Last updated: June 24, 2025
In Gratis, United States, the average temperature in September hovers around 21°C (69°F), with extremes ranging from a chilly 5°C (42°F) to a warm 34°C (93°F). Expect 88 mm (3.5 in) of precipitation spread over approximately 8 days, contributing to an average humidity level of 73%. Enjoy the pleasant weather while staying prepared for the occasional shower!
In September in Gratis, the average temperature is 21°C (69°F). Maximums can reach 34°C (93°F), and minimums can be as low as 5°C (42°F). This makes Gratis an ideal destination for travelers looking for mild weather with the possibility of warmer or cooler days.
In Gratis in September, the precipitation amount is 88 mm (3.5 in) over the course of 8 days.
In Gratis in September, humidity is 73%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat stifling and travel a bit more challenging, as the air is dense and can leave you feeling fatigued more quickly.
In Gratis 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 Gratis.
UV Risk Categories
Weather in Gratis varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Gratis, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 77 mm (3.0 inches) | 88% | moderate |
| February Weather | 1°C (34°F) | 103 mm (4.1 inches) | 88% | moderate |
| March Weather | 6°C (43°F) | 122 mm (4.8 inches) | 87% | high |
| April Weather | 11°C (52°F) | 103 mm (4.0 inches) | 85% | very high |
| May Weather | 18°C (64°F) | 137 mm (5.4 inches) | 81% | very high |
| June Weather | 22°C (72°F) | 140 mm (5.5 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 111 mm (4.4 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 96 mm (3.8 inches) | 73% | very high |
| September Weather | 21°C (69°F) | 88 mm (3.5 inches) | 73% | very high |
| October Weather | 14°C (58°F) | 102 mm (4.0 inches) | 78% | high |
| November Weather | 5°C (42°F) | 98 mm (3.8 inches) | 89% | moderate |
| December Weather | 2°C (37°F) | 96 mm (3.8 inches) | 87% | moderate |