October to March is the most comfortable window, with daytime temperatures around 18–23°C and cooler, foggier mornings — ideal for temple visits and the Ganga Aarti without summer heat. Avoid April to mid-July if possible, when daytime temperatures commonly reach 35–41°C. Monsoon (July–September) brings heavy rain and a swollen, faster-moving Ganga, which makes bathing at the ghats unsafe for stretches of the season — though the Kanwar Mela draws large pilgrim crowds in July regardless.