Lake Barrington, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake Barrington, a village in Mchenry County, Illinois.
Today
76°F
Showers And Thunderstorms
Showers and thunderstorms before 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then showers and thunderstorms likely. Cloudy. High near 76, with temperatures falling to around 73 in the afternoon. South southeast wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Lake Barrington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Showers And Thunderstorms | 5 to 10 mph SSE | 100% |
| Tonight | 61°F | Showers And Thunderstorms | 5 to 10 mph ENE | 94% |
| Sunday | 68°F | Showers And Thunderstorms Likely | 10 to 15 mph NNE | 56% |
| Sunday Night | 54°F | Slight Chance Rain Showers | 15 mph NE | 18% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 25% |
| Monday Night | 50°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph ENE | 16% |
| Tuesday | 61°F | Mostly Cloudy | 10 to 15 mph NE | 12% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Wednesday | 63°F | Partly Sunny | 5 to 10 mph NE | 11% |
| Wednesday Night | 50°F | Mostly Cloudy | 0 to 10 mph NNE | 4% |
| Thursday | 66°F | Partly Sunny | 5 mph NNE | 5% |
| Thursday Night | 50°F | Mostly Cloudy | 0 to 5 mph NNE | 4% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph NE | 5% |
| Friday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Lake Barrington (42.210, -88.169). Updated through the day.
Growing snapshot for Lake Barrington
Last spring frost
Apr 25
First fall frost
Oct 19
Growing season
177 days
Hardiness zone
5b
More local growing data for Lake Barrington: nearby ZIP 60021 weather · frost dates · planting calendar · Illinois frost dates
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Climate data from the nearest NOAA station, Barrington 3Sw, Il (6.1 mi from Lake Barrington). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.