Whyalla weather in September

In September, Whyalla sees average daytime highs of 22°C and overnight lows near 9°C, with 28 mm of rain across 4.7 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 21°C in the first days to 23°C by the end. The sky is clear or mostly clear about 47% 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 Whyalla's 5th-clearest and 6th-windiest month. For the whole year in context, see Whyalla's year-round climate.

Daytime high: 22°; 8th warmest
Overnight low: 9°; 4th coldest
Rainfall: 28 mm; 4.7 wet days
Daylight: 11 h 48 min; 7:20 AM – 7:08 PM
Cloud cover: 44%; 5th clearest
Wind: 15 km/h; 6th windiest
Solar energy: 4.89 kWh/m²
Travel score: 7.7; out of 10

Whyalla is city in South Australia.

Air quality: Good; PM10 22.2 µg/m³ · 2019
Founded: 1901

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

← August Whyalla 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

Highs climb over the month, from about 21°C in the first days to 23°C by the end.

A typical September day in Whyalla reaches about 22°C in the afternoon and slips back to 9°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 29°C. Set against its neighbours, September runs about 3°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)	21	21	21	21	21	21	21	21	21	22	22	22	22	22	22	22	22	22	23	23	23	23	23	23	23	23	23	23	24	24
Avg low (°C)	8	8	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	10	10	10	10	10	10	10	10	10	10	10	10

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

Whyalla weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	31° / 18°	20	2.6	13.9	5.3
Feb	31° / 18°	21	2	13.2	5.8
Mar	28° / 16°	13	2.3	12.3	7.2
Apr	25° / 13°	19	3	11.2	8.2
May	20° / 10°	19	3.8	10.3	7.4
Jun	17° / 8°	25	4.9	9.9	6.3
Jul	17° / 7°	19	4.2	10	6.3
Aug	19° / 7°	20	5	10.8	7.0
Sep	22° / 9°	28	4.7	11.8	7.7
Oct	25° / 12°	22	3.7	12.8	8.1
Nov	28° / 14°	24	3.7	13.7	7.2
Dec	30° / 16°	30	4.1	14.1	6.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 34%.

	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 (%)	64	63	64	64	64	64	64	64	65	65	65	66	65	66	66	67	67	67	68	67	67	68	68	67	67	67	67	67	67	67
Cloudier (%)	36	37	36	36	36	36	36	36	35	35	35	34	35	34	34	33	33	33	32	33	33	32	32	33	33	33	33	33	33	33

	Clearer (%)	Cloudier (%)
1	64	36
2	63	37
3	64	36
4	64	36
5	64	36
6	64	36
7	64	36
8	64	36
9	65	35
10	65	35
11	65	35
12	66	34
13	65	35
14	66	34
15	66	34
16	67	33
17	67	33
18	67	33
19	68	32
20	67	33
21	67	33
22	68	32
23	68	32
24	67	33
25	67	33
26	67	33
27	67	33
28	67	33
29	67	33
30	67	33

Chance of precipitation in September

Any precipitation

Whyalla gets around 28 mm of rain over 4.7 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 16% and peaks near 17% on the wettest days.

	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 (%)	17	17	17	17	17	16	16	16	16	15	15	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16	15

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

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 99% 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	99	99	99	99	99	99	99	99	98	98	98	98	98	98	98	97	97	97
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	3	3	3

	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	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	97	3
29	97	3
30	97	3

Wind in September

Winds average 15 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 15 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)	14	14	14	14	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15
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	14	light breeze
2	14	light breeze
3	14	light breeze
4	14	light breeze
5	14	light breeze
6	14	light breeze
7	14	light breeze
8	14	light breeze
9	14	light breeze
10	15	light breeze
11	15	light breeze
12	15	light breeze
13	15	light breeze
14	15	light breeze
15	15	light breeze
16	15	light breeze
17	15	light breeze
18	15	light breeze
19	15	light breeze
20	15	light breeze
21	15	light breeze
22	15	light breeze
23	15	light breeze
24	15	light breeze
25	15	light breeze
26	15	light breeze
27	15	light breeze
28	15	light breeze
29	15	light breeze
30	15	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 7:41 AM to 7:00 AM, and sunset from 6:58 PM to 7:18 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	12.3	12.3
Sunrise (AM)	7:41	7:40	7:38	7:37	7:36	7:34	7:33	7:31	7:30	7:29	7:27	7:26	7:24	7:23	7:22	7:20	7:19	7:17	7:16	7:14	7:13	7:12	7:10	7:09	7:07	7:06	7:05	7:03	7:02	7:00
Sunset (PM)	6:58	6:59	6:59	7:00	7:01	7:01	7:02	7:03	7:03	7:04	7:05	7:05	7:06	7:07	7:07	7:08	7:09	7:09	7:10	7:11	7:11	7:12	7:13	7:13	7:14	7:15	7:16	7:16	7:17	7:18

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	7:41	6:58
2	11.3	7:40	6:59
3	11.4	7:38	6:59
4	11.4	7:37	7:00
5	11.4	7:36	7:01
6	11.5	7:34	7:01
7	11.5	7:33	7:02
8	11.5	7:31	7:03
9	11.6	7:30	7:03
10	11.6	7:29	7:04
11	11.6	7:27	7:05
12	11.7	7:26	7:05
13	11.7	7:24	7:06
14	11.7	7:23	7:07
15	11.8	7:22	7:07
16	11.8	7:20	7:08
17	11.8	7:19	7:09
18	11.9	7:17	7:09
19	11.9	7:16	7:10
20	11.9	7:14	7:11
21	12.0	7:13	7:11
22	12.0	7:12	7:12
23	12.0	7:10	7:13
24	12.1	7:09	7:13
25	12.1	7:07	7:14
26	12.1	7:06	7:15
27	12.2	7:05	7:16
28	12.2	7:03	7:16
29	12.3	7:02	7:17
30	12.3	7:00	7:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.89 kWh/m².

