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 May arrives, Issaquah's weather shows a minor increase in high-temperatures, edging from April's mild 55.9°F (13.3°C) to a comfortable 64.6°F (18.1°C). Nightly readings in May display a noticeable downturn from daily highs in Issaquah, with the average low-temperature registering an icy 42.4°F (5.8°C).Humidity
In May, the average relative humidity is 75%.Rainfall
In Issaquah, during May, the rain falls for 9.6 days and regularly aggregates up to 0.63" (16mm) of precipitation. In Issaquah, during the entire year, the rain falls for 127.4 days and collects up to 12.52" (318mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
In May, the average length of the day is 15h and 9min.On the first day of May, 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 is 8.8h.UV index
In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: An average maximum UV index of 4 in May leads to these recommendations:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in May?
What is the average humidity in May?
How much does it rain in May?
When it does not snow?
Does it snow in Issaquah in May?
What is the average length of the day in May?
What time are sunrise and sunset in May?
How long on average sun shines in May?
How high is the UV index in May?
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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