Whanganui weather in September

In September, Whanganui sees average daytime highs of 13°C and overnight lows near 10°C, with 97 mm of rain across 13.6 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 13°C through the month. The sky is clear or mostly clear about 31% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 06 min at the start of September to 12 h 24 min by month's end. Set against the rest of the year, September is Whanganui's 8th-clearest and 3rd-windiest month. For the whole year in context, see Whanganui's year-round climate.

Daytime high: 13°; 9th warmest
Overnight low: 10°; 4th coldest
Rainfall: 97 mm; 13.6 wet days
Daylight: 11 h 42 min; 7:22 AM – 7:06 PM
Cloud cover: 58%; 8th clearest
Wind: 23 km/h; 3rd windiest
Solar energy: 3.75 kWh/m²
Travel score: 3.4; out of 10

Whanganui is city in New Zealand's North Island.

Density: 20,736/km²; people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Whanganui year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 13°C through the month.

A typical September day in Whanganui reaches about 13°C in the afternoon and slips back to 10°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 15°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	14	14	14	14	14
Avg low (°C)	9	9	9	9	9	9	9	9	9	9	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10

	Avg high (°C)	Avg low (°C)
1	13	9
2	13	9
3	13	9
4	13	9
5	13	9
6	13	9
7	13	9
8	13	9
9	13	9
10	13	9
11	13	10
12	13	10
13	13	10
14	13	10
15	13	10
16	13	10
17	13	10
18	13	10
19	13	10
20	13	10
21	13	10
22	13	10
23	13	10
24	13	10
25	13	10
26	14	10
27	14	10
28	14	10
29	14	10
30	14	10

Whanganui weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 7th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	19° / 15°	71	9.3	14.5	6.3
Feb	20° / 16°	66	8.1	13.6	6.5
Mar	18° / 15°	68	9.6	12.3	6.2
Apr	17° / 13°	98	11	11	5.2
May	15° / 11°	97	12.4	9.8	4.3
Jun	13° / 10°	109	14.1	9.2	3.2
Jul	12° / 9°	105	14.3	9.5	2.9
Aug	12° / 9°	102	14.7	10.4	3.0
Sep	13° / 10°	97	13.6	11.7	3.4
Oct	14° / 11°	107	14.2	13.1	3.8
Nov	16° / 12°	89	12.2	14.2	4.6
Dec	17° / 14°	100	12.7	14.8	5.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 48%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	54	54	53	53	52	52	51	51	50	51	50	50	51	51	51	51	53	53	53	53	53	54	53	53	53	53	53	53	51	51
Cloudier (%)	46	46	47	47	48	48	49	49	50	49	50	50	49	49	49	49	47	47	47	47	47	46	47	47	47	47	47	47	49	49

	Clearer (%)	Cloudier (%)
1	54	46
2	54	46
3	53	47
4	53	47
5	52	48
6	52	48
7	51	49
8	51	49
9	50	50
10	51	49
11	50	50
12	50	50
13	51	49
14	51	49
15	51	49
16	51	49
17	53	47
18	53	47
19	53	47
20	53	47
21	53	47
22	54	46
23	53	47
24	53	47
25	53	47
26	53	47
27	53	47
28	53	47
29	51	49
30	51	49

Chance of precipitation in September

Any precipitation

Whanganui gets around 97 mm of rain over 13.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 45% and peaks near 49% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	41	41	41	41	41	41	42	42	43	43	44	44	45	45	45	46	46	47	47	47	48	48	48	48	49	49	49	49	49	49

	Rain chance (%)
1	41
2	41
3	41
4	41
5	41
6	41
7	42
8	42
9	43
10	43
11	44
12	44
13	45
14	45
15	45
16	46
17	46
18	47
19	47
20	47
21	48
22	48
23	48
24	48
25	49
26	49
27	49
28	49
29	49
30	49

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	99	99	99	99
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	99	1
28	99	1
29	99	1
30	99	1

Wind in September

Winds average 23 km/h in September.

Across September, daily wind ranges from about 22 km/h on the calmest days to 25 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	22	22	22	22	22	22	22	23	23	23	23	23	23	23	23	23	24	24	24	24	24	24	24	24	24	24	24	24	24	25
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

	Wind speed (km/h)	Feels
1	22	breezy
2	22	breezy
3	22	breezy
4	22	breezy
5	22	breezy
6	22	breezy
7	22	breezy
8	23	breezy
9	23	breezy
10	23	breezy
11	23	breezy
12	23	breezy
13	23	breezy
14	23	breezy
15	23	breezy
16	23	breezy
17	24	breezy
18	24	breezy
19	24	breezy
20	24	breezy
21	24	breezy
22	24	breezy
23	24	breezy
24	24	breezy
25	24	breezy
26	24	breezy
27	24	breezy
28	24	breezy
29	24	breezy
30	25	breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 06 min at the start of September to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 78 minutes over September. Sunrise moves from 7:47 AM to 6:58 AM, and sunset from 6:52 PM to 7:20 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	11.1	11.1	11.2	11.2	11.3	11.3	11.3	11.4	11.4	11.5	11.5	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.9	11.9	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.3	12.3	12.4
Sunrise (AM)	7:47	7:46	7:44	7:42	7:41	7:39	7:37	7:36	7:34	7:32	7:30	7:29	7:27	7:25	7:24	7:22	7:20	7:18	7:17	7:15	7:13	7:12	7:10	7:08	7:06	7:05	7:03	7:01	7:00	6:58
Sunset (PM)	6:52	6:53	6:54	6:55	6:56	6:57	6:58	6:59	7:00	7:01	7:02	7:02	7:03	7:04	7:05	7:06	7:07	7:08	7:09	7:10	7:11	7:12	7:13	7:14	7:15	7:16	7:17	7:18	7:19	7:20

