Lockport, Illinois Climate by Month
Lockport, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
The climate in Lockport 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 16°F (-9°C). About 39 in (985 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 85°F(29°C)
- Average high, July
- Coldest nights
- 16°F(-9°C)
- Average low, January
- Rain per year
- 39 in(985 mm)
- No clear rainy season
- Humidity
- 73%
- Sunniest: July
Best and worst months in Lockport
Best for weatherSeptember is the best time for weather in Lockport: highs near 77°F (25°C) and about 3.4 in (87 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)
Lockport weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 33°F(0°C) | 16°F(-9°C) | 1.8 in(45 mm) | 89% | 1.4 |
| FebFebruary | 37°F(3°C) | 20°F(-7°C) | 1.6 in(41 mm) | 76% | 2.5 |
| MarMarch | 49°F(9°C) | 30°F(-1°C) | 2.4 in(60 mm) | 74% | 3.6 |
| AprApril | 61°F(16°C) | 39°F(4°C) | 4.5 in(115 mm) | 65% | 4.5 |
| MayMay | 73°F(23°C) | 49°F(10°C) | 4.5 in(115 mm) | 66% | 5.2 |
| JunJune | 82°F(28°C) | 59°F(15°C) | 4.7 in(120 mm) | 67% | 5.8 |
| JulJuly | 85°F(29°C) | 64°F(18°C) | 4.0 in(101 mm) | 69% | 6.0 |
| AugAugust | 83°F(28°C) | 62°F(17°C) | 4.1 in(104 mm) | 73% | 5.2 |
| SepSeptemberBest | 77°F(25°C) | 54°F(12°C) | 3.4 in(87 mm) | 70% | 4.4 |
| OctOctober | 65°F(18°C) | 43°F(6°C) | 3.0 in(75 mm) | 64% | 2.8 |
| NovNovember | 50°F(10°C) | 32°F(0°C) | 2.6 in(66 mm) | 69% | 1.7 |
| DecDecember | 37°F(3°C) | 22°F(-6°C) | 2.2 in(56 mm) | 90% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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