Verdict: Good month
Osaka Weather in September
September runs warm in Osaka, with daily highs around 30°C (86°F) and nights near 23°C (73°F). Expect showers on roughly 14 days of the month — rarely trip-ruining, worth planning around. Overall, September is a solid month to visit Osaka.
Average high
30°C / 86°F
Average low
23°C / 73°F
Rain days
~14
Precipitation
190 mm
What to pack for Osaka in September
- Light, breathable clothing — linen and technical fabrics earn their keep
- High-SPF sunscreen, sunglasses, and a refillable water bottle
- Rain gear is non-negotiable — expect rain on roughly 14 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Osaka: Aug (33°C / 91°F) · Coolest: Jan (9°C / 48°F) · Wettest: Jul (~17 rain days)
9°
1°
Jan
11°
2°
Feb
15°
5°
Mar
19°
10°
Apr
23°
14°
May
27°
19°
Jun
31°
24°
Jul
33°
26°
Aug
30°
23°
Sep
23°
14°
Oct
18°
9°
Nov
11°
3°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)