Puttalam Weather in May

NASA POWER reanalysis for the half-degree grid cell around Puttalam, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 31°C on May 1 to 30°C on May 31, and lows from 27°C to 27°C. Normal precipitation for the month is 105 mm over about 16 wet days.

May day by day

The normal high and low for each date, in °C.

Normal low
Normal high
Reanalysis extreme high
Reanalysis extreme low

May at a glance

Average high: 31°C
Average low: 27°C
Precipitation: 105 mm
Reanalysis high: 37°CMay 7, 1998
Reanalysis low: 25°CMay 1, 2010
Daylight: 12 h 24 min to 12 h 33 min
Cloud cover: 66%
Humidity: 81%
Dew point: 25°C
Wind: 21.6 km/h

Every day of the month

A wet day has at least 1 mm of precipitation in the reanalysis.

Date	Normal high	Normal low	Reanalysis high	Reanalysis low	Chance wet
May 1	31°C	27°C	33°C 1998	25°C 2010	61%
May 2	31°C	27°C	34°C 2020	26°C 2003	60%
May 3	31°C	27°C	34°C 1991	26°C 2015	58%
May 4	31°C	27°C	34°C 1991	25°C 1997	56%
May 5	31°C	27°C	35°C 1998	25°C 2014	54%
May 6	31°C	27°C	36°C 1998	25°C 2014	54%
May 7	31°C	27°C	37°C 1998	25°C 1994	54%
May 8	31°C	27°C	34°C 2000	25°C 1999	53%
May 9	31°C	27°C	34°C 2000	25°C 1999	53%
May 10	31°C	27°C	34°C 1993	26°C 2018	52%
May 11	31°C	27°C	33°C 2019	25°C 2015	51%
May 12	31°C	27°C	34°C 1996	25°C 2015	50%
May 13	31°C	27°C	33°C 1996	25°C 2011	49%
May 14	31°C	27°C	34°C 1996	25°C 2011	48%
May 15	31°C	27°C	34°C 2019	25°C 1997	46%
May 16	31°C	27°C	34°C 1996	25°C 1999	45%
May 17	31°C	27°C	34°C 1996	25°C 1999	44%
May 18	31°C	27°C	34°C 1996	25°C 2018	44%
May 19	31°C	27°C	33°C 1996	25°C 2011	44%
May 20	31°C	27°C	34°C 1996	26°C 1993	44%
May 21	31°C	27°C	35°C 1996	26°C 2010	43%
May 22	31°C	27°C	34°C 1996	25°C 1995	43%
May 23	31°C	27°C	34°C 2000	25°C 1995	44%
May 24	31°C	27°C	34°C 1996	26°C 1999	44%
May 25	31°C	27°C	32°C 1996	26°C 1999	44%
May 26	30°C	27°C	33°C 2019	26°C 1999	44%
May 27	30°C	27°C	34°C 2019	25°C 1999	44%
May 28	30°C	27°C	34°C 2019	25°C 1999	45%
May 29	30°C	27°C	33°C 2019	25°C 1999	46%
May 30	30°C	27°C	32°C 1997	25°C 1999	48%
May 31	30°C	27°C	33°C 2019	25°C 1999	50%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+5:30).

May 1: sunrise 5:56 AM, sunset 6:20 PM
May 31: sunrise 5:52 AM, sunset 6:25 PM

Every day of May: sun and moon

Other months

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.