Climate averages 1991–2020

Galle weather
in May.

A hot, very wet month: the 4th warmest and the wettest of the year.

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

Average high 28.6°C Daytime mean, May

Average low 25.5°C Night-time mean, May

Rainfall 279 mm 29 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

May is a hot month in Galle: daytime highs average 28.6°C and nights cool to about 25.5°C. By daytime temperature it is the 4th warmest of the 12 months.

Expect about 279 mm of rain on roughly 29 days, which makes May a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 24 min on an average May day.

The nearest other city in this atlas is Matara (38 km away). In May its highs average 29.0°C, about as warm as Galle, with 224 mm of rain.

Among the 12 cities listed in Sri Lanka, Galle ranks 11th of 12 for the warmest May highs and joint 10th of 12 for the driest May (rainfall, lowest first). The mean May high of those 12 cities is 30.6°C; Galle is 2.0°C cooler than that mean.

From May to June, average highs fall by 0.5°C to 28.1°C, and monthly rainfall falls from 279 mm to 244 mm.

The annual picture

May 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

Galle climate table

1991–2020

Monthly climate averages for Galle, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	28.3°C23.6°C	23.6°C	64	12.2	11.812 h
February	29.0°C24.0°C	24.0°C	51	10.3	11.912 h
March	29.6°C24.7°C	24.7°C	65	13.9	12.112 h
April	29.2°C25.4°C	25.4°C	147	22.6	12.312 h
May, selected	28.6°C25.5°C	25.5°C	279	28.6	12.412 h
June	28.1°C25.2°C	25.2°C	244	27.6	12.512 h
July	27.8°C24.9°C	24.9°C	214	27.5	12.412 h
August	27.7°C24.8°C	24.8°C	207	27.3	12.312 h
September	27.7°C24.7°C	24.7°C	240	26.5	12.212 h
October	27.8°C24.5°C	24.5°C	263	26.5	12.012 h
November	28.0°C24.2°C	24.2°C	250	23.5	11.912 h
December	28.0°C23.9°C	23.9°C	148	18.5	11.812 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

May in nearby cities

Distance from Galle

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