Perth weather in September

In September, Perth sees average daytime highs of 19°C and overnight lows near 12°C, with 55 mm of rain across 8.5 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 19°C through the month. The sky is clear or mostly clear about 40% 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 Perth's 9th-clearest and 7th-windiest month. For the whole year in context, see Perth's year-round climate.

Daytime high: 19°; 9th warmest
Overnight low: 12°; 3rd coldest
Rainfall: 55 mm; 8.5 wet days
Daylight: 11 h 48 min; 6:17 AM – 6:05 PM
Cloud cover: 47%; 9th clearest
Wind: 18 km/h; 7th windiest
Solar energy: 4.82 kWh/m²
Travel score: 6.5; out of 10

Perth is capital city of Western Australia, Australia.

Air quality: Good; PM2.5 6.8 µg/m³ · 2019
Density: 372/km²; people per km²
Founded: 1829

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

← August Perth 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 19°C through the month.

A typical September day in Perth reaches about 19°C in the afternoon and slips back to 12°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 22°C. Set against its neighbours, September runs about 1°C warmer than August and about 3°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)	18	18	18	18	18	18	18	18	18	18	18	18	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19
Avg low (°C)	11	11	11	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12

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

Perth 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	29° / 19°	17	1.8	13.9	7.4
Feb	29° / 20°	17	1.5	13.2	7.2
Mar	27° / 19°	18	2.3	12.2	7.8
Apr	24° / 16°	24	4.1	11.2	8.1
May	21° / 14°	67	7.8	10.4	7.1
Jun	18° / 12°	98	10.7	10	6.1
Jul	17° / 11°	102	12.5	10.1	5.5
Aug	18° / 11°	89	11.1	10.8	5.8
Sep	19° / 12°	55	8.5	11.8	6.5
Oct	21° / 13°	27	4.7	12.8	7.6
Nov	24° / 16°	19	3.7	13.6	8.4
Dec	27° / 18°	9	1.6	14.1	8.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% 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 36%. Skies tend to open up as the month goes on.

	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 (%)	66	66	66	66	65	65	65	65	65	65	65	64	63	63	63	63	64	63	63	62	62	63	62	63	63	64	64	65	65	66
Cloudier (%)	34	34	34	34	35	35	35	35	35	35	35	36	37	37	37	37	36	37	37	38	38	37	38	37	37	36	36	35	35	34

	Clearer (%)	Cloudier (%)
1	66	34
2	66	34
3	66	34
4	66	34
5	65	35
6	65	35
7	65	35
8	65	35
9	65	35
10	65	35
11	65	35
12	64	36
13	63	37
14	63	37
15	63	37
16	63	37
17	64	36
18	63	37
19	63	37
20	62	38
21	62	38
22	63	37
23	62	38
24	63	37
25	63	37
26	64	36
27	64	36
28	65	35
29	65	35
30	66	34

Chance of precipitation in September

Any precipitation

Perth gets around 55 mm of rain over 8.5 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 28% and peaks near 35% on the wettest days. The odds ease 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 (%)	35	35	35	35	34	33	33	32	31	30	29	29	28	27	27	26	26	25	25	25	24	24	24	24	24	23	23	23	22	21

	Rain chance (%)
1	35
2	35
3	35
4	35
5	34
6	33
7	33
8	32
9	31
10	30
11	29
12	29
13	28
14	27
15	27
16	26
17	26
18	25
19	25
20	25
21	24
22	24
23	24
24	24
25	24
26	23
27	23
28	23
29	22
30	21

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 90% 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 (%)	93	93	93	93	92	92	92	92	91	91	91	90	90	90	89	89	89	89	89	89	89	89	89	90	90	90	90	90	89	89
Comfortable (%)	7	7	7	7	8	8	8	8	9	9	9	10	10	10	11	11	11	11	11	11	11	11	11	10	10	10	10	10	11	11

	Dry (%)	Comfortable (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	92	8
6	92	8
7	92	8
8	92	8
9	91	9
10	91	9
11	91	9
12	90	10
13	90	10
14	90	10
15	89	11
16	89	11
17	89	11
18	89	11
19	89	11
20	89	11
21	89	11
22	89	11
23	89	11
24	90	10
25	90	10
26	90	10
27	90	10
28	90	10
29	89	11
30	89	11

Wind in September

Winds average 18 km/h in September.

