Click on a day for an hourly weather forecast
The temperatures in Otaru in August are comfortable with low of 16°C and and high up to 24°C.
You can expect rain for roughly half of the month of August in Otaru. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Otaru in August 2025.
If you’re planning to visit Otaru in the near future, we highly recommend that you review the 14 day weather forecast for Otaru before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -10° | 4 | 1 | 28 | 172 mm | Awful | Otaru in January |
| February | -2° / -10° | 4 | 1 | 25 | 134 mm | Awful | Otaru in February |
| March | 2° / -7° | 7 | 4 | 21 | 125 mm | Awful | Otaru in March |
| April | 8° / -1° | 8 | 15 | 7 | 100 mm | Awful | Otaru in April |
| May | 15° / 5° | 8 | 22 | 0 | 130 mm | Ok | Otaru in May |
| June | 19° / 9° | 8 | 22 | 0 | 161 mm | Ok | Otaru in June |
| July | 24° / 14° | 10 | 21 | 0 | 213 mm | Good | Otaru in July |
| August | 24° / 16° | 11 | 20 | 0 | 253 mm | Good | Otaru in August |
| September | 21° / 12° | 7 | 23 | 0 | 202 mm | Ok | Otaru in September |
| October | 14° / 6° | 8 | 22 | 1 | 149 mm | Ok | Otaru in October |
| November | 7° / -1° | 10 | 8 | 12 | 187 mm | Awful | Otaru in November |
| December | 0° / -7° | 6 | 2 | 26 | 207 mm | Awful | Otaru in December |