Key Takeaways:

• Heavy rainfall forecast in Himalayan and hilly regions of Koshi, Bagmati, Gandaki and Lumbini
• Moderate rain or snowfall with lightning expected in Himalayan areas of Lumbini, Karnali and Sudurpashchim
• Kathmandu 28–30°C, Pokhara 30–32°C, both with 60% chance of rain; Terai cities may reach 34–36°C
• Monsoon trough positioned south of its normal location, influencing weather nationwide

KATHMANDU, SEPTEMBER 15 Heavy rainfall accompanied by thunderstorms and lightning is likely in parts of eastern, central and western Nepal on Tuesday, according to the Department of Hydrology and Meteorology. The department's 24-hour forecast said heavy rain is expected in the Himalayan and hilly regions of Koshi, Bagmati and Gandaki provinces, as well as in the hilly region of Lumbini Province and the Terai regions of Bagmati, Gandaki and Lumbini. Moderate rain or snowfall with thunder and lightning is expected at some places in the Himalayan regions of Koshi, Bagmati and Gandaki, and at a few places in Lumbini, Karnali and Sudurpashchim. Similar conditions are forecast in hilly areas nationwide, while the Terai regions of Bagmati, Gandaki, Lumbini, Madhesh, Koshi and Sudurpashchim may also see moderate rainfall. Generally cloudy conditions are expected across the country throughout the day and night. Tonight, heavy rainfall is likely at one or two places in the hilly and Terai regions of Koshi Province, with moderate rain or snowfall forecast in Himalayan areas and thunderstorms in several hilly and Terai regions. Kathmandu is forecast to receive moderate rain with thundershowers, with maximum temperatures of 28–30°C and a 60% chance of rain. Nighttime temperatures are expected to fall to 18–20°C. Pokhara is also likely to receive moderate rain with thundershowers during the day and night, with maximum temperatures of 30–32°C. The maximum temperature is likely to reach 34–36°C in Dhangadi, Nepalgunj, Bhairahawa and Simara, with light rain and thunderstorms expected at night in Dhangadi, Nepalgunj and Bhairahawa. The department said the entire country is currently under the influence of monsoon winds, with the monsoon low-pressure line located south of its normal position.