Shimla is a year-round destination with markedly different seasonal characters. The peak summer season (April–June) brings the crowds — Indian domestic tourists escaping the plains heat, which is exactly why the British established the hill station in the first place. Accommodation is expensive and the Mall is crowded, but the weather is the best of the year: clear skies, temperatures around 15–25°C, and excellent visibility toward the high peaks.
The monsoon (July–September) brings heavy rain, mist, and occasionally dramatic thunderstorms. Landslides can disrupt road access, and the views disappear into cloud for weeks at a time. Not ideal for sightseeing, but the surrounding forests are at their greenest and the crowds thin considerably.
Autumn (October–November) is arguably the best time: the monsoon has cleared, visibility is excellent, the apple orchards around Shimla are in harvest, and the tourist crowds have retreated. Winter (December–February) brings snow, which is beautiful and draws Indian tourists specifically to see it, but temperatures drop to -10°C at night and some roads to outer hill areas close.