Otaru (Japan) in general has a mild continental climate. The day temperatures range from -1.1 °C (30.0 °F) in January to 24.6 °C (76.3 °F) in August. Temperatures during the night go from -7.1 °C (19.2 °F) in January to 17.3 °C (63.1 °F) in August. The least rainy month in Otaru is June with its 10 days of rain, the rainiest month is January, when it rains 24 days.

January weather

The day temperature reaches its minimum, with its value of -1.1 °C (30.0 °F) in Otaru, while the sea temperature continues to descent, with its value being 6.8 °C (44.3 °F). The ongoing wet season is noticeable. The rainfall amount descent's start could be observed, its value is 139 mm (5.46 in), while the number of rainy days is on its maximum, the value of this measure is 24 days. The night temperature reaches its minimum, its value is -7.1 °C (19.2 °F).

February weather

The day temperature rise's start could be observed in Otaru, while the sea temperature is on its minimum, its value is 5.4 °C (41.8 °F). The wet season continues. The rainfall amount continues to descent, the value of this measure is 103 mm (4.06 in), while the number of rainy days descent's start could be observed in February. The rise of the number of sun hours (without clouds) can be observed, its value is 3 hours.

March weather

The descent of the number of rainy days can be observed, the value of this measure is 17 days in Otaru, and the descent of the rainfall amount can be observed as well, with its value being 78 mm (3.08 in). The day temperature rises similarly to the previous month, with its value being 3.2 °C (37.8 °F), while the night temperature rise's start could be observed. The rise of the number of sun hours (without clouds) can be observed, with its value being 5 hours.

April weather

The day temperature rises similarly to the previous month, with its value being 10.1 °C (50.2 °F) in Otaru, while the beginning of the rise of the sea temperature could be noticed, with its value being 7.0 °C (44.6 °F). The number of rainy days continues to descent, the value of this measure is 11 days, and the rainfall amount descents similarly to the previous month as well, its value is 61 mm (2.40 in). The rise of the night temperature can be observed, with its value of 1.6 °C (34.9 °F). The humidity is on its minimum, its value is 68 %.

May weather

The day temperature continues to rise in Otaru, and the sea temperature rises similarly to the previous month too, with its value being 9.7 °C (49.5 °F). The number of rainy days descents similarly to the previous month, its value is 10 days. The rise of the night temperature can be observed. The number of sun hours (without clouds) reaches its maximum, with its value being 6 hours.

June weather

The tourist season is at its beginning in June in Otaru. The day temperature rises similarly to the previous month, the value of this measure is 19.0 °C (66.2 °F), and the rise of the sea temperature can be observed too, with its value of 14.1 °C (57.3 °F). The number of rainy days reaches its minimum, with its value being 10 days, and the minimum of the rainfall amount can be noticed too in this month. The rise of the night temperature can be observed, with its value of 10.6 °C (51.1 °F).

July weather

The ongoing tourist season is noticeable in Otaru. The day temperature continues to rise, with its value being 22.5 °C (72.5 °F), and the sea temperature rises similarly to the previous month as well, the value of this measure is 18.1 °C (64.6 °F). The rainfall amount starts to rise, with its value being 103 mm (4.05 in). The wind speed reaches its minimum, with its value of 3.5. The rise of the night temperature can be observed, with its value being 15.3 °C (59.5 °F).

August weather

The ongoing tourist season is noticeable in August in Otaru. The day temperature reaches its maximum, and the maximum of the sea temperature is observable too, its value is 21.1 °C (70.0 °F). The rainfall amount rises similarly to the previous month, the value of this measure is 133 mm (5.24 in), while the number of rainy days starts to rise in August. The maximum of the night temperature is observable.

September weather

The tourist season continues this month in Otaru. The beginning of the descent of the sea temperature could be noticed, with its value of 20.5 °C (68.9 °F), and the day temperature starts to descent too in September. The number of rainy days continues to rise, the value of this measure is 13 days. The number of sun hours (without clouds) rise's start could be observed, with its value being 6 hours. The night temperature starts to descent, its value is 13.1 °C (55.6 °F).

October weather

The descent of the day temperature can be observed in Otaru, and the sea temperature continues to descent as well, with its value being 16.9 °C (62.4 °F). The rise of the number of rainy days can be observed, with its value being 16 days, while the rainfall amount descent's start could be observed, with its value being 119 mm (4.70 in). The night temperature continues to descent, the value of this measure is 6.9 °C (44.4 °F). The number of sun hours (without clouds) descent's start could be observed, with its value of 5 hours.

November weather

The wet season is at its beginning in Otaru. The descent of the day temperature can be observed, the value of this measure is 7.6 °C (45.7 °F), and the sea temperature descents similarly to the previous month too, its value is 12.6 °C (54.7 °F). The number of rainy days continues to rise, the value of this measure is 20 days, while the beginning of the rise of the rainfall amount could be noticed, its value is 145 mm (5.72 in). The night temperature continues to descent, with its value of 0.8 °C (33.4 °F).

December weather

The ongoing wet season is noticeable in December in Otaru. The day temperature descents similarly to the previous month, the value of this measure is 1.0 °C (33.8 °F), and the sea temperature continues to descent too, its value is 9.2 °C (48.5 °F). The rainfall amount is on its maximum, its value is 150 mm (5.91 in). The night temperature descents similarly to the previous month, its value is -4.6 °C (23.7 °F). The number of sun hours (without clouds) reaches its minimum in this month.

FAQs

Is May a good month to visit Otaru?

Otaru can be visited in May - the weather will be moderate. A relatively low temperature of 15.6 °C (60.1 °F) may be ideal for walking or outdoor activities, but some people may have a different idea of the holiday. The temperature of 6.2 °C (43.2 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.

What is the sea temperature in June in Otaru?

The sea will reach 14.1 °C (57.3 °F) in Otaru in June. This is a sea temperature for resilient people only, most people won't enjoy swimming in such cold water or will have to use a wetsuit for water activities.

Is July part of the wet season in Otaru?

No, there is no wet season in Otaru in July - you can expect 10 days of rain during the month.

Is it hot in Otaru in August?

In Otaru in August, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.

What temperature can I expect during the day in Otaru in September?

The average daily temperature in September in Otaru is 21.4 °C (70.5 °F). A comfortable temperature for most people, where it is neither too cold nor too hot, and a large number of activities can be carried out comfortably, including sunbathing by the water. Lighter clothing will be suitable - shorts, skirts, t-shirts, jackets; a light sweater and long trousers may also be useful.

How many rainy days can I expect in Otaru in October?

There are 16 days, which are rainy in Otaru in October, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 3.7 days of the week, or in general - 53 % days.