September Weather in Delta Junction, United States

Last updated: June 24, 2025

In September, the average temperature in Delta Junction, United States hovers around 8°C (46°F). Expect minimum chills of -13°C (8°F), with maximum warmth reaching 21°C (71°F). The weather brings 62 mm (2.5 in) of precipitation over 13 days, contributing to a notable average humidity of 94%. Prepare for a season that’s both cool and damp!

September Temperature in Delta Junction

In September in Delta Junction, the average temperature is 8°C (46°F), with maximums potentially reaching 21°C (71°F) and minimums dropping as low as -13°C (8°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to ensure a comfortable visit.

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

The chart illustrates September temperature patterns in Delta Junction, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Delta Junction, 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 -13°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec-04143349596256463097
Data source: Temperature data for Delta Junction 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 Junction

In Delta Junction in September, the total precipitation amount is 62 mm (2.5 in) spread over the course of 13 days.

September Precipitation Trends in Delta Junction

The chart displays monthly precipitation patterns in Delta Junction, 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 Junction, September typically receives around 62 mm (2.5 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec1420242444808412762483334
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Delta Junction

In Delta Junction in September humidity is 94%. With an average temperature of 8°C (46°F), this humidity feels like a dense blanket wrapping around you, making outdoor activities less enjoyable and causing you to feel damp and cold almost instantly.

September Average Humidity in Delta Junction

This chart illustrates the average monthly humidity levels in Delta Junction, 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 Junction is approximately 94%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec95%93%93%91%87%86%93%94%94%97%99%96%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Delta Junction

In Delta Junction 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 Delta Junction, you can check the information here.

Maximum UV Index Levels in Delta Junction for September

The chart shows the monthly maximum UV Index (UVI) for Delta Junction 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 Junction typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112455653211
Data source: Delta Junction 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 Junction Compares to Other Months

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

This table compares monthly weather conditions in Delta Junction, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-18°C (0°F)14 mm (0.6 inches)95%low
February Weather-16°C (4°F)20 mm (0.8 inches)93%low
March Weather-10°C (14°F)24 mm (0.9 inches)93%low
April Weather0°C (33°F)24 mm (1.0 inches)91%moderate
May Weather10°C (50°F)44 mm (1.7 inches)87%moderate
June Weather15°C (59°F)80 mm (3.2 inches)86%moderate
July Weather17°C (62°F)84 mm (3.3 inches)93%high
August Weather13°C (56°F)127 mm (5.0 inches)94%moderate
September Weather8°C (46°F)62 mm (2.5 inches)94%moderate
October Weather-1°C (30°F)48 mm (1.9 inches)97%low
November Weather-13°C (9°F)33 mm (1.3 inches)99%low
December Weather-14°C (7°F)34 mm (1.3 inches)96%low

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