Monthly climate guide
Osaka weather in September
With highs near 27°C (80°F) and lows around 19°C (65°F), September feels warm in Osaka. Rainfall averages about 265 mm (very wet) and the sky is often cloudy. Daytime highs are 4°C cooler than August and 5°C warmer than October.
What stands out in September
- Keep a flexible plan: if showers roll in, shift Kuromon Ichiba Market to a drier part of the day.
- Seasonally, September counts as early autumn in Osaka.
- It's humid — around 84% — so the heat feels heavier.
- September is Osaka's third warmest month.
It's usually the wettest month of the year.
Avg high
27°C
80°F
Avg low
19°C
65°F
Rainfall
265 mm
very wet
Humidity
84%
relative
Sky
69%
cloud · often cloudy
Osaka weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 7°C / 44°F | -1°C / 31°F | 59 mm | 83% | 66% |
| February | 8°C / 47°F | 0°C / 31°F | 75 mm | 81% | 67% |
| March | 12°C / 54°F | 2°C / 36°F | 108 mm | 79% | 61% |
| April | 18°C / 64°F | 7°C / 44°F | 147 mm | 78% | 61% |
| May | 23°C / 73°F | 12°C / 54°F | 142 mm | 78% | 63% |
| June | 25°C / 78°F | 17°C / 62°F | 237 mm | 83% | 79% |
| July | 29°C / 84°F | 22°C / 71°F | 243 mm | 85% | 74% |
| August | 30°C / 87°F | 23°C / 73°F | 190 mm | 83% | 62% |
| September | 27°C / 80°F | 19°C / 65°F | 265 mm | 84% | 69% |
| October | 21°C / 70°F | 12°C / 54°F | 208 mm | 84% | 61% |
| November | 16°C / 60°F | 7°C / 44°F | 84 mm | 83% | 58% |
| December | 9°C / 49°F | 1°C / 34°F | 72 mm | 83% | 65% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is September a good time to visit Osaka?
Our Osaka guide recommends: March to May or October to November, avoiding the hot, humid summer.
Osaka is widely considered Japan's best city for street food — look for takoyaki and okonomiyaki at casual stalls in Dotonbori.
Best time to visit Osaka →Other Japan cities in September
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Osaka weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/japan/osaka/september
<a href="https://weathercompare.eu/weather/japan/osaka/september">Osaka weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/japan/osaka" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Osaka weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/japan/osaka/september">Osaka weather in September</a> – WeatherCompare</p>
Osaka in September: quick answers
Is September a good time to visit Osaka?
September is one of the wetter months in Osaka, with about 265 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Osaka in September?
Average highs are about 27°C (80°F) and average lows about 19°C (65°F), based on 10 years of daily data.
Does it rain a lot in Osaka in September?
Osaka typically gets around 265 mm of rain in September — very wet. It's usually the wettest month of the year.
When is the best time to visit Osaka?
March to May or October to November, avoiding the hot, humid summer.
Figures are long-term averages for the area around Osaka (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.