Avg High
Hanoi in December
Avg Low
Rain
Daylight
11h
What to expect
December in Hanoi is early winter, with a settled seasonal pattern already in place. The month is mostly mild for steady exploring, with a noticeable cool-down after sunset. The daylight window is balanced for full days without endless late evenings. Most days feel close to what the averages suggest, with straightforward pacing.
December in context
How it compares to the rest of the year in Hanoi.
Hottest (avg)
#11 / 12
Wettest (avg)
#11 / 12
Daylight Hours
#12 / 12
Windiest (avg)
#7 / 12
Highest UV
#12 / 12
Most Humid
#12 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 10.9 h
- UV index (max)
- 6
- Typical sun hours
- 06:25 - 17:18
Rain & Snow
- Total rain
-
- Rainy days
- 9 days
- Cloud cover (avg)
- 65%
Humidity & Wind
- Humidity (avg)
- 72%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for December. Typical high 20.6°C and low 13.9°C.
Typical disruptions in December
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in December.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 6% of days (1.9 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.9 days / month
~6% of days
Why this matters
- Expected days 1.9 days / month
- Probability ~6% of days
- Intensity Up to ~23mm (P95)
Washout conditions are possible on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Moderate
Rain disruption Measures: Likely rain disruption days. Observed about 6% of days (2.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
2.0 days / month
~6% of days
Why this matters
- Expected days 2.0 days / month
- Probability ~6% of days
- Intensity Up to ~23mm (P95)
Rain disruption risk appears on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Humidity Moderate
Muggy days Measures: Muggy days (dew point >=20C). Observed about 5% of days (1.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.5 days / month
~5% of days
Why this matters
- Expected days 1.5 days / month
- Probability ~5% of days
- Intensity Up to ~23°C (P95)
Muggy conditions are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cold Moderate
Cold feels-like nights Measures: Cold feels-like nights (min <=5C). Observed about 3% of days (1.1 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.1 days / month
~3% of days
Why this matters
- Expected days 1.1 days / month
- Probability ~3% of days
- Intensity Up to ~5°C (P95)
Cold feels-like nights are possible on ~1 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Show all disruptions (16 more)
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 0.5 days/month in December. Historical risk signal only, not a day-by-day forecast.
0.5 days / month
Probability unavailable
Why this matters
- Expected days 0.5 days / month
- Probability —
- Intensity Up to ~32mm (P95)
Multi-day washout runs are possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Moderate
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 2% of days (0.8 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.8 days / month
~2% of days
Why this matters
- Expected days 0.8 days / month
- Probability ~2% of days
- Intensity Up to ~26mm (P95)
Heavy rain is possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Heat Moderate
Hot feels-like days Measures: Hot feels-like days (>=32C). Observed about 1% of days (0.3 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.3 days / month
~1% of days
Why this matters
- Expected days 0.3 days / month
- Probability ~1% of days
- Intensity Up to ~34°C (P95)
Feels-like heat >=32C is possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 62% of days (19.1 days/month) in December. Historical risk signal only, not a day-by-day forecast.
19.1 days / month
~62% of days
Why this matters
- Expected days 19.1 days / month
- Probability ~62% of days
- Intensity Up to ~100% (P95)
Cloudy skies are possible on ~19 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 43% of days (13.4 days/month) in December. Historical risk signal only, not a day-by-day forecast.
13.4 days / month
~43% of days
Why this matters
- Expected days 13.4 days / month
- Probability ~43% of days
- Intensity Up to ~100% (P95)
Mostly cloudy skies are possible on ~13 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 39% of days (12.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
12.0 days / month
~39% of days
Why this matters
- Expected days 12.0 days / month
- Probability ~39% of days
- Intensity Up to ~11mm (P95)
Measurable rain is possible on ~12 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 33% of days (10.2 days/month) in December. Historical risk signal only, not a day-by-day forecast.
10.2 days / month
~33% of days
Why this matters
- Expected days 10.2 days / month
- Probability ~33% of days
- Intensity Up to ~90% (P95)
High humidity is possible on ~10 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 28% of days (8.8 days/month) in December. Historical risk signal only, not a day-by-day forecast.
8.8 days / month
~28% of days
Why this matters
- Expected days 8.8 days / month
- Probability ~28% of days
- Intensity Up to ~21h (P95)
Several rainy hours are possible on ~9 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 25% of days (7.6 days/month) in December. Historical risk signal only, not a day-by-day forecast.
7.6 days / month
~25% of days
Why this matters
- Expected days 7.6 days / month
- Probability ~25% of days
- Intensity Up to ~100% (P95)
Overcast skies are possible on ~8 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 18% of days (5.6 days/month) in December. Historical risk signal only, not a day-by-day forecast.
5.6 days / month
~18% of days
Why this matters
- Expected days 5.6 days / month
- Probability ~18% of days
- Intensity Up to ~22h (P95)
Wet-most-of-day conditions are possible on ~6 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Humidity Minor
Humid days Measures: Humid days (dew point >=18C). Observed about 13% of days (3.9 days/month) in December. Historical risk signal only, not a day-by-day forecast.
3.9 days / month
~13% of days
Why this matters
- Expected days 3.9 days / month
- Probability ~13% of days
- Intensity Up to ~22°C (P95)
Humid conditions are possible on ~4 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 4% of days (1.2 days/month) in December. Historical risk signal only, not a day-by-day forecast.
1.2 days / month
~4% of days
Why this matters
- Expected days 1.2 days / month
- Probability ~4% of days
- Intensity Up to ~52km/h (P95)
Gusty conditions are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Heat Minor
Warm nights Measures: Warm nights (min >=22C). Observed about 1% of days (0.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.5 days / month
~1% of days
Why this matters
- Expected days 0.5 days / month
- Probability ~1% of days
- Intensity Up to ~23°C (P95)
Warm nights are possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Visibility Minor
Fog-likely signal Measures: Fog-likely visibility proxy. Observed about 1% of days (0.4 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~92% (P95)
Fog-likely conditions are possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Other Minor
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data Measures: Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data. Observed about 1% of days (0.4 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~92 (P95)
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data is possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
Convective risk Measures: Convective storm risk proxy. Observed about 1% of days (0.4 days/month) in December. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~22°C (P95)
Convective risk signal appears on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Frequently asked questions
Is December a good time to visit Hanoi?
Typical December days in Hanoi reach highs of 21°C (70°F) with nights around 14°C (57°F). It usually feels mild by day and cool after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in December?
In December, you can usually expect highs of 21°C (70°F) and lows near 14°C (57°F). That means mild days and cool nights, so pack layers you can add or remove.
How much does it rain in December?
Rainfall in December averages 33 mm (1.3 in) across roughly 9 days. Overall it is a moderately wet time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in December?
You can expect about 11 hours of daylight in December. Sunrise is typically around 06:25 and sunset near 17:18. Days are on the shorter side, so plan activities around limited daylight.
How strong is the sun in December?
UV levels are moderate (around 6); sunscreen and sunglasses are still a good idea.
Is it windy in December?
In December, average wind speeds are around 8 km/h (5 mph), with gusts on the windiest days reaching about 34 km/h (21 mph). On the ground, it is a gentle to moderate breeze is common, but stronger winds are not frequent.