Climate averages 1991–2020
Sầm Sơn weather
in December.
A mild, moderately wet month: the 11th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a mild month in Sầm Sơn: daytime highs average 21.1°C and nights cool to about 16.3°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 53 mm of rain on roughly 9 days, which makes December a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 58 min on an average December day.
The nearest other city in this atlas is Thanh Hóa (16 km away). In December its highs average 21.3°C, about as warm as Sầm Sơn, with 26 mm of rain.
Among the 136 cities listed in Vietnam, Sầm Sơn ranks joint 100th of 136 for the warmest December highs and joint 61st of 136 for the driest December (rainfall, lowest first). The mean December high of those 136 cities is 25.0°C; Sầm Sơn is 4.0°C cooler than that mean.
From December to January, average highs fall by 1.2°C to 19.8°C, and monthly rainfall rises from 53 mm to 55 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sầm Sơn climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.8°C15.4°C | 15.4°C | 55 | 10.5 | 11.111 h |
| February | 21.2°C16.7°C | 16.7°C | 36 | 8.5 | 11.511 h |
| March | 23.8°C19.2°C | 19.2°C | 52 | 9.7 | 12.012 h |
| April | 27.3°C22.6°C | 22.6°C | 62 | 7.5 | 12.613 h |
| May | 30.3°C25.5°C | 25.5°C | 139 | 12.2 | 13.113 h |
| June | 32.0°C27.5°C | 27.5°C | 146 | 11.0 | 13.313 h |
| July | 31.7°C27.4°C | 27.4°C | 212 | 12.7 | 13.213 h |
| August | 30.9°C26.5°C | 26.5°C | 312 | 20.1 | 12.813 h |
| September | 29.5°C25.2°C | 25.2°C | 368 | 20.1 | 12.312 h |
| October | 27.4°C22.9°C | 22.9°C | 241 | 16.2 | 11.712 h |
| November | 24.7°C19.9°C | 19.9°C | 82 | 9.9 | 11.211 h |
| December, selected | 21.1°C16.3°C | 16.3°C | 53 | 8.9 | 11.011 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Thanh Hóa in DecemberVietnam · 16 kmHigh 21.3°C · Low 15.8°C · 26 mm rain
- Nghi Sơn in DecemberVietnam · 46 kmHigh 20.8°C · Low 16.1°C · 30 mm rain
- Hoàng Mai in DecemberVietnam · 55 kmHigh 21.5°C · Low 16.2°C · 30 mm rain
- Hoa Lư in DecemberVietnam · 59 kmHigh 21.3°C · Low 14.6°C · 28 mm rain
- Nam Định in DecemberVietnam · 83 kmHigh 21.4°C · Low 15.1°C · 29 mm rain
- Phủ Lý in DecemberVietnam · 90 kmHigh 21.2°C · Low 14.4°C · 29 mm rain
- Hưng Yên in DecemberVietnam · 103 kmHigh 21.3°C · Low 14.4°C · 30 mm rain
- Vinh in DecemberVietnam · 120 kmHigh 21.2°C · Low 16.9°C · 47 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sầm Sơn) is explained once on the Sầm Sơn year overview and on the Sources, method and limits page.