Monthly Climate
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Best time to visit Si Racha

December is the best time to visit Si Racha for general sightseeing, with average highs of 30 °C and about 3 wet days. The comfortable season runs roughly November 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 December comfort 74/100
A beach holiday December sea 28 °C
The least cloud February 39 % average cloud cover
The least rain December 11 mm
Warmth April 32 °C
Cooler weather September 30 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 December 74 30 °C 3 95
2 January 73 30 °C 5 92
3 February 68 31 °C 5 89
4 November 67 30 °C 7 84
5 March 57 31 °C 10 73
6 April 48 32 °C 14 59
7 October 47 30 °C 22 66
8 September 47 30 °C 25 66
9 August 45 30 °C 23 66
10 July 44 30 °C 22 64
11 June 43 30 °C 21 61
12 May 41 31 °C 21 57

For a beach holiday

December 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 44 % 92
February 28 °C 31 °C 39 % 89
March 29 °C 31 °C 45 % 73
April 30 °C 32 °C 58 % 59
May 31 °C 31 °C 81 % 57
June 30 °C 30 °C 88 % 61
July 30 °C 30 °C 88 % 64
August 29 °C 30 °C 90 % 66
September 29 °C 30 °C 89 % 66
October 29 °C 30 °C 77 % 66
November 29 °C 30 °C 56 % 84
December 28 °C 30 °C 50 % 95

When to think twice

May scores lowest with about 21 wet days and highs near 31 °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 30.1 °C 21 mm 44 %
February 30.6 °C 23 mm 39 %
March 31.3 °C 58 mm 45 %
April 31.9 °C 90 mm 58 %
May 31.2 °C 143 mm 81 %
June 30.5 °C 127 mm 88 %
July 30.0 °C 133 mm 88 %
August 29.8 °C 135 mm 90 %
September 29.5 °C 232 mm 89 %
October 29.6 °C 197 mm 77 %
November 30.1 °C 42 mm 56 %
December 29.9 °C 11 mm 50 %

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.