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 onset of May marks an increase in the average high-temperature, moving from a mild 55.9°F (13.3°C) in April to a comfortable 65.7°F (18.7°C). The low-temperature averages to a frosty 44.2°F (6.8°C) during the nights of May.Humidity
The average relative humidity in May in Saint John is 61%.Rainfall
The wettest months in Saint John, Washington, are January and May, with an average 0.91" (23mm) of rainfall.Snowfall
Months with snowfall are January through May, September, November and December. May is the last month it regularly snows. During 0.2 snowfall days, in May, Saint John aggregates 0.08" (2mm) of snow. Throughout the year, in Saint John, Washington, there are 32.5 snowfall days, and 14.09" (358mm) of snow is accumulated.Daylight
The average length of the day in May is 15h and 6min.On the first day of May in Saint John, sunrise is at 5:32 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 4:58 am and sunset at 8:37 pm PDT.
Sunshine
In May, the average sunshine is 10.6h.UV index
The average daily maximum UV index in May in Saint John is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The maximum daily UV index of 4 in May interprets into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Frequently asked questions
What are the temperatures in Saint John in May?
What is the average humidity in May in Saint John?
What is the wettest month in Saint John?
How much does it rain in Saint John in May?
What is the last month it snows in Saint John?
What is the average length of the day in May in Saint John?
When are sunrise and sunset in May in Saint John?
How many hours of sunshine does Saint John have in May?
How high is the UV index in May in Saint John?
Average temperature in May
Saint John, WA
- Average high temperature in May: 65.7°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is December (33.1°F).
- Average low temperature in May: 44.2°F
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).
Average pressure in May
Saint John, WA
- Average pressure in May: 29.94"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed in May
Saint John, WA
- Average wind speed in May: 7.5mph
The windiest month (with the highest average wind speed) is March (8.8mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in May
Saint John, WA
- Average humidity in May: 61%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (36%).
Average rainfall in May
Saint John, WA
- Average rainfall in May: 0.91"
The wettest months (with the highest rainfall) are January and May (0.91").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in May
Saint John, WA
- Average rainfall days in May: 8.6 days
The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is July (3.5 days).
Average snowfall in May
Saint John, WA
- Average snowfall in May: 0.08"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and October (0").
Average snowfall days in May
Saint John, WA
- Average snowfall days in May: 0.2 days
The month with the highest number of snowfall days is December (9.3 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average daylight in May /
Average sunshine in May
Saint John, WA
- Average daylight in May: 15h and 1min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in May: 10h and 4min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in May
Saint John, WA
- Average sunshine days in May: 20.5 days
The month with the most sunshine days is July (26.6 days).
The month with the least sunshine days is February (15.9 days).
Average UV index in May
Saint John, WA
- Average UV index in May: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in May
Saint John, WA
- Average cloud cover in May: 30
The months with the most cloud cover are January and December (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in May
Saint John, WA
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Saint John, Washington, USA
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