Climate averages 1991–2020

Móng Cái weather
in September.

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 29.1°C Daytime mean, September

Average low 24.9°C Night-time mean, September

Rainfall 253 mm 19 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a hot month in Móng Cái: daytime highs average 29.1°C and nights cool to about 24.9°C. By daytime temperature it is the 4th warmest of the 12 months.

Expect about 253 mm of rain on roughly 19 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 Dongxing (3 km away). In September its highs average 29.2°C, about as warm as Móng Cái, with 254 mm of rain.

Among the 136 cities listed in Vietnam, Móng Cái ranks joint 115th of 136 for the warmest September highs and 55th of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Móng Cái is 0.6°C cooler than that mean.

From September to October, average highs fall by 2.2°C to 26.9°C, and monthly rainfall falls from 253 mm to 99 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

Móng Cái climate table

1991–2020

Monthly climate averages for Móng Cái, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	17.4°C12.8°C	12.8°C	69	12.8	11.011 h
February	18.9°C14.3°C	14.3°C	51	11.2	11.411 h
March	21.8°C17.4°C	17.4°C	74	13.1	12.012 h
April	25.4°C21.3°C	21.3°C	70	12.7	12.613 h
May	28.1°C24.3°C	24.3°C	209	19.0	13.213 h
June	29.6°C26.3°C	26.3°C	288	23.5	13.413 h
July	29.7°C26.4°C	26.4°C	380	25.0	13.313 h
August	29.8°C26.1°C	26.1°C	374	24.6	12.913 h
September, selected	29.1°C24.9°C	24.9°C	253	18.6	12.312 h
October	26.9°C22.2°C	22.2°C	99	10.2	11.712 h
November	23.4°C18.3°C	18.3°C	67	9.1	11.111 h
December	19.1°C14.0°C	14.0°C	53	8.8	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 Móng Cái

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 Móng Cái) is explained once on the Móng Cái year overview and on the Sources, method and limits page.