Weather in Otaru-shi for September 2026
Until now, September 2026 in Otaru-shi is cooler than usual, with temperatures averaging 20.2 °C, this is 3 °C below the typical seasonal average.
Expect cooler weather in the next days in Otaru-shi with the forecast suggesting a temperature of 20.3 °C, lower than the historical average.
In general, the average temperature in Otaru-shi at the beginning of September is 23.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.6 °C by the end of September.
Otaru-shi in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 97.4 mm.
Is September a good time to visit Otaru-shi? check out the best time to travel to Otaru-shi page.
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Otaru-shi Weather September
Temperatures trend during September in Otaru-shi
September weather in Otaru-shi day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Partly cloudy | 24° /16° | 1.3 mm | 4 | |
| 2 Sept. |  Patchy rain possible | 22° /15° | 3.9 mm | 4 | |
| 3 Sept. | Patchy rain possible | 23° /16° | 3.9 mm | 4 | |
| 4 Sept. |  Sunny | 24° /15° | 3.4 mm | 6 | |
| 5 Sept. | Patchy rain possible | 24° /15° | 1.4 mm | 6 | |
| 6 Sept. |  Moderate or heavy rain shower | 23° /17° | 5.9 mm | 5 | |
| 7 Sept. | Patchy rain possible | 22° /15° | 2 mm | 4 | |
| 8 Sept. | Sunny | 24° /15° | 0.2 mm | 5 | |
| 9 Sept. |  Cloudy | 23° /14° | 0.8 mm | 5 | |
| 10 Sept. | Light rain shower | 25° /16° | 0.8 mm | 6 | |
| 11 Sept. | Sunny | 21° /16° | 0 mm | 5.8 | |
| 12 Sept. | Sunny | 23° /17° | 1 mm | 5.9 | |
| 13 Sept. |  Overcast | 23° /17° | 0 mm | 5.1 | |
| 14 Sept. | Overcast | 23° /19° | 1.7 mm | 4.7 | |
| 15 Sept. | Overcast | 20° /16° | 0 mm | 5.1 | |
| 16 Sept. | Overcast | 20° /15° | 0 mm | 5 | |
| 17 Sept. | Overcast | 22° /16° | 0 mm | 6 | |
| 18 Sept. | Overcast | 19° /16° | 4.1 mm | 4 | |
| 19 Sept. | Overcast | 20° /16° | 0.2 mm | 5 | |
| 20 Sept. | Overcast | 20° /16° | 0.1 mm | 5 | |
| 21 Sept. | Overcast | 20° /17° | 2.7 mm | 4 | |
| 22 Sept. | Light rain shower | 19° /16° | 26.1 mm | 5 | |
| 23 Sept. | Patchy rain possible | 19° /15° | 1.5 mm | 4 | |
| 24 Sept. | Light rain shower | 15° /12° | 41.1 mm | 3 | |
| 25 Sept. | Patchy rain possible | 19° /11° | 3.8 mm | 5 | |
| 26 Sept. | Moderate rain at times | 21° /12° | 1.5 mm | 5 | |
| 27 Sept. | Patchy rain possible | 21° /12° | 0.8 mm | 5 | |
| 28 Sept. | Light rain shower | 20° /13° | 17.2 mm | 4 | |
| 29 Sept. | Patchy rain possible | 20° /11° | 1.4 mm | 5 | |
| 30 Sept. | Cloudy | 21° /11° | 0 mm | 5 | |
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Otaru-shi weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 24°/17° | 21°/13° | 14°/6° |
| Rainfall | 131 mm | 97 mm | 146 mm |
| Wind | 12.4 km/h | 15.7 km/h | 20 km/h |
| Humidity | 85% | 76% | 75% |
| Rainy days | 22 days | 18 days | 24 days |
| Dry days | 9 days | 12 days | 7 days |
Planning a trip to Otaru-shi? Discover the best time to visit
Otaru-shi in September - FAQ
What are the expected maximum and minimum temperatures in Otaru-shi during September?
How much rainfall should be expected in Otaru-shi during September?
What are the typical wind conditions in Otaru-shi during September?
September rainfall patterns in Otaru-shi
UV exposure in Otaru-shi during September
What to pack to Otaru-shi in September?
Mild & changeable · highs around 21 °C, frequent showers
As you prepare for your trip to Otaru-shi 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-shi, during September, is comfortable and enjoyable, regardless of the weather conditions.
🧥 Clothing
👟 Footwear
🎒 Accessories
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Where is Otaru-shi?Get accurate weather forecasts for Otaru-shi, located at latitude 43.189 and longitude 141.002. Stay updated with localized weather information tailored for Otaru-shi.