Verdict: Good month
Hakone Weather in September
September runs warm in Hakone, with daily highs around 27°C (81°F) and nights near 22°C (72°F). It's also the wet side of the calendar: rain falls on about 15 days, so build flexibility into plans. Overall, September is a solid month to visit Hakone.
Average high
27°C / 81°F
Average low
22°C / 72°F
Rain days
~15
Precipitation
207 mm
What to pack for Hakone in September
- Summer clothes, plus one light layer for air-con and evenings
- 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
September against the rest of the year
Warmest in Hakone: Aug (30°C / 86°F) · Coolest: Jan (10°C / 50°F) · Wettest: Jul (~17 rain days)
10°
3°
Jan
11°
3°
Feb
14°
7°
Mar
18°
11°
Apr
21°
15°
May
24°
19°
Jun
28°
23°
Jul
30°
24°
Aug
27°
22°
Sep
21°
16°
Oct
17°
11°
Nov
12°
5°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)