May weather forecastSaint John, WA
May
Weather in May
May, the last month of the spring in Saint John, is a refreshing month, with an average temperature varying between 44.2°F (6.8°C) and 65.7°F (18.7°C).Temperature
Saint John sees an increase in the average high-temperature with the arrival of May, moving from April's refreshing 55.9°F (13.3°C) to an enjoyable 65.7°F (18.7°C). During May, Saint John's temperature falls to a steady low-temperature average of 44.2°F (6.8°C).Humidity
The average relative humidity in May is 61%.Rainfall
The wettest months are January and May, with an average 0.91" (23mm) of rainfall.Snowfall
January through May, September, November and December are months with snowfall. 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, there are 32.5 snowfall days, and 14.09" (358mm) of snow is accumulated.Daylight
In May, the average length of the day is 15h and 6min.On the first day of the month, sunrise is at 5:32 am and sunset at 8:01 pm. On the last day of May, sunrise is at 4:58 am and sunset at 8:37 pm PDT.
Sunshine
In May, the average sunshine is 10.6h.UV index
In May, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A maximum high UV index of 4 in May translates into the following recommendations:
Undertake protective steps - Preventing sun damage is advised. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 6min
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 36min
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).
