Oak Forest, Illinois Climate
United States
Pop. 28,074 Elev. 206 m / 676 ft
TZ: America/Chicago (UTC-5) ·
Oak Forest has warm summers with average highs of 85°F (29°C) in July, and frigid winters averaging 16°F (-9°C) in January. Humidity pushes the summer feels-like temperature to 95°F (35°C), while wind chill can drive winter lows to 7°F (-14°C). Rain falls on about 50 days per year (36.3 in / 923 mm total), with snow on 7 days and 38 in (965 mm) of annual accumulation. The city averages 110 sunny days per year and around 39 thunderstorm days. Ocean water temperatures reach 77°F (25°C) in summer.
| Temperature | 85°F (30°C) high | 16°F (-9°C) low |
| Feels like | 95°F (35°C) high | 7°F (-14°C) low |
| Rain | 50 days | 36.3 in (923 mm) /yr |
| Snow | 7 days | 38.0 in (965 mm) /yr |
| Sky | 110 sunny | 39 stormy |
| Wind | 2.7 mph (1.2 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Apr, Aug, Sep
Sky & Air by Month
Cloud cover (%)
57
Jan 66
Feb 57
Mar 66
Apr 63
May 54
Jun 63
Jul 53
Aug 35
Sep 47
Oct 58
Nov 76
Dec Humidity (%)
61
Jan 65
Feb 60
Mar 61
Apr 67
May 67
Jun 73
Jul 73
Aug 68
Sep 66
Oct 68
Nov 77
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 13 mi Chicago Midway International Airport (MDW)
Ski resort 22 mi Bunny Hill
National park 9 mi Historic Pullman Foundation Exhibit Hall
Hospital 3 mi Advocate South Suburban Hospital
Hiking trail 4 mi OBT-5
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 31°F -1°C | 16°F -9°C | 0.6 in 16 mm | 6.6 in167 mm | 14 |
| February | 36°F 2°C | 21°F -6°C | 0.2 in 5 mm | 7.4 in189 mm | 4 |
| March | 58°F 15°C | 36°F 2°C | 3.9 in 99 mm | 4.3 in109 mm | 9 |
| April | 61°F 16°C | 43°F 6°C | 3.5 in 90 mm | 0.1 in4 mm | 8 |
| May | 68°F 20°C | 50°F 10°C | 4.4 in 113 mm | — | 7 |
| June | 83°F 28°C | 65°F 18°C | 5.9 in 151 mm | — | 10 |
| July | 85°F 30°C | 70°F 21°C | 5.4 in 136 mm | — | 6 |
| August | 80°F 27°C | 64°F 18°C | 3.5 in 89 mm | — | 9 |
| September | 79°F 26°C | 56°F 14°C | 1.5 in 38 mm | — | 18 |
| October | 67°F 19°C | 49°F 9°C | 4.3 in 109 mm | — | 13 |
| November | 50°F 10°C | 36°F 2°C | 1.2 in 31 mm | 11.5 in293 mm | 9 |
| December | 36°F 2°C | 21°F -6°C | 1.8 in 46 mm | 8.0 in204 mm | 3 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 1 |
| February | 4 | 0 |
| March | 9 | 6 |
| April | 8 | 2 |
| May | 7 | 5 |
| June | 10 | 5 |
| July | 6 | 8 |
| August | 9 | 5 |
| September | 18 | 3 |
| October | 13 | 3 |
| November | 9 | 0 |
| December | 3 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 36°F 2°C | 32°F 0°C |
| February | 33°F 1°C | 32°F 0°C |
| March | 38°F 4°C | 40°F 4°C |
| April | 47°F 8°C | 49°F 10°C |
| May | 54°F 12°C | 57°F 14°C |
| June | 71°F 22°C | 70°F 21°C |
| July | 76°F 25°C | 78°F 25°C |
| August | 77°F 25°C | 74°F 23°C |
| September | 69°F 21°C | 68°F 20°C |
| October | 66°F 19°C | 59°F 15°C |
| November | 53°F 12°C | 44°F 6°C |
| December | 43°F 6°C | 33°F 1°C |