Monthly Climate
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Best time to visit Hamilton

May is the best time to visit Hamilton for general sightseeing, with average highs of 22 °C and about 9 wet days. The comfortable season runs roughly November to June. The sea stays above 20 °C from May to January.

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 May comfort 78/100
A beach holiday June sea 24 °C
The least cloud July 50 % average cloud cover
The least rain April 82 mm
Warmth August 27 °C
Cooler weather March 19 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 May 78 22 °C 9 66
2 December 77 21 °C 10 61
3 April 77 20 °C 10 53
4 November 75 22 °C 11 70
5 January 74 20 °C 13 48
6 March 73 19 °C 12 43
7 February 73 19 °C 12 44
8 June 69 24 °C 12 76
9 October 66 25 °C 13 75
10 September 58 26 °C 14 74
11 July 58 27 °C 15 74
12 August 54 27 °C 16 73

For a beach holiday

June scores highest, with a sea temperature of 24 °C and air temperatures around 24 °C. The sea is above 20 °C from May to January.

Month Sea Air Sunshine Beach score
January 20 °C 20 °C 71 % 48
February 20 °C 19 °C 69 % 44
March 19 °C 19 °C 65 % 43
April 20 °C 20 °C 58 % 53
May 22 °C 22 °C 57 % 66
June 24 °C 24 °C 58 % 76
July 27 °C 27 °C 50 % 74
August 28 °C 27 °C 50 % 73
September 27 °C 26 °C 56 % 74
October 26 °C 25 °C 63 % 75
November 24 °C 22 °C 63 % 70
December 22 °C 21 °C 68 % 61

When to think twice

August scores lowest with about 16 wet days and highs near 27 °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 19.5 °C 106 mm 71 %
February 19.1 °C 101 mm 69 %
March 18.8 °C 110 mm 65 %
April 19.7 °C 82 mm 58 %
May 21.6 °C 87 mm 57 %
June 24.4 °C 109 mm 58 %
July 26.5 °C 106 mm 50 %
August 27.1 °C 125 mm 50 %
September 26.5 °C 137 mm 56 %
October 24.7 °C 142 mm 63 %
November 22.4 °C 98 mm 63 %
December 20.7 °C 99 mm 68 %

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.