The best times to visit Lang Son for ideal weather are
October 8th to April 15th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Lang Son Travel Guide
Other Lang Son Travel Info
Weather in Lang Son
Average temperatures in Lang Son vary greatly. Considering humidity, temperatures feel hot for about half of the year and otherwise nice with a fair chance of precipitation about half of the year. The area is somewhat temperate — in the 45th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Lang Son, the hottest months are July, June, and then August. See average monthly temperatures below. The warmest time of year is generally early to mid July where highs are regularly around 91.3°F (32.9°C) with temperatures rarely dropping below 75.5°F (24.2°C) at night.
Lang Son Temperatures (Fahrenheit)
Lang Son Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Lang Son Perceived Temperature (F)
Lang Son Perceived Temperature (C)
Average Lang Son Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Lang Son are January, February, and then December. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early February. For example, on the week of February 5th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late July with an average of 4 days of significant precipitation the week of July 23rd.
When can you find snow in Lang Son? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Lang Son.
Snow on the Ground
The graph below shows the average snow on the ground in Lang Son (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Lang Son has some extremely humid months, and high humidity throughout the year. The least humid month is December (70.3% relative humidity), and the most humid month is August (81.5%).
Wind in Lang Son is usually extremely calm. The windiest month is January, followed by December and February. January’s average wind speed of around 4.8 knots (5.5 MPH or 8.9 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late January where average top sustained speeds reach 8.9 knots, which is considered a gentle breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Lang Son.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||4.8||Light breeze||8.3||Gentle breeze|
|Feb||3.9||Barely noticeable||7.4||Gentle breeze|
|Mar||3.7||Barely noticeable||7.2||Gentle breeze|
|Apr||3.5||Barely noticeable||6.8||Light breeze|
|May||3.1||Barely noticeable||6.3||Gentle breeze|
|Jun||2.5||Barely noticeable||5.8||Light breeze|
|Jul||2.4||Barely noticeable||5.6||Gentle breeze|
|Aug||2.1||Barely noticeable||5.4||Light breeze|
|Sep||2.7||Barely noticeable||6.1||Gentle breeze|
|Oct||3.1||Barely noticeable||6.6||Light breeze|
|Nov||3.6||Barely noticeable||7.4||Gentle breeze|
|Dec||4.1||Light breeze||7.7||Gentle breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Lang Son?
Our best data indicates this area is somewhat safe. As of Oct 07, 2019 there are travel warnings for Vietnam; exercise a high degree of caution. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Aug 22, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Lang Son, Vietnam is October, followed by January and June. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Lang Son in February. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Lang Son Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel warm. Highs range from 88.3°F (31.3°C) and 65.4°F (18.6°C) with warmer temperatures in the later months. Rain is somewhat common with 4 to 9 days of significant precipitation per month. Spring is the slowest for tourism, which makes it a good time for those looking for deals.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the most precipitation with 11 to 12 days of precipitation per month. June – August is the second busiest season for tourism in Lang Son, so lodging and other accommodations may cost slightly more.
Fall (September through November)
Fall daily highs range from 86.9°F (30.5°C) and 71.4°F (21.9°C), which will feel very nice given the humidity and wind. It rains or snows a significant amount: 4 to 8 days per month. Tourism is the busiest during these months due to the weather, so hotels may be higher priced.
Winter (December through February)
Weather is somewhat cool this time of year in Lang Son to be enjoyable for warm weather travelers. The average high during this season is between 70.3°F (21.3°C) and 59.1°F (15.1°C). On average, it rains or snows a smalll amount: 2 to 3 times per month. These times of year are fairly slow with tourists.