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Weather in Otaru for September 2025

Your guide to Otaru weather in September - trends and predictions

    Temperatures

  • The forecast for the next days in Otaru predicts temperatures to be around 24 °C, close to the historical average.

  • In general, the average temperature in Otaru at the beginning of September is 24.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.1 °C by the end of September.

    • Rain 🌧️

  • Otaru in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 89.5 mm.

    • More

  • 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
13
Dry days
Average rainy days
17
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/13°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Otaru Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Partly cloudy
25°
2
Patchy rain possible
23°
3
Sunny
24°
4
Sunny
25°
5
Sunny
25°
6
Sunny
25°
7
Patchy rain possible
24°
8
Patchy rain possible
25°
9
Patchy rain possible
22°
10
Sunny
22°
11
Sunny
24°
12
Sunny
23°
13
Partly cloudy
24°
14
Patchy rain possible
25°
15
Patchy rain possible
23°
16
Patchy rain possible
23°
17
Overcast
22°
18
Light drizzle
23°
19
Patchy rain possible
22°
20
Patchy rain possible
18°
21
Patchy rain possible
16°
22
Sunny
18°
23
Light rain shower
18°
24
Cloudy
19°
25
Patchy rain possible
20°
26
Moderate rain at times
21°
27
Partly cloudy
21°
28
Light rain shower
19°
29
Patchy rain possible
20°
30
Cloudy
21°

Temperatures trend during September in Otaru

See the weather trend as well as the moving average line

September weather in Otaru day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 25° /16° 1.6 mm 6
2 Sept. Patchy rain possible
Patchy rain possible
 23° /15° 2.7 mm 5
3 Sept. Sunny
Sunny
 24° /16° 0.1 mm 6
4 Sept. Sunny
Sunny
 25° /16° 0 mm 1.5
5 Sept. Sunny
Sunny
 25° /16° 0.1 mm 1.6
6 Sept. Sunny
Sunny
 25° /16° 0 mm 1.5
7 Sept. Patchy rain possible
Patchy rain possible
 24° /20° 1.4 mm 0.7
8 Sept. Patchy rain possible
Patchy rain possible
 25° /18° 0.2 mm 5
9 Sept. Patchy rain possible
Patchy rain possible
 22° /16° 0 mm 4
10 Sept. Sunny
Sunny
 22° /13° 0 mm 5
11 Sept. Sunny
Sunny
 24° /14° 0 mm 5
12 Sept. Sunny
Sunny
 23° /14° 0 mm 5
13 Sept. Partly cloudy
Partly cloudy
 24° /15° 0 mm 5
14 Sept. Patchy rain possible
Patchy rain possible
 25° /15° 0.1 mm 4
15 Sept. Patchy rain possible
Patchy rain possible
 23° /18° 1.7 mm 5
16 Sept. Patchy rain possible
Patchy rain possible
 23° /16° 1.2 mm 4
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
Next
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.
Change Month
‹
›

Otaru weather in September vs August vs October

Compare September weather in Otaru with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures25°/17°21°/13°14°/7°
Rainfall154 mm90 mm180 mm
Wind11.5 km/h14.5 km/h19.7 km/h
Humidity86%75%75%
Rainy days19 days17 days21 days
Dry days12 days13 days10 days

Planning a trip to Otaru? Discover the best time to visit

Otaru in September - FAQ

What are the expected maximum and minimum temperatures in Otaru during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Otaru during September?
Moderate rainfall is anticipated in Otaru during September, with a total of 89.5 mm spread over approximately 17 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Otaru during September?
The average wind speed in Otaru during September is 14 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
    • Warm Clothing: Sweaters, hoodies, long 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
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather
    • Umbrellas/Raincoats: For rainy days

September rainfall patterns in Otaru

Explore the daily rainfall trends and prepare for Otarus September weather 💧

UV exposure in Otaru during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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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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