Average August Rainfall for New Zealand

The tables below list monthly averages for rainfall during August at cities, towns, beaches and islands throughout New Zealand.

Each place has a total for how many days of wet weather it usually gets a year and for the normal amount of precipitation. The calculation of days only includes the days when rain totalled at least one millimetre (0.04 inches).

The month's precipitation statistics are long-term historical averages of weather data collected during 1991 to 2020.

North Island

Average monthly precipitation in August
Days Place Inches Milli­metres
15 Auckland 4.6 117
15 Cape Reinga 4.0 101
11 Gisborne 3.4 87
16 Great Barrier Island 7.0 178
14 Hamilton 4.2 107
17 Kaikohe 6.4 162
16 Kaitaia 5.4 137
16 Kerikeri 7.3 186
13 Masterton 3.2 82
8 Napier 2.2 57
15 New Plymouth 5.1 129
13 Palmerston North 3.3 84
12 Rotorua 4.9 125
12 Taupo 3.5 89
12 Tauranga 4.4 112
14 Thames 4.9 125
15 Waiheke Island 5.3 135
12 Wellington 5.5 139
18 Whakapapa Village, Tongariro 10.2 259
13 Whangaparaoa 3.4 87
15 Whangarei 5.1 130
16 Whitianga 7.3 186
12 Whanganui 3.4 87

South Island

August averages for total rainfall
Days Place Inches Milli­metres
10 Akaroa 4.3 110
16 Arthur's Pass 13.9 353
8 Blenheim 2.3 58
8 Christchurch 2.3 58
9 Dunedin 2.2 55
13 Farewell Spit 4.4 111
15 Franz Josef 16.8 427
16 Greymouth 8.0 204
11 Invercargill 2.5 63
7 Kaikoura  2.3 59
13 Lake Rotoiti 5.5 139
7 Lake Tekapo 1.5 38
11 Manapouri 3.2 82
16 Milford Sound 18.0 457
14 Mt Cook 11.2 284
9 Nelson 3.3 84
8 Queenstown 3.2 82
19 Secretary Island 10.2 258
6 Timaru 1.8 45
16 Westport 7.4 187

Other Islands

Rainfall averages for August
Days Place Inches Milli­metres
16 Auckland Islands 2.7 68
22 Campbell Island 4.3 108
14 Chatham Island 2.8 71
14 Raoul Island  5.2 132
18 Stewart Island, Oban 4.6 116
Reference

NIWA (New Zealand National Institute of Water and Atmospheric Research). The National Climate Database.

New Zealand Rainfall
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