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.1	7:47	6:52
2	11.1	7:46	6:53
3	11.2	7:44	6:54
4	11.2	7:42	6:55
5	11.3	7:41	6:56
6	11.3	7:39	6:57
7	11.3	7:37	6:58
8	11.4	7:36	6:59
9	11.4	7:34	7:00
10	11.5	7:32	7:01
11	11.5	7:30	7:02
12	11.6	7:29	7:02
13	11.6	7:27	7:03
14	11.7	7:25	7:04
15	11.7	7:24	7:05
16	11.7	7:22	7:06
17	11.8	7:20	7:07
18	11.8	7:18	7:08
19	11.9	7:17	7:09
20	11.9	7:15	7:10
21	12.0	7:13	7:11
22	12.0	7:12	7:12
23	12.1	7:10	7:13
24	12.1	7:08	7:14
25	12.1	7:06	7:15
26	12.2	7:05	7:16
27	12.2	7:03	7:17
28	12.3	7:01	7:18
29	12.3	7:00	7:19
30	12.4	6:58	7:20

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.75 kWh/m².

For context, solar energy here swings from a low near 1.64 kWh/m² to a high of 7 kWh/m² in January across the year — September's 3.75 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	3.2	3.3	3.3	3.3	3.4	3.4	3.4	3.5	3.5	3.6	3.6	3.6	3.7	3.7	3.8	3.8	3.8	3.9	3.9	4.0	4.0	4.0	4.1	4.1	4.1	4.2	4.2	4.3	4.3	4.3
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.2	Moderate
2	3.3	Moderate
3	3.3	Moderate
4	3.3	Moderate
5	3.4	Moderate
6	3.4	Moderate
7	3.4	Moderate
8	3.5	Moderate
9	3.5	Moderate
10	3.6	Moderate
11	3.6	Moderate
12	3.6	Moderate
13	3.7	Moderate
14	3.7	Moderate
15	3.8	Moderate
16	3.8	Moderate
17	3.8	Moderate
18	3.9	Moderate
19	3.9	Moderate
20	4.0	Moderate
21	4.0	Moderate
22	4.0	Bright
23	4.1	Bright
24	4.1	Bright
25	4.1	Bright
26	4.2	Bright
27	4.2	Bright
28	4.3	Bright
29	4.3	Bright
30	4.3	Bright

Planning a trip in September

Is September a good time to visit Whanganui?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.4

Sightseeing

9th-best month of the year

0.0

Beach & pool

9th-best month of the year

September is a weaker month for outdoor sightseeing in Whanganui.

What to pack for Whanganui in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Whanganui sees daytime highs around 13°C and nights near 10°C. Pack rain gear. Worth having: a warm layer and a windbreaker. About 14 days see rain.

rain geara warm layera windbreaker

Sea temperature near Whanganui in September

The nearest coast averages about 13°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in February at about 19°C and coldest in August near 13°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	18	19	18	17	16	14	13	13	13	14	15	16
Comfort	Cool	Cool	Cool	Cool	Cool	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool

	Sea temperature (°C)	Comfort
Jan	18	Cool
Feb	19	Cool
Mar	18	Cool
Apr	17	Cool
May	16	Cool
Jun	14	Bracing
Jul	13	Bracing
Aug	13	Bracing
Sep	13	Bracing
Oct	14	Bracing
Nov	15	Bracing
Dec	16	Cool

UV index in Whanganui in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Whanganui peaks around January 12 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	12	11	7	5	2	2	2	3	4	7	10	11
Level	Extreme	Extreme	High	Moderate	Moderate	Low	Moderate	Moderate	Moderate	High	Very high	Extreme

	UV index (midday)	Level
Jan	12	Extreme
Feb	11	Extreme
Mar	7	High
Apr	5	Moderate
May	2	Moderate
Jun	2	Low
Jul	2	Moderate
Aug	3	Moderate
Sep	4	Moderate
Oct	7	High
Nov	10	Very high
Dec	11	Extreme

Location & terrain

Where is Whanganui?

Whanganui sits at 39.9°S, 175.1°E, 18 m above sea level, in New Zealand. The nearest listed city is Palmerston North, 67 km away.

Topography around Whanganui

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Whanganui.

Within 3 km, the terrain around Whanganui has only modest variations in elevation — a maximum elevation change of 103 m around an average of 28 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 300 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,746 m.

