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!
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.
In Delta Junction in September, the total precipitation amount is 62 mm (2.5 in) spread over the course of 13 days.
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.
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.
UV Risk Categories
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.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
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 Weather | 0°C (33°F) | 24 mm (1.0 inches) | 91% | moderate |
May Weather | 10°C (50°F) | 44 mm (1.7 inches) | 87% | moderate |
June Weather | 15°C (59°F) | 80 mm (3.2 inches) | 86% | moderate |
July Weather | 17°C (62°F) | 84 mm (3.3 inches) | 93% | high |
August Weather | 13°C (56°F) | 127 mm (5.0 inches) | 94% | moderate |
September Weather | 8°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 |