Last updated: June 24, 2025
In September, the average temperature in Greeley, United States is a pleasant 20°C (68°F). However, be prepared for variations, as temperatures can dip to a minimum of 4°C (39°F) and soar up to a balmy 35°C (95°F). Rainfall is moderate, with 57 mm (2.3 in) expected over approximately 7 days, and the average humidity lingers around a fairly high 77%, creating a unique climate experience.
In September in Greeley, the average temperature is 20°C (68°F). Maximums can reach 35°C (95°F) and minimums can be as low as 4°C (39°F). This weather makes Greeley an ideal destination for travelers looking to enjoy mild days and cooler evenings.
In Greeley in September, the precipitation amount is 57 mm (2.3 in) over a span of 7 days.
In Greeley in September, humidity is 77%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace, making it essential for travelers to stay hydrated and take breaks in shaded areas to avoid feeling sluggish in the heat.
In Greeley 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 Greeley.
UV Risk Categories
Weather in Greeley varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Greeley, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -4°C (25°F) | 24 mm (0.9 inches) | 73% | moderate |
February Weather | -4°C (25°F) | 20 mm (0.8 inches) | 81% | moderate |
March Weather | 4°C (39°F) | 84 mm (3.3 inches) | 69% | high |
April Weather | 9°C (48°F) | 61 mm (2.4 inches) | 71% | very high |
May Weather | 15°C (60°F) | 144 mm (5.7 inches) | 80% | very high |
June Weather | 23°C (74°F) | 89 mm (3.5 inches) | 83% | extreme |
July Weather | 25°C (77°F) | 77 mm (3.0 inches) | 84% | very high |
August Weather | 23°C (73°F) | 91 mm (3.6 inches) | 84% | very high |
September Weather | 20°C (68°F) | 57 mm (2.3 inches) | 77% | very high |
October Weather | 10°C (50°F) | 85 mm (3.3 inches) | 72% | high |
November Weather | 4°C (39°F) | 22 mm (0.9 inches) | 80% | moderate |
December Weather | -1°C (30°F) | 42 mm (1.6 inches) | 79% | moderate |