Naperville Climate by Month
Naperville, Illinois, United States
Warm summers and freezing winters, with rain spread through the year.
The climate in Naperville is one of warm summers and freezing winters, with rain spread through the year. Expect highs of 85°F (30°C) in July and 32°F (0°C) in January, with the coldest nights (January) near 16°F (-9°C). About 39 in (994 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 85°F(30°C)
- Average high, July
- Coldest nights
- 16°F(-9°C)
- Average low, January
- Rain per year
- 39 in(994 mm)
- No clear rainy season
- Humidity
- 72%
- Sunniest: July
Best and worst months in Naperville
Best for weatherSeptember is the best time for weather in Naperville: highs near 77°F (25°C) and about 3.5 in (89 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 32°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)
Naperville weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 32°F(0°C) | 16°F(-9°C) | 1.8 in(46 mm) | 91% | 1.4 |
| FebFebruary | 37°F(3°C) | 19°F(-7°C) | 1.7 in(43 mm) | 77% | 2.5 |
| MarMarch | 49°F(9°C) | 29°F(-1°C) | 2.3 in(59 mm) | 74% | 3.6 |
| AprApril | 61°F(16°C) | 38°F(4°C) | 4.4 in(113 mm) | 66% | 4.5 |
| MayMay | 73°F(23°C) | 49°F(9°C) | 4.7 in(119 mm) | 67% | 5.1 |
| JunJune | 82°F(28°C) | 58°F(15°C) | 4.8 in(122 mm) | 68% | 5.8 |
| JulJuly | 85°F(30°C) | 63°F(17°C) | 3.9 in(99 mm) | 69% | 5.9 |
| AugAugust | 83°F(28°C) | 62°F(17°C) | 4.2 in(107 mm) | 74% | 5.1 |
| SepSeptemberBest | 77°F(25°C) | 54°F(12°C) | 3.5 in(89 mm) | 71% | 4.3 |
| OctOctober | 64°F(18°C) | 42°F(6°C) | 3.0 in(76 mm) | 65% | 2.8 |
| NovNovember | 49°F(10°C) | 31°F(0°C) | 2.6 in(67 mm) | 71% | 1.7 |
| DecDecember | 37°F(3°C) | 21°F(-6°C) | 2.1 in(54 mm) | 74% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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