Osaka Weather in September
Japan · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Osaka sees average temperatures ranging from a low of 22.5°C (72.5°F) to a high of 30.1°C (86.2°F), with a mean of 25.9°C (78.6°F). Compared to the annual average of 16.5°C (61.7°F), this month is 9.4°C warmer than the yearly norm. Precipitation averages 190.0mm, making it approximately 37.0mm wetter than the monthly average of 153.0mm. The city receives an average of 9.2 hours of sunshine per day during September, with relative humidity averaging 75.7%. Wind speeds reach an average maximum of 21.2 km/h. For travelers, this month offers a temperature experience in Osaka, with wetter-than-average conditions compared to the rest of the year.
Osaka's climate is similar to Tokyo but with a more pronounced urban heat effect. I visited during the humid summer and found the city's famous street food culture actually thrives in the heat — the covered arcades of Dotonbori provide perfect shelter from the sun. The data shows Osaka gets slightly warmer than Tokyo in summer, making air conditioning essential. Spring and autumn are the ideal windows for exploring the city's many temples and castles.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 29.0°C (84.2°F) | 25.9°C (78.6°F) | 18.5°C (65.3°F) |
| Rainfall | 187.8mm | 190.0mm | 162.7mm |
| Sunshine | 10.4 hrs | 9.2 hrs | 8.3 hrs |
| Humidity | 74.5% | 75.7% | 75.9% |
| Wind | 24.1 km/h | 21.2 km/h | 20.4 km/h |
| Rainy Days | 19.8 | 19.2 | 12.8 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Osaka in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Osaka in September?
The average temperature in Osaka during September ranges from 22.5°C (72.5°F) to 30.1°C (86.2°F), with a mean of 25.9°C (78.6°F).
How much does it rain in Osaka in September?
Osaka receives an average of 190.0mm of precipitation in September, spread across approximately 19.2 rainy days.
What should I pack for Osaka in September?
Based on September weather data, pack lightweight, breathable clothing, sunscreen, and a hat. Rain gear is essential — this month averages 190.0mm of precipitation.
Is September a good time to visit Osaka?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Osaka
Cities with Similar September Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 34.69°, 135.5°. Timezone: Asia/Tokyo. Last updated: 2026-07-30.