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.
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.
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12
Dry days
18
Rainy days
0
Snow days
22°/15°
Temperatures
13 km/h
Avg max wind
78 %
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?
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
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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