Average September Rainfall for New Zealand

The tables below list monthly averages for rainfall during September 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 September
Days	Place	Inches	Millimetres
12	Auckland	3.9	100
11	Cape Reinga	3.2	81
9	Gisborne	2.8	71
14	Great Barrier Island	5.2	132
13	Hamilton	3.9	100
14	Kaikohe	4.9	124
13	Kaitaia	4.8	122
14	Kerikeri	6.3	159
10	Masterton	2.9	73
7	Napier	2.3	58
14	New Plymouth	4.8	123
12	Palmerston North	3.5	89
11	Rotorua	4.2	107
11	Taupo	3.1	79
11	Tauranga	3.4	87
12	Thames	3.6	92
12	Waiheke Island	4.2	107
12	Wellington	4.3	108
17	Whakapapa Village, Tongariro	11.1	283
11	Whangaparaoa	3.4	88
13	Whangarei	4.4	112
13	Whitianga	6.5	165
11	Whanganui	3.0	76

South Island

September averages for total rainfall
Days	Place	Inches	Millimetres
8	Akaroa	2.9	75
17	Arthur's Pass	17.8	453
7	Blenheim	2.1	54
6	Christchurch	1.6	40
8	Dunedin	1.9	47
12	Farewell Spit	4.5	116
17	Franz Josef	20.5	520
17	Greymouth	7.9	202
14	Invercargill	3.5	90
7	Kaikoura	2.1	54
14	Lake Rotoiti	6.1	154
7	Lake Tekapo	1.3	34
12	Manapouri	4.2	106
17	Milford Sound	21.3	541
15	Mt Cook	14.2	361
10	Nelson	3.3	85
9	Queenstown	3.2	81
19	Secretary Island	12.4	315
6	Timaru	1.3	34
17	Westport	7.2	183

Other Islands

Rainfall averages for September
Days	Place	Inches	Millimetres
16	Auckland Islands	3.4	87
21	Campbell Island	4.4	113
12	Chatham Island	2.8	71
11	Raoul Island	4.5	113
16	Stewart Island, Oban	4.8	123

Average September Rainfall for New Zealand

North Island

South Island

Other Islands

Reference

More on Weather in New Zealand