Forest Lake, Illinois Climate
United States
Pop. 1,659 Elev. 255 m / 837 ft
TZ: America/Chicago (UTC-5) ·
Forest Lake is largely arid, with warm summers peaking at 82°F (28°C) in July and cold winters around 17°F (-8°C) in January. Humidity pushes the summer feels-like temperature to 88°F (31°C), while wind chill can drive winter lows to 7°F (-14°C). Precipitation occurs on roughly 40 days per year (29.3 in / 745 mm total), with snow on 5 days and 38 in (954 mm) of annual accumulation. The city averages 117 sunny days per year and around 27 thunderstorm days. Ocean water temperatures reach 74°F (23°C) in summer.
| Temperature | 82°F (28°C) high | 17°F (-8°C) low |
| Feels like | 88°F (31°C) high | 7°F (-14°C) low |
| Rain | 40 days | 29.3 in (745 mm) /yr |
| Snow | 5 days | 37.6 in (954 mm) /yr |
| Sky | 117 sunny | 27 stormy |
| Wind | 2.9 mph (1.3 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Aug, Sep, Oct
Sky & Air by Month
Cloud cover (%)
56
Jan 66
Feb 59
Mar 66
Apr 62
May 53
Jun 59
Jul 49
Aug 34
Sep 45
Oct 59
Nov 79
Dec Humidity (%)
59
Jan 67
Feb 63
Mar 66
Apr 72
May 71
Jun 77
Jul 73
Aug 72
Sep 70
Oct 68
Nov 73
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 18 mi Chicago O'Hare International Airport (ORD)
Ski resort 8 mi Norge Ski Club
National park 42 mi Pullman National Historical Park
Hospital 5 mi Hospice & Palliative Care of Northeastern Illinois
Hiking trail 11 mi Central Loop Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 30°F -1°C | 17°F -8°C | 0.8 in 20 mm | 4.0 in101 mm | 10 |
| February | 33°F 1°C | 20°F -7°C | 0.3 in 7 mm | 9.6 in243 mm | 4 |
| March | 53°F 11°C | 35°F 1°C | 3.2 in 81 mm | 4.9 in123 mm | 8 |
| April | 56°F 13°C | 42°F 5°C | 2.9 in 74 mm | 0.1 in4 mm | 5 |
| May | 61°F 16°C | 48°F 9°C | 3.8 in 95 mm | — | 9 |
| June | 78°F 26°C | 63°F 17°C | 4.2 in 106 mm | — | 10 |
| July | 82°F 28°C | 69°F 21°C | 4.5 in 115 mm | — | 9 |
| August | 78°F 26°C | 66°F 19°C | 2.4 in 62 mm | — | 15 |
| September | 74°F 24°C | 60°F 15°C | 1.6 in 42 mm | — | 18 |
| October | 64°F 18°C | 52°F 11°C | 2.4 in 61 mm | — | 17 |
| November | 48°F 9°C | 37°F 3°C | 1.3 in 34 mm | 11.3 in288 mm | 11 |
| December | 35°F 1°C | 22°F -5°C | 1.9 in 49 mm | 7.7 in195 mm | 1 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 10 | 1 |
| February | 4 | 0 |
| March | 8 | 3 |
| April | 5 | 1 |
| May | 9 | 3 |
| June | 10 | 3 |
| July | 9 | 5 |
| August | 15 | 4 |
| September | 18 | 4 |
| October | 17 | 2 |
| November | 11 | 0 |
| December | 1 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 38°F 3°C | 33°F 0°C |
| February | 34°F 1°C | 32°F 0°C |
| March | 36°F 2°C | 37°F 3°C |
| April | 42°F 6°C | 46°F 8°C |
| May | 48°F 9°C | 53°F 12°C |
| June | 66°F 19°C | 65°F 19°C |
| July | 74°F 23°C | 75°F 24°C |
| August | 73°F 23°C | 73°F 23°C |
| September | 69°F 20°C | 66°F 19°C |
| October | 67°F 19°C | 59°F 15°C |
| November | 51°F 11°C | 44°F 7°C |
| December | 43°F 6°C | 34°F 1°C |