Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
May's arrival is marked by an increase in the average high-temperature, moving from a moderate 56.8°F (13.8°C) in April to a still refreshing 65.8°F (18.8°C). May nights showcase a dramatic shift from daytime highs to an average temperature of 42.6°F (5.9°C).Humidity
In Scappoose, the average relative humidity in May is 76%.Rainfall
In Scappoose, during May, the rain falls for 14.3 days and regularly aggregates up to 2.09" (53mm) of precipitation. Throughout the year, there are 181.3 rainfall days, and 35.55" (903mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In May, the average length of the day is 14h and 58min.On the first day of May, sunrise is at 5:57 am and sunset at 8:19 pm. On the last day of the month, sunrise is at 5:25 am and sunset at 8:53 pm PDT.
Sunshine
In May, the average sunshine is 8.4h.UV index
The average daily maximum UV index in May in Scappoose is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 4 in May converts into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. 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
What are the temperatures in May?
What is the average humidity in May?
How much does it rain in May?
When it does not snow?
What is the average length of the day in May?
When is the sunrise / sunset in May?
How long on average sun shines in May?
What is the UV index reading in May?
Average temperature in May
Scappoose, OR
- Average high temperature in May: 65.8°F
The warmest month (with the highest average high temperature) is August (79.7°F).
The month with the lowest average high temperature is December (42.8°F).
- Average low temperature in May: 42.6°F
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).
Average pressure in May
Scappoose, OR
- Average pressure in May: 30.03"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in May
Scappoose, OR
- Average wind speed in May: 4.2mph
The windiest month (with the highest average wind speed) is March (4.8mph).
The calmest month (with the lowest average wind speed) is September (4mph).
Average humidity in May
Scappoose, OR
- Average humidity in May: 76%
The months with the highest relative humidity are February and November (87%).
The months with the lowest relative humidity are July and August (69%).
Average rainfall in May
Scappoose, OR
- Average rainfall in May: 2.09"
The wettest month (with the highest rainfall) is January (5.24").
The driest month (with the least rainfall) is August (0.43").
Average rainfall days in May
Scappoose, OR
- Average rainfall days in May: 14.3 days
The month with the highest number of rainy days is March (21.1 days).
The months with the least rainy days are July and August (5.5 days).
Average snowfall in May
Scappoose, OR
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Scappoose, OR
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Scappoose, OR
- Average daylight in May: 15h and 0min
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 May: 8h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).
Average sunshine days in May
Scappoose, OR
- Average sunshine days in May: 15.3 days
The month with the most sunshine days is July (23.2 days).
The month with the least sunshine days is February (7.8 days).
Average UV index in May
Scappoose, OR
- Average UV index in May: 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 May
Scappoose, OR
- Average cloud cover in May: 49
The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in May
Scappoose, OR
- Average visibility in May: 5mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
Scappoose, Oregon, USA
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