September weather forecastCave Junction, OR
September
Weather in September
The arrival of September signals the beginning of a transition from hot summer days towards milder autumn weather in Cave Junction. Although the average temperature still holds a high scale, standing at 77.4°F (25.2°C), it exhibits the start of a gradual cooling phase. Noticeably, September marks the end of no snowfall period lasting from May to September. The length of daylight begins to shorten, averaging at 12.5 hours, as nights gradually creep in earlier. Thus, September is a blend of lingering summer warmth and the onset of fall.Temperature
September is characterized by a mild reduction in the average high-temperature, from 84.7°F (29.3°C) in August to a still warm 77.4°F (25.2°C). Cave Junction experiences a significant reduction from daytime highs with an average low-temperature of 45°F (7.2°C) in September.Humidity
The average relative humidity in September is 67%.Rainfall
In Cave Junction, during September, the rain falls for 5.3 days and regularly aggregates up to 0.59" (15mm) of precipitation. In Cave Junction, during the entire year, the rain falls for 135.3 days and collects up to 23.54" (598mm) of precipitation.Snowfall
In Cave Junction, Oregon, snow does not fall in May through October.Daylight
In Cave Junction, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:40 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:11 am and sunset at 6:57 pm PDT.
Sunshine
The average sunshine in September is 10.4h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cave Junction, OR
- Average high temperature in September: 77.4°F
The warmest month (with the highest average high temperature) is August (84.7°F).
The month with the lowest average high temperature is December (46°F).
- Average low temperature in September: 45°F
The month with the highest average low temperature is August (49.1°F).
The coldest month (with the lowest average low temperature) is December (31.5°F).
Average pressure in September
Cave Junction, OR
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in September
Cave Junction, OR
- Average wind speed in September: 3.3mph
The windiest month (with the highest average wind speed) is March (4mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in September
Cave Junction, OR
- Average humidity in September: 67%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (63%).
Average rainfall in September
Cave Junction, OR
- Average rainfall in September: 0.59"
The wettest month (with the highest rainfall) is December (4.02").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days in September
Cave Junction, OR
- Average rainfall days in September: 5.3 days
The month with the highest number of rainy days is March (18.7 days).
The month with the least rainy days is August (2.5 days).
Average snowfall in September
Cave Junction, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Cave Junction, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Cave Junction, OR
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 10h and 24min
The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).
Average sunshine days in September
Cave Junction, OR
- Average sunshine days in September: 23.9 days
The month with the most sunshine days is July (26.7 days).
The month with the least sunshine days is March (10.8 days).
Average UV index in September
Cave Junction, OR
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Cave Junction, OR
- Average cloud cover in September: 23
The month with the most cloud cover is March (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Cave Junction, OR
- Average visibility in September: 5mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
