Kathmandu - Five-Day Weather ForecastKathmandu ClimateKathmandu has four seasons - spring, summer, autumn and winter. Spring is from March through May, and the summers from June to September are hot and dusty, although, heavy rains can be expected during this period. Autumn starts towards the end of September and remains till November. Kathmandu’s winter usually begins in December - the period is fairly chilly and lasts until February. The city’s climate is fairly mild and is perfect for holidaymakers.