Last updated: June 24, 2025
In September, the average temperature in Arlington Heights, United States hovers around 20°C (68°F). You can expect variations with a minimum of 3°C (38°F) and a maximum of 33°C (93°F). During this time, precipitation totals approximately 85 mm (3.3 in) over 9 days, contributing to an average humidity level of 80%.
In September in Arlington Heights, the average temperature is 20°C (68°F). Maximum temperatures can reach 33°C (93°F), while the minimum can drop to as low as 3°C (38°F). This variation makes Arlington Heights an ideal destination for travelers seeking diverse weather experiences.
In Arlington Heights in September, the precipitation amount is 85 mm (3.3 in) over the course of 9 days.
In Arlington Heights in September, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.
In Arlington Heights in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 | -4°C (26°F) | 61 mm (2.4 inches) | 82% | moderate |
| February Weather | -2°C (28°F) | 60 mm (2.4 inches) | 83% | moderate |
| March Weather | 4°C (39°F) | 79 mm (3.1 inches) | 84% | high |
| April Weather | 9°C (48°F) | 115 mm (4.5 inches) | 85% | very high |
| May Weather | 15°C (60°F) | 164 mm (6.4 inches) | 79% | very high |
| June Weather | 21°C (71°F) | 134 mm (5.3 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 105 mm (4.1 inches) | 80% | very high |
| August Weather | 23°C (73°F) | 92 mm (3.6 inches) | 81% | very high |
| September Weather | 20°C (68°F) | 85 mm (3.3 inches) | 80% | very high |
| October Weather | 12°C (54°F) | 127 mm (5.0 inches) | 82% | high |
| November Weather | 4°C (39°F) | 55 mm (2.2 inches) | 88% | moderate |
| December Weather | 0°C (33°F) | 53 mm (2.1 inches) | 84% | low |