Last updated: June 24, 2025
In Arlington Heights, United States, the average temperature in September hovers around 14°C (58°F). However, be prepared for temperature fluctuations; it can dip as low as 3°C (37°F) and soar to a maximum of 32°C (90°F). Expect 175 mm (6.9 in) of precipitation over approximately 12 days, contributing to an average humidity level of 76%. Enjoy the diverse climate while exploring this vibrant destination!
In September in Arlington Heights, the average temperature is 14°C (58°F). Maximum temperatures can reach up to 32°C (90°F), while minimum temperatures can drop as low as 3°C (37°F). Whether you're planning outdoor adventures or city explorations, be sure to pack for a range of temperatures to fully enjoy your trip.
In Arlington Heights in September, the precipitation amount is 175 mm (6.9 in) accumulated over the course of 12 days.
In Arlington Heights in September humidity is 76%. With an average temperature of 14°C (58°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel sticky and draining, and prompting travelers to seek shade and stay hydrated often.
In Arlington Heights in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Arlington Heights.
UV Risk Categories
Weather in Arlington Heights varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Arlington Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (37°F) | 314 mm (12.4 inches) | 87% | low |
| February Weather | 2°C (36°F) | 325 mm (12.8 inches) | 86% | moderate |
| March Weather | 5°C (41°F) | 256 mm (10.1 inches) | 88% | moderate |
| April Weather | 8°C (47°F) | 214 mm (8.4 inches) | 86% | high |
| May Weather | 12°C (54°F) | 113 mm (4.4 inches) | 82% | very high |
| June Weather | 15°C (59°F) | 104 mm (4.1 inches) | 82% | very high |
| July Weather | 17°C (63°F) | 37 mm (1.5 inches) | 85% | very high |
| August Weather | 18°C (64°F) | 38 mm (1.5 inches) | 77% | very high |
| September Weather | 14°C (58°F) | 175 mm (6.9 inches) | 76% | high |
| October Weather | 8°C (47°F) | 302 mm (11.9 inches) | 88% | moderate |
| November Weather | 5°C (42°F) | 404 mm (15.9 inches) | 88% | moderate |
| December Weather | 2°C (37°F) | 365 mm (14.4 inches) | 89% | low |