Climate averages 1991–2020
Sầm Sơn weather
by month.
See how the year changes. June has the highest average daily maximum; February has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: April
Long-term climate patterns, not a forecast for a particular trip.
Across the year Sầm Sơn averages a daytime high of 26.6°C and a nighttime low of 22.1°C, with about 1,759 mm of rain on roughly 147 days. June is the warmest month (average high 32.0°C) and January the coolest (19.8°C). September is the wettest month with 368 mm; February is the driest with 36 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): April. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Sầm Sơn
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 | 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
Nearby cities
- Thanh HóaVietnam · 16 kmHigh 27.2°C · Low 21.8°C · 1,535 mm rain a year
- Nghi SơnVietnam · 46 kmHigh 27.1°C · Low 21.7°C · 1,395 mm rain a year
- Hoàng MaiVietnam · 55 kmHigh 27.9°C · Low 22.0°C · 1,395 mm rain a year
- Hoa LưVietnam · 59 kmHigh 27.3°C · Low 21.0°C · 1,630 mm rain a year
- Nam ĐịnhVietnam · 83 kmHigh 27.2°C · Low 21.3°C · 1,624 mm rain a year
- Phủ LýVietnam · 90 kmHigh 27.3°C · Low 20.8°C · 1,652 mm rain a year
- Hưng YênVietnam · 103 kmHigh 27.3°C · Low 20.9°C · 1,654 mm rain a year
- VinhVietnam · 120 kmHigh 27.7°C · Low 22.3°C · 1,510 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+7, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 19.80°, 105.90° (7 km from the city centre). Rain comes from the 0.25° cell at 19.75°, 106.00°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.