Climate averages 1991–2020

Cai Lậy weather
in September.

A hot, very wet month: the joint 8th warmest and the 11th driest of the year.

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

Average high 30.2°C Daytime mean, September

Average low 24.2°C Night-time mean, September

Rainfall 281 mm 28 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a hot month in Cai Lậy: daytime highs average 30.2°C and nights cool to about 24.2°C. By daytime temperature it is the joint 8th warmest of the 12 months.

Expect about 281 mm of rain on roughly 28 days, which makes September a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 11 min on an average September day.

The nearest other city in this atlas is Vĩnh Long (23 km away). In September its highs average 30.1°C, about as warm as Cai Lậy, with 278 mm of rain.

Among the 136 cities listed in Vietnam, Cai Lậy ranks joint 42nd of 136 for the warmest September highs and 82nd of 136 for the driest September (rainfall, lowest first). The mean September high of those 136 cities is 29.7°C; Cai Lậy is 0.6°C warmer than that mean.

From September to October, average highs fall by 0.2°C to 30.1°C, and monthly rainfall rises from 281 mm to 291 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

Cai Lậy climate table

1991–2020

Monthly climate averages for Cai Lậy, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	30.3°C22.3°C	22.3°C	28	4.1	11.612 h
February	31.7°C22.9°C	22.9°C	11	1.7	11.812 h
March	33.1°C24.2°C	24.2°C	30	5.3	12.112 h
April	33.6°C25.2°C	25.2°C	75	12.2	12.412 h
May	32.3°C25.3°C	25.3°C	176	24.1	12.613 h
June	30.7°C24.8°C	24.8°C	215	26.3	12.713 h
July	30.2°C24.5°C	24.5°C	233	27.8	12.713 h
August	30.3°C24.5°C	24.5°C	252	28.7	12.512 h
September, selected	30.2°C24.2°C	24.2°C	281	27.9	12.212 h
October	30.1°C23.7°C	23.7°C	291	26.8	11.912 h
November	30.1°C23.4°C	23.4°C	141	16.4	11.712 h
December	29.8°C22.6°C	22.6°C	67	9.2	11.512 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 Cai Lậy

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 Cai Lậy) is explained once on the Cai Lậy year overview and on the Sources, method and limits page.