Last updated: June 24, 2025
In September, the average temperature in Highland, United States is a pleasant 18°C (65°F), with minimums dipping to 3°C (37°F) and peak maximums soaring to 33°C (92°F). Expect around 119 mm (4.7 in) of rain spread over 10 days, contributing to an average humidity level of 74%.
In September in Highland, the average temperature is 18°C (65°F), with maximums that can reach 33°C (92°F) and minimums that can drop to as low as 3°C (37°F). Overall, travelers should be prepared for a range of temperatures, ensuring they pack both warm clothing for the cooler evenings and lighter attire for the hotter days.
In Highland in September, the total precipitation amount is 119 mm (4.7 in) over the span of 10 days.
In Highland in September humidity is 74%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can make even short walks feel laborious, leading travelers to seek shade and refreshment more often.
In Highland 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 Highland.
UV Risk Categories
Weather in Highland varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Highland, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 45 mm (1.8 inches) | 84% | low |
| February Weather | -5°C (23°F) | 57 mm (2.2 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 59 mm (2.3 inches) | 84% | moderate |
| April Weather | 8°C (47°F) | 85 mm (3.4 inches) | 83% | very high |
| May Weather | 16°C (60°F) | 136 mm (5.4 inches) | 75% | very high |
| June Weather | 22°C (71°F) | 129 mm (5.1 inches) | 79% | very high |
| July Weather | 24°C (75°F) | 103 mm (4.0 inches) | 75% | very high |
| August Weather | 22°C (71°F) | 96 mm (3.8 inches) | 69% | very high |
| September Weather | 18°C (65°F) | 119 mm (4.7 inches) | 74% | very high |
| October Weather | 11°C (51°F) | 124 mm (4.9 inches) | 79% | moderate |
| November Weather | 2°C (37°F) | 46 mm (1.8 inches) | 88% | moderate |
| December Weather | -2°C (29°F) | 41 mm (1.6 inches) | 82% | low |