Osaka weather in September
In September, Osaka has an average high of 28 °C82 °F and an average low of 20 °C68 °F, with about 225 mm8.8 in of precipitation. It is the 3rd warmest month of the year and the wettest.
How September compares with other months
Compared with August, September is 3.6 °C6.5 °F cooler on average and wetter by 47 mm1.8 in. Compared with October, September is 6 °C10.7 °F warmer on average and wetter by 33 mm1.3 in. Daylight lasts about 12.3 hours around the middle of the month. Average relative humidity is 84% and the average cloud amount 68%.
Is September a good time to visit Osaka?
September is not among the most comfortable months by our comfort score: it is hot (average high 28 °C82 °F), it is fairly wet (225 mm8.8 in) and it is humid (84%). The most comfortable months in Osaka are April and May and November.
What to wear in September
For Osaka in September, pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
September in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Osaka | 2882 | 2068 | 2258.8 |
| Hirakata | 2781 | 2067 | 1927.6 |
| Kobe | 2781 | 2271 | 1947.7 |
| Sandachō | 2680 | 1865 | 1877.4 |
| Kyoto | 2781 | 1967 | 1927.6 |
| Kusatsu | 2780 | 1966 | 2088.2 |
| Minato | 2781 | 2374 | 2389.4 |
| Himeji | 2781 | 1966 | 1877.4 |
| Hikone | 2680 | 1967 | 2027.9 |
Nearby places that are more than 1 °C1.8 °F warmer in September: Minato; cooler: Sandachō, Kusatsu and Hikone.
Other months in Osaka
- January8 °C47 °F / 1 °C33 °F
- February10 °C50 °F / 1 °C34 °F
- March14 °C57 °F / 3 °C38 °F
- April19 °C67 °F / 8 °C47 °F
- May24 °C75 °F / 14 °C56 °F
- June27 °C81 °F / 18 °C65 °F
- July30 °C87 °F / 23 °C74 °F
- August31 °C89 °F / 24 °C75 °F
- September28 °C82 °F / 20 °C68 °F
- October22 °C72 °F / 14 °C57 °F
- November17 °C62 °F / 8 °C46 °F
- December11 °C51 °F / 3 °C37 °F
Frequently asked questions
How warm is Osaka in September?
In September the average high in Osaka is 28 °C (82 °F) and the average low is 20 °C (68 °F).
Does it rain a lot in Osaka in September?
On average about 225 mm (8.8 in) of precipitation falls in September; it ranks 1st of the 12 months.
Is September the warmest month in Osaka?
No. The warmest month in Osaka is August, with an average high of 31 °C (89 °F). The coldest month is January, with an average low of 1 °C (33 °F).
How long is the day in Osaka in September?
In the middle of September the day in Osaka lasts about 12.3 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Osaka in September?
The average relative humidity in September is about 84%. Combined with warm days, it can feel muggy.
How cloudy is Osaka in September?
On average about 68% of the sky is covered by cloud in September. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 264 m, while Osaka lies at about 4 m. Temperatures on this page were therefore adjusted by +1.7 °C3 °F using the standard lapse rate of 6.5 °C per 1,000 m.