Click on a day for an hourly weather forecast
The weather in Sasebo in September is hot. The average temperatures are between 22°C and 27°C.
You can expect rain for roughly half of the month of September in Sasebo. 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 Sasebo in September 2025.
If you’re planning to visit Sasebo in the near future, we highly recommend that you review the 14 day weather forecast for Sasebo before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 10° / 5° | 8 | 19 | 4 | 84 mm | Awful | Sasebo in January |
| February | 11° / 6° | 7 | 19 | 2 | 111 mm | Awful | Sasebo in February |
| March | 14° / 9° | 7 | 23 | 0 | 121 mm | Ok | Sasebo in March |
| April | 18° / 12° | 7 | 23 | 0 | 140 mm | Ok | Sasebo in April |
| May | 22° / 16° | 7 | 24 | 0 | 145 mm | Ok | Sasebo in May |
| June | 25° / 20° | 10 | 20 | 0 | 297 mm | Good | Sasebo in June |
| July | 28° / 24° | 12 | 19 | 0 | 368 mm | Good | Sasebo in July |
| August | 30° / 25° | 11 | 20 | 0 | 335 mm | Ok | Sasebo in August |
| September | 27° / 22° | 8 | 22 | 0 | 198 mm | Good | Sasebo in September |
| October | 23° / 17° | 4 | 27 | 0 | 104 mm | Perfect | Sasebo in October |
| November | 17° / 13° | 5 | 25 | 0 | 126 mm | Good | Sasebo in November |
| December | 12° / 7° | 7 | 22 | 2 | 109 mm | Awful | Sasebo in December |