What September feels like in Osaka
Early autumn arrives in Osaka with September. Afternoons are hot, so sightseeing works best in the morning or evening. Little changes after sunset — nights stay warm, only slightly below the daytime level. High humidity makes the heat feel heavier and sticky, especially on still afternoons.
Rain in Osaka in September
Dry days are the exception, with rain on about one day in 2. When rain comes it is heavy, about 14.6 mm (0.6 in) per wet day, often in short, strong bursts. The yearly figure is similar, around 12.7 mm per wet day. It is among the three wettest months of the year.
Daylight and sunshine in September
On 15 September the sun rises at about 5:40 am and sets around 6:07 pm local time, giving 12 h 27 min of daylight. Evenings are drawing in — 1 h 3 min less daylight than mid-August. The sun is out for roughly 71% of those daylight hours, so there are plenty of bright spells.
How September compares to the rest of the year
In Osaka's temperature order, September sits as the 3rd warmest month. Against August, the average high is 3.7°C (6.7°F) lower, with 54 mm more rain. The cooling trend carries on into October. By October, typical highs are 22.6°C (72.7°F).
Who September suits
- Sightseeing: a good fit — the weather rarely gets in the way of a city walk.
- Parks & outdoor: less ideal — afternoons are too warm to linger outside.
- Beach: less ideal — too many rainy days.
Tips for visiting Osaka in September
Rain Protection
Keep a small umbrella in your bag and wear shoes that cope with puddles.
Sun Protection
Protect yourself from strong sun: hat, SPF and plenty of water.
Quick questions
How warm is Osaka in September?
Afternoons average 28.6°C (83.5°F) and nights about 21.3°C (70.3°F) — hot by most people's standards. It is the 3rd warmest month of the year.
Does it rain a lot in Osaka in September?
Yes, fairly — rain falls about one day in 2 and totals about 189 mm, so an umbrella is worth carrying.
What should I wear in Osaka in September?
Pack rain protection and sun protection. Evenings feel similar to the day, so the same clothes work from morning to night.
Is September or October better for visiting Osaka?
October scores better on our climate ranking (#1 of 12 vs #6), rated Great against Good. October is cooler and has fewer rainy days.