Willetton weather in September

In September, Willetton sees average daytime highs of 19°C and overnight lows near 9°C, with 60 mm of rain across 8.7 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 5th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 20°C by the end. The sky is clear or mostly clear about 37% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 18 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Willetton's 9th-clearest and 7th-windiest month. For the whole year in context, see Willetton's year-round climate.

Daytime high
19°
9th warmest
Overnight low
3rd coldest
Rainfall
60 mm
8.7 wet days
Daylight
11 h 48 min
6:17 AM – 6:05 PM
Cloud cover
48%
9th clearest
Wind
14 km/h
7th windiest
Solar energy
4.72 kWh/m²
Travel score
6.4
out of 10

Willetton is suburb of Perth, Western Australia.

Density
2,214/km²
people per km²

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 18°C in the first days to 20°C by the end.

A typical September day in Willetton reaches about 19°C in the afternoon and slips back to 9°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 23°C. Set against its neighbours, September runs about 2°C warmer than August and about 3°C cooler than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
1189
2189
3189
4189
5189
6189
7189
8189
9189
10189
11189
12199
13199
14199
15199
16199
17199
18199
191910
201910
211910
221910
231910
241910
251910
262010
272010
282010
292010
302010

Willetton weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 18°192.113.95.7
Feb31° / 19°171.713.25.7
Mar29° / 17°182.712.27.0
Apr25° / 14°26411.28.0
May21° / 11°62710.47.1
Jun18° / 87109.96.0
Jul17° / 9611.610.15.3
Aug17° / 8710.710.85.7
Sep19° / 608.711.86.4
Oct22° / 11°29512.87.8
Nov26° / 14°22413.68.1
Dec29° / 16°111.914.17.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 24% of September, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16238
26238
36238
46238
56238
66238
76238
86238
96139
106040
116040
126040
136139
146139
156139
166139
176040
186040
196040
206139
216139
226040
236040
246040
256040
266040
276040
286238
296238
306238

Chance of precipitation in September

Any precipitation

Willetton gets around 60 mm of rain over 8.7 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 29% and peaks near 34% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
134
234
334
434
534
633
733
832
931
1031
1130
1230
1329
1429
1528
1628
1728
1827
1927
2027
2126
2226
2326
2425
2525
2624
2723
2823
2922
3022

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 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1964
2964
3964
4964
5964
6964
7964
8964
9955
10955
11955
12955
13955
14955
15946
16946
17946
18946
19955
20955
21955
22955
23955
24955
25955
26955
27955
28955
29946
30946

Wind in September

Winds average 14 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 18 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over September. Sunrise moves from 6:37 AM to 5:57 AM, and sunset from 5:55 PM to 6:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.36:375:55
211.36:365:56
311.46:345:57
411.46:335:57
511.46:325:58
611.56:305:59
711.56:295:59
811.56:286:00
911.66:266:01
1011.66:256:01
1111.66:236:02
1211.76:226:02
1311.76:216:03
1411.76:196:04
1511.86:186:04
1611.86:176:05
1711.86:156:06
1811.96:146:06
1911.96:126:07
2011.96:116:08
2112.06:106:08
2212.06:086:09
2312.06:076:09
2412.16:066:10
2512.16:046:11
2612.16:036:11
2712.26:016:12
2812.26:006:13
2912.25:596:13
3012.35:576:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.72 kWh/m².

For context, solar energy here swings from a low near 2.55 kWh/m² to a high of 8.36 kWh/m² in December across the year — September's 4.72 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.2Bright
44.2Bright
54.2Bright
64.3Bright
74.3Bright
84.4Bright
94.4Bright
104.5Bright
114.5Bright
124.6Bright
134.6Bright
144.7Bright
154.7Bright
164.8Bright
174.8Bright
184.9Bright
194.9Bright
205.0Bright
215.0Bright
225.1Bright
235.1Bright
245.2Bright
255.2Bright
265.3Bright
275.3Bright
285.4Bright
295.4Bright
305.5Bright
Planning a trip in September

Hazard calendar for Willetton

In seasonPeak

In September, Willetton sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Willetton sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Willetton's rainy season runs May–September, when most of the year's rain falls.

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

Is September a good time to visit Willetton?

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

6.4
Sightseeing
7th-best month of the year
2.7
Beach & pool
9th-best month of the year

September is a reasonable time to visit Willetton for sightseeing.

What to pack for Willetton in September

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

In September, Willetton sees daytime highs around 19°C and nights near 9°C. Worth packing: rain gear and sun protection. About 9 days see rain.

rain gearsun protection

Sea temperature near Willetton in September

The nearest coast averages about 19°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 26 km away) is warmest in February at about 22°C and coldest in September near 19°C.

It's comfortable for a long swim from Nov 26 to Jul 9 — about 7.4 months when the water holds above 20°C.

18°20°22°24°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar22Refreshing
Apr22Refreshing
May22Refreshing
Jun21Refreshing
Jul20Cool
Aug19Cool
Sep19Cool
Oct19Cool
Nov20Cool
Dec21Refreshing

UV index in Willetton in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Willetton peaks around December 23 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeModerateVery highExtremeDec 23UV 13Jun 21UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar11Extreme
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug5Moderate
Sep8Very high
Oct9Very high
Nov10Extreme
Dec13Extreme

Air quality in Willetton in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Willetton is worst in May — around 18 µg/m³ PM2.5 (moderate), about 4.4× the cleanest month (December, 4 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodMay 1517 µg/m³Dec 185 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb7Good
Mar5Good
Apr10Good
May18Moderate
Jun8Good
Jul6Good
Aug7Good
Sep15Moderate
Oct15Moderate
Nov10Good
Dec4Good
Location & terrain

Where is Willetton?

Willetton sits at 32.1°S, 115.9°E, 22 m above sea level, in Australia. The nearest listed city is Canning Vale, 3.0 km away.

Topography around Willetton

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

Within 3 km, the terrain around Willetton has only modest variations in elevation — a maximum elevation change of 46 m around an average of 19 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 311 m; within 80 km, significant variations in elevation — a maximum elevation change of 567 m.

The land around Willetton is covered by artificial surfaces (75%) within 3 km, artificial surfaces (48%) and trees (24%) within 16 km, and trees (43%) and water (31%) within 80 km.

3 km
46 m
16 km
311 m
80 km
567 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Canning Vale 3.0 km · Thornlie 6.0 km · Perth 11 km · Gosnells 12 km · Dianella 18 km · Morley 18 km · Scarborough 21 km · Byford 22 km

Australia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type I
230 V · 50 Hz
Prices
≈ 90% of US
price level, 2025
GDP per capita
$65,130
2025
Happiness
6.9 / 10
World Happiness, 2025
Homicide rate
0.9
per 100k, 2023
Road deaths
4.9
per 100k/yr, 2019
Income group
High
World Bank
Religion
none 38%Roman Catholic 20%Protestant 18%other Christian 4%

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 Willetton (-32.0525°, 115.8878°, elevation 22 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).