September weather forecastVernonia, OR
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Vernonia, Oregon, with an average temperature fluctuating between 47.7°F (8.7°C) and 70.3°F (21.3°C).Temperature
Vernonia's transition into September involves a gentle shift in temperature, receding from a moderately hot 77°F (25°C) in August to a pleasant 70.3°F (21.3°C). A sharp contrast between day and night is prevalent in September with an average nighttime temperature of 47.7°F (8.7°C).Humidity
In Vernonia, Oregon, the average relative humidity in September is 79%.Rainfall
In Vernonia, during September, the rain falls for 12.2 days and regularly aggregates up to 1.81" (46mm) of precipitation. In Vernonia, during the entire year, the rain falls for 184.4 days and collects up to 36.61" (930mm) of precipitation.Snowfall
In Vernonia, snow does not fall in May through October.Daylight
In September, the average length of the day in Vernonia is 12h and 31min.On the first day of September, sunrise is at 6:34 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:54 pm PDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 3 suggests this advice:
Undertake precautions - Guarding against sun damage is counselled. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Vernonia, OR
- Average high temperature in September: 70.3°F
The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is December (42.1°F).
- Average low temperature in September: 47.7°F
The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is December (32.9°F).
Average pressure in September
Vernonia, OR
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.02"Hg).
Average wind speed in September
Vernonia, OR
- Average wind speed in September: 3.9mph
The windiest months (with the highest average wind speed) are January, March and November (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).
Average humidity in September
Vernonia, OR
- Average humidity in September: 79%
The month with the highest relative humidity is November (89%).
The month with the lowest relative humidity is July (73%).
Average rainfall in September
Vernonia, OR
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is January (5.79").
The driest months (with the least rainfall) are July and August (0.51").
Average rainfall days in September
Vernonia, OR
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is March (21.7 days).
The month with the least rainy days is July (6 days).
Average snowfall in September
Vernonia, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Vernonia, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.4 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
Vernonia, OR
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 18min).
Average sunshine days in September
Vernonia, OR
- Average sunshine days in September: 15.6 days
The month with the most sunshine days is July (22.1 days).
The months with the least sunshine days are February and March (7.6 days).
Average UV index in September
Vernonia, OR
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Vernonia, OR
- Average cloud cover in September: 43
The months with the most cloud cover are February and March (Cloud cover 67).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Vernonia, OR
- Average visibility in September: 4mi
The months with the highest visibility are July and August (5mi).
The months with the lowest visibility are January, February, March, April, May, June, September, October, November and December (4mi).
