Osaka weather in September
September is a fair month to visit Osaka: highs of 26°C (79°F) and about 225 mm (8.9 in) of rain on average. Nights average 18°C (65°F) and cloud cover 68% (NASA POWER, 2001–2025 averages). The sea averages 29°C (85°F). It is the wettest month of the year and the 3rd warmest. Compared with August, it is cooler and wetter; October brings highs of 21°C (69°F) and 192 mm (7.6 in) of rain.
Is September a good time to visit Osaka?
fair month Weather score 49/100.
September is a fair month in Osaka. The weather is usually best in Apr–May, Aug, Oct–Nov.
Does it rain a lot in Osaka in September?
Yes, it is one of the rainy months: about 225 mm (8.9 in) falls in an average September. It is the wettest month of the year.
How warm is Osaka in September?
Days average 26°C (79°F) and nights 18°C (65°F).
Osaka weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 6°C (44°F) | -1°C (30°F) | 66 mm | 70% | 9°C (49°F) | least pleasant |
| February | 8°C (47°F) | -1°C (31°F) | 80 mm | 69% | 9°C (47°F) | least pleasant |
| March | 12°C (53°F) | 2°C (35°F) | 116 mm | 65% | 10°C (50°F) | fair |
| April | 18°C (64°F) | 7°C (44°F) | 135 mm | 64% | 15°C (60°F) | best |
| May | 22°C (72°F) | 12°C (53°F) | 159 mm | 67% | 19°C (67°F) | best |
| June | 25°C (78°F) | 17°C (62°F) | 213 mm | 79% | 24°C (74°F) | fair |
| July | 29°C (84°F) | 21°C (71°F) | 220 mm | 73% | 30°C (85°F) | fair |
| August | 30°C (86°F) | 22°C (71°F) | 178 mm | 62% | 30°C (87°F) | best |
| September | 26°C (79°F) | 18°C (65°F) | 225 mm | 68% | 29°C (85°F) | fair |
| October | 21°C (69°F) | 12°C (53°F) | 192 mm | 63% | 24°C (75°F) | best |
| November | 15°C (59°F) | 6°C (43°F) | 93 mm | 60% | 18°C (65°F) | best |
| December | 9°C (48°F) | 1°C (34°F) | 76 mm | 65% | 13°C (55°F) | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months