September weather forecast
Otaru, Japan

Weather in September

September, the first month of the autumn in Otaru, is also an enjoyable month, with temperature in the range of an average high of 19.5°C (67.1°F) and an average low of 13.2°C (55.8°F).

Temperature

In September, the average high-temperature marginally drops from a moderately hot 23°C (73.4°F) in August to a comfortable 19.5°C (67.1°F). The average low-temperature, in Otaru, is 13.2°C (55.8°F).

Humidity

In September, the average relative humidity in Otaru is 83%.

Rainfall

In September, in Otaru, the rain falls for 18.3 days. Throughout September, 86mm (3.39") of precipitation is accumulated. Throughout the year, there are 151.8 rainfall days, and 851mm (33.5") of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Otaru.

Sea temperature

In Otaru, in September, the average water temperature is 20.6°C (69.1°F).
Note: 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).

Daylight

In September, the average length of the day is 12h and 31min.
On the first day of September in Otaru, Japan, sunrise is at 04:59 and sunset at 18:12. On the last day of the month, sunrise is at 05:31 and sunset at 17:20 JST.

Sunshine

The average sunshine in September in Otaru is 7.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Otaru?

In Otaru, in September, the average high-temperature is 19.5°C (67.1°F), and the average low-temperature is 13.2°C (55.8°F).

What is the average humidity in September in Otaru?

The average relative humidity in September in Otaru, Japan, is 83%.

How much does it rain in Otaru in September?

In September, in Otaru, Japan, the rain falls for 18.3 days. Throughout September, 86mm (3.39") of precipitation is accumulated.

When it does not snow in Otaru?

June through September are months without snowfall in Otaru, Japan.

Does it snow in Otaru in September?

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

What is the sea temperature in September in Otaru?

In Otaru, Japan, the average seawater temperature in September 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).

What is the average length of the day in September in Otaru?

The average day length in September is 12h and 31min.

What time are sunrise and sunset in September in Otaru?

On the first day of September, sunrise is at 04:59 and sunset at 18:12. On the last day of the month, sunrise is at 05:31 and sunset at 17:20 JST.

How long on average sun shines in September in Otaru?

In September, the average sunshine duration in Otaru, Japan, is 7.7h.

How high is the UV index in September in Otaru?

In Otaru, Japan, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Otaru, Japan

Average temperature in September - Otaru, Japan
  • Average high temperature in September: 19.5°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 September: 13.2°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).

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Average pressure in September
Otaru, Japan

Average pressure in September - Otaru, Japan
  • Average pressure in September: 1013.4mbar

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

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Average wind speed in September
Otaru, Japan

Average wind speed in September - Otaru, Japan
  • Average wind speed in September: 11.9km/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).

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Average humidity in September
Otaru, Japan

Average humidity in September - Otaru, Japan
  • Average humidity in September: 83%

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

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Average rainfall in September
Otaru, Japan

Average rainfall in September - Otaru, Japan
  • Average rainfall in September: 86mm

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

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Average rainfall days in September
Otaru, Japan

Average rainfall days in September - Otaru, Japan
  • Average rainfall days in September: 18.3 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).

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Average snowfall in September
Otaru, Japan

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

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

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Average snowfall days in September
Otaru, Japan

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 (26 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Otaru, Japan

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).
The coldest months (with the lowest average sea temperature) are February and March (5.3°C).

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

Average daylight in September / Average sunshine in September - Otaru, Japan
  • Average daylight in September: 12h and 31min

The month with the longest days is June (Average daylight: 15h and 20min).
The month with the shortest days is December (Average daylight: 9h and 3min).

  • Average sunshine in September: 7h and 42min

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).

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Average sunshine days in September
Otaru, Japan

Average sunshine days in September - Otaru, Japan
  • Average sunshine days in September: 9.2 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).

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Average UV index in September
Otaru, Japan

Average UV index in September - Otaru, Japan
  • Average UV index in September: 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).

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Average cloud cover in September
Otaru, Japan

Average cloud cover in September - Otaru, Japan
  • Average cloud cover in September: 42

The month with the most cloud cover is January (Cloud cover 89).
The month with the least cloud cover is September (Cloud cover 42).

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Average visibility in September
Otaru, Japan

Average visibility in September - Otaru, Japan
  • Average visibility in September: 9km

The month with the highest visibility is October (10km).
The month with the lowest visibility is January (7km).

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