Winters here (mid-November to mid-March) are not extremely cold but have an average temperature ranging anywhere from 8 – 15 degrees Celsius. It’s important to know what the weather will be like in advance of your tour so that you can be the best prepared and have the most enjoyable experience.
Check weather conditions carefully via
http://www.accuweather.com/en/vn/phong-nha/418626/weather-forecast/418626 at least 7 days in advance so that you can foresee if you want to do the tour in the forecasted weather or not (refunds are only given when a written cancellation request is received and acknowledged 7 days in advance of a tour).
Bring warm and thermal clothes. You can even bring a thermal rash guard or springsuit (short wetsuit) for a Tu Lan tour if you would really like. If you bring a springsuit/wetsuit, you will have to be able to carry it by yourselves and our tour guide will direct you when to wear it and when to take it off.
Keep your head warm with a beanie (hat) and scarf while trekking and especially while sleeping, and please try to keep your hair dry when swimming (for Tu Lan tours). Beanies, scarves, socks, and gloves can be purchased for a fair price in the Phong Nha local market.
Change into dry clothes immediately upon reaching camp (Tu Lan tours, and also Hang En tours if it’s been raining) and take a hot drink from the porters to warm up your body once getting to the campsite.
Let your tour guide know if you feel cold or unhealthy, and don’t hesitate to ask for more sleeping bags.