How cold does Hanoi get in winter — do I need a coat?
Yes — bring a real jacket. January averages 10–17°C, but humidity and wind make it feel colder than the number suggests. Indoor spaces (cafés, hotel lobbies, shops) are often unheated, so the cold follows you inside. You need a warm layer, not just a light cardigan. A packable down jacket or fleece is ideal.
Hanoi at 21° north latitude is far enough from the equator to have a real winter. Not a tropical-winter-that’s-still-30°C — a genuine cold season where you need a jacket and where 10°C at 7am with 85% humidity feels colder than it sounds.
The numbers
| Month | Low | High | Humidity | Feels like |
|---|---|---|---|---|
| December | 13°C | 20°C | 75% | Cool, dry |
| January | 10°C | 17°C | 80% | Cold, damp |
| February | 13°C | 19°C | 85% | Cold, overcast |
January is the coldest month. The record low is around 5°C. On a wet, windy January morning at 10°C, it’s uncomfortable standing still for more than 15 minutes.
Why it feels colder than the number
15°C in a dry climate is a pleasant autumn day. 15°C in Hanoi with 80% humidity and no central heating feels like 8°C. The moisture in the air conducts heat away from your body faster. Buildings are concrete with tile floors and no insulation — they stay cold all day. When you step into a café at 10am and it’s 15°C inside too, you don’t get relief.
What to pack
- Packable down jacket or thick fleece — the one thing you’ll wear every day from December through February
- 2–3 long-sleeve base layers — merino or cotton, for layering under the jacket
- Jeans or heavy trousers — shorts are useless in January
- Beanie or scarf — early mornings and evenings on the motorbike are the coldest moments
- Closed shoes — sneakers are fine; sandals are not
Layering is more practical than one heavy coat. You’ll take layers on and off as you move between cold streets and warmer (but not warm) indoor spaces. A down jacket that compresses into its own pocket is ideal — pack it for the trip, wear it every day in Hanoi, and forget about it once you go south to Huế or Saigon.