Waukegan Climate by Month
Waukegan, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
Warm summers and freezing winters, with rain spread through the year: that's Waukegan's climate in short. July is the warmest month, with highs around 80°F (27°C); January is the coolest at 31°F (0°C), and nights dip to 16°F (-9°C). It gets 36 in (911 mm) of rain a year, spread across the months.
- Warmest month
- 80°F(27°C)
- Average high, July
- Coldest nights
- 16°F(-9°C)
- Average low, January
- Rain per year
- 36 in(911 mm)
- No clear rainy season
- Humidity
- 74%
- Sunniest: July
Best and worst months in Waukegan
Best for weatherThe most comfortable weather comes in June and September, with highs around 74°F (24°C) and about 3.6 in (93 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 31°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 June.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Waukegan weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 31°F(0°C) | 16°F(-9°C) | 1.9 in(48 mm) | 92% | 1.4 |
| FebFebruary | 35°F(2°C) | 19°F(-7°C) | 1.6 in(41 mm) | 79% | 2.4 |
| MarMarch | 44°F(7°C) | 28°F(-2°C) | 2.2 in(57 mm) | 69% | 3.5 |
| AprApril | 56°F(13°C) | 37°F(3°C) | 4.1 in(104 mm) | 65% | 4.5 |
| MayMay | 67°F(19°C) | 46°F(8°C) | 4.1 in(105 mm) | 70% | 5.1 |
| JunJuneBest | 76°F(24°C) | 55°F(13°C) | 3.9 in(100 mm) | 75% | 5.9 |
| JulJuly | 80°F(27°C) | 61°F(16°C) | 3.3 in(85 mm) | 74% | 5.9 |
| AugAugust | 79°F(26°C) | 61°F(16°C) | 4.2 in(106 mm) | 76% | 5.1 |
| SepSeptemberBest | 73°F(23°C) | 54°F(12°C) | 3.3 in(85 mm) | 75% | 4.3 |
| OctOctober | 62°F(17°C) | 42°F(6°C) | 2.8 in(70 mm) | 68% | 2.7 |
| NovNovember | 47°F(9°C) | 32°F(0°C) | 2.2 in(56 mm) | 73% | 1.7 |
| DecDecember | 35°F(2°C) | 21°F(-6°C) | 2.1 in(54 mm) | 76% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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