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Best fit: October to March
These months offer the best overall balance for this itinerary. October and November usually bring the clearest Himalayan views, while the cooler, drier winter months are particularly comfortable for Chitwan wildlife experiences and Kathmandu sightseeing. December–February can be cold in Nagarkot and Kathmandu, especially early and late in the day.
Also possible: April and September
April is good for Kathmandu, Pokhara and hill scenery, although Chitwan becomes quite hot. September, especially later in the month, can work as the monsoon starts retreating, but rain and cloud may still affect road journeys and mountain views.
Avoid / least suitable: May to August
May becomes hot in Chitwan, while June to August falls within Nepal’s main monsoon period. Rain, cloud cover and road conditions can affect sightseeing, transfers and Himalayan visibility; Pokhara receives particularly high summer rainfall.