Ang Nam Ngum, Laos: Visitor Guide

About Ang Nam Ngum

Overview

A major reservoir on the Nam Ngum River in central Laos formed by the Nam Ngum Dam. It is a key hydropower facility and a prominent inland waterbody used for fishing and tourism.

What visitors find

An extensive lake with islands and shoreline resorts, boating and fishing activities, and several townships and communities that serve visitors and lake industries. The reservoir and its islands are frequented by local and regional tourists.

History

Formed when the Nam Ngum Dam was constructed in the early 1970s to provide hydroelectric power; the dam and reservoir reshaped local land use and created new lakeshore opportunities.

Location

Located to the northeast of Vientiane in Vientiane Province, the reservoir occupies a basin on the Nam Ngum River and stretches across the surrounding low hills.

Hydropower and recreation: Created by the Nam Ngum Dam, the reservoir is a major hydropower source and a focal point for lakeside recreation and fishing in central Laos.

What to See#

Dam and reservoir: The Nam Ngum Dam and its impounded reservoir, which formed the principal lake and shoreline now used for fisheries and lakeside resorts.

Tips for Visiting Ang Nam Ngum

Visit Ang Nam Ngum on a weekday if possible - the reservoir is a very popular weekend getaway from Vientiane and islands, floating restaurants and boat services get busy.
Take a boat trip to one of the reservoir's islands in late afternoon for calmer conditions and attractive sunset views; local operators based at the main piers can arrange half-day trips.

When to Go

Best Time to Visit Ang Nam Ngum

Best visited in the cool, dry months (November-February) for comfortable lakeside activities and easier road access.

Cool, dry season

November-February · 20-30°C

Pleasant temperatures and lower humidity make lakeside activities and sightseeing most comfortable.

Hot season

March-May · 28-35°C

Hotter conditions and lower reservoir levels in some years; plan water activities for cooler parts of the day.

Rainy season

May-October · 24-30°C

Reservoir and river levels are highest, expanding water-based recreation but making some roads and rural access more challenging.

Weather & Climate near Ang Nam Ngum

Climate

Ang Nam Ngum's climate is classified as Tropical Monsoon - Tropical Monsoon climate with hot summers (peaking in June) and warm winters (coldest in January). Temperatures range from 16°C to 32°C. Heavy rainfall (2605 mm/year), wettest in July with a pronounced dry season.

Air Quality: AQI 82 Moderate

Best Time to Visit

FebruaryDecemberJanuary

Temperature & Rainfall

Temperature Range

43°

Warmest Month

5°

Coldest Month

Monthly Conditions

Month	Comfort	Temp	Feels	Rain	Sky	Humidity	Wind	UV	Daylight
January	Ideal	16° - 27°	21°	2 mm	some cloud	65%	1.0 m/s	1.4 high	11.0h
February	Ideal	16° - 28°	22°	14 mm	mostly sunny	58%	1.4 m/s	1.6 very high	11.4h
March	Excellent	19° - 30°	25°	35 mm	some cloud	55%	1.3 m/s	1.7 very high	11.9h
April	Very Good	22° - 32°	27°	109 mm	partly cloudy	58%	1.2 m/s	2.0 very high	12.4h
May	Good	24° - 32°	30°	295 mm	overcast	70%	1.4 m/s	2.1 extreme	12.9h
June	Acceptable	25° - 32°	32°	442 mm	overcast	77%	1.5 m/s	2.0 very high	13.1h
July	Good	24° - 31°	31°	666 mm	overcast	80%	1.3 m/s	1.9 very high	13.0h
August	Good	24° - 31°	31°	543 mm	overcast	83%	1.3 m/s	1.9 very high	12.6h
September	Good	24° - 31°	30°	376 mm	overcast	81%	1.4 m/s	1.9 very high	12.1h
October	Very Good	22° - 30°	26°	93 mm	partly cloudy	76%	1.4 m/s	1.7 very high	11.6h
November	Ideal	19° - 28°	24°	26 mm	some cloud	71%	1.1 m/s	1.5 very high	11.2h
December	Ideal	16° - 26°	21°	4 mm	some cloud	69%	1.1 m/s	1.4 high	10.9h