Climate averages 1991–2020

Kalmunai weather
in May.

A hot, moderately wet month: the 4th warmest and the 4th driest of the year.

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

Average high 32.3°C Daytime mean, May

Average low 26.6°C Night-time mean, May

Rainfall 59 mm 12 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

May is a hot month in Kalmunai: daytime highs average 32.3°C and nights cool to about 26.6°C. By daytime temperature it is the 4th warmest of the 12 months.

Expect about 59 mm of rain on roughly 12 days, which makes May a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 27 min on an average May day.

The nearest other city in this atlas is Batticaloa (37 km away). In May its highs average 33.4°C, 1.1°C warmer than Kalmunai, with 50 mm of rain.

Among the 12 cities listed in Sri Lanka, Kalmunai ranks 3rd of 12 for the warmest May highs and 5th of 12 for the driest May (rainfall, lowest first). The mean May high of those 12 cities is 30.6°C; Kalmunai is 1.7°C warmer than that mean.

From May to June, average highs rise by 0.9°C to 33.2°C, and monthly rainfall falls from 59 mm to 31 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

Kalmunai climate table

1991–2020

Monthly climate averages for Kalmunai, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	27.0°C24.0°C	24.0°C	186	17.8	11.712 h
February	27.8°C24.1°C	24.1°C	96	13.2	11.912 h
March	29.5°C24.7°C	24.7°C	60	10.0	12.112 h
April	30.8°C25.8°C	25.8°C	70	13.3	12.312 h
May, selected	32.3°C26.6°C	26.6°C	59	11.6	12.512 h
June	33.2°C26.6°C	26.6°C	31	6.7	12.513 h
July	33.2°C26.4°C	26.4°C	31	7.5	12.513 h
August	32.8°C26.1°C	26.1°C	42	9.3	12.412 h
September	32.0°C25.9°C	25.9°C	67	13.6	12.212 h
October	30.2°C25.2°C	25.2°C	164	20.8	12.012 h
November	28.2°C24.5°C	24.5°C	280	24.8	11.812 h
December	27.2°C24.2°C	24.2°C	310	22.6	11.712 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 Kalmunai

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