The land around Whanganui is covered by grassland (39%), artificial surfaces (28%) and trees (25%) within 3 km, grassland (42%), water (32%) and trees (22%) within 16 km, and grassland (44%), trees (29%) and water (25%) within 80 km.

3 km

103 m

grassland 39%

16 km

300 m

grassland 42%

80 km

1,746 m

grassland 44%

treesgrasslandcroplandartificial surfaceswater

← August Whanganui year-round climate October →Best places to visit in September

September weather nearby: Palmerston North 67 km · Levin 80 km · Paraparaumu 109 km · Masterton 125 km · New Plymouth 127 km · Upper Hutt 134 km · Porirua 135 km · Lower Hutt 143 km

New Zealand travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type I; 230 V · 50 Hz
Prices: ≈ 86% of US; price level, 2025
GDP per capita: $49,591; 2025
Happiness: 7.0 / 10; World Happiness, 2025
Safe drinking water: 100%; of population, 2024
Homicide rate: 1.5; per 100k, 2022
Road deaths: 9.6; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Whanganui (-39.9333°, 175.05°, elevation 18 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	13	9
2	13	9
3	13	9
4	13	9
5	13	9
6	13	9
7	13	9
8	13	9
9	13	9
10	13	9
11	13	10
12	13	10
13	13	10
14	13	10
15	13	10
16	13	10
17	13	10
18	13	10
19	13	10
20	13	10
21	13	10
22	13	10
23	13	10
24	13	10
25	13	10
26	14	10
27	14	10
28	14	10
29	14	10
30	14	10

	Clearer (%)	Cloudier (%)
1	54	46
2	54	46
3	53	47
4	53	47
5	52	48
6	52	48
7	51	49
8	51	49
9	50	50
10	51	49
11	50	50
12	50	50
13	51	49
14	51	49
15	51	49
16	51	49
17	53	47
18	53	47
19	53	47
20	53	47
21	53	47
22	54	46
23	53	47
24	53	47
25	53	47
26	53	47
27	53	47
28	53	47
29	51	49
30	51	49

	Rain chance (%)
1	41
2	41
3	41
4	41
5	41
6	41
7	42
8	42
9	43
10	43
11	44
12	44
13	45
14	45
15	45
16	46
17	46
18	47
19	47
20	47
21	48
22	48
23	48
24	48
25	49
26	49
27	49
28	49
29	49
30	49

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	99	1
28	99	1
29	99	1
30	99	1

	Avg high (°C)	Avg low (°C)
1	13	9
2	13	9
3	13	9
4	13	9
5	13	9
6	13	9
7	13	9
8	13	9
9	13	9
10	13	9
11	13	10
12	13	10
13	13	10
14	13	10
15	13	10
16	13	10
17	13	10
18	13	10
19	13	10
20	13	10
21	13	10
22	13	10
23	13	10
24	13	10
25	13	10
26	14	10
27	14	10
28	14	10
29	14	10
30	14	10

	Clearer (%)	Cloudier (%)
1	54	46
2	54	46
3	53	47
4	53	47
5	52	48
6	52	48
7	51	49
8	51	49
9	50	50
10	51	49
11	50	50
12	50	50
13	51	49
14	51	49
15	51	49
16	51	49
17	53	47
18	53	47
19	53	47
20	53	47
21	53	47
22	54	46
23	53	47
24	53	47
25	53	47
26	53	47
27	53	47
28	53	47
29	51	49
30	51	49

	Rain chance (%)
1	41
2	41
3	41
4	41
5	41
6	41
7	42
8	42
9	43
10	43
11	44
12	44
13	45
14	45
15	45
16	46
17	46
18	47
19	47
20	47
21	48
22	48
23	48
24	48
25	49
26	49
27	49
28	49
29	49
30	49

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	99	1
28	99	1
29	99	1
30	99	1

	Avg high (°C)	Avg low (°C)
1	13	9
2	13	9
3	13	9
4	13	9
5	13	9
6	13	9
7	13	9
8	13	9
9	13	9
10	13	9
11	13	10
12	13	10
13	13	10
14	13	10
15	13	10
16	13	10
17	13	10
18	13	10
19	13	10
20	13	10
21	13	10
22	13	10
23	13	10
24	13	10
25	13	10
26	14	10
27	14	10
28	14	10
29	14	10
30	14	10

	Clearer (%)	Cloudier (%)
1	54	46
2	54	46
3	53	47
4	53	47
5	52	48
6	52	48
7	51	49
8	51	49
9	50	50
10	51	49
11	50	50
12	50	50
13	51	49
14	51	49
15	51	49
16	51	49
17	53	47
18	53	47
19	53	47
20	53	47
21	53	47
22	54	46
23	53	47
24	53	47
25	53	47
26	53	47
27	53	47
28	53	47
29	51	49
30	51	49

	Rain chance (%)
1	41
2	41
3	41
4	41
5	41
6	41
7	42
8	42
9	43
10	43
11	44
12	44
13	45
14	45
15	45
16	46
17	46
18	47
19	47
20	47
21	48
22	48
23	48
24	48
25	49
26	49
27	49
28	49
29	49
30	49

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	99	1
28	99	1
29	99	1
30	99	1