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
As April gives way to May, the average high-temperature displays a slight ascent, adjusting from a cool 54°F (12.2°C) to a refreshing 62.6°F (17°C). Sumas observes an average low-temperature of 43°F (6.1°C) during May.Humidity
The average relative humidity in May is 77%.Rainfall
In May, the rain falls for 14.3 days. Throughout May, 2.52" (64mm) of precipitation is accumulated. In Sumas, during the entire year, the rain falls for 188 days and collects up to 49.88" (1267mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In May, the average length of the day is 15h and 19min.On the first day of the month, sunrise is at 5:46 am and sunset at 8:25 pm. On the last day of May, sunrise is at 5:09 am and sunset at 9:04 pm PDT.
Sunshine
In May, the average sunshine in Sumas is 9h.UV index
In May, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: The daily maximum UV index of 4 in May interprets into the following advice:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Frequently asked questions
What is the usual temperature for Sumas in May?
What is the average humidity in May in Sumas?
How many days does it rain in May in Sumas?
When it does not snow in Sumas?
Does it snow in Sumas in May?
How many hours of daylight does Sumas have in May?
What time are sunrise and sunset in May in Sumas?
How many hours of sunshine does Sumas have in May?
What is the UV index intensity in May in Sumas?
Average temperature in May
Sumas, WA
- Average high temperature in May: 62.6°F
The warmest month (with the highest average high temperature) is August (73.6°F).
The month with the lowest average high temperature is December (39.6°F).
- Average low temperature in May: 43°F
The month with the highest average low temperature is August (51.4°F).
The coldest months (with the lowest average low temperature) are February and December (31.6°F).
Average pressure in May
Sumas, WA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March and August (30"Hg).
Average wind speed in May
Sumas, WA
- Average wind speed in May: 3.6mph
The windiest months (with the highest average wind speed) are January and February (4.7mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in May
Sumas, WA
- Average humidity in May: 77%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is July (73%).
Average rainfall in May
Sumas, WA
- Average rainfall in May: 2.52"
The wettest month (with the highest rainfall) is November (7.72").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in May
Sumas, WA
- Average rainfall days in May: 14.3 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is August (7.8 days).
Average snowfall in May
Sumas, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (3.11").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Sumas, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (4.7 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
Sumas, WA
- Average daylight in May: 15h and 2min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in May: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days in May
Sumas, WA
- Average sunshine days in May: 13.3 days
The months with the most sunshine days are July and August (21 days).
The month with the least sunshine days is March (8.4 days).
Average UV index in May
Sumas, WA
- Average UV index in May: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in May
Sumas, WA
- Average cloud cover in May: 44
The month with the most cloud cover is March (Cloud cover 60).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in May
Sumas, WA
- Average visibility in May: 5mi
The months with the highest visibility are April, May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
Sumas, Washington, USA
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