For context, solar energy here swings from a low near 2.45 kWh/m² to a high of 7.95 kWh/m² in January across the year — September's 4.89 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	4.3	4.3	4.3	4.4	4.5	4.5	4.5	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	5.5	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	4.3	Bright
4	4.3	Bright
5	4.3	Bright
6	4.4	Bright
7	4.5	Bright
8	4.5	Bright
9	4.5	Bright
10	4.6	Bright
11	4.7	Bright
12	4.7	Bright
13	4.8	Bright
14	4.8	Bright
15	4.9	Bright
16	4.9	Bright
17	5.0	Bright
18	5.0	Bright
19	5.1	Bright
20	5.1	Bright
21	5.2	Bright
22	5.2	Bright
23	5.3	Bright
24	5.3	Bright
25	5.4	Bright
26	5.4	Bright
27	5.5	Bright
28	5.5	Bright
29	5.5	Bright
30	5.6	Bright

Planning a trip in September

Hazard calendar for Whyalla

In seasonPeak

None of Whyalla's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

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

Cyclone

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Whyalla?

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

7.7

Sightseeing

3rd-best month of the year

5.4

Beach & pool

8th-best month of the year

September is one of the better times to visit Whyalla for general sightseeing.

What to pack for Whyalla in September

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

In September, Whyalla sees daytime highs around 22°C and nights near 9°C. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Whyalla in September

The nearest coast averages about 15°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in February at about 23°C and coldest in August near 13°C.

It's comfortable for a long swim from Nov 28 to Apr 16 — about 4.6 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	23	23	22	20	18	15	14	13	15	17	19	21
Comfort	Refreshing	Refreshing	Refreshing	Refreshing	Cool	Cool	Bracing	Bracing	Bracing	Cool	Cool	Refreshing

	Sea temperature (°C)	Comfort
Jan	23	Refreshing
Feb	23	Refreshing
Mar	22	Refreshing
Apr	20	Refreshing
May	18	Cool
Jun	15	Cool
Jul	14	Bracing
Aug	13	Bracing
Sep	15	Bracing
Oct	17	Cool
Nov	19	Cool
Dec	21	Refreshing

UV index in Whyalla in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Whyalla peaks around January 1 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

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

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

Location & terrain

Where is Whyalla?

Whyalla sits at 33.0°S, 137.6°E, 20 m above sea level, in Australia. The nearest listed city is Gawler, 206 km away.

Topography around Whyalla

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

Within 3 km, the terrain around Whyalla has only modest variations in elevation — a maximum elevation change of 63 m around an average of 14 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 169 m; within 80 km, large variations in elevation — a maximum elevation change of 946 m.

The land around Whyalla is covered by artificial surfaces (32%) within 3 km, water (45%), grassland (26%) and shrubs (21%) within 16 km, and grassland (33%) and water (22%) within 80 km.

3 km

63 m

artificial surfaces 32%

16 km

169 m

water 45%

80 km

946 m

grassland 33%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwatermangroves

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

September weather nearby: Gawler 206 km · Paralowie 215 km · Parafield Gardens 217 km · Adelaide 231 km · Adelaide city centre 232 km · Adelaide Hills 234 km · Morphett Vale 249 km · Mount Barker 256 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 Whyalla (-33.0327°, 137.5648°, elevation 20 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	21	8
2	21	8
3	21	9
4	21	9
5	21	9
6	21	9
7	21	9
8	21	9
9	21	9
10	22	9
11	22	9
12	22	9
13	22	9
14	22	9
15	22	9
16	22	9
17	22	9
18	22	9
19	23	10
20	23	10
21	23	10
22	23	10
23	23	10
24	23	10
25	23	10
26	23	10
27	23	10
28	23	10
29	24	10
30	24	10

	Clearer (%)	Cloudier (%)
1	64	36
2	63	37
3	64	36
4	64	36
5	64	36
6	64	36
7	64	36
8	64	36
9	65	35
10	65	35
11	65	35
12	66	34
13	65	35
14	66	34
15	66	34
16	67	33
17	67	33
18	67	33
19	68	32
20	67	33
21	67	33
22	68	32
23	68	32
24	67	33
25	67	33
26	67	33
27	67	33
28	67	33
29	67	33
30	67	33

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

	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	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	97	3
29	97	3
30	97	3

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

	Clearer (%)	Cloudier (%)
1	64	36
2	63	37
3	64	36
4	64	36
5	64	36
6	64	36
7	64	36
8	64	36
9	65	35
10	65	35
11	65	35
12	66	34
13	65	35
14	66	34
15	66	34
16	67	33
17	67	33
18	67	33
19	68	32
20	67	33
21	67	33
22	68	32
23	68	32
24	67	33
25	67	33
26	67	33
27	67	33
28	67	33
29	67	33
30	67	33

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

	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	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	97	3
29	97	3
30	97	3

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

	Clearer (%)	Cloudier (%)
1	64	36
2	63	37
3	64	36
4	64	36
5	64	36
6	64	36
7	64	36
8	64	36
9	65	35
10	65	35
11	65	35
12	66	34
13	65	35
14	66	34
15	66	34
16	67	33
17	67	33
18	67	33
19	68	32
20	67	33
21	67	33
22	68	32
23	68	32
24	67	33
25	67	33
26	67	33
27	67	33
28	67	33
29	67	33
30	67	33

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

	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	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	97	3
29	97	3
30	97	3