Dehiwala-Mount Lavinia climate

Name: Dehiwala-Mount Lavinia
Address: LK

Dehiwala-Mount Lavinia is warmest in March, with average highs of 31 °C, and coldest in January, when nights average 23 °C. November is the wettest month (376 mm) and February the driest (85 mm). Figures are 1991–2020 climate normals.

Across a full year Dehiwala-Mount Lavinia averages 2,773 mm of rain and 365 days above 25 °C.

Sri Lanka · population 219,827 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month March 31 °C
Coldest month January 23 °C
Driest month February 85 mm
Wettest month November 376 mm
Least cloud March 55 % cloud
Hottest on record February 35 °C
Coldest on record January 19 °C
Warmest sea April 30 °C

What to expectDehiwala-Mount Lavinia through the year

Dehiwala-Mount Lavinia changes little through the year. Average daily highs stay between 30 and 31 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 365 days a year reach 25 °C, 89 of them reach 30 °C. The warmest reading in the 1991–2020 record is 35 °C, in February.

Rain is strongly seasonal. November averages 376 mm against 85 mm in February — 4.4 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Dehiwala-Mount Lavinia is warmest in April at 30 °C and coldest in August at 27 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	29.9 °C	91 mm	61 %
February	30.7 °C	85 mm	56 %
March	30.9 °C	104 mm	55 %
April	30.4 °C	211 mm	69 %
May	29.3 °C	301 mm	83 %
June	28.6 °C	291 mm	86 %
July	28.3 °C	249 mm	86 %
August	28.1 °C	229 mm	84 %
September	28.2 °C	263 mm	83 %
October	28.5 °C	367 mm	83 %
November	28.7 °C	376 mm	80 %
December	29.0 °C	206 mm	70 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	29.9 °C	22.9 °C	26.0 °C	33.9 °C	18.5 °C	31	13
February	30.7 °C	23.5 °C	26.8 °C	35.4 °C	18.5 °C	28	20
March	30.9 °C	24.3 °C	27.3 °C	34.9 °C	21.9 °C	31	23
April	30.4 °C	24.9 °C	27.3 °C	34.1 °C	23.3 °C	30	20
May	29.3 °C	25.3 °C	27.0 °C	32.8 °C	23.8 °C	31	6
June	28.6 °C	25.1 °C	26.6 °C	30.6 °C	23.8 °C	30	0
July	28.3 °C	24.8 °C	26.3 °C	30.1 °C	22.6 °C	31	0
August	28.1 °C	24.7 °C	26.2 °C	30.1 °C	22.8 °C	31	0
September	28.2 °C	24.5 °C	26.1 °C	30.8 °C	22.8 °C	30	0
October	28.5 °C	24.1 °C	26.0 °C	30.6 °C	21.1 °C	31	0
November	28.7 °C	23.6 °C	25.8 °C	31.1 °C	20.3 °C	30	2
December	29.0 °C	23.2 °C	25.7 °C	32.7 °C	19.2 °C	31	5

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	91 mm	11	12 h/day	61 %	76 %	12 km/h	27.8 °C
February	85 mm	11	12 h/day	56 %	76 %	12 km/h	28.2 °C
March	104 mm	17	12 h/day	55 %	79 %	12 km/h	29.1 °C
April	211 mm	26	12 h/day	69 %	84 %	12 km/h	29.7 °C
May	301 mm	30	12 h/day	83 %	86 %	16 km/h	29.3 °C
June	291 mm	29	13 h/day	86 %	87 %	18 km/h	28.4 °C
July	249 mm	29	12 h/day	86 %	86 %	18 km/h	27.6 °C
August	229 mm	29	12 h/day	84 %	86 %	18 km/h	27.4 °C
September	263 mm	28	12 h/day	83 %	86 %	17 km/h	27.7 °C
October	367 mm	28	12 h/day	83 %	87 %	15 km/h	28.2 °C
November	376 mm	24	12 h/day	80 %	86 %	12 km/h	28.6 °C
December	206 mm	19	12 h/day	70 %	82 %	12 km/h	28.2 °C

Planning a trip? See the best time to visit Dehiwala-Mount Lavinia.

QuestionsCommon questions about Dehiwala-Mount Lavinia’s climate

When is the best time to visit Dehiwala-Mount Lavinia?

That depends on what you want, so the honest answer is a comparison rather than a single month. October, November, December sit closest to 20 °C on average, March is the warmest month and February the driest. The month-by-month table above has the full picture.

How hot does Dehiwala-Mount Lavinia get?

In March, the warmest month, daily highs average 31 °C. About 89 days a year pass 30 °C. The highest value in the 1991–2020 record is 35 °C.

How cold does it get in winter?

Nights average 23 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Dehiwala-Mount Lavinia?

November, averaging 376 mm over 24 days with rain. The driest month is February with 85 mm. The year as a whole averages 2,773 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Dehiwala-Mount Lavinia rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 6.840°, 79.871° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.