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

Average August Rainfall for New Zealand

North Island

South Island

Other Islands

Reference

More on Weather in New Zealand