Weather and climate in Kathmandu, Bagmati, Nepal: monthly averages and best time for stargazing

Best for stargazingDec, Nov, JanMost clear, dark hours

Warmest monthMayAverage high 30°C

Coolest monthJanuaryAverage low 6°C

Wettest monthJuly280 mm on average

What the weather is like in Kathmandu

The warmest month in Kathmandu is May, with average highs of 30°C. The coolest is January, when nights average 6°C. About 1,084 mm of rain and snow falls in a typical year, most in July and least in November.

Skies are clearest in November (36% average cloud cover) and cloudiest in July (91%). Combining cloud with the length of truly dark nights, December, November, January offer the most clear, dark hours for stargazing.

Clear, dark hours per night

6.3 Jan

5.6 Feb

5.0 Mar

3.9 Apr

2.9 May

1.6 Jun

0.7 Jul

1.0 Aug

2.1 Sep

5.1 Oct

6.8 Nov

6.9 Dec

Hours of full astronomical darkness in mid-month, multiplied by the average share of clear sky. A rough guide to how much good observing time a typical night offers.

Monthly averages

Month	High	Low	Precipitation	Cloud cover	Humidity	Wind	Dark hours
January	16°C	6°C	10 mm	41%	46%	5 km/h	10.7 h
February	20°C	8°C	17 mm	45%	43%	6 km/h	10.1 h
March	24°C	12°C	21 mm	47%	37%	6 km/h	9.4 h
April	29°C	16°C	37 mm	54%	37%	7 km/h	8.5 h
May	30°C	19°C	89 mm	61%	49%	6 km/h	7.6 h
June	29°C	20°C	170 mm	77%	66%	6 km/h	7.0 h
July	26°C	20°C	280 mm	91%	85%	6 km/h	7.3 h
August	26°C	20°C	238 mm	88%	87%	5 km/h	8.1 h
September	25°C	19°C	169 mm	76%	86%	4 km/h	9.1 h
October	23°C	15°C	45 mm	48%	74%	4 km/h	9.9 h
November	20°C	11°C	3 mm	36%	62%	4 km/h	10.5 h
December	17°C	7°C	5 mm	37%	52%	4 km/h	10.8 h

Climate averages: NASA POWER, 2001–2025, for the grid area around 27.50, 85.63 (about 50 km across). High and low temperatures are estimated from the monthly mean and the average daily range. Hills, coasts and cities can differ from the area average. Sources and methods.