Across September, daily wind ranges from about 17 km/h on the calmest days to 18 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)	17	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	18	18	18	18	18	17	17	17	17	17	17	17
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	17	light breeze
2	17	light breeze
3	17	light breeze
4	17	light breeze
5	17	light breeze
6	17	light breeze
7	17	light breeze
8	17	light breeze
9	17	light breeze
10	17	light breeze
11	18	light breeze
12	18	light breeze
13	18	light breeze
14	18	light breeze
15	18	light breeze
16	18	light breeze
17	18	light breeze
18	18	light breeze
19	18	light breeze
20	18	light breeze
21	18	light breeze
22	18	light breeze
23	18	light breeze
24	17	light breeze
25	17	light breeze
26	17	light breeze
27	17	light breeze
28	17	light breeze
29	17	light breeze
30	17	light 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 5:58 AM, and sunset from 5:56 PM to 6:14 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)	11.3	11.3	11.4	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.8	11.9	11.9	11.9	12.0	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.2	12.3
Sunrise (AM)	6:37	6:36	6:34	6:33	6:32	6:30	6:29	6:28	6:26	6:25	6:24	6:22	6:21	6:19	6:18	6:17	6:15	6:14	6:13	6:11	6:10	6:08	6:07	6:06	6:04	6:03	6:02	6:00	5:59	5:58
Sunset (PM)	5:56	5:56	5:57	5:58	5:58	5:59	5:59	6:00	6:01	6:01	6:02	6:03	6:03	6:04	6:04	6:05	6:06	6:06	6:07	6:08	6:08	6:09	6:10	6:10	6:11	6:12	6:12	6:13	6:13	6:14

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	6:37	5:56
2	11.3	6:36	5:56
3	11.4	6:34	5:57
4	11.4	6:33	5:58
5	11.4	6:32	5:58
6	11.5	6:30	5:59
7	11.5	6:29	5:59
8	11.5	6:28	6:00
9	11.6	6:26	6:01
10	11.6	6:25	6:01
11	11.6	6:24	6:02
12	11.7	6:22	6:03
13	11.7	6:21	6:03
14	11.7	6:19	6:04
15	11.8	6:18	6:04
16	11.8	6:17	6:05
17	11.8	6:15	6:06
18	11.9	6:14	6:06
19	11.9	6:13	6:07
20	11.9	6:11	6:08
21	12.0	6:10	6:08
22	12.0	6:08	6:09
23	12.0	6:07	6:10
24	12.1	6:06	6:10
25	12.1	6:04	6:11
26	12.1	6:03	6:12
27	12.2	6:02	6:12
28	12.2	6:00	6:13
29	12.2	5:59	6:13
30	12.3	5:58	6:14

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.82 kWh/m².

For context, solar energy here swings from a low near 2.58 kWh/m² to a high of 8.43 kWh/m² in December across the year — September's 4.82 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)	4.2	4.2	4.2	4.3	4.3	4.4	4.4	4.5	4.5	4.6	4.6	4.7	4.7	4.8	4.8	4.9	4.9	5.0	5.0	5.1	5.1	5.2	5.2	5.3	5.3	5.4	5.4	5.5	5.5	5.6
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.2	Bright
2	4.2	Bright
3	4.2	Bright
4	4.3	Bright
5	4.3	Bright
6	4.4	Bright
7	4.4	Bright
8	4.5	Bright
9	4.5	Bright
10	4.6	Bright
11	4.6	Bright
12	4.7	Bright
13	4.7	Bright
14	4.8	Bright
15	4.8	Bright
16	4.9	Bright
17	4.9	Bright
18	5.0	Bright
19	5.0	Bright
20	5.1	Bright
21	5.1	Bright
22	5.2	Bright
23	5.2	Bright
24	5.3	Bright
25	5.3	Bright
26	5.4	Bright
27	5.4	Bright
28	5.5	Bright
29	5.5	Bright
30	5.6	Bright

Planning a trip in September

Hazard calendar for Perth

In seasonPeak

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

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

Perth'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 Perth?

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

6.5

Sightseeing

9th-best month of the year

2.6

Beach & pool

9th-best month of the year

September is a reasonable time to visit Perth for sightseeing.

What to pack for Perth in September

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

In September, Perth sees daytime highs around 19°C and nights near 12°C. Worth packing: rain gear and sun protection. About 9 days see rain.

rain gearsun protection

Sea temperature near Perth 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 24 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 22 to Jul 12 — about 7.7 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	22	22	22	22	22	21	20	19	19	19	20	21
Comfort	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Cool	Cool	Cool	Cool	Cool	Refreshing

	Sea temperature (°C)	Comfort
Jan	22	Refreshing
Feb	22	Refreshing
Mar	22	Refreshing
Apr	22	Refreshing
May	22	Refreshing
Jun	21	Refreshing
Jul	20	Cool
Aug	19	Cool
Sep	19	Cool
Oct	19	Cool
Nov	20	Cool
Dec	21	Refreshing

UV index in Perth 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 Perth 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	12	11	6	4	3	3	5	8	9	10	13
Level	Extreme	Extreme	Extreme	High	Moderate	Moderate	Moderate	Moderate	Very high	Very high	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	12	Extreme
Mar	11	Extreme
Apr	6	High
May	4	Moderate
Jun	3	Moderate
Jul	3	Moderate
Aug	5	Moderate
Sep	8	Very high
Oct	9	Very high
Nov	10	Extreme
Dec	13	Extreme

Location & terrain

Where is Perth?

Perth sits at 32.0°S, 115.9°E, 34 m above sea level, in Australia. The nearest listed city is Dianella, 7.0 km away.

