May weather forecastWilsonville, OR
May
Weather in May
May ushers in unmistakable signs of impending summer in Wilsonville, Oregon, with an abundance of sunlight and less clouds. This point in the year sees a sharp decrease in precipitation and increase in temperatures. A major decrease in rainfall from 2.83" (72mm) in April to 1.73" (44mm) in May marks the shift in seasons. Visitors and locals will start experiencing more clear days and balmy temperatures characteristic of late spring. May's generally mild climate attracts outdoor activities and peaceful strolls.Temperature
Wilsonville in May experiences a slight uptick in the average high-temperature, adjusting from April's mild 58.1°F (14.5°C) to an enjoyable 66°F (18.9°C). Wilsonville witnesses a consistent, sharp contrast from the daytime highs, with an average low-temperature of 43.2°F (6.2°C) throughout May.Humidity
In Wilsonville, the average relative humidity in May is 75%.Rainfall
In Wilsonville, during May, the rain falls for 14.3 days and regularly aggregates up to 1.73" (44mm) of precipitation. Throughout the year, there are 173.8 rainfall days, and 29.96" (761mm) of precipitation is accumulated.Snowfall
In Wilsonville, snow does not fall in April through October.Daylight
In Wilsonville, the average length of the day in May is 14h and 55min.On the first day of May, sunrise is at 5:58 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 5:26 am and sunset at 8:51 pm PDT.
Sunshine
In May, the average sunshine is 8.8h.UV index
In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index, 4 during May, leads to the following recommendations:
Adopt protective measures - Suggestions to resist sunburn are offered. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Wilsonville, OR
- Average high temperature in May: 66°F
The warmest month (with the highest average high temperature) is August (81°F).
The month with the lowest average high temperature is December (44.2°F).
- Average low temperature in May: 43.2°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).
Average pressure in May
Wilsonville, OR
- Average pressure in May: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in May
Wilsonville, OR
- Average wind speed in May: 4.2mph
The windiest months (with the highest average wind speed) are January and February (5.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity in May
Wilsonville, OR
- Average humidity in May: 75%
The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is August (65%).
Average rainfall in May
Wilsonville, OR
- Average rainfall in May: 1.73"
The wettest month (with the highest rainfall) is December (4.49").
The driest months (with the least rainfall) are July and August (0.31").
Average rainfall days in May
Wilsonville, OR
- Average rainfall days in May: 14.3 days
The month with the highest number of rainy days is March (20.9 days).
The months with the least rainy days are July and August (4.4 days).
Average snowfall in May
Wilsonville, OR
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.26").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in May
Wilsonville, 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
Wilsonville, OR
- Average daylight in May: 14h and 54min
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 May: 8h and 48min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in May
Wilsonville, OR
- Average sunshine days in May: 15.6 days
The month with the most sunshine days is July (25 days).
The month with the least sunshine days is March (8.3 days).
Average UV index in May
Wilsonville, 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
Wilsonville, OR
- Average cloud cover in May: 46
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility in May
Wilsonville, OR
- Average visibility in May: 5mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).
