Early autumn · Weather & things to do
Osaka in September
The year's rain peaks now, with about 8.9 in (225 mm) falling in Osaka, alongside highs near 82°F (28°C) and lows of 68°F (20°C).
Our comfort score puts it mid-table at 51/100, 10th of 12.
- Avg high
- 82°F (28°C)
- Avg low
- 68°F (20°C)
- Rain
- 8.9 in (225 mm)
- Humidity
- 84%
- Cloud cover
- 68%
- Daylight
- ~12 h 12 min
- Comfort score
- 51/100 · Fair
What September feels like
Highs settle around 82°F (28°C), warm enough for short sleeves.
Nights cool to an average low of 68°F (20°C).
Humidity averages 84%, so the air feels sticky and the heat feels stronger than the thermometer says.
Rain is a real factor, with about 8.9 in (225 mm) across the month.
Plan around September
September sits mid-table; the best months are April and November.
- Inside the wettest three-month stretch, July – September.
- Comfort improves from 45/100 in August to 51/100.
- Our Japan Golden Route recommends Mar – May, so September falls outside its suggested window.
What to pack for September
- Light, breathable clotheshighs average 82°F
- Quick-dry fabrics84% average humidity
- Rain jacket and waterproof shoesfrequent rain
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Osaka in September
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
Osaka Castle
Reconstructed castle keep with a history museum and moat-ringed park.
Why now An indoor-leaning stop for a month with 8.9 in of rain.
Kushikatsu Daruma Shinsekai
Original 1929 shop for deep-fried skewers; no double-dipping in the shared sauce.
Why now A sit-down stop to wait out showers in a month with 8.9 in of rain.
Osaka Aquarium Kaiyukan
Huge aquarium built around a central Pacific tank with whale sharks.
Why now A good rainy-day backup in September.
Kuromon Ichiba Market
Covered market with grilled scallops, wagyu skewers, sea urchin and fruit stalls.
Why now Easy to slot in when September's rain moves in.
Suntory Yamazaki Distillery
Japan's first malt whisky distillery, 40 minutes away by train in Shimamoto.
Why now Keeps part of the day dry on wetter September days.
Nearby in September
- Kyoto in September~27 mi · highs 81°F, 7.6 in rain · similar daytime temperatures, drier
- Tokyo in September~244 mi · highs 81°F, 8.5 in rain · similar daytime temperatures, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~264 m to Osaka's ~23 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Osaka in September: quick answers
Is September a good time to visit Osaka?
It's middling, scoring 51/100. The best months are April and November, at up to 79. Expect highs of 82°F (28°C) and 8.9 in (225 mm) of rain. Our Japan Golden Route recommends Mar – May, so September is outside its suggested window.
How hot is Osaka in September?
Average highs are 82°F (28°C) and average lows 68°F (20°C), making it the 3rd-warmest month by daytime highs.
Does it rain a lot in Osaka in September?
Yes: about 8.9 in (225 mm) of rain falls across September on average, the wettest month of the year. The annual total is about 69.0 in (1753 mm).
What should I pack for Osaka in September?
Bring light, breathable clothes (highs average 82°F), quick-dry fabrics (84% average humidity), rain jacket and waterproof shoes (frequent rain) and comfortable walking shoes (most places below are best reached on foot or with short walks).
Planning Osaka in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.