September weather forecast
Nepal

September in Nepal marks the transition from the monsoon season to autumn, bringing a decline in temperatures and rainfall. In the capital city Kathmandu, located in the hilly mid-region, average temperatures typically range between 18°C (64.4°F) and 28°C (82.4°F). The lowland Terai regions see temperatures fluctuating between 25°C (77°F) and 35°C (95°F), while the high Himalayan regions experience temperatures from 10°C (50°F) to 20°C (68°F).

The city of Pokhara, renowned for its panoramic mountain vistas and placid lakes, experiences average temperatures between 20°C (68°F) and 30°C (86°F). September brings a substantial decrease in rainfall compared to the previous months, gradually improving the visibility of the Himalayan peaks.

The Terai plains begin to transition out of the tropical monsoon climate in September. The region still experiences high temperatures, but the humidity and frequency of rainfall see a significant reduction.

While September is characterized by a decrease in rainfall across Nepal compared to August, occasional showers can still occur, especially in the early part of the month. As the month progresses, the weather becomes more stable, making outdoor activities and transportation more predictable and manageable.

With the receding monsoon, high altitude trekking routes, including the Everest Base Camp and the Annapurna Circuit, become increasingly accessible, though trekkers should remain cautious of residual monsoon effects. The Chitwan National Park in the Terai region sees improved wildlife viewing conditions with the declining heat, humidity, and rainfall. The Kathmandu Valley starts to experience pleasant and drier weather, making it an ideal period for trekking and exploring the rich cultural heritage of the region.

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• Kathmandu - September »
  In Kathmandu, in September, during 15 rainfall days, 200mm (7.87") of precipitation is typically accumulated. The months with the least sunshine in Kathmandu are July and September, with an average of 4.4h of sunshine.
• Pokhara - September »
  In Pokhara, during September, the rain falls for 10 days and regularly aggregates up to 641mm (25.24") of precipitation. On the first day of September in Pokhara, sunrise is at 5:47 am and sunset at 6:30 pm.
• Biratnagar - September »
  July and September, with an average relative humidity of 74%, are the most humid months in Biratnagar. In Biratnagar, during September, the rain falls for 18.5 days and regularly aggregates up to 123mm (4.84") of precipitation.
• Bharatpur - September »
  On the first day of September in Bharatpur sunrise is at 5:46 am and sunset at 6:28 pm. In Bharatpur, in September, it is raining for 27.8 days, with typically 265mm (10.43") of accumulated precipitation.
• Janakpur - September »
  With an average relative humidity of 74%, September is the most humid month in Janakpur. On the first day of September in Janakpur sunrise is at 5:40 am and sunset at 6:21 pm.
• Bhaktapur - September »
  September in Bhaktapur brings the post-monsoon season, consisting of decreasing rainfall and humidity, paving the way for the upcoming autumn. On the first day of September in Bhaktapur, sunrise is at 5:42 am and sunset at 6:24 pm.
• Nepalgunj - September »
  On the first day of September in Nepalgunj, sunrise is at 5:57 am and sunset at 6:39 pm. Nepalgunj marks the start of September with an average high-temperature of a still hot 32.5°C (90.5°F), hinting at a slight fluctuation from August's 33°C (91.4°F).
• Birendranagar - September »
  On the last day of September, in Birendranagar, sunrise is at 6:11 am and sunset at 6:05 pm +0545. Upon the onset of September, Birendranagar witnesses an average high-temperature of a moderately hot 29.9°C (85.8°F), showing a close resemblance to the prior month.
• Itahari - September »
  In Itahari, during September, the rain falls for 18.5 days and regularly aggregates up to 123mm (4.84") of precipitation. The average heat index, which combines air temperature and relative humidity, in September is computed to be 45°C (113°F).
• Tulsipur - September »
  In September, the average heat index, which factors the actual air temperature with the relative humidity, is appraised at 46°C (114.8°F). In Tulsipur, during September, the rain falls for 14.5 days and regularly aggregates up to 73mm (2.87") of precipitation.