May weather forecastJuneau, AK
May
Weather in May
As the peak of spring arrives in May, the weather becomes noticeably milder in Juneau. The last traces of snow vanish, replaced by sporadic rain showers, particularly as the month progresses. As the temperature continues to rise, the landscape bursts with the freshness of the budding greenery. Additionally, this is the time when the sea begins to warm, reviving aquatic activities. With the longest daylight hours of the year, May truly brings the charm of the Alaskan spring to light.Temperature
The transition to May introduces an increase in the average high-temperature, shifting from an icy 37°F (2.8°C) in April to a chilly 47.5°F (8.6°C). In the month of May, the average low-temperature usually rests at a wintry 35.2°F (1.8°C).Humidity
With an average relative humidity of 86%, May is the least humid month.Rainfall
The month with the least rainfall is May, when the rain falls for 18.5 days and typically collects 4.13" (105mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Juneau. May is the last month it regularly snows. During 3.2 snowfall days, in May, Juneau aggregates 3.31" (84mm) of snow. Throughout the year, there are 126.6 snowfall days, and 290.12" (7369mm) of snow is accumulated.Ocean temperature
In Juneau, in May, the average water temperature is 44.2°F (6.8°C).Note: With an efficient thermal swimsuit, one can navigate 44.2°F (6.8°C) even if it's colder than 50°F (10°C); otherwise, rapid cold shock and breathlessness might set in. Barely wading at 55.4°F (13°C) feels chilly.
Daylight
The average length of the day in May is 16h and 50min.On the first day of May in Juneau, sunrise is at 5:00 am and sunset at 8:48 pm. On the last day of the month, sunrise is at 4:01 am and sunset at 9:49 pm AKDT.
Sunshine
In May, the average sunshine is 6.2h.UV index
May and July, with an average maximum UV index of 3, are months with the highest UV index. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In May, a daily UV index of 3 turns into the following recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Juneau, AK
- Average high temperature in May: 47.5°F
The warmest month (with the highest average high temperature) is July (55.8°F).
The months with the lowest average high temperature are January and December (25.7°F).
- Average low temperature in May: 35.2°F
The month with the highest average low temperature is July (45.1°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).
Average pressure in May
Juneau, AK
- Average pressure in May: 29.99"Hg
The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).
Average wind speed in May
Juneau, AK
- Average wind speed in May: 4.1mph
The windiest month (with the highest average wind speed) is January (6.9mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).
Average humidity in May
Juneau, AK
- Average humidity in May: 86%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (86%).
Average rainfall in May
Juneau, AK
- Average rainfall in May: 4.13"
The wettest month (with the highest rainfall) is October (9.88").
The driest month (with the least rainfall) is May (4.13").
Average rainfall days in May
Juneau, AK
- Average rainfall days in May: 18.5 days
The month with the highest number of rainy days is September (21.9 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in May
Juneau, AK
- Average snowfall in May: 3.31"
The month with the highest snowfall is December (62.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Juneau, AK
- Average snowfall days in May: 3.2 days
The month with the highest number of snowfall days is January (21.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in May
Juneau, AK
- Average sea temperature in May: 44.1°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 March (40.3°F).
Average daylight in May /
Average sunshine in May
Juneau, AK
- Average daylight in May: 16h and 48min
The month with the longest days is June (Average daylight: 18h and 12min).
The month with the shortest days is December (Average daylight: 6h and 30min).
- Average sunshine in May: 6h and 12min
The month with the most sunshine is June (Average sunshine: 6h and 24min).
The month with the least sunshine is November (Average sunshine: 2h and 36min).
Average sunshine days in May
Juneau, AK
- Average sunshine days in May: 10 days
The month with the most sunshine days is May (10 days).
The month with the least sunshine days is November (6.1 days).
Average UV index in May
Juneau, AK
- Average UV index in May: 3
The months with the highest UV index are May and July (UV index 3).
The months with the lowest UV index are January, April, October, November and December (UV index 1).
Average cloud cover in May
Juneau, AK
- Average cloud cover in May: 61
The months with the most cloud cover are January and November (Cloud cover 72).
The month with the least cloud cover is May (Cloud cover 61).
Average visibility in May
Juneau, AK
- Average visibility in May: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
