Naperville, Illinois Climate
United States
Pop. 147,100 Elev. 217 m / 712 ft
TZ: America/Chicago (UTC-5) ·
Dry and warm, Naperville sees July highs of 86°F (30°C) and cold January lows of 16°F (-9°C). Humidity pushes the summer feels-like temperature to 95°F (35°C), while wind chill can drive winter lows to 7°F (-14°C). Expect around 49 rainy days annually (32.2 in / 817 mm total), with snow on 5 days and 34 in (865 mm) of annual accumulation. The city averages 112 sunny days per year and around 36 thunderstorm days. Ocean water temperatures reach 75°F (24°C) in summer.
| Temperature | 86°F (30°C) high | 16°F (-9°C) low |
| Feels like | 95°F (35°C) high | 7°F (-14°C) low |
| Rain | 49 days | 32.2 in (817 mm) /yr |
| Snow | 5 days | 34.0 in (865 mm) /yr |
| Sky | 112 sunny | 36 stormy |
| Wind | 2.4 mph (1.1 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Apr, Sep, Oct
Sky & Air by Month
Cloud cover (%)
55
Jan 64
Feb 56
Mar 67
Apr 61
May 53
Jun 63
Jul 53
Aug 35
Sep 46
Oct 58
Nov 76
Dec Humidity (%)
60
Jan 66
Feb 59
Mar 60
Apr 64
May 66
Jun 73
Jul 73
Aug 68
Sep 67
Oct 67
Nov 76
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 18 mi Chicago O'Hare International Airport (ORD)
Ski resort 3 mi
National park 28 mi Historic Pullman Foundation Exhibit Hall
Hospital 2 mi Edward Hospital
Hiking trail 1 mi Riverwalk
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 31°F -1°C | 16°F -9°C | 0.9 in 23 mm | 4.4 in111 mm | 14 |
| February | 35°F 2°C | 19°F -7°C | 0.1 in 3 mm | 7.4 in188 mm | 5 |
| March | 57°F 14°C | 36°F 2°C | 3.6 in 90 mm | 4.4 in113 mm | 11 |
| April | 62°F 16°C | 43°F 6°C | 2.7 in 69 mm | 0.1 in3 mm | 4 |
| May | 69°F 20°C | 50°F 10°C | 4.1 in 104 mm | — | 8 |
| June | 84°F 29°C | 64°F 18°C | 4.7 in 119 mm | — | 10 |
| July | 86°F 30°C | 69°F 21°C | 4.8 in 123 mm | — | 7 |
| August | 80°F 27°C | 63°F 17°C | 3.9 in 99 mm | — | 10 |
| September | 78°F 26°C | 56°F 13°C | 1.8 in 45 mm | — | 18 |
| October | 66°F 19°C | 49°F 9°C | 2.6 in 67 mm | — | 13 |
| November | 50°F 10°C | 35°F 2°C | 1.0 in 25 mm | 10.0 in255 mm | 9 |
| December | 35°F 2°C | 20°F -7°C | 2.0 in 51 mm | 7.6 in194 mm | 3 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 1 |
| February | 5 | 0 |
| March | 11 | 4 |
| April | 4 | 1 |
| May | 8 | 3 |
| June | 10 | 6 |
| July | 7 | 7 |
| August | 10 | 6 |
| September | 18 | 5 |
| October | 13 | 2 |
| November | 9 | 0 |
| December | 3 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 37°F 3°C | 32°F 0°C |
| February | 35°F 1°C | 32°F 0°C |
| March | 37°F 3°C | 40°F 4°C |
| April | 44°F 7°C | 49°F 10°C |
| May | 49°F 9°C | 57°F 14°C |
| June | 67°F 20°C | 70°F 21°C |
| July | 75°F 24°C | 78°F 25°C |
| August | 74°F 24°C | 74°F 23°C |
| September | 69°F 21°C | 68°F 20°C |
| October | 67°F 20°C | 59°F 15°C |
| November | 52°F 11°C | 44°F 6°C |
| December | 43°F 6°C | 33°F 1°C |