Executive Summary for Heavy Rainfall in Nepal
Nepal’s Weather Forecasting Division has forecast moderate to heavy rainfall accompanied by thunderstorms across several parts of the country on 17 September 2026. The monsoon low-pressure trough is currently positioned south of its average location, while generally cloudy conditions are expected across much of Nepal. The highest rainfall potential is expected in the hilly and Terai areas of Koshi Province, parts of Bagmati, and the hilly areas of Gandaki Province. Further rainfall and thunderstorms are forecast overnight across parts of Koshi, Bagmati, Gandaki, Lumbini, Karnali and Sudurpaschim provinces.
- Date of Event: 17 September 2026
- Location: Nepal
- Risk Category: Environment
- Severity Score: 3/5
- Confidence Level: 78%
What is Risk Analysis in the Context of Environment Events
Environmental risk analysis assesses the potential effects of intense precipitation on road and air travel, localized flooding, landslides, infrastructure and business operations. Mountainous and hilly areas can face additional disruption from rainfall-induced landslides and difficult road conditions.
Known Hotspots and Sensitive Areas
High Impact
- Koshi Province: Hilly and Terai areas face potential heavy rainfall and thunderstorms.
- Bagmati Province: Heavy rainfall is possible in parts of the Terai, with further moderate to heavy rainfall expected in mountainous areas.
- Gandaki Province: Hilly areas are expected to experience heavy rainfall, with further rainfall possible in mountainous areas.
Medium Impact
- Lumbini Province: Rainfall and thunderstorms are expected across parts of the hilly and mountainous areas.
- Karnali and Sudurpaschim: Rainfall is possible in mountainous and hilly areas, particularly overnight.
Low Impact
- Areas of Nepal where only light or moderate rainfall is forecast are expected to face comparatively lower disruption.
Impact on Transportation and Services
Heavy rainfall and thunderstorms may affect road conditions, particularly across hilly and mountainous areas, where reduced visibility, water accumulation and rainfall-related hazards can slow travel. The widespread nature of the forecast also creates potential for localized disruption to outdoor activities and ground operations.
Recommended Actions
- Monitor local weather updates before travelling through affected areas.
- Allow additional journey time on hilly and mountainous roads.
- Exercise caution when travelling through areas experiencing heavy rainfall or thunderstorms.
- Businesses with outdoor operations should monitor changing weather conditions.
- Follow instructions from local authorities if flooding or landslide warnings are issued.
Emergency Contacts
- Police: 100
- Fire Services: 101
- Ambulance: 102
Final Thoughts
The forecast represents a moderate environmental risk, with heavy rainfall and thunderstorms expected across multiple provinces. Koshi, Bagmati and Gandaki are at higher risk as heavier rainfall is forecast and mountainous terrain may increase the potential for travel disruption. Leveraging MitKat’s Datasurfr enables businesses to receive real-time intelligence, monitor evolving threats and make informed decisions to protect people, assets and operations.