Arlington Heights weather by month
Average highs run from 32°F in January to 84°F in July, and January nights average 19°F. It gets 38 inches of rain and melted snow a year and 38 inches of snow. Nights drop below freezing about 121 times a year. The most comfortable months are May to October.
Best time to visit Arlington Heights
For comfortable weather, go in May to October. In those months the average high stays between 62°F and 86°F, nights average 42°F or warmer, and rain stays under 4.5 inches for the month.
Month by month
| Month | High | Low | Precip. | Snow | Wet days | Days 90°F+ | Nights below 32°F | Feels |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 19°F | 2.0 in | 11.3 in | 5 | 0 | 28 | very cold |
| February | 36°F | 22°F | 2.0 in | 10.7 in | 5 | 0 | 24 | cold |
| March | 47°F | 31°F | 2.5 in | 5.5 in | 6 | 0 | 20 | cold |
| April | 59°F | 40°F | 3.8 in | 1.3 in | 7 | 0 | 6 | cool |
| May | 71°F | 51°F | 4.5 in | 0.0 in | 8 | 1 | 0 | mild |
| June | 80°F | 61°F | 4.1 in | 0.0 in | 7 | 4 | 0 | warm |
| July | 85°F | 66°F | 3.7 in | 0.0 in | 6 | 7 | 0 | warm |
| August | 83°F | 65°F | 4.3 in | 0.0 in | 7 | 4 | 0 | warm |
| September | 76°F | 57°F | 3.2 in | 0.0 in | 6 | 2 | 0 | mild |
| October | 63°F | 45°F | 3.4 in | 0.2 in | 6 | 0 | 3 | mild |
| November | 48°F | 34°F | 2.4 in | 1.8 in | 5 | 0 | 15 | cool |
| December | 37°F | 24°F | 2.1 in | 7.6 in | 5 | 0 | 25 | cold |
| Year | 60°F avg | 43°F avg | 37.9 in | 38.4 in | 72 | 17 | 121 |
"Wet days" are days with at least 0.1 inch of precipitation. "Feels" is a plain-language label for the average high. Normals for 1991-2020 from NOAA NCEI, station Chicago Ohare Intl. Airport, IL (USW00094846), 6.9 miles from the city center. Averages describe typical conditions, not a forecast.
Sunrise, sunset and daylight in Arlington Heights
The shortest day is December 21, with 9h 06m of daylight; the longest is June 21, with 15h 15m. The earliest sunset comes around December 5 (4:19 pm) and the latest around June 21 (8:31 pm). The sun sets after 8 pm on 92 days a year.
| On the 15th of | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:17 am | 4:45 pm | 9h 27m |
| February | 6:48 am | 5:24 pm | 10h 37m |
| March | 7:03 am | 6:58 pm | 11h 54m |
| April | 6:11 am | 7:33 pm | 13h 22m |
| May | 5:31 am | 8:05 pm | 14h 34m |
| June | 5:15 am | 8:29 pm | 15h 14m |
| July | 5:29 am | 8:25 pm | 14h 56m |
| August | 6:00 am | 7:52 pm | 13h 52m |
| September | 6:32 am | 7:01 pm | 12h 29m |
| October | 7:04 am | 6:09 pm | 11h 05m |
| November | 6:42 am | 4:30 pm | 9h 48m |
| December | 7:13 am | 4:20 pm | 9h 07m |
Calculated for 2026 at the center of Arlington Heights with NOAA's solar equations, in local clock time (Central Time, including daylight saving time where it applies). Times shift by a minute or two from year to year.
Is Arlington Heights getting warmer?
The last 10 years averaged 2.7°F warmer than the 20th century. See the climate stripes for Arlington Heights.Frequently asked questions
What is the warmest month in Arlington Heights?
July is the warmest month, with an average high of 85°F and an average low of 66°F (NOAA 1991-2020 normals).
What is the coldest month in Arlington Heights?
January is the coldest, with average lows of 19°F and highs of 32°F.
What is the rainiest month in Arlington Heights?
May gets the most precipitation, 4.5 inches on average. February is the driest at 2.0 inches.
Does it snow in Arlington Heights?
Yes. Arlington Heights averages 38 inches of snow a year.
When is the best time to visit Arlington Heights?
For comfortable weather, May to October. Those months average highs between 62 and 86°F with lows of 42°F or more and modest rain.
Thinking of moving to Arlington Heights?
See what homes, rent and everyday prices cost, who lives there and how it compares with nearby cities on the full Arlington Heights profile.
Compare the weather: Arlington Heights vs Schaumburg, Arlington Heights vs Evanston, Arlington Heights vs Elgin, Arlington Heights vs Waukegan.