Naperville, United States experiences average highs of 16°C (61°F) and lows of 7°C (45°F) throughout the year. Rainfall is moderate, averaging about 10 rainy days per month. Average highs have stayed broadly stable across the available records.
Naperville, United States Weather & Climate 2026
Monthly climate averages for Naperville, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.2/10
Best: June, July, August, September, October
UV Index
5
Low
Temperature 16°C / 7°C
Feels Like 14°C / 4°C
Rainy Days 10
Rainfall 87 mm
Sunshine 8 h
Humidity 71%
Wind Speed 19 km/h
Dew Point 6°C
Snow Days 5 days
Frost Days 15 days
Hottest Month
28°C
July
Avg Low19°C
Rain12days
Coldest Month
-7°C
January
Avg High0°C
Rain9days
Driest Month
7days
November
Avg High9°C
Avg Low2°C
Windiest Month
22 km/h
April (Gusts 46)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures.
Sun Position
Sunrise 05:19
Daylight 15.2h
Sunset 20:30
Live conditions—
Naperville on the map · live conditions
Naperville, United States
- Continent
- Americas
- Country
- United States
- City
- Naperville
- Population
- 147.1K
- Elevation
- 216 m
- Coordinates
- 41.79°, -88.15°
Seasonal Breakdown
Spring
Mar–May
Avg High 15°C
Avg Low 5°C
Rain 13 days/mo
Summer
Jun–Aug
Avg High 28°C
Avg Low 18°C
Rain 11 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 17°C
Avg Low 9°C
Rain 8 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 2°C
Avg Low -5°C
Rain 8 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 0°C / -7°C . Feb: 3°C / -5°C . Mar: 10°C / 0°C . Apr: 15°C / 5°C . May: 21°C / 11°C . Jun: 27°C / 17°C . Jul: 28°C / 19°C . Aug: 27°C / 19°C . Sep: 25°C / 16°C . Oct: 17°C / 9°C . Nov: 9°C / 2°C . Dec: 4°C / -3°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 61 mm. Feb: 52 mm. Mar: 94 mm. Apr: 113 mm. May: 124 mm. Jun: 115 mm. Jul: 115 mm. Aug: 86 mm. Sep: 78 mm. Oct: 95 mm. Nov: 55 mm. Dec: 55 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 74%. Feb: 69%. Mar: 68%. Apr: 67%. May: 70%. Jun: 69%. Jul: 73%. Aug: 73%. Sep: 71%. Oct: 70%. Nov: 70%. Dec: 73%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 20 km/h . Mar: 21 km/h . Apr: 22 km/h . May: 19 km/h . Jun: 18 km/h . Jul: 15 km/h . Aug: 15 km/h . Sep: 16 km/h . Oct: 19 km/h . Nov: 20 km/h . Dec: 19 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 7h. Mar: 8h. Apr: 9h. May: 10h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 7h. Nov: 6h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 5. Apr: UV 5. May: UV 7. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 5. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 10 days. Feb: 8 days. Mar: 5 days. Apr: 3 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 1 days. Nov: 3 days. Dec: 6 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 29°C | Jul · 28°C |
| Coldest month | Jan 2025 · -9°C | Jan · -7°C |
| Wettest month | Jul 2025 · 122 mm | May · 124 mm |
| Windiest month | Mar 2025 · 24 km/h | Apr · 22 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October best
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 0°C / -7°C | -4°C / -12°C | 9days (61 mm) Wet | 4.9h Fair | 74% Muggy | 2.1 Moderate | Poor | View Details |
| February | 3°C / -5°C | -1°C / -10°C | 8days (52 mm) Wet | 6.8h Fair | 69% Muggy | 3.4 Moderate | Poor | View Details |
| March | 10°C / 0°C | 6°C / -4°C | 11days (94 mm) Wet | 7.5h Good | 68% Muggy | 4.5 Moderate | Poor | View Details |
| April | 15°C / 5°C | 13°C / 1°C | 13days (113 mm) Wet | 8.5h Good | 67% Muggy | 5.4 High | Fair | View Details |
| May | 21°C / 11°C | 21°C / 9°C | 14days (124 mm) Wet | 9.8h Good | 70% Muggy | 6.7 High | Good | View Details |
| June best | 27°C / 17°C | 29°C / 17°C | 12days (115 mm) Wet | 11.5h Excellent | 69% Muggy | 7.1 Very High | Excellent | View Details |
| July best | 28°C / 19°C | 31°C / 21°C | 12days (115 mm) Wet | 11.5h Excellent | 73% Muggy | 7 High | Excellent | View Details |
| August best | 27°C / 19°C | 30°C / 20°C | 10days (86 mm) Wet | 11h Excellent | 73% Muggy | 6.6 High | Excellent | View Details |
| September best | 25°C / 16°C | 25°C / 16°C | 9days (78 mm) Wet | 9.3h Good | 71% Muggy | 5.3 High | Excellent | View Details |
| October best | 17°C / 9°C | 16°C / 7°C | 9days (95 mm) Wet | 7.1h Good | 70% Muggy | 3.8 Moderate | Good | View Details |
| November | 9°C / 2°C | 6°C / -2°C | 7days (55 mm) Good | 6h Fair | 70% Muggy | 2.6 Moderate | Poor | View Details |
| December | 4°C / -3°C | 0°C / -8°C | 8days (55 mm) Wet | 5h Fair | 73% Muggy | 1.8 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Naperville are June, July, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Naperville, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Naperville is July, with average daytime highs of 28°C (83°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Naperville is January, with average overnight lows of -7°C (20°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Naperville is May, averaging 124mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Naperville runs through May, April, June, July, with the heaviest rainfall in May. Based on 10-year averages for Naperville.
Naperville receives approximately 99 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Naperville.
The least favorable months to visit Naperville are January, February, March, December, primarily due to very cold temperatures. For the best conditions, consider June, July, August, September, October instead.
The annual average UV index in Naperville is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Naperville is 71%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Naperville receives snow. Months with snowfall average 5 snow days and 9 cm (4 in) of accumulation, with about 15 frost days during winter.
Average wind speeds in Naperville are 19 km/h (12 mph). The windiest month is April with peak winds reaching 22 km/h (13 mph) (gusts up to 46 km/h / 28 mph).
Naperville averages 4 clear-sky days per month with overall cloud cover around 60%. The clearest skies occur in September.
The annual average dew point in Naperville is 6°C (43°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Naperville has a Hot-Summer Continental climate, classified as Dfa under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Naperville ranges from 4°C (39°F) to 14°C (57°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Naperville. It earns a climate score of 8.4/10 with Excellent.
For June in Naperville, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 27°C (81°F) and 12 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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