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September Weather in Delta, United States

Last updated: June 24, 2025

In Delta, United States, the average temperature in September hovers around 20°C (68°F). Expect a range where the temperature can dip to a chilly 4°C (39°F) and rise to a warm 34°C (93°F). During this month, you might encounter about 58 mm (2.3 in) of precipitation over 8 days, with an average humidity level of 78%—perfect for enjoying the lush greenery that comes with the season!

September Temperature in Delta

In September in Delta, the average temperature is 20°C (68°F). The maximum can reach 34°C (93°F), while the minimum can be as low as 4°C (39°F). Overall, this month offers a pleasant variety of temperatures, making it an excellent time for travelers to explore the region.

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 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec283039496271757368564134
Data source: Temperature data for Delta generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Delta

In Delta in September, the precipitation amount is 58 mm (2.3 in) over a span of 8 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 58 mm (2.3 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec707286951441071098958928256
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Delta

In Delta in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)70 mm (2.8 inches)88%moderate
February Weather-1°C (30°F)72 mm (2.8 inches)87%moderate
March Weather4°C (40°F)86 mm (3.4 inches)87%high
April Weather9°C (49°F)95 mm (3.7 inches)87%very high
May Weather16°C (62°F)144 mm (5.7 inches)81%very high
June Weather22°C (72°F)107 mm (4.2 inches)82%very high
July Weather24°C (76°F)109 mm (4.3 inches)81%very high
August Weather23°C (73°F)89 mm (3.5 inches)78%very high
September Weather20°C (68°F)58 mm (2.3 inches)78%very high
October Weather13°C (56°F)92 mm (3.6 inches)82%high
November Weather5°C (41°F)82 mm (3.2 inches)89%moderate
December Weather1°C (34°F)56 mm (2.2 inches)86%low

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