Climate averages 1991–2020

Chetumal weather
in August.

A hot, wet month: the 3rd 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, August

Average low 24.9°C Night-time mean, August

Rainfall 158 mm 23 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

August is a hot month in Chetumal: daytime highs average 31.1°C and nights cool to about 24.9°C. By daytime temperature it is the 3rd warmest of the 12 months.

Expect about 158 mm of rain on roughly 23 days, which makes August a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 45 min on an average August day.

The nearest other city in this atlas is Belmopan (149 km away). In August its highs average 30.8°C, about as warm as Chetumal, with 126 mm of rain.

Among the 153 cities listed in Mexico, Chetumal ranks joint 47th of 153 for the warmest August highs and joint 99th of 153 for the driest August (rainfall, lowest first). The mean August high of those 153 cities is 27.9°C; Chetumal is 3.2°C warmer than that mean.

From August to September, average highs fall by 0.5°C to 30.6°C, and monthly rainfall rises from 158 mm to 186 mm.

The annual picture

August 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

Chetumal climate table

1991–2020

Monthly climate averages for Chetumal, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	26.9°C20.8°C	20.8°C	52	12.3	11.111 h
February	28.2°C21.6°C	21.6°C	24	7.2	11.512 h
March	29.7°C22.4°C	22.4°C	26	6.8	12.012 h
April	31.3°C24.0°C	24.0°C	32	7.4	12.613 h
May	31.6°C24.8°C	24.8°C	93	15.3	13.013 h
June	30.4°C25.0°C	25.0°C	193	21.5	13.213 h
July	30.8°C24.9°C	24.9°C	120	20.9	13.113 h
August, selected	31.1°C24.9°C	24.9°C	158	23.2	12.813 h
September	30.6°C24.6°C	24.6°C	186	25.2	12.312 h
October	29.2°C23.5°C	23.5°C	190	21.8	11.712 h
November	27.8°C22.0°C	22.0°C	96	14.8	11.311 h
December	27.1°C21.2°C	21.2°C	55	13.3	11.011 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

August in nearby cities

Distance from Chetumal

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