May weather forecastOtaru, Japan

May

Weather in May

May brings a significantly warmer climate to the city of Otaru. It is notably the first month of the year with an average high temperature exceeding 10°C (50°F), a significant jump from the 7°C (44.6°F) in April. An increase in rainfall dampens the warmer period and contributes to heightened humidity. Sea temperatures become more inviting, hinting at the start of the beach season. Furthermore, an increasing UV index signals a need for heightened sun protection.

Temperature

The shift from April to May in Otaru sees an increase in the average high-temperature, transitioning from a frosty 7°C (44.6°F) to a refreshing 13.8°C (56.8°F). An average low-temperature of 6.4°C (43.5°F) is common in Otaru during the nights of May.

Humidity

The average relative humidity in May in Otaru, Japan, is 80%.

Rainfall

In Otaru, during May, the rain falls for 14.4 days and regularly aggregates up to 54mm (2.13") of precipitation. In Otaru, Japan, during the entire year, the rain falls for 151.8 days and collects up to 851mm (33.5") of precipitation.

Snowfall

January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.3 snowfall days, in May, Otaru aggregates 1mm (0.04") of snow. In Otaru, during the entire year, snow falls for 103.4 days and aggregates up to 1437mm (56.57") of snow.

Sea temperature

In Otaru, the average seawater temperature in May is 10.1°C (50.2°F).
Note: To swim in 10.1°C (50.2°F) at less than 10°C (50°F), ensure you're well-protected. Without it, be prepared for a sudden jolt of cold and breathing issues. Remember, even 13°C (55.4°F) is not welcoming.

Daylight

In May, the average length of the day is 14h and 40min.
On the first day of the month, sunrise is at 04:29 and sunset at 18:37. On the last day of May, in Otaru, sunrise is at 03:59 and sunset at 19:08 JST.

Sunshine

The months with the most sunshine are May and August, with an average of 8.4h of sunshine.

UV index

In Otaru, the average daily maximum UV index in May is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum UV index, 4 during May, leads to the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature in Otaru, Japan, during May is 13.8°C (56.8°F) and the low-temperature is 6.4°C (43.5°F).

The average relative humidity in May is 80%.

In Otaru, during May, the rain falls for 14.4 days and regularly aggregates up to 54mm (2.13") of precipitation.

May is the last month it regularly snows in Otaru. During 0.3 snowfall days, in May, Otaru aggregates 1mm (0.04") of snow.

In May, the average sea temperature in Otaru is 10.1°C (50.2°F). Swimming in 10.1°C (50.2°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

In May, the average day length is 14h and 40min.

On the first day of May in Otaru, Japan, sunrise is at 04:29 and sunset at 18:37. On the last day of the month, sunrise is at 03:59 and sunset at 19:08 JST.

The months with the most sunshine are May and August, with an average of 8.4h of sunshine.

In May, the average sunshine duration in Otaru, Japan, is 8.4h.

In May, the average daily maximum UV index in Otaru, Japan, is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

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

Apr

May

Jun

Average high temperature

7°C

13.8°C

17.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

16.1km/h

13.7km/h

11.2km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

4.6

0.3

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

12.7

14.8

10.8

Average UV index

Average cloud cover

Average visibility

Average temperature in May
Otaru, Japan

Average high temperature in May: 13.8°C

The warmest month (with the highest average high temperature) is August (23°C).
The month with the lowest average high temperature is January (-3.3°C).

Average low temperature in May: 6.4°C

The month with the highest average low temperature is August (16.8°C).
The coldest month (with the lowest average low temperature) is February (-8.2°C).

Average pressure in May
Otaru, Japan

Average pressure in May: 1010.2mbar

The month with the highest atmospheric pressure is November (1016.1mbar).
The month with the lowest atmospheric pressure is July (1008.5mbar).

Average wind speed in May
Otaru, Japan

Average wind speed in May: 12.8km/h

The windiest month (with the highest average wind speed) is December (19km/h).
The calmest month (with the lowest average wind speed) is July (9.2km/h).

Average humidity in May
Otaru, Japan

Average humidity in May: 80%

The month with the highest relative humidity is July (88%).
The months with the lowest relative humidity are April and October (79%).

Average rainfall in May
Otaru, Japan

Average rainfall in May: 54mm

The wettest month (with the highest rainfall) is August (119mm).
The driest month (with the least rainfall) is April (43mm).

Average rainfall days in May
Otaru, Japan

Average rainfall days in May: 14.4 days

The month with the highest number of rainy days is July (20.2 days).
The month with the least rainy days is February (2.5 days).

Average snowfall in May
Otaru, Japan

Average snowfall in May: 1mm

The month with the highest snowfall is January (369mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in May
Otaru, Japan

Average snowfall days in May: 0.3 days

The month with the highest number of snowfall days is January (26 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in May
Otaru, Japan

Average sea temperature in May: 10.1°C

The best month for swimming (with the highest average sea temperature) is August (21.6°C).
The coldest months (with the lowest average sea temperature) are February and March (5.3°C).

Average daylight in May /
Average sunshine in May
Otaru, Japan

Average daylight in May: 14h and 42min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

Average sunshine in May: 8h and 24min

The months with the most sunshine are May and August (Average sunshine: 8h and 24min).
The month with the least sunshine is January (Average sunshine: 1h and 12min).

Average sunshine days in May
Otaru, Japan

Average sunshine days in May: 14.8 days

The month with the most sunshine days is May (14.8 days).
The month with the least sunshine days is January (3.1 days).

Average UV index in May
Otaru, Japan

Average UV index in May: 4

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).