AFB Shiloh Smithton St. Libory Summerfield Swansea Washington Park

All Illinois locations ›

Climate data from the nearest NOAA station, St Louis Sci Ctr, Mo (5.5 mi from Brooklyn). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.