Mount Gambier weather in September

In September, Mount Gambier sees average daytime highs of 16°C and overnight lows near 7°C, with 73 mm of rain across 12.4 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 16°C through the month. The sky is clear or mostly clear about 14% 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 18 min by month's end. Set against the rest of the year, September is Mount Gambier's 10th-clearest and 2nd-windiest month. For the whole year in context, see Mount Gambier's year-round climate.

Daytime high: 16°; 9th warmest
Overnight low: 7°; 4th coldest
Rainfall: 73 mm; 12.4 wet days
Daylight: 11 h 48 min; 7:08 AM – 6:54 PM
Cloud cover: 67%; 10th clearest
Wind: 16 km/h; 2nd windiest
Solar energy: 3.98 kWh/m²
Travel score: 4.4; out of 10

Mount Gambier is city in South Australia.

Density: 927/km²; people per km²
Founded: 1854

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

← August Mount Gambier 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 16°C through the month.

A typical September day in Mount Gambier reaches about 16°C in the afternoon and slips back to 7°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 20°C. Set against its neighbours, September runs about 2°C warmer than August and about 2°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)	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16	16	16	16	16	16	16	16	16	17
Avg low (°C)	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	8	8	8	8

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

Mount Gambier weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	24° / 12°	38	5	14.3	7.9
Feb	24° / 13°	24	3.8	13.5	8.0
Mar	22° / 11°	28	5.5	12.3	7.4
Apr	19° / 10°	38	6.8	11.1	6.4
May	16° / 9°	51	9.2	10	4.9
Jun	14° / 7°	66	11.6	9.4	3.7
Jul	13° / 7°	74	12.9	9.6	3.3
Aug	14° / 7°	81	13.9	10.5	3.6
Sep	16° / 7°	73	12.4	11.7	4.4
Oct	18° / 8°	51	9.7	13	5.7
Nov	20° / 9°	46	7.4	14	6.5
Dec	22° / 11°	44	6.9	14.6	7.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 64%.

	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 (%)	35	36	36	35	36	36	36	36	36	36	36	36	36	36	36	36	37	36	36	36	37	37	37	37	37	37	37	37	37	37
Cloudier (%)	65	64	64	65	64	64	64	64	64	64	64	64	64	64	64	64	63	64	64	64	63	63	63	63	63	63	63	63	63	63

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

Chance of precipitation in September

Any precipitation

Mount Gambier gets around 73 mm of rain over 12.4 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 41% and peaks near 43% 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 (%)	41	41	42	42	43	43	43	43	43	43	43	43	43	43	42	42	41	41	41	40	40	39	39	38	38	38	37	37	37	37

	Rain chance (%)
1	41
2	41
3	42
4	42
5	43
6	43
7	43
8	43
9	43
10	43
11	43
12	43
13	43
14	43
15	42
16	42
17	41
18	41
19	41
20	40
21	40
22	39
23	39
24	38
25	38
26	38
27	37
28	37
29	37
30	37

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	100	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	1	1	1	1	1	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	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 15 km/h on the calmest days to 16 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)	15	15	15	15	15	15	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16
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	15	light breeze
2	15	light breeze
3	15	light breeze
4	15	light breeze
5	15	light breeze
6	15	light breeze
7	16	light breeze
8	16	light breeze
9	16	light breeze
10	16	light breeze
11	16	light breeze
12	16	light breeze
13	16	light breeze
14	16	light breeze
15	16	light breeze
16	16	light breeze
17	16	light breeze
18	16	light breeze
19	16	light breeze
20	16	light breeze
21	16	light breeze
22	16	light breeze
23	16	light breeze
24	16	light breeze
25	16	light breeze
26	16	light breeze
27	16	light breeze
28	16	light breeze
29	16	light breeze
30	16	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 06 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 72 minutes over September. Sunrise moves from 7:32 AM to 6:46 AM, and sunset from 6:41 PM to 7:07 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	11.2	11.2	11.3	11.3	11.3	11.4	11.4	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.8	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	12.3
Sunrise (AM)	7:32	7:31	7:29	7:28	7:26	7:24	7:23	7:21	7:20	7:18	7:16	7:15	7:13	7:12	7:10	7:08	7:07	7:05	7:04	7:02	7:00	6:59	6:57	6:55	6:54	6:52	6:51	6:49	6:47	6:46
Sunset (PM)	6:41	6:42	6:43	6:44	6:44	6:45	6:46	6:47	6:48	6:49	6:50	6:51	6:51	6:52	6:53	6:54	6:55	6:56	6:57	6:58	6:58	6:59	7:00	7:01	7:02	7:03	7:04	7:05	7:06	7:07

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.1	7:32	6:41
2	11.2	7:31	6:42
3	11.2	7:29	6:43
4	11.3	7:28	6:44
5	11.3	7:26	6:44
6	11.3	7:24	6:45
7	11.4	7:23	6:46
8	11.4	7:21	6:47
9	11.5	7:20	6:48
10	11.5	7:18	6:49
11	11.6	7:16	6:50
12	11.6	7:15	6:51
13	11.6	7:13	6:51
14	11.7	7:12	6:52
15	11.7	7:10	6:53
16	11.8	7:08	6:54
17	11.8	7:07	6:55
18	11.8	7:05	6:56
19	11.9	7:04	6:57
20	11.9	7:02	6:58
21	12.0	7:00	6:58
22	12.0	6:59	6:59
23	12.1	6:57	7:00
24	12.1	6:55	7:01
25	12.1	6:54	7:02
26	12.2	6:52	7:03
27	12.2	6:51	7:04
28	12.3	6:49	7:05
29	12.3	6:47	7:06
30	12.3	6:46	7:07

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.98 kWh/m².

