September Weather in South Greeley, United States

Last updated: June 24, 2025

In September, the average temperature in South Greeley, United States hovers around 18°C (64°F). Expect a wide temperature range with minimums dipping to -2°C (28°F) and highs soaring up to 36°C (97°F). Precipitation levels are generally low, averaging just 18 mm (0.7 in) over 3 days, while the average humidity sits comfortably at 75%.

September Temperature in South Greeley

In September in South Greeley, the average temperature is 18°C (64°F). The maximum can reach 36°C (97°F), while the minimum can drop as low as -2°C (28°F). This wide temperature range makes it essential for travelers to pack accordingly to enjoy their visit comfortably.

September Weather in South Greeley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Greeley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Greeley, September typically has an average temperature of 18°C (64°F), with highs reaching up to 36°C (97°F) and lows dropping to around -2°C (28°F).

Data source: Temperature data for South Greeley generated using information from the Copernicus Climate Change Service.

September Precipitation in South Greeley

In South Greeley in September, the precipitation amount is 18 mm (0.7 in) over a span of 3 days.

September Precipitation Trends in South Greeley

The chart displays monthly precipitation patterns in South Greeley, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In South Greeley, September typically receives around 18 mm (0.7 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in South Greeley

In South Greeley in September, humidity is 75%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket enveloping you, making your travels a bit sticky and requiring frequent breaks in the shade to stay comfortable.

September Average Humidity in South Greeley

This chart illustrates the average monthly humidity levels in South Greeley, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in South Greeley is approximately 75%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Greeley

In South Greeley in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in South Greeley.

Maximum UV Index Levels in South Greeley for September

The chart shows the monthly maximum UV Index (UVI) for South Greeley in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in South Greeley typically reaches 9, which falls under the very high exposure category.

Data source: South Greeley September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in South Greeley Compares to Other Months

Weather in South Greeley varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in South Greeley, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in South Greeley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	13 mm (0.5 inches)	72%	moderate
February Weather	-2°C (28°F)	19 mm (0.7 inches)	76%	high
March Weather	3°C (38°F)	51 mm (2.0 inches)	61%	high
April Weather	7°C (45°F)	46 mm (1.8 inches)	60%	very high
May Weather	12°C (54°F)	103 mm (4.1 inches)	74%	very high
June Weather	19°C (67°F)	44 mm (1.7 inches)	82%	extreme
July Weather	23°C (73°F)	34 mm (1.3 inches)	82%	extreme
August Weather	21°C (71°F)	32 mm (1.3 inches)	84%	extreme
September Weather	18°C (64°F)	18 mm (0.7 inches)	75%	very high
October Weather	8°C (47°F)	33 mm (1.3 inches)	73%	high
November Weather	4°C (40°F)	22 mm (0.9 inches)	74%	moderate
December Weather	1°C (33°F)	15 mm (0.6 inches)	77%	moderate