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Weather in Otaru for September 2025

Your guide to Otaru weather in September - trends and predictions
  • In general, the average temperature in Otaru at the beginning of September is 23.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.1 °C by the end of September.

  • Expect significant rainfall in Otaru during September, with an average of 18 rainy days.

  • Is September a good time to visit Otaru? check out the best time to travel to Otaru page.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/15°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Otaru in September average weather

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Temperatures trend during September in Otaru

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
24° /15° 0 mm 6
2 Sept. Patchy rain possible
Patchy rain possible
23° /15° 1 mm 5
3 Sept. Sunny
Sunny
24° /16° 0.1 mm 6
4 Sept. Light rain shower
Light rain shower
25° /15° 1.4 mm 6
5 Sept. Light rain shower
Light rain shower
25° /16° 2.8 mm 6
6 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
22° /17° 11.8 mm 5
7 Sept. Patchy rain possible
Patchy rain possible
22° /13° 1.2 mm 6
8 Sept. Sunny
Sunny
24° /13° 0 mm 7
9 Sept. Cloudy
Cloudy
24° /15° 0 mm 6
10 Sept. Light rain shower
Light rain shower
25° /16° 1.1 mm 6
11 Sept. Cloudy
Cloudy
24° /16° 3.8 mm 6
12 Sept. Moderate rain
Moderate rain
23° /15° 3.6 mm 5
13 Sept. Mist
Mist
24° /13° 1 mm 5
14 Sept. Moderate rain
Moderate rain
20° /13° 15 mm 5
15 Sept. Sunny
Sunny
20° /13° 10.6 mm 5
16 Sept. Overcast
Overcast
22° /12° 0 mm 5
17 Sept. Overcast
Overcast
22° /14° 0.9 mm 5
18 Sept. Light drizzle
Light drizzle
23° /15° 1.7 mm 6
19 Sept. Patchy rain possible
Patchy rain possible
22° /14° 0.3 mm 5
20 Sept. Patchy rain possible
Patchy rain possible
18° /12° 2.2 mm 4
21 Sept. Patchy rain possible
Patchy rain possible
16° /10° 0.5 mm 4
22 Sept. Sunny
Sunny
18° /9° 0.3 mm 5
23 Sept. Light rain shower
Light rain shower
18° /10° 0.6 mm 4
24 Sept. Cloudy
Cloudy
19° /9° 0 mm 5
25 Sept. Patchy rain possible
Patchy rain possible
20° /10° 0.1 mm 5
26 Sept. Moderate rain at times
Moderate rain at times
21° /12° 1.8 mm 5
27 Sept. Partly cloudy
Partly cloudy
21° /12° 0.8 mm 6
28 Sept. Light rain shower
Light rain shower
19° /13° 25.8 mm 4
29 Sept. Patchy rain possible
Patchy rain possible
20° /11° 1 mm 5
30 Sept. Cloudy
Cloudy
21° /11° 0 mm 6
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Important Notice
Our weather forecast for Otaru in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Otaru forecast closer to your planned date for the most up-to-date weather information.

Otaru in September - FAQ

What are the expected maximum and minimum temperatures in Otaru during September?
During September, expect a variety of temperatures with highs around 22° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Otaru during September?
Significant rainfall exceeding 107 mm is expected in Otaru during September, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Otaru during September?
The average wind speed in Otaru during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Otaru in September?

As you prepare for your trip to Otaru in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Otaru, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Umbrellas/Raincoats: For rainy days

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Location coordinates Where is Otaru?

Get accurate weather forecasts for Otaru, located at latitude 43.189 and longitude 141.002. Stay updated with localized weather information tailored for Otaru.

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