September Weather in Delta, United States

Last updated: June 24, 2025

In September, the average temperature in Delta, United States hovers around 19°C (66°F), with a minimum chill of -1°C (31°F) and a delightful maximum of 36°C (96°F). Expect some precipitation, totaling about 20 mm (0.8 in) over 3 days, and enjoy a comfortable average humidity of 53%.

September Temperature in Delta

In September in Delta, the average temperature is 19°C (66°F). The maximum can reach 36°C (96°F), and the minimum can be as low as -1°C (31°F). It's important to pack for a range of temperatures if you're planning a trip during this month.

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 19°C (66°F), with highs reaching up to 36°C (96°F) and lows dropping to around -1°C (31°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 20 mm (0.8 in) accumulated over a period of 3 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 20 mm (0.8 inches) of precipitation spread over approximately 3 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 53%. With an average temperature of 19°C (66°F), this humidity feels like a refreshing breeze that enhances the pleasant warmth, making it ideal for exploring the sights and enjoying outdoor activities without feeling overly sticky or uncomfortable.

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 53%, 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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check 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 10, 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	-4°C (25°F)	31 mm (1.2 inches)	90%	moderate
February Weather	-1°C (30°F)	42 mm (1.7 inches)	89%	high
March Weather	4°C (40°F)	47 mm (1.8 inches)	81%	very high
April Weather	10°C (50°F)	26 mm (1.0 inches)	74%	very high
May Weather	15°C (60°F)	26 mm (1.0 inches)	58%	extreme
June Weather	22°C (71°F)	11 mm (0.4 inches)	47%	extreme
July Weather	25°C (77°F)	13 mm (0.5 inches)	39%	extreme
August Weather	23°C (74°F)	10 mm (0.4 inches)	39%	extreme
September Weather	19°C (66°F)	20 mm (0.8 inches)	53%	very high
October Weather	9°C (49°F)	36 mm (1.4 inches)	72%	high
November Weather	4°C (39°F)	21 mm (0.8 inches)	84%	moderate
December Weather	-3°C (28°F)	31 mm (1.2 inches)	90%	moderate