Otaru
Japan
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Otaru, Japan

The first month of the autumn, September, is still a pleasant month in Otaru, Japan, with average temperature fluctuating between 21.9°C (71.4°F) and 13.9°C (57°F).

Temperature

In September, the average high-temperature slightly decreases, from a warm 25.6°C (78.1°F) in August, to an agreeable 21.9°C (71.4°F). The average low-temperature, in Otaru, Japan, is 13.9°C (57°F).

Humidity

In Otaru, the average relative humidity in September is 72%.

Rainfall

In Otaru, during 12.5 rainfall days, 125.6mm (4.9") of precipitation is typically accumulated. Throughout the year, in Otaru, there are 193 rainfall days, and 1235mm (48.6") of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Sea temperature

In Otaru, Japan, the average water temperature is 20.6°C (69.1°F).
Note: For most, swimming in 20.6°C (69.1°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in Otaru is 12.5h.

Sunshine

The average sunshine in September is 5.5h.

What is the temperature in September in Otaru?

In Otaru, Japan, in September, the average high-temperature is 21.9°C (71.4°F), and the average low-temperature is 13.9°C (57°F).

What is the average humidity in September in Otaru?

In September, the average relative humidity in Otaru is 72%.

How much does it rain in Otaru in September?

In Otaru, Japan, in September, it is raining for 12.5 days, with typically 125.6mm (4.9") of accumulated precipitation.

Does it snow in Otaru in September?

In Otaru, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Otaru?

In Otaru, Japan, snow does not fall in May through September.

How cold is the water in September in Otaru?

In September, the average sea temperature in Otaru, Japan, is 20.6°C (69.1°F). For swimming, a surface water temperature of 20.6°C (69.1°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

How many hours of daylight does Otaru have in September?

The average length of the day in September in Otaru, Japan, is 12.5h.

How long on average sun shines in September in Otaru?

The average sunshine in September in Otaru is 5.5h.
Average temperature in September - Otaru, Japan
  • Average high temperature in September: 21.9°C

The warmest month (with the highest average high temperature) is August (25.6°C).
The month with the lowest average high temperature is January (-0.7°C).

  • Average low temperature in September: 13.9°C

The month with the highest average low temperature is August (18.4°C).
The coldest month (with the lowest average low temperature) is January (-6.1°C).

Average humidity in September - Otaru, Japan
  • Average humidity in September: 72%

The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is April (64%).

Average rainfall in September - Otaru, Japan
  • Average rainfall in September: 125.6mm

The wettest month (with the highest rainfall) is November (146.8mm).
The driest month (with the lowest rainfall) is June (46.3mm).

Average rainfall days in September - Otaru, Japan
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is January (25.5 days).
The month with the lowest number of rainy days is June (8.6 days).

Average snowfall in September - Otaru, Japan
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (1940mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

Average snowfall days in September - Otaru, Japan
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (29.4 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

Average sea temperature in September - Otaru, Japan
  • Average sea temperature in September: 20.6°C

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

Average daylight in September / Average sunshine in September - Otaru, Japan
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in September: 5.5h

The month with most sunshine is May (Average sunshine: 6.5h).
The month with least sunshine is December (Average sunshine: 2h).