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 in Issaquah brings a minor temperature shift, with the average high-temperature moving from a refreshing 55.9°F (13.3°C) in April to an enjoyable 64.6°F (18.1°C). May nights in Issaquah report a substantial dip from daytime highs to an average of 42.4°F (5.8°C).Humidity
In Issaquah, Washington, the average relative humidity in May is 75%.Rainfall
In Issaquah, in May, it is raining for 9.6 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, in Issaquah, Washington, there are 127.4 rainfall days, and 12.52" (318mm) of precipitation is accumulated.Snowfall
In Issaquah, Washington, snow does not fall in May through October.Daylight
In Issaquah, the average length of the day in May is 15h and 9min.On the first day of May in Issaquah, sunrise is at 5:49 am and sunset at 8:20 pm. On the last day of the month, sunrise is at 5:14 am and sunset at 8:57 pm PDT.
Sunshine
The average sunshine in May in Issaquah is 8.8h.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 average individuals.Note: An average UV index of 4 in May transforms into this advice:
Act with care - The need to guard against sun damage is communicated. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Frequently asked questions
What is the usual temperature for Issaquah in May?
What is the average humidity in May in Issaquah?
How much does it rain in Issaquah in May?
When it does not snow in Issaquah?
Does it snow in Issaquah in May?
What is the average length of the day in May in Issaquah?
When are sunrise and sunset in May in Issaquah?
How many hours of sunshine does Issaquah have in May?
What is the UV index reading in May in Issaquah?
Average temperature in May
Issaquah, WA
- Average high temperature in May: 64.6°F
The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in May: 42.4°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 (33.4°F).
Average pressure in May
Issaquah, WA
- Average pressure in May: 30.02"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in May
Issaquah, WA
- Average wind speed in May: 3.8mph
The windiest month (with the highest average wind speed) is January (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in May
Issaquah, WA
- Average humidity in May: 75%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in May
Issaquah, WA
- Average rainfall in May: 0.63"
The wettest month (with the highest rainfall) is December (2.01").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in May
Issaquah, WA
- Average rainfall days in May: 9.6 days
The month with the highest number of rainy days is March (14.8 days).
The month with the least rainy days is August (4.3 days).
Average snowfall in May
Issaquah, WA
- Average snowfall in May: 0"
The month with the highest snowfall is February (0.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Issaquah, WA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (2.5 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
Issaquah, 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: 8h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).
Average sunshine days in May
Issaquah, WA
- Average sunshine days in May: 18.4 days
The month with the most sunshine days is August (25 days).
The month with the least sunshine days is February (12.9 days).
Average UV index in May
Issaquah, 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, November and December (UV index 2).
Average cloud cover in May
Issaquah, WA
- Average cloud cover in May: 46
The months with the most cloud cover are January and December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in May
Issaquah, WA
- Average visibility in May: 5mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).
Issaquah, Washington, USA
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