Last updated: June 24, 2025
In Keystone Heights, United States, the average temperature in September reaches a warm 26°C (80°F). During this time, temperatures can range from a cool 17°C (64°F) to a scorching 36°C (97°F). Visitors should be prepared for some rain, as the area receives an average of 133 mm (5.2 in) of precipitation over 16 days. With an average humidity of 83%, it's essential to stay hydrated and cool.
In September in Keystone Heights, the average temperature is 26°C (80°F). Maximums can reach 36°C (97°F), while minimums can drop as low as 17°C (64°F). This makes Keystone Heights an ideal destination for travelers seeking warm weather and comfortable conditions.
In Keystone Heights in September, the total precipitation amount is 133 mm (5.2 in) spread over 16 days.
In Keystone Heights in September humidity is 83%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket that can make traveling quite uncomfortable; you may find yourself needing frequent breaks for hydration and cool shade as the thick air clings to your skin.
In Keystone Heights in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Keystone Heights.
UV Risk Categories
Weather in Keystone Heights varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Keystone Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 14°C (57°F) | 44 mm (1.7 inches) | 83% | moderate |
| February Weather | 17°C (63°F) | 62 mm (2.5 inches) | 80% | very high |
| March Weather | 18°C (65°F) | 41 mm (1.6 inches) | 75% | very high |
| April Weather | 21°C (70°F) | 81 mm (3.2 inches) | 70% | extreme |
| May Weather | 24°C (76°F) | 103 mm (4.1 inches) | 68% | extreme |
| June Weather | 26°C (80°F) | 163 mm (6.4 inches) | 75% | extreme |
| July Weather | 27°C (81°F) | 190 mm (7.5 inches) | 79% | extreme |
| August Weather | 27°C (81°F) | 177 mm (7.0 inches) | 81% | extreme |
| September Weather | 26°C (80°F) | 133 mm (5.2 inches) | 83% | very high |
| October Weather | 24°C (75°F) | 78 mm (3.1 inches) | 81% | very high |
| November Weather | 18°C (64°F) | 62 mm (2.4 inches) | 82% | high |
| December Weather | 15°C (60°F) | 80 mm (3.1 inches) | 84% | moderate |