Nepal Weather and Flood Information
Weather conditions play a major role in flood and landslide risk across Nepal.
Heavy rainfall can cause rivers to rise, weaken mountain slopes, trigger landslides and block roads. In high mountain regions, flood risk can also come from sudden upstream events involving ice, rock, debris or temporary natural dams.
Because these hazards can develop quickly, it is important to use official monitoring information rather than relying only on social media or old weather reports.
Check Official Nepal Weather Information
The Department of Hydrology and Meteorology is Nepal's official source for weather forecasts, river monitoring, flood bulletins and hydrological information.
DHM Official Website → Flood Monitoring → Weather & Flood Bulletins →What Should You Monitor During Flood Conditions?
🌧️ Heavy Rainfall
Long periods of rain or intense short-duration rainfall can rapidly increase runoff and river levels.
🌊 River Levels
Rising river levels can provide an early indication that flood conditions are becoming more dangerous downstream.
⛰️ Landslide Risk
Rain-soaked slopes can become unstable, particularly along mountain roads, steep valleys and previously damaged areas.
🧊 Upstream Hazards
High-altitude ice, rock or debris movement can sometimes block rivers and create sudden downstream flood risk.
Understanding Nepal Flood Monitoring Levels
Official river monitoring systems use warning and danger levels to help show when river conditions are becoming more serious.
The direction of the river level is also important. A river may be below the warning level but rising quickly, while another river may be above a warning level but already falling.
Below Warning Level
The monitored river remains below the official warning threshold. Continue watching trends if rainfall or upstream conditions are worsening.
Above Warning Level
River conditions require increased attention. People near the river should closely follow official guidance and local warnings.
Above Danger Level
The river has crossed a higher-risk threshold. Follow official emergency instructions and avoid exposed river areas.
Why Rising or Falling Matters
A single river-level number does not tell the complete story.
Official monitoring may also describe a station as rising, falling or steady.
- Rising: Water level is increasing.
- Falling: Water level is decreasing.
- Steady: Little change is currently being recorded.
A rapidly rising river deserves particular attention even if it has not yet crossed a warning threshold.
Weather Risk Around Flood-Affected Areas
| Area Type | Main Weather Risk | What to Watch |
|---|---|---|
| Rasuwa mountain corridor | Rain, debris movement and unstable slopes | River changes, landslides and road warnings |
| Trishuli River corridor | Downstream water-level changes | DHM river monitoring and local alerts |
| Mountain roads | Landslides and rockfall | Road closures and fresh slope damage |
| Low-lying riverbanks | Flooding | Rapidly rising water and evacuation notices |
| Areas near damaged bridges | Changing river flow and erosion | Police and road authority restrictions |
Why Rasuwa and Downstream Communities Need Continued Monitoring
The August 2026 disaster in Rasuwa showed that serious flood risk can originate upstream and move rapidly into Nepal.
After a major flood, debris may remain inside river channels and mountain slopes may be unstable. Additional rainfall can move this material again or create new blockages.
Communities along the Trishuli River corridor should therefore continue following official river information, especially when upstream conditions are uncertain.
Rainfall Can Create Secondary Hazards
Flooding is not the only danger during heavy rain.
Rainfall can also trigger:
- Landslides
- Rockfall
- Mud and debris flows
- Road blockages
- Bridge damage
- Riverbank erosion
- Flash flooding in smaller streams
Mountain roads may remain risky even after the rain itself has stopped.
What Is a Flood Forecast Bulletin?
A flood forecasting bulletin provides information about river and flood conditions for areas being monitored.
It may include information about current hydrological conditions, expected changes and areas that require attention.
Because these bulletins are updated, readers should always check the newest available version rather than relying on screenshots of older reports.
What Is a Special Weather Forecast?
During periods of unusual or potentially dangerous weather, DHM may publish special weather information in addition to regular forecasts.
These updates can be particularly useful when widespread heavy rainfall or other hazardous conditions are expected.
DHM Weather & Flood Information by Phone
Nepal's Department of Hydrology and Meteorology provides a toll-free number for extreme weather and flood information.
Press 1: Weather Forecasting
Press 2: Flood Early Warning
How to Check Weather Before Travelling
Before travelling through areas affected by flooding or landslides, check more than just a general weather app.
A safer approach is to check:
- The latest DHM weather forecast
- Flood-monitoring information
- Current rainfall conditions
- Road closure information
- Local police or government notices
- Recent landslide reports
A sunny period at your starting location does not guarantee that a mountain road or upstream catchment is safe.
Flood & Severe Weather Safety Tips
- Stay away from swollen rivers and fast-moving water.
- Never walk or drive through flowing floodwater.
- Move away from unstable riverbanks.
- Avoid stopping below steep, rain-soaked slopes.
- Do not ignore official road barriers.
- Keep emergency alerts and your phone active.
- Prepare for power or communication outages.
- Follow evacuation orders without unnecessary delay.
- Check on children, older people and people who may need assistance.
Do Not Rely Only on Social Media
Social media can be useful for seeing what people are reporting, but weather and disaster information spreads quickly and old posts are often reshared without context.
A video may be real but from a different location or an earlier flood.
For important safety decisions, verify information through official monitoring and trusted local authorities.
Why Weather Information on This Page Is Not Hard-Coded
Weather forecasts and river levels can become outdated within hours.
For that reason, NepalFloodNews.com does not permanently display one temperature, rainfall percentage or river level as though it will remain current.
Instead, this page directs readers toward official live resources that can provide the latest available conditions.
Frequently Asked Questions
Where can I check official Nepal weather forecasts?
Use the official Department of Hydrology and Meteorology website for Nepal weather forecasts and meteorological information.
Where can I check Nepal river levels?
DHM's Flood Monitoring service provides official hydrological monitoring information for river stations.
What does above warning level mean?
It means a monitored river has crossed an official warning threshold and conditions require closer attention.
What does above danger level mean?
It indicates a more serious river condition. People in exposed areas should follow official safety and evacuation instructions.
What is Nepal's flood information phone number?
DHM lists the toll-free number 1155 for extreme weather and flood information.
Can rain cause landslides after a flood?
Yes. Saturated or damaged mountain slopes may remain unstable and further rainfall can increase landslide, rockfall and debris-flow risk.