Climate averages 1991–2020

Dien Bien Phu weather
in September.

A hot, very wet month: the 7th warmest and the 9th driest of the year.

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

Average high 28.3°C Daytime mean, September

Average low 21.8°C Night-time mean, September

Rainfall 199 mm 22 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a hot month in Dien Bien Phu: daytime highs average 28.3°C and nights cool to about 21.8°C. By daytime temperature it is the 7th warmest of the 12 months.

Expect about 199 mm of rain on roughly 22 days, which makes September a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 17 min on an average September day.

The nearest other city in this atlas is Thị Trấn Thuận Châu (69 km away). In September its highs average 27.9°C, about as warm as Dien Bien Phu, with 185 mm of rain.

Among the 136 cities listed in Vietnam, Dien Bien Phu ranks 123rd of 136 for the warmest September highs and 12th of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Dien Bien Phu is 1.4°C cooler than that mean.

From September to October, average highs fall by 1.3°C to 27.0°C, and monthly rainfall falls from 199 mm to 72 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

Dien Bien Phu climate table

1991–2020

Monthly climate averages for Dien Bien Phu, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	22.7°C12.7°C	12.7°C	35	5.0	11.011 h
February	25.6°C14.4°C	14.4°C	26	4.8	11.411 h
March	29.2°C17.8°C	17.8°C	55	8.5	12.012 h
April	30.1°C20.5°C	20.5°C	115	15.3	12.613 h
May	30.2°C22.1°C	22.1°C	195	22.2	13.113 h
June	29.3°C22.8°C	22.8°C	323	27.3	13.413 h
July	28.5°C22.6°C	22.6°C	403	28.9	13.313 h
August	28.6°C22.6°C	22.6°C	368	28.3	12.913 h
September, selected	28.3°C21.8°C	21.8°C	199	21.5	12.312 h
October	27.0°C19.5°C	19.5°C	72	11.5	11.712 h
November	25.2°C16.0°C	16.0°C	33	5.5	11.111 h
December	22.5°C12.7°C	12.7°C	29	4.5	10.911 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 Dien Bien Phu

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 Dien Bien Phu) is explained once on the Dien Bien Phu year overview and on the Sources, method and limits page.