Climate averages 1991–2020

Lào Cai weather
in September.

A hot, wet month: the 5th warmest and the 8th driest of the year.

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

Average high 29.8°C Daytime mean, September

Average low 23.5°C Night-time mean, September

Rainfall 165 mm 18 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a hot month in Lào Cai: daytime highs average 29.8°C and nights cool to about 23.5°C. By daytime temperature it is the 5th warmest of the 12 months.

Expect about 165 mm of rain on roughly 18 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 18 min on an average September day.

The nearest other city in this atlas is Bắc Quang (92 km away). In September its highs average 30.4°C, 0.6°C warmer than Lào Cai, with 226 mm of rain.

Among the 136 cities listed in Vietnam, Lào Cai ranks joint 87th of 136 for the warmest September highs and 6th of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Lào Cai is 0.1°C warmer than that mean.

From September to October, average highs fall by 2.9°C to 26.9°C, and monthly rainfall falls from 165 mm to 118 mm.

The annual picture

September 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	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, selected	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

September 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.