Verdict: Fair month
Osaka Weather in August
August is seriously hot in Osaka — days average 33°C (91°F), so plan mornings out and afternoons in the shade or the water. It's also the wet side of the calendar: rain falls on about 15 days, so build flexibility into plans. August is workable in Osaka if your dates are fixed — just plan around the conditions.
Average high
33°C / 91°F
Average low
26°C / 79°F
Rain days
~15
Precipitation
188 mm
What to pack for Osaka in August
- 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 15 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
August 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)