Last updated: June 24, 2025
In Grantsville, United States, the average temperature in September hovers around 21°C (70°F). However, visitors should be prepared for a range, as it can dip to a chilly 5°C (41°F) or soar to a sweltering 36°C (97°F). Expect about 106 mm (4.2 in) of precipitation over 9 days, contributing to an average humidity of 73%. Whether you're bracing for warmth or cool breezes, pack accordingly!
In September in Grantsville, the average temperature is 21°C (70°F). Maximums can reach 36°C (97°F), and minimums can dip as low as 5°C (41°F). It's a great time to visit for those who enjoy mild weather with the possibility of warm days and cool evenings.
In Grantsville in September, the total precipitation amount is 106 mm (4.2 in), spread over the course of 9 days.
In Grantsville in September, humidity is 73%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace that can make outdoor activities feel sweltering, so it's essential to stay hydrated and take breaks in the shade while exploring.
In Grantsville 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 Grantsville.
UV Risk Categories
Weather in Grantsville varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Grantsville, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 2°C (35°F) | 98 mm (3.9 inches) | 88% | moderate |
February Weather | 4°C (40°F) | 142 mm (5.6 inches) | 88% | moderate |
March Weather | 8°C (46°F) | 115 mm (4.5 inches) | 88% | high |
April Weather | 13°C (55°F) | 142 mm (5.6 inches) | 86% | very high |
May Weather | 18°C (65°F) | 160 mm (6.3 inches) | 82% | very high |
June Weather | 22°C (72°F) | 172 mm (6.8 inches) | 84% | very high |
July Weather | 24°C (76°F) | 129 mm (5.1 inches) | 82% | very high |
August Weather | 23°C (74°F) | 120 mm (4.7 inches) | 73% | very high |
September Weather | 21°C (70°F) | 106 mm (4.2 inches) | 73% | very high |
October Weather | 15°C (60°F) | 116 mm (4.6 inches) | 81% | high |
November Weather | 7°C (45°F) | 81 mm (3.2 inches) | 89% | moderate |
December Weather | 4°C (40°F) | 122 mm (4.8 inches) | 86% | moderate |