September Weather in Green Valley, United States

Last updated: June 24, 2025

In Green Valley, United States, the average temperature in September is a pleasant 21°C (71°F). However, you can expect a range with minimums dropping to 5°C (41°F) and maximums soaring to 35°C (94°F). Rainfall is moderate, averaging 105 mm (4.2 in) over about 10 days, while the air holds a 75% average humidity, ensuring a distinctly tropical feel.

September Temperature in Green Valley

In September in Green Valley, the average temperature is 21°C (71°F). Maximum temperatures can reach 35°C (94°F), while the minimum can drop to as low as 5°C (41°F). This diverse temperature range makes Green Valley an ideal destination for travelers seeking both warmth and cooler breezy evenings.

September Weather in Green Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Green Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Green Valley, September typically has an average temperature of 21°C (71°F), with highs reaching up to 35°C (94°F) and lows dropping to around 5°C (41°F).

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

September Precipitation in Green Valley

In Green Valley in September, the precipitation amount is 105 mm (4.2 in) over a span of 10 days.

September Precipitation Trends in Green Valley

The chart displays monthly precipitation patterns in Green Valley, 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 Green Valley, September typically receives around 105 mm (4.2 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Green Valley

In Green Valley in September, humidity is 75%. With an average temperature of 21°C (71°F), this humidity feels like a warm blanket wrapping around you, making travel slightly uncomfortable but offering a lush, vibrant atmosphere that invites exploration at a leisurely pace.

September Average Humidity in Green Valley

This chart illustrates the average monthly humidity levels in Green Valley, 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 Green Valley 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 Green Valley

In Green Valley 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 Green Valley.

Maximum UV Index Levels in Green Valley for September

The chart shows the monthly maximum UV Index (UVI) for Green Valley 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 Green Valley typically reaches 8, which falls under the very high exposure category.

Data source: Green Valley 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 Green Valley Compares to Other Months

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

This table compares monthly weather conditions in Green Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	59 mm (2.3 inches)	84%	moderate
February Weather	4°C (40°F)	96 mm (3.8 inches)	83%	moderate
March Weather	7°C (45°F)	89 mm (3.5 inches)	83%	high
April Weather	13°C (56°F)	96 mm (3.8 inches)	81%	very high
May Weather	18°C (65°F)	138 mm (5.4 inches)	78%	very high
June Weather	23°C (74°F)	129 mm (5.1 inches)	79%	very high
July Weather	26°C (80°F)	154 mm (6.1 inches)	74%	very high
August Weather	25°C (77°F)	134 mm (5.3 inches)	72%	very high
September Weather	21°C (71°F)	105 mm (4.2 inches)	75%	very high
October Weather	16°C (61°F)	104 mm (4.1 inches)	81%	high
November Weather	8°C (46°F)	88 mm (3.5 inches)	85%	moderate
December Weather	4°C (40°F)	95 mm (3.7 inches)	84%	moderate