For context, solar energy here swings from a low near 1.78 kWh/m² to a high of 7.39 kWh/m² in January across the year — September's 3.98 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)	3.4	3.4	3.5	3.5	3.5	3.6	3.6	3.7	3.7	3.7	3.8	3.8	3.9	3.9	3.9	4.0	4.0	4.1	4.1	4.2	4.2	4.3	4.3	4.4	4.4	4.5	4.5	4.5	4.6	4.6
Level	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	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.4	Moderate
2	3.4	Moderate
3	3.5	Moderate
4	3.5	Moderate
5	3.5	Moderate
6	3.6	Moderate
7	3.6	Moderate
8	3.7	Moderate
9	3.7	Moderate
10	3.7	Moderate
11	3.8	Moderate
12	3.8	Moderate
13	3.9	Moderate
14	3.9	Moderate
15	3.9	Moderate
16	4.0	Moderate
17	4.0	Bright
18	4.1	Bright
19	4.1	Bright
20	4.2	Bright
21	4.2	Bright
22	4.3	Bright
23	4.3	Bright
24	4.4	Bright
25	4.4	Bright
26	4.5	Bright
27	4.5	Bright
28	4.5	Bright
29	4.6	Bright
30	4.6	Bright

Planning a trip in September

Hazard calendar for Mount Gambier

In seasonPeak

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

Mount Gambier 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 Mount Gambier?

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

4.4

Sightseeing

9th-best month of the year

0.4

Beach & pool

9th-best month of the year

September is a reasonable time to visit Mount Gambier for sightseeing.

What to pack for Mount Gambier in September

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

In September, Mount Gambier sees daytime highs around 16°C and nights near 7°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Mount Gambier in September

The nearest coast averages about 14°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 34 km away) is warmest in February at about 18°C and coldest in September near 14°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)	17	18	17	16	16	16	15	14	14	14	15	16
Comfort	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Bracing	Bracing	Bracing	Cool	Cool

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

UV index in Mount Gambier in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mount Gambier peaks around December 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 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)	11	10	8	5	3	2	2	3	5	7	9	12
Level	Extreme	Extreme	Very high	Moderate	Moderate	Low	Moderate	Moderate	Moderate	Very high	Very high	Extreme

	UV index (midday)	Level
Jan	11	Extreme
Feb	10	Extreme
Mar	8	Very high
Apr	5	Moderate
May	3	Moderate
Jun	2	Low
Jul	2	Moderate
Aug	3	Moderate
Sep	5	Moderate
Oct	7	Very high
Nov	9	Very high
Dec	12	Extreme

Location & terrain

Where is Mount Gambier?

Mount Gambier sits at 37.8°S, 140.8°E, 41 m above sea level, in Australia. The nearest listed city is Warrnambool, 162 km away.

Topography around Mount Gambier

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

Within 3 km, the terrain around Mount Gambier has only modest variations in elevation — a maximum elevation change of 162 m around an average of 49 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 166 m; within 80 km, significant variations in elevation — a maximum elevation change of 325 m.

The land around Mount Gambier is covered by artificial surfaces (39%), grassland (33%) and trees (22%) within 3 km, grassland (62%) and trees (31%) within 16 km, and grassland (39%), water (29%) and trees (28%) within 80 km.

3 km

162 m

artificial surfaces 39%

16 km

166 m

grassland 62%

80 km

325 m

grassland 39%

treesgrasslandcroplandartificial surfaceswater

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

September weather nearby: Warrnambool 162 km · Horsham 177 km · Ballarat 272 km · Highton 312 km · Torquay 315 km · Geelong 316 km · Corio 317 km · Lara 319 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 Mount Gambier (-37.8318°, 140.7792°, elevation 41 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	15	7
2	15	7
3	15	7
4	15	7
5	15	7
6	15	7
7	15	7
8	15	7
9	15	7
10	15	7
11	15	7
12	15	7
13	15	7
14	15	7
15	15	7
16	16	7
17	16	7
18	16	7
19	16	7
20	16	7
21	16	7
22	16	7
23	16	7
24	16	7
25	16	7
26	16	7
27	16	8
28	16	8
29	16	8
30	17	8

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

	Rain chance (%)
1	41
2	41
3	42
4	42
5	43
6	43
7	43
8	43
9	43
10	43
11	43
12	43
13	43
14	43
15	42
16	42
17	41
18	41
19	41
20	40
21	40
22	39
23	39
24	38
25	38
26	38
27	37
28	37
29	37
30	37

	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	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1

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

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

	Rain chance (%)
1	41
2	41
3	42
4	42
5	43
6	43
7	43
8	43
9	43
10	43
11	43
12	43
13	43
14	43
15	42
16	42
17	41
18	41
19	41
20	40
21	40
22	39
23	39
24	38
25	38
26	38
27	37
28	37
29	37
30	37

	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	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1

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

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

	Rain chance (%)
1	41
2	41
3	42
4	42
5	43
6	43
7	43
8	43
9	43
10	43
11	43
12	43
13	43
14	43
15	42
16	42
17	41
18	41
19	41
20	40
21	40
22	39
23	39
24	38
25	38
26	38
27	37
28	37
29	37
30	37

	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	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	99	1
22	99	1
23	99	1
24	99	1
25	99	1
26	99	1
27	99	1
28	99	1
29	99	1
30	99	1