Weather in Osaka in September 2025
Average weather
Average temperature in Osaka in September
The expected average maximum temperature in September is +29°C with a maximum of +33°C and a minimum of +17°C.
The average maximum temperature goes down 12% by the end of the month, compared with the beginning of the month, from +30°C to +28°C.
Is Osaka warm or cold in September?
Osaka is typically warm in September.
Maximum temperatures go down compared to the previous month from +30°C to +26°C. The minimum temperature also goes down from +23°C to +18°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Osaka, here is the comparison with other months:
Climate in Osaka in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +30°C | +26°C | +20°C | ||||
| Min. temperature | ||||||
| +15°C | +8°C | 0°C | ||||
| Max. temperature | ||||||
| +37°C | +34°C | +30°C | ||||
| Rainfall | ||||||
| 147 mm | 200 mm | 139 mm | ||||
| Wind | ||||||
| 1 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 77% | 77% | 74% | ||||
| Air pressure | ||||||
| 1009 HPa | 1012 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 3 | 3 | 6 | ||||
| Cloudy days | ||||||
| 7 | 9 | 12 | ||||
| Rainy days | ||||||
| 22 | 18 | 13 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +30°C in the day, the average maximum temperature lowers to +26°C. Prepare for more rain. Average rainfall goes from 147 mm to 200 mm. Humidity levels don’t change as the month goes on, averaging around 77%. Winds are stronger in comparison to August, going up from 1 m/s to 2 m/s on average. The amount of sunny days stay about the same, averaging 3 sunny days during the month.
But maybe it is worth considering traveling in October as the weather gets better.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Osaka is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Osaka?
Climate Change over Years
The climate in Osaka in September has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+17°C) and the highest in 2023 (+20°C). The driest year was 1994 with only 846 mm of rainfall, and the wettest year was 1993 with 1901 mm.
FAQ
Is September a good time to visit Osaka?
Can you sunbathe in Osaka in September?
Is Osaka rainy in September?
Is it sunny in Osaka in September?
Other cities in Japan
Monthly weather in Osaka
Source of the data
For this page, we’ve looked at the typical weather in Osaka, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.