Last updated: June 24, 2025
In January, the average temperature in Arlington Heights, United States hovers around -1°C (30°F). While it can dip to a chilly -20°C (-4°F), temperatures can also reach a maximum of 17°C (62°F). Expect 76 mm (3.0 in) of precipitation over 9 days, accompanied by a relatively high average humidity of 87%.
In January in Arlington Heights, the average temperature is -1°C (30°F). Maximums can reach 17°C (62°F), while minimums can drop as low as -20°C (-4°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Arlington Heights in January, the precipitation amount is 76 mm (3.0 in) spread over a period of 9 days.
In Arlington Heights in January, humidity is 87%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that penetrates through layers of clothing, making travel uncomfortable as the dampness clings to your skin, intensifying the cold and causing every gust of wind to feel even more frigid.
In Arlington Heights in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Arlington Heights, you can check the information here.
UV Risk Categories
Weather in Arlington Heights varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Arlington Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 76 mm (3.0 inches) | 87% | moderate |
| February Weather | 0°C (33°F) | 109 mm (4.3 inches) | 85% | moderate |
| March Weather | 3°C (39°F) | 97 mm (3.8 inches) | 85% | high |
| April Weather | 10°C (49°F) | 120 mm (4.7 inches) | 83% | very high |
| May Weather | 15°C (60°F) | 144 mm (5.7 inches) | 75% | very high |
| June Weather | 20°C (69°F) | 106 mm (4.2 inches) | 73% | very high |
| July Weather | 24°C (75°F) | 139 mm (5.5 inches) | 65% | very high |
| August Weather | 22°C (72°F) | 146 mm (5.7 inches) | 62% | very high |
| September Weather | 19°C (66°F) | 120 mm (4.7 inches) | 66% | very high |
| October Weather | 13°C (56°F) | 143 mm (5.6 inches) | 79% | high |
| November Weather | 5°C (42°F) | 95 mm (3.7 inches) | 87% | moderate |
| December Weather | 1°C (34°F) | 112 mm (4.4 inches) | 85% | low |