Click on a day for an hourly weather forecast
The temperatures in Osaka in September are quite cold with temperatures between 9°C and 23°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Osaka. 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 Osaka in September 2025.
If you’re planning to visit Osaka in the near future, we highly recommend that you review the 14 day weather forecast for Osaka before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -1° / -12° | 11 | 1 | 23 | 159 mm | Awful | Osaka in January |
| February | 1° / -11° | 9 | 3 | 18 | 145 mm | Awful | Osaka in February |
| March | 7° / -6° | 10 | 10 | 11 | 185 mm | Awful | Osaka in March |
| April | 15° / 1° | 9 | 20 | 2 | 172 mm | Bad | Osaka in April |
| May | 22° / 8° | 8 | 23 | 0 | 188 mm | Ok | Osaka in May |
| June | 24° / 10° | 12 | 18 | 0 | 280 mm | Good | Osaka in June |
| July | 27° / 13° | 17 | 14 | 0 | 393 mm | Good | Osaka in July |
| August | 28° / 14° | 13 | 18 | 0 | 292 mm | Good | Osaka in August |
| September | 23° / 9° | 10 | 20 | 0 | 216 mm | Good | Osaka in September |
| October | 18° / 3° | 6 | 25 | 0 | 203 mm | Good | Osaka in October |
| November | 10° / -2° | 6 | 22 | 1 | 142 mm | Ok | Osaka in November |
| December | 3° / -7° | 10 | 7 | 16 | 170 mm | Awful | Osaka in December |