Topography around Perth

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

Within 3 km, the terrain around Perth has only modest variations in elevation — a maximum elevation change of 73 m around an average of 18 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 139 m; within 80 km, significant variations in elevation — a maximum elevation change of 564 m.

The land around Perth is covered by artificial surfaces (55%) and water (20%) within 3 km, artificial surfaces (56%) within 16 km, and trees (41%) and water (32%) within 80 km.

3 km

73 m

artificial surfaces 55%

16 km

139 m

artificial surfaces 56%

80 km

564 m

trees 41%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Dianella 7.0 km · Morley 8.0 km · Scarborough 11 km · Willetton 11 km · Ballajura 13 km · Canning Vale 13 km · Thornlie 15 km · Duncraig 16 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

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 Perth (-31.9522°, 115.8614°, elevation 34 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. 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	18	11
2	18	11
3	18	11
4	18	12
5	18	12
6	18	12
7	18	12
8	18	12
9	18	12
10	18	12
11	18	12
12	18	12
13	19	12
14	19	12
15	19	12
16	19	12
17	19	12
18	19	12
19	19	12
20	19	12
21	19	12
22	19	12
23	19	12
24	19	12
25	19	12
26	19	12
27	19	12
28	19	12
29	19	12
30	19	12

	Clearer (%)	Cloudier (%)
1	66	34
2	66	34
3	66	34
4	66	34
5	65	35
6	65	35
7	65	35
8	65	35
9	65	35
10	65	35
11	65	35
12	64	36
13	63	37
14	63	37
15	63	37
16	63	37
17	64	36
18	63	37
19	63	37
20	62	38
21	62	38
22	63	37
23	62	38
24	63	37
25	63	37
26	64	36
27	64	36
28	65	35
29	65	35
30	66	34

	Rain chance (%)
1	35
2	35
3	35
4	35
5	34
6	33
7	33
8	32
9	31
10	30
11	29
12	29
13	28
14	27
15	27
16	26
17	26
18	25
19	25
20	25
21	24
22	24
23	24
24	24
25	24
26	23
27	23
28	23
29	22
30	21

	Dry (%)	Comfortable (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	92	8
6	92	8
7	92	8
8	92	8
9	91	9
10	91	9
11	91	9
12	90	10
13	90	10
14	90	10
15	89	11
16	89	11
17	89	11
18	89	11
19	89	11
20	89	11
21	89	11
22	89	11
23	89	11
24	90	10
25	90	10
26	90	10
27	90	10
28	90	10
29	89	11
30	89	11

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

	Clearer (%)	Cloudier (%)
1	66	34
2	66	34
3	66	34
4	66	34
5	65	35
6	65	35
7	65	35
8	65	35
9	65	35
10	65	35
11	65	35
12	64	36
13	63	37
14	63	37
15	63	37
16	63	37
17	64	36
18	63	37
19	63	37
20	62	38
21	62	38
22	63	37
23	62	38
24	63	37
25	63	37
26	64	36
27	64	36
28	65	35
29	65	35
30	66	34

	Rain chance (%)
1	35
2	35
3	35
4	35
5	34
6	33
7	33
8	32
9	31
10	30
11	29
12	29
13	28
14	27
15	27
16	26
17	26
18	25
19	25
20	25
21	24
22	24
23	24
24	24
25	24
26	23
27	23
28	23
29	22
30	21

	Dry (%)	Comfortable (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	92	8
6	92	8
7	92	8
8	92	8
9	91	9
10	91	9
11	91	9
12	90	10
13	90	10
14	90	10
15	89	11
16	89	11
17	89	11
18	89	11
19	89	11
20	89	11
21	89	11
22	89	11
23	89	11
24	90	10
25	90	10
26	90	10
27	90	10
28	90	10
29	89	11
30	89	11

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

	Clearer (%)	Cloudier (%)
1	66	34
2	66	34
3	66	34
4	66	34
5	65	35
6	65	35
7	65	35
8	65	35
9	65	35
10	65	35
11	65	35
12	64	36
13	63	37
14	63	37
15	63	37
16	63	37
17	64	36
18	63	37
19	63	37
20	62	38
21	62	38
22	63	37
23	62	38
24	63	37
25	63	37
26	64	36
27	64	36
28	65	35
29	65	35
30	66	34

	Rain chance (%)
1	35
2	35
3	35
4	35
5	34
6	33
7	33
8	32
9	31
10	30
11	29
12	29
13	28
14	27
15	27
16	26
17	26
18	25
19	25
20	25
21	24
22	24
23	24
24	24
25	24
26	23
27	23
28	23
29	22
30	21

	Dry (%)	Comfortable (%)
1	93	7
2	93	7
3	93	7
4	93	7
5	92	8
6	92	8
7	92	8
8	92	8
9	91	9
10	91	9
11	91	9
12	90	10
13	90	10
14	90	10
15	89	11
16	89	11
17	89	11
18	89	11
19	89	11
20	89	11
21	89	11
22	89	11
23	89	11
24	90	10
25	90	10
26	90	10
27	90	10
28	90	10
29	89	11
30	89	11