What September feels like in Kathmandu
September is early autumn in Kathmandu. Warm daytime weather invites long lunches outside and evening strolls. There is little difference between day and night: nights stay warm, and evenings feel much like the afternoon. The air is muggy, so it feels hotter than the thermometer suggests.
Rain in Kathmandu in September
September is persistently wet here: some rain falls on most days. When rain comes it is heavy, about 14.1 mm (0.6 in) per wet day, often in short, strong bursts. Across the year Kathmandu averages about 15.1 mm per rainy day, so September is typical.
Daylight and sunshine in September
In mid-September, sunrise is at about 5:48 am and sunset at about 6:10 pm (local time) — 12 h 22 min of daylight. Days are getting shorter: 48 min less daylight than in mid-August. Measured sunshine covers about 69% of the daylight — there are plenty of bright spells.
How September compares to the rest of the year
September is the 5th warmest month of the year in Kathmandu. Afternoons run 0.5°C (0.9°F) cooler than in August, with 264 mm less rain. Temperatures keep falling into October. The next month's average high: 23.2°C (73.8°F).
Who September suits
- Sightseeing: less ideal — rain falls on more than half the days.
- Parks & outdoor: less ideal — rain interrupts outdoor plans.
- Hiking: less ideal — wet trails.
- Museums & indoor: a good choice — with rain on most days, galleries and museums make easy plans.
Tips for visiting Kathmandu in September
Rain Protection
A compact umbrella and a light waterproof jacket.
Sunglasses
Plenty of sun, so bring sunglasses and a cap.
Quick questions
How warm is Kathmandu in September?
It feels warm: typical highs are 25.4°C (77.7°F), with lows near 19°C (66.2°F).
Does it rain a lot in Kathmandu in September?
It does: about 29 rainy days bring roughly 408 mm, so plan some indoor options.
What should I wear in Kathmandu in September?
Based on the averages: rain protection and sunglasses. There is little need to change for the evening.
Is September or October better for visiting Kathmandu?
On our 12-month climate ranking, October comes out ahead (#7 of 12 vs #10). October is cooler and has fewer rainy days.