Verdict: Good month
Kathmandu Weather in September
September hits the sweet spot in Kathmandu — highs around 26°C (79°F), ideal for a full day on foot. It's also the wet side of the calendar: rain falls on about 29 days, so build flexibility into plans. Overall, September is a solid month to visit Kathmandu.
Average high
26°C / 79°F
Average low
19°C / 66°F
Rain days
~29
Precipitation
403 mm
What to pack for Kathmandu in September
- Summer clothes, plus one light layer for air-con and evenings
- Rain gear is non-negotiable — expect rain on roughly 29 days
- Quick-dry shoes — downpours are short but heavy
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Kathmandu: Jun (27°C / 81°F) · Coolest: Jan (17°C / 63°F) · Wettest: Jul (~31 rain days)
17°
5°
Jan
18°
6°
Feb
22°
11°
Mar
26°
14°
Apr
25°
16°
May
27°
19°
Jun
27°
20°
Jul
27°
20°
Aug
26°
19°
Sep
24°
15°
Oct
21°
10°
Nov
18°
6°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)