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
The shift from April to May introduces a subtle increase in the average high-temperature, moving from a cool 54.3°F (12.4°C) to a refreshing 62.8°F (17.1°C). Throughout May, Saint Helens braces for a considerable drop from daytime highs, with an average low-temperature of 39.9°F (4.4°C).Humidity
In May, the average relative humidity is 79%.Rainfall
In Saint Helens, in May, it is raining for 12.8 days, with typically 1.26" (32mm) of accumulated precipitation. Throughout the year, in Saint Helens, there are 149 rainfall days, and 19.37" (492mm) of precipitation is accumulated.Snowfall
In Saint Helens, Oregon, snow does not fall in May through October.Daylight
In May, the average length of the day in Saint Helens is 14h and 58min.On the first day of the month, sunrise is at 5:56 am and sunset at 8:19 pm. On the last day of May, sunrise is at 5:24 am and sunset at 8:53 pm PDT.
Sunshine
In May, the average sunshine in Saint Helens, Oregon, is 7.8h.UV index
In Saint Helens, Oregon, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: In May, the maximum UV index of 4 translates into these guidelines:
Adopt protective measures - Suggestions to resist sunburn are offered. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Frequently asked questions
What is the usual temperature for Saint Helens in May?
What is the average humidity in May in Saint Helens?
How much does it rain in Saint Helens in May?
When it does not snow in Saint Helens?
Does it snow in Saint Helens in May?
How many hours of daylight does Saint Helens have in May?
When are sunrise and sunset in May in Saint Helens?
How many hours of sunshine does Saint Helens have in May?
What is the UV index reading in May in Saint Helens?
Average temperature in May
Saint Helens, OR
- Average high temperature in May: 62.8°F
The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (41.9°F).
- Average low temperature in May: 39.9°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (31.8°F).
Average pressure in May
Saint Helens, 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
Saint Helens, OR
- Average wind speed in May: 3.9mph
The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in May
Saint Helens, OR
- Average humidity in May: 79%
The month with the highest relative humidity is February (88%).
The months with the lowest relative humidity are July and August (72%).
Average rainfall in May
Saint Helens, OR
- Average rainfall in May: 1.26"
The wettest month (with the highest rainfall) is January (2.64").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in May
Saint Helens, OR
- Average rainfall days in May: 12.8 days
The month with the highest number of rainy days is March (16 days).
The month with the least rainy days is July (5.9 days).
Average snowfall in May
Saint Helens, OR
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.97").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Saint Helens, OR
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (3.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in May /
Average sunshine in May
Saint Helens, 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: 7h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 42min).
Average sunshine days in May
Saint Helens, OR
- Average sunshine days in May: 16.8 days
The month with the most sunshine days is July (23.7 days).
The month with the least sunshine days is February (12.1 days).
Average UV index in May
Saint Helens, OR
- Average UV index in May: 4
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in May
Saint Helens, OR
- Average cloud cover in May: 53
The month with the most cloud cover is March (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in May
Saint Helens, OR
- Average visibility in May: 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).
Saint Helens, Oregon, USA
Weather forecast for your location
2. Allow the app to use your location
