May weather - Spring 2024

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

Beautiful and colorful houses along the waterfront boardwalk on Creek Street in Ketchikan, Alaska

Weather in May

May in Ketchikan is characterized by pleasanter temperatures and the manifestation of spring in its full glory. The range of temperatures expands, from 43.5°F (6.4°C) to 53.4°F (11.9°C), instilling warmth in the air. Traces of snowfall, recorded at 0.08" (2mm), indicate the vanishing remnants of winter. Daylight stretches for an impressive 16.3 hours, accentuating the city's scenic beauty. May proposes an introduction to the charm of Alaskan summers.

Temperature

Ketchikan's transition into May is noticed by a slight rise in the average high-temperature, advancing from a frosty 46°F (7.8°C) in April to a cool 53.4°F (11.9°C). Ketchikan temperatures generally rest at a low of 43.5°F (6.4°C) during the May nights.

Humidity

The least humid month is May, with an average relative humidity of 82%.

Rainfall

May is the month with the least rainfall in Ketchikan. Rain falls for 17.1 days and accumulates 3.46" (88mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Ketchikan aggregates 0.08" (2mm) of snow. Throughout the year, in Ketchikan, there are 40.7 snowfall days, and 48.35" (1228mm) of snow is accumulated.

Ocean temperature

In May, the average ocean temperature is 48°F (8.9°C).
Note: Staying in 48°F (8.9°C) waters for just a few moments at 55.4°F (13°C) can be harrowing, and below 50°F (10°C) poses breathing and cold shock risks, depending on individual tolerance.

Daylight

In Ketchikan, the average length of the day in May is 16h and 15min.
On the first day of the month, sunrise is at 5:02 am and sunset at 8:24 pm. On the last day of May, sunrise is at 4:12 am and sunset at 9:16 pm AKDT.

Sunshine

May has the most sunshine of the year, with an average of 7.2h of sunshine.

UV index

In Ketchikan, the average daily maximum UV index in May is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index, 3 in May, converts into the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Experience reduced UV exposure by about half when donning a wide-brim hat. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.

Updated: Jun 3, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Ketchikan in May?

The high-temperature, in May, in Ketchikan, is 53.4°F (11.9°C), while the low-temperature averages to 43.5°F (6.4°C).

What is the least humid month?

May is the least humid month, with an average relative humidity of 82%.

What is the average humidity in May?

In Ketchikan, the average relative humidity in May is 82%.

What is the driest month?

The month with the least rainfall is May, when the rain falls for 17.1 days and typically collects 3.46" (88mm) of precipitation.

How much does it rain in May?

In Ketchikan, during May, the rain falls for 17.1 days and regularly aggregates up to 3.46" (88mm) of precipitation.

What is the last month it snows?

May is the last month it regularly snows. During 0.1 snowfall days, in May, Ketchikan aggregates 0.08" (2mm) of snow.

What is the water temperature in May?

In Ketchikan, in May, the average water temperature is 48°F (8.9°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in May?

The average day length in May is 16h and 15min.

What time are sunrise and sunset in May?

On the first day of May, sunrise is at 5:02 am and sunset at 8:24 pm. On the last day of the month, sunrise is at 4:12 am and sunset at 9:16 pm AKDT.

What month has the most sunshine?

With an average of 7.2h of sunshine, May has the most sunshine of the year in Ketchikan.

How many hours of sunshine does Ketchikan have in May?

In May, the average sunshine duration is 7.2h.

What is the UV index intensity in May?

The average daily maximum UV index in May is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A May J J A S O N D

Apr

May

Jun

Average high temperature

46°F 7.8°C

53.4°F 11.9°C

56.7°F 13.7°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.5mph 12.1km/h

5.9mph 9.5km/h

6mph 9.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

2.5

0.1

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

7.4

11.8

9.2

Average UV index

Average cloud cover

Average visibility

Average temperature in May
Ketchikan, AK

Average high temperature in May: 53.4°F

The warmest months (with the highest average high temperature) are July and August (60.8°F).
The month with the lowest average high temperature is December (35.8°F).

Average low temperature in May: 43.5°F

The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is February (30.6°F).

Average pressure in May
Ketchikan, AK

Average pressure in May: 30.01"Hg

The month with the highest atmospheric pressure is July (30.06"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).

Average wind speed in May
Ketchikan, AK

Average wind speed in May: 5.5mph

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in May
Ketchikan, AK

Average humidity in May: 82%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (82%).

Average rainfall in May
Ketchikan, AK

Average rainfall in May: 3.46"

The wettest month (with the highest rainfall) is January (9.69").
The driest month (with the least rainfall) is May (3.46").

Average rainfall days in May
Ketchikan, AK

Average rainfall days in May: 17.1 days

The month with the highest number of rainy days is November (21.4 days).
The month with the least rainy days is February (14.2 days).

Average snowfall in May
Ketchikan, AK

Average snowfall in May: 0.08"

The month with the highest snowfall is February (13.11").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in May
Ketchikan, AK

Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is March (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in May
Ketchikan, AK

Average sea temperature in May: 48.1°F

The best month for swimming (with the highest average sea temperature) is August (55.9°F).
The coldest month (with the lowest average sea temperature) is March (42.5°F).

Average daylight in May /
Average sunshine in May
Ketchikan, AK

Average daylight in May: 16h and 2min

The month with the longest days is June (Average daylight: 17h and 24min).
The month with the shortest days is December (Average daylight: 7h and 12min).

Average sunshine in May: 7h and 1min

The month with the most sunshine is May (Average sunshine: 7h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in May
Ketchikan, AK

Average sunshine days in May: 11.8 days

The month with the most sunshine days is July (11.9 days).
The month with the least sunshine days is November (5.6 days).

Average UV index in May
Ketchikan, AK

Average UV index in May: 3

The months with the highest UV index are July and August (UV index 4).
The months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover in May
Ketchikan, AK

Average cloud cover in May: 55

The month with the most cloud cover is January (Cloud cover 71).
The month with the least cloud cover is May (Cloud cover 55).

Average visibility in May
Ketchikan, AK

Average visibility in May: 6mi

The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).

May weather forecast
Ketchikan, AK

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