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 advent of May in Unalaska observes an average high-temperature of a still cold 41.4°F (5.2°C), nearly identical to April's 37.4°F (3°C). Unalaska encounters a negligible difference from daytime peaks throughout the May nights, with a low-temperature average of 37.9°F (3.3°C).Humidity
In May, the average relative humidity is 87%.Rainfall
In May, the rain falls for 18.8 days. Throughout May, 2.36" (60mm) of precipitation is accumulated. In Unalaska, during the entire year, the rain falls for 198.8 days and collects up to 33.78" (858mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows. During 4.1 snowfall days, in May, Unalaska aggregates 1.18" (30mm) of snow. In Unalaska, during the entire year, snow falls for 78.3 days and aggregates up to 30.39" (772mm) of snow.Ocean temperature
In May, the average ocean temperature is 41.4°F (5.2°C).Note: Swimming in 41.4°F (5.2°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 16h and 1min.On the first day of May, sunrise is at 7:27 am and sunset at 10:38 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 11:26 pm AKDT.
Sunshine
In Unalaska, the average sunshine in May is 5.2h.UV index
The average daily maximum UV index in May is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: A daily maximum UV index of 2 in May translates into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Boost your sun resistance with garments that are densely woven yet spacious. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is May?
What is the average humidity in May?
How much does it rain in May?
What is the last month it snows?
What is the water temperature in May?
What is the average length of the day in May?
When is the sunrise / sunset in May?
How many hours of sunshine does Unalaska have in May?
What is the UV index reading in May?
Average temperature in May
Unalaska, AK
- Average high temperature in May: 41.4°F
The warmest month (with the highest average high temperature) is August (53.2°F).
The month with the lowest average high temperature is March (34.7°F).
- Average low temperature in May: 37.9°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is March (30.7°F).
Average pressure in May
Unalaska, AK
- Average pressure in May: 29.84"Hg
The month with the highest atmospheric pressure is July (29.98"Hg).
The month with the lowest atmospheric pressure is January (29.5"Hg).
Average wind speed in May
Unalaska, AK
- Average wind speed in May: 10.8mph
The windiest months (with the highest average wind speed) are November and December (16.5mph).
The calmest month (with the lowest average wind speed) is July (9.1mph).
Average humidity in May
Unalaska, AK
- Average humidity in May: 87%
The month with the highest relative humidity is July (91%).
The months with the lowest relative humidity are November and December (80%).
Average rainfall in May
Unalaska, AK
- Average rainfall in May: 2.36"
The wettest month (with the highest rainfall) is December (4.21").
The driest month (with the least rainfall) is July (1.85").
Average rainfall days in May
Unalaska, AK
- Average rainfall days in May: 18.8 days
The month with the highest number of rainy days is October (21.8 days).
The month with the least rainy days is February (11.1 days).
Average snowfall in May
Unalaska, AK
- Average snowfall in May: 1.18"
The month with the highest snowfall is January (6.97").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Unalaska, AK
- Average snowfall days in May: 4.1 days
The month with the highest number of snowfall days is January (14.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in May
Unalaska, AK
- Average sea temperature in May: 41.4°F
The best month for swimming (with the highest average sea temperature) is August (50.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).
Average daylight in May /
Average sunshine in May
Unalaska, AK
- Average daylight in May: 16h and 0min
The month with the longest days is June (Average daylight: 17h and 0min).
The month with the shortest days is December (Average daylight: 7h and 30min).
- Average sunshine in May: 5h and 1min
The month with the most sunshine is June (Average sunshine: 5h and 48min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average sunshine days in May
Unalaska, AK
- Average sunshine days in May: 7.8 days
The month with the most sunshine days is August (9.7 days).
The month with the least sunshine days is April (3.8 days).
Average UV index in May
Unalaska, AK
- Average UV index in May: 2
The months with the highest UV index are July and August (UV index 3).
The months with the lowest UV index are February, March, April and November (UV index 1).
Average cloud cover in May
Unalaska, AK
- Average cloud cover in May: 70
The month with the most cloud cover is July (Cloud cover 74).
The months with the least cloud cover are September and October (Cloud cover 66).
Average visibility in May
Unalaska, AK
- Average visibility in May: 6mi
The months with the highest visibility are May, June, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April, July and December (5mi).
Unalaska, Alaska, USA
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