Brooklyn, IL Weather & Growing Conditions

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

Tonight

55°F

Rain

Rain before 3am, then a slight chance of drizzle. Mostly cloudy, with a low around 55. Southwest wind 8 to 12 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.

7-day forecast for Brooklyn

When	Temp	Forecast	Wind	Precip
Tonight	55°F	Rain	8 to 12 mph SW	77%
Wednesday	64°F	Slight Chance Drizzle then Mostly Cloudy	7 to 13 mph W	10%
Wednesday Night	46°F	Partly Cloudy	6 mph W	0%
Thursday	66°F	Sunny	6 to 9 mph W	1%
Thursday Night	46°F	Mostly Cloudy	5 mph NW	9%
Friday	59°F	Mostly Cloudy	5 to 9 mph NW	5%
Friday Night	41°F	Mostly Cloudy	2 to 7 mph N	1%
Saturday	57°F	Partly Sunny	5 mph NW	0%
Saturday Night	39°F	Partly Cloudy	1 mph NW	0%
Sunday	63°F	Sunny	1 to 6 mph W	8%
Sunday Night	39°F	Mostly Clear	5 mph W	5%
Monday	67°F	Sunny	2 to 6 mph SW	2%
Monday Night	43°F	Mostly Clear	3 mph SW	1%
Tuesday	70°F	Sunny	5 mph W	0%

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 Nov 4, 2026.