Otaru
September
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.
Otaru in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 89.5 mm.
Is September a good time to visit Otaru? check out the best time to travel to Otaru page.
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Temperatures
Rain 🌧️
More
13
Dry days
17
Rainy days
0
Snow days
21°/13°
Temperatures
14 km/h
Avg max wind
75 %
Avg humidity
Otaru in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2  23° | 3  24° | 4 25° | 5 25° | 6  22° | 7 22° |
| 8 24° | 9  24° | 10 25° | 11 24° | 12  23° | 13  24° | 14 20° |
| 15 20° | 16  22° | 17 22° | 18  23° | 19 22° | 20 18° | 21 16° |
| 22 18° | 23 18° | 24 19° | 25 20° | 26 21° | 27 21° | 28 19° |
| 29 20° | 30 21° |
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Temperatures trend during September in Otaru
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Partly cloudy | 24° /15° | 0 mm | 6 | |
| 2 Sept. | Patchy rain possible | 23° /15° | 1 mm | 5 | |
| 3 Sept. | Sunny | 24° /16° | 0.1 mm | 6 | |
| 4 Sept. | Light rain shower | 25° /15° | 1.4 mm | 6 | |
| 5 Sept. | Light rain shower | 25° /16° | 2.8 mm | 6 | |
| 6 Sept. | Moderate or heavy rain shower | 22° /17° | 11.8 mm | 5 | |
| 7 Sept. | Patchy rain possible | 22° /13° | 1.2 mm | 6 | |
| 8 Sept. | Sunny | 24° /13° | 0 mm | 7 | |
| 9 Sept. | Cloudy | 24° /15° | 0 mm | 6 | |
| 10 Sept. | Light rain shower | 25° /16° | 1.1 mm | 6 | |
| 11 Sept. | Cloudy | 24° /16° | 3.8 mm | 6 | |
| 12 Sept. | Moderate rain | 23° /15° | 3.6 mm | 5 | |
| 13 Sept. | Mist | 24° /13° | 1 mm | 5 | |
| 14 Sept. | Moderate rain | 20° /13° | 15 mm | 5 | |
| 15 Sept. | Sunny | 20° /13° | 10.6 mm | 5 | |
| 16 Sept. | Overcast | 22° /12° | 0 mm | 5 | |
| 17 Sept. | Overcast | 22° /14° | 0.9 mm | 5 | |
| 18 Sept. | Light drizzle | 23° /15° | 1.7 mm | 6 | |
| 19 Sept. | Patchy rain possible | 22° /14° | 0.3 mm | 5 | |
| 20 Sept. | Patchy rain possible | 18° /12° | 2.2 mm | 4 | |
| 21 Sept. | Patchy rain possible | 16° /10° | 0.5 mm | 4 | |
| 22 Sept. | Sunny | 18° /9° | 0.3 mm | 5 | |
| 23 Sept. | Light rain shower | 18° /10° | 0.6 mm | 4 | |
| 24 Sept. | Cloudy | 19° /9° | 0 mm | 5 | |
| 25 Sept. | Patchy rain possible | 20° /10° | 0.1 mm | 5 | |
| 26 Sept. | Moderate rain at times | 21° /12° | 1.8 mm | 5 | |
| 27 Sept. | Partly cloudy | 21° /12° | 0.8 mm | 6 | |
| 28 Sept. | Light rain shower | 19° /13° | 25.8 mm | 4 | |
| 29 Sept. | Patchy rain possible | 20° /11° | 1 mm | 5 | |
| 30 Sept. | 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?
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 ☀️
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