Frost & Fog in Sa Pa

Tonight's frost risk and today's fog, hour by hour, read from the forecast on the published Met Office frost and WMO fog scales — for the roads and the terraces.

Sa Pa's weather question isn't 'is it hot' — it's frost and fog. This page reads the forecast for frost risk on the high ground and for fog that drops visibility on the roads and leaves the streets grey, in plain words. It's a modelled estimate, not a measurement.

Today, Monday 15 June

No frost expected today. Fog likely 4 am–7 am.

As of 15 June at 19:42. Modelled forecast for the area around central Sa Pa (around 1,560 m), refreshed about every half hour.

Hour by hour today

midnightMistMist (1 km).
1 amMistMist (1.3 km).
2 amMistMist (1 km).
3 amMistMist (1.1 km).
4 amFogFog (880 m).
5 amFogFog (560 m).
6 amFogFog (540 m).
7 amMistMist (3.9 km).
8 amMistMist (3.6 km).
9 amClearClear, no frost.
10 amClearClear, no frost.
11 amClearClear, no frost.
noonClearClear, no frost.
1 pmClearClear, no frost.
2 pmMistMist (4.2 km).
3 pmClearClear, no frost.
4 pmClearClear, no frost.
5 pmClearClear, no frost.
6 pmClearClear, no frost.
7 pmMistMist (1.9 km).
8 pmFogFog (780 m).
9 pmFogFog (820 m).
10 pmClearClear, no frost.
11 pmMistMist (1.2 km).

The next two days

Day	Lowest temp	Frost risk	Worst visibility
Tuesday 16 June	18°C	No frost	Fog
Wednesday 17 June	18°C	No frost	Fog

A modelled estimate, not a measurement

Frost and fog change slope to slope and minute to minute — a sheltered terrace can frost while the road stays clear, and a bank of fog can roll in within the hour. This page is a model’s best guess, never a measurement and never a promise. Drive to the conditions you can see, cover tender crops on the cold nights, and for anything that matters use the official forecast.

How this page decides

Frost uses the UK Met Office frost definitions, applied to the forecast minimum air temperature: Ground-frost risk when the low is between 0 and 4 °C (surfaces can still cool below the air on a clear, calm night), Air frost when the air itself reaches 0 °C or below, and we call the coldest nights — around −2 °C and below — Hard frost.

Fog uses the standard WMO and Met Office fog definitions, applied to the modelled visibility: Mist from 1 to 5 km, Fog below 1 km, and Dense fog below 200 m. The number is the model’s visibility for the area, not a reading on your road.

Reading it for what you’re doing

On the roads

Here the real driving hazards are fog and frost, not heat. Fog can drop visibility to a few hundred metres on the Ô Quý Hồ and Lào Cai bends, and frost ices the road on cold nights. When fog or frost is flagged, slow right down and use low beams.

For the terraces and gardens

Frost (băng giá) can burn tender vegetables, flowers and young black cardamom on the high ground. A frost night is the time to cover or bring in what you can.

Worth knowing

Frost, and rare snow, on the heights

Frost forms on Sa Pa's high ground during the December–January cold spells, and ice or thin snow occasionally reaches the Fansipan summit and the Ô Quý Hồ pass. Snow here is rare and, by recent reporting, getting rarer.

Source: Climate of Sa Pa, checked 2026-06-15

Fog is a year-round fact

Sa Pa sits in cloud for much of the year. Mornings and evenings often close in even in summer, leaving the streets grey and the passes hard to see. This page reads the forecast fog as well as the cold, so it stays useful in every season.

The official channels

Lào Cai forecast — NCHMFVietnam's national met service, province-level forecast — the authoritative source if this page can't load.
NCHMF national hazard warningsOfficial frost (sương muối / băng giá), fog and cold-spell bulletins.

Fetched 15 June at 19:42. These are modelled estimates for the area around central Sa Pa (around 1,560 m), not measurements — a frost pocket or a fog bank on one slope won’t show in an area-wide number. Weather data by Open-Meteo (CC BY 4.0). Frost categories from the UK Met Office; fog bands from the WMO and Met Office.