Climate averages 1991–2020

Lào Cai weather
in May.

A hot, very wet month: the 4th warmest and the 9th driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 31.1°C Daytime mean, May

Average low 23.5°C Night-time mean, May

Rainfall 199 mm 20 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

May is a hot month in Lào Cai: daytime highs average 31.1°C and nights cool to about 23.5°C. By daytime temperature it is the 4th warmest of the 12 months.

Expect about 199 mm of rain on roughly 20 days, which makes May a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 12 min on an average May day.

The nearest other city in this atlas is Bắc Quang (92 km away). In May its highs average 30.5°C, 0.6°C cooler than Lào Cai, with 324 mm of rain.

Among the 136 cities listed in Vietnam, Lào Cai ranks joint 73rd of 136 for the warmest May highs and 66th of 136 for the driest May (rainfall, lowest first). The mean May high of those 136 cities is 31.2°C; Lào Cai is 0.1°C cooler than that mean.

From May to June, average highs rise by 0.7°C to 31.8°C, and monthly rainfall rises from 199 mm to 242 mm.

The annual picture

May in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Lào Cai climate table

1991–2020

Monthly climate averages for Lào Cai, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	18.9°C12.1°C	12.1°C	96	18.1	10.911 h
February	21.4°C13.3°C	13.3°C	88	17.1	11.411 h
March	25.5°C16.7°C	16.7°C	126	19.0	12.012 h
April	29.3°C20.6°C	20.6°C	129	17.6	12.713 h
May, selected	31.1°C23.5°C	23.5°C	199	19.7	13.213 h
June	31.8°C25.1°C	25.1°C	242	22.0	13.513 h
July	31.3°C24.8°C	24.8°C	261	23.2	13.413 h
August	31.2°C24.5°C	24.5°C	268	22.4	12.913 h
September	29.8°C23.5°C	23.5°C	165	18.1	12.312 h
October	26.9°C21.2°C	21.2°C	118	16.6	11.612 h
November	23.9°C17.2°C	17.2°C	88	13.8	11.111 h
December	20.0°C13.2°C	13.2°C	92	14.1	10.811 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

May in nearby cities

Distance from Lào Cai

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 limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Lào Cai) is explained once on the Lào Cai year overview and on the Sources, method and limits page.