Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The arrival of September suggests a slight decrease in the average high-temperature, moving from a warm 26.5°C (79.7°F) in August to an agreeable 22.5°C (72.5°F). Troutdale receives a consistent average low-temperature of 9.7°C (49.5°F) in September, a substantial dip from the day's heat.Humidity
The average relative humidity in September is 70%.Rainfall
In Troutdale, in September, it is raining for 10.1 days, with typically 48mm (1.89") of accumulated precipitation. In Troutdale, during the entire year, the rain falls for 171 days and collects up to 945mm (37.2") of precipitation.Snowfall
In Troutdale, snow does not fall in April through October.Daylight
In Troutdale, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:31 am and sunset at 7:46 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:50 pm PDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In September, an average UV index of 4 transforms into the following instructions:
Ensure safety - Sun damage prevention is strongly urged. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September in Troutdale?
When it does not snow?
How many hours of daylight does Troutdale have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Troutdale, OR
- Average high temperature in September: 22.5°C
The warmest month (with the highest average high temperature) is August (26.5°C).
The month with the lowest average high temperature is December (6.3°C).
- Average low temperature in September: 9.7°C
The month with the highest average low temperature is August (11.5°C).
The coldest month (with the lowest average low temperature) is December (0.7°C).
Average pressure in September
Troutdale, OR
- Average pressure in September: 1016.1mbar
The month with the highest atmospheric pressure is January (1020.1mbar).
The month with the lowest atmospheric pressure is August (1015.8mbar).
Average wind speed in September
Troutdale, OR
- Average wind speed in September: 6.3km/h
The windiest month (with the highest average wind speed) is January (10.9km/h).
The calmest month (with the lowest average wind speed) is August (5.6km/h).
Average humidity in September
Troutdale, OR
- Average humidity in September: 70%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (65%).
Average rainfall in September
Troutdale, OR
- Average rainfall in September: 48mm
The wettest month (with the highest rainfall) is December (143mm).
The driest month (with the least rainfall) is July (8mm).
Average rainfall days in September
Troutdale, OR
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is March (19.6 days).
The month with the least rainy days is August (4.1 days).
Average snowfall in September
Troutdale, OR
- Average snowfall in September: 0mm
The month with the highest snowfall is February (39mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Troutdale, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Troutdale, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days in September
Troutdale, OR
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is August (25.3 days).
The month with the least sunshine days is February (8.6 days).
Average UV index in September
Troutdale, 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
Troutdale, OR
- Average cloud cover in September: 33
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in September
Troutdale, OR
- Average visibility in September: 9km
The months with the highest visibility are July, August and September (9km).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (8km).
Troutdale, Oregon, USA
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