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 sea temperature 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 in Seattle introduces a subtle rise in the average high-temperature, nudging from a mild 56.5°F (13.6°C) in April to an enjoyable 64.8°F (18.2°C). Seattle cools down to an average low-temperature of 44.8°F (7.1°C) throughout the month of May.Humidity
In May, the average relative humidity is 75%.Rainfall
In May, in Seattle, the rain falls for 7 days. Throughout May, 0.39" (10mm) of precipitation is accumulated. Throughout the year, in Seattle, there are 84.2 rainfall days, and 5.2" (132mm) of precipitation is accumulated.Snowfall
April through October and December are months without snowfall in Seattle, Washington.Ocean temperature
In May, the average ocean temperature is 46.6°F (8.1°C).Note: Swimming in 46.6°F (8.1°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.
Daylight
In May, the average length of the day is 15h and 10min.On the first day of the month, sunrise is at 5:50 am and sunset at 8:22 pm. On the last day of May, sunrise is at 5:15 am and sunset at 8:58 pm PDT.
Sunshine
In May, the average sunshine is 9.2h.UV index
The average daily maximum UV index in May in Seattle is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The daily maximum UV index of 4 in May interprets into the following advice:
Act with care - The suggestion to avoid sunburn is emphasized. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Frequently asked questions
What is the usual temperature for Seattle in May?
What is the average humidity in May in Seattle?
How many days does it rain in May in Seattle?
When it does not snow in Seattle?
How cold is the water in May in Seattle?
How many hours of daylight does Seattle have in May?
When are sunrise and sunset in May in Seattle?
How many hours of sunshine does Seattle have in May?
What is the UV index reading in May in Seattle?
Average temperature in May
Seattle, WA
- Average high temperature in May: 64.8°F
The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in May: 44.8°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.1°F).
Average pressure in May
Seattle, WA
- Average pressure in May: 30.02"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in May
Seattle, WA
- Average wind speed in May: 4mph
The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in May
Seattle, WA
- Average humidity in May: 75%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in May
Seattle, WA
- Average rainfall in May: 0.39"
The wettest month (with the highest rainfall) is December (0.87").
The driest months (with the least rainfall) are July and August (0.12").
Average rainfall days in May
Seattle, WA
- Average rainfall days in May: 7 days
The month with the highest number of rainy days is November (9.1 days).
The month with the least rainy days is August (2.8 days).
Average snowfall in May
Seattle, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").
Average snowfall days in May
Seattle, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in May
Seattle, WA
- Average sea temperature in May: 46.6°F
The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).
Average daylight in May /
Average sunshine in May
Seattle, WA
- Average daylight in May: 15h and 1min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in May: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in May
Seattle, WA
- Average sunshine days in May: 20.3 days
The month with the most sunshine days is August (25.9 days).
The month with the least sunshine days is November (16.8 days).
Average UV index in May
Seattle, WA
- 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
Seattle, WA
- Average cloud cover in May: 41
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in May
Seattle, WA
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).
Seattle, Washington, USA
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