Osaka Weather in September
Osaka in September sees very high daytime temperatures of 30°C (86°F) and nighttime lows of 21°C (70°F). Rainfall is fairly high this month at around 176 mm (6.9 in), so pack a rain jacket to stay dry.
Rainfall in Osaka in September
Analyzing past climate data, one can expect approximately 18 days of rain, averaging 176 mm (6.9 in). Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Osaka in September
In September, Osaka gets very high temperatures, with highs of 30°C (86°F). Nights cool to around 21°C (70°F). The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. Nights remain mild at 21°C (70°F), making evenings a pleasant time to be outdoors.
Sunshine in Osaka in September
The area experiences a moderate amount of sunshine, with approximately 156 hours of sunlight expected. This means a decent mix of sun and overcast.If your ideal day consists of dry skies and pleasant temperatures, April, May, October and November typically offer the best circumstances for Osaka.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Osaka's climate page.
Osaka Temperature in September
Min Temperature
21°C (70°F)
Max Temperature
30°C (86°F)
Chance of Rain
58%
Precipitation
176 mm (6.9 in)
Rainy days
18 days
Humidity
67%
Sunshine
156 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Osaka typically drop from around 31°C (88°F) at the start of September to approximately 26°C (79°F) by the end. Nights are warm, with lows typically ranging from 19°C (66°F) to 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Osaka in September
Browse day-by-day weather records for Osaka spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Osaka historical weather extremes in September
Based on weather observations in Osaka between 1976 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 2, 1986, with a maximum of 36°C (97°F).
- The lowest daytime temperature in September was 17°C (63°F), recorded on September 29, 2008.
- Osaka registered its coldest September night on September 28, 1992, with temperatures dropping to 11°C (52°F).
Best Places in Japan in September
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Osaka in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Osaka in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Osaka's climate page.
Temperature Rainfall Sunshine Humidity
See the full Osaka climate overview or explore weather in Japan.
