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September Weather in Big Delta, United States

Last updated: June 24, 2025

The average temperature in Big Delta, United States during September is a cool 8°C (46°F). However, temperatures can drop to a chilly -9°C (16°F) or rise to a pleasant 21°C (71°F). Expect precipitation of about 48 mm (1.9 in) over approximately 12 days throughout the month, accompanied by an average humidity level of 90%.

September Temperature in Big Delta

In September in Big Delta, the average temperature is 8°C (46°F). Maximum temperatures can reach 21°C (71°F) and minimums can drop as low as -9°C (16°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates September temperature patterns in Big Delta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Big Delta, September typically has an average temperature of 8°C (46°F), with highs reaching up to 21°C (71°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec-23133249596155463095
Data source: Temperature data for Big 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 Big Delta

In Big Delta in September, the precipitation amount is 48 mm (1.9 in) over a span of 12 days.

September Precipitation Trends in Big Delta

The chart displays monthly precipitation patterns in Big 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 Big Delta, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec12212118451159411148412833
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Big Delta

In Big Delta in September, humidity is 90%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill that clings to your skin, making it essential to dress in layers and stay dry while exploring the sights.

September Average Humidity in Big Delta

This chart illustrates the average monthly humidity levels in Big 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 Big Delta is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec96%93%89%86%79%80%85%88%90%98%100%98%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Big Delta

In Big Delta in September, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Big Delta, you can check the information here.

Maximum UV Index Levels in Big Delta for September

The chart shows the monthly maximum UV Index (UVI) for Big 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 Big Delta typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112455553211
Data source: Big 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 Big Delta Compares to Other Months

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

This table compares monthly weather conditions in Big Delta, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-19°C (-1°F)12 mm (0.5 inches)96%low
February Weather-16°C (3°F)21 mm (0.8 inches)93%low
March Weather-10°C (14°F)21 mm (0.8 inches)89%low
April Weather0°C (33°F)18 mm (0.7 inches)86%moderate
May Weather10°C (49°F)45 mm (1.8 inches)79%moderate
June Weather15°C (59°F)115 mm (4.5 inches)80%moderate
July Weather16°C (62°F)93 mm (3.7 inches)85%moderate
August Weather13°C (55°F)111 mm (4.4 inches)88%moderate
September Weather8°C (46°F)48 mm (1.9 inches)90%moderate
October Weather-1°C (31°F)41 mm (1.6 inches)97%low
November Weather-13°C (10°F)28 mm (1.1 inches)100%low
December Weather-15°C (6°F)33 mm (1.3 inches)98%low

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