Monthly Climate
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Best time to visit Dehiwala-Mount Lavinia

January is the best time to visit Dehiwala-Mount Lavinia for general sightseeing, with average highs of 30 °C and about 11 wet days. The comfortable season runs roughly December to February.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking January comfort 63/100
A beach holiday January sea 28 °C
The least cloud March 55 % average cloud cover
The least rain February 85 mm
Warmth March 31 °C
Cooler weather August 28 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 January 63 30 °C 11 78
2 February 61 31 °C 11 76
3 December 54 29 °C 19 71
4 November 51 29 °C 24 70
5 October 50 28 °C 28 71
6 September 50 28 °C 28 73
7 March 49 31 °C 17 64
8 August 49 28 °C 29 73
9 July 49 28 °C 29 73
10 June 47 29 °C 29 71
11 May 46 29 °C 30 67
12 April 45 30 °C 26 63

For a beach holiday

January scores highest, with a sea temperature of 28 °C and air temperatures around 30 °C. The sea never reaches 20 °C here.

Month Sea Air Sunshine Beach score
January 28 °C 30 °C 61 % 78
February 28 °C 31 °C 56 % 76
March 29 °C 31 °C 55 % 64
April 30 °C 30 °C 69 % 63
May 29 °C 29 °C 83 % 67
June 28 °C 29 °C 86 % 71
July 28 °C 28 °C 86 % 73
August 27 °C 28 °C 84 % 73
September 28 °C 28 °C 83 % 73
October 28 °C 28 °C 83 % 71
November 29 °C 29 °C 80 % 70
December 28 °C 29 °C 70 % 71

When to think twice

April scores lowest with about 26 wet days and highs near 30 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

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 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. 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.