Climate averages 1991–2020

Saint John’s weather
in August.

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

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

Average high 28.8°C Daytime mean, August

Average low 26.3°C Night-time mean, August

Rainfall 98 mm 18 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

August is a hot month in Saint John’s: daytime highs average 28.8°C and nights cool to about 26.3°C. By daytime temperature it is the warmest month of the year.

Expect about 98 mm of rain on roughly 18 days, which makes August a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 42 min on an average August day.

The nearest other city in this atlas is Basseterre (96 km away). In August its highs average 28.5°C, about as warm as Saint John’s, with 91 mm of rain.

From August to September, average highs fall by 0.1°C to 28.7°C, and monthly rainfall rises from 98 mm to 127 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

Saint John’s climate table

1991–2020

Monthly climate averages for Saint John’s, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	26.2°C24.2°C	24.2°C	32	10.0	11.211 h
February	26.2°C24.0°C	24.0°C	21	7.1	11.612 h
March	26.5°C24.1°C	24.1°C	21	6.6	12.012 h
April	27.2°C24.6°C	24.6°C	33	8.8	12.513 h
May	27.9°C25.4°C	25.4°C	62	12.4	12.913 h
June	28.5°C26.0°C	26.0°C	51	12.1	13.113 h
July	28.6°C26.1°C	26.1°C	78	15.9	13.013 h
August, selected	28.8°C26.3°C	26.3°C	98	17.8	12.713 h
September	28.7°C26.2°C	26.2°C	127	18.0	12.212 h
October	28.2°C26.0°C	26.0°C	132	18.8	11.812 h
November	27.5°C25.4°C	25.4°C	103	15.8	11.311 h
December	26.7°C24.8°C	24.8°C	57	13.3	11.111 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 Saint John’s

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 Saint John’s) is explained once on the Saint John’s year overview and on the Sources, method and limits page.