September Weather in Delta, United States

Last updated: June 24, 2025

In Delta, United States, the average temperature in September is a pleasant 21°C (70°F). Expect a minimum of 5°C (42°F) and a maximum of 33°C (92°F). During this month, you'll encounter around 111 mm (4.4 in) of precipitation over 10 days, with humidity levels averaging a comfortable 75%.

September Temperature in Delta

In September in Delta, the average temperature is 21°C (70°F). Maximum temperatures can reach 33°C (92°F), while the minimum can drop as low as 5°C (42°F). This variability makes Delta an ideal destination for travelers looking for a diverse climate experience.

September Weather in Delta: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Delta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Delta, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (42°F).

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

September Precipitation in Delta

In Delta in September, the precipitation amount is 111 mm (4.4 in) over a span of 10 days.

September Precipitation Trends in Delta

The chart displays monthly precipitation patterns in Delta, 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 Delta, September typically receives around 111 mm (4.4 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 Delta

In Delta in September, humidity is 75%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that makes exploring the area feel slightly sticky, requiring travelers to stay hydrated and take occasional breaks in the shade to fully enjoy their adventures.

September Average Humidity in Delta

This chart illustrates the average monthly humidity levels in Delta, 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 Delta 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 Delta

In Delta 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 Delta.

Maximum UV Index Levels in Delta for September

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

Data source: Delta 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 Delta Compares to Other Months

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

This table compares monthly weather conditions in Delta, 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 (35°F)	61 mm (2.4 inches)	84%	moderate
February Weather	3°C (38°F)	97 mm (3.8 inches)	83%	moderate
March Weather	6°C (44°F)	100 mm (3.9 inches)	83%	high
April Weather	12°C (54°F)	100 mm (3.9 inches)	81%	very high
May Weather	18°C (64°F)	140 mm (5.5 inches)	78%	very high
June Weather	23°C (73°F)	108 mm (4.3 inches)	79%	very high
July Weather	26°C (79°F)	150 mm (5.9 inches)	74%	very high
August Weather	24°C (76°F)	144 mm (5.7 inches)	72%	very high
September Weather	21°C (70°F)	111 mm (4.4 inches)	75%	very high
October Weather	16°C (60°F)	101 mm (4.0 inches)	81%	high
November Weather	7°C (46°F)	88 mm (3.5 inches)	85%	moderate
December Weather	4°C (39°F)	98 mm (3.9 inches)	84%	moderate