Oak Lawn Climate by Month
Oak Lawn, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
The climate in Oak Lawn is one of warm summers and freezing winters, with rain spread through the year. July is the warmest month, with highs around 85°F (29°C); January is the coolest at 33°F (0°C), and nights dip to 17°F (-8°C). About 39 in (1000 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 85°F(29°C)
- Average high, July
- Coldest nights
- 17°F(-8°C)
- Average low, January
- Rain per year
- 39 in(1000 mm)
- No clear rainy season
- Humidity
- 72%
- Sunniest: July
Best and worst months in Oak Lawn
Best for weatherSeptember is the best time for weather in Oak Lawn: highs near 77°F (25°C) and about 3.2 in (81 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 33°F (0°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Oak Lawn weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 33°F(0°C) | 17°F(-8°C) | 2.0 in(51 mm) | 88% | 1.4 |
| FebFebruary | 37°F(3°C) | 21°F(-6°C) | 1.8 in(46 mm) | 74% | 2.5 |
| MarMarch | 48°F(9°C) | 31°F(-1°C) | 2.4 in(61 mm) | 74% | 3.6 |
| AprApril | 60°F(16°C) | 40°F(4°C) | 4.6 in(116 mm) | 65% | 4.5 |
| MayMay | 72°F(22°C) | 50°F(10°C) | 4.5 in(114 mm) | 66% | 5.1 |
| JunJune | 81°F(27°C) | 60°F(16°C) | 4.6 in(116 mm) | 66% | 5.8 |
| JulJuly | 85°F(29°C) | 65°F(18°C) | 3.9 in(98 mm) | 68% | 5.9 |
| AugAugust | 83°F(28°C) | 64°F(18°C) | 4.3 in(108 mm) | 72% | 5.1 |
| SepSeptemberBest | 77°F(25°C) | 56°F(13°C) | 3.2 in(81 mm) | 68% | 4.3 |
| OctOctober | 64°F(18°C) | 44°F(7°C) | 3.1 in(78 mm) | 63% | 2.8 |
| NovNovember | 49°F(10°C) | 33°F(1°C) | 2.8 in(72 mm) | 68% | 1.7 |
| DecDecember | 37°F(3°C) | 23°F(-5°C) | 2.3 in(59 mm) | 89% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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