Heavy rain forecast for five provinces on 26 September 2026

The Weather Forecasting Division's outlook for 26 September 2026 puts Koshi, Bagmati and Gandaki in line for heavy rain at a few locations, with Madhesh and Lumbini expecting it at one or two. Isolated spots in the hills of Koshi and Bagmati could get very heavy falls. The division also warns of windstorms at a few locations in Madhesh and in Koshi's Tarai belt. Cloud cover is forecast to be extensive over Koshi, Madhesh, Bagmati, Gandaki and Lumbini, and general over Karnali and Sudurpashchim. Thunder, lightning and moderate showers are expected at many spots in the mountains and hills of Koshi, Bagmati, Gandaki and Lumbini, and at fewer spots in the high and hill areas of Karnali and Sudurpashchim. Similar conditions are forecast for the plains: moderate showers with thunder and lightning at many locations across Madhesh and the Tarai of Koshi, Bagmati, Gandaki and Lumbini, and at some locations in Sudurpashchim's Tarai. The department's analysis says monsoon winds are influencing the whole country, with westerlies adding a partial effect. Over the Bay of Bengal, the low-pressure area has become a deep depression positioned over the west-central bay and the neighbouring northwestern part; forecasters expect it to intensify further over the coming days while tracking west-northwestward.