Bacchus Marsh weather in September

In September, Bacchus Marsh sees average daytime highs of 16°C and overnight lows near 7°C, with 52 mm of rain across 10.3 wet days and about 11.7 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 17°C by the end. The sky is clear or mostly clear about 19% 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 Bacchus Marsh's 8th-clearest and 2nd-windiest month. For the whole year in context, see Bacchus Marsh's year-round climate.

Daytime high: 16°; 8th warmest
Overnight low: 7°; 4th coldest
Rainfall: 52 mm; 10.3 wet days
Daylight: 11 h 48 min; 7:24 AM – 7:09 PM
Cloud cover: 63%; 8th clearest
Wind: 15 km/h; 2nd windiest
Solar energy: 3.98 kWh/m²
Travel score: 4.9; out of 10

Bacchus Marsh is Town in Victoria, Australia.

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

← August Bacchus Marsh 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 15°C in the first days to 17°C by the end.

A typical September day in Bacchus Marsh reaches about 16°C in the afternoon and slips back to 7°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 21°C. Set against its neighbours, September runs about 2°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)	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16	16	16	16	16	16	16	17	17	17	17	17	17	17
Avg low (°C)	6	6	6	6	6	6	6	6	6	6	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7

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

Bacchus Marsh weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	25° / 13°	46	6.2	14.3	7.5
Feb	25° / 13°	44	6	13.5	7.5
Mar	23° / 12°	28	4.7	12.3	7.6
Apr	19° / 9°	37	6.3	11.1	6.6
May	16° / 8°	33	6.9	10	5.1
Jun	13° / 6°	43	8.6	9.4	3.7
Jul	12° / 6°	35	8.8	9.7	3.4
Aug	14° / 6°	43	9.6	10.5	3.9
Sep	16° / 7°	52	10.3	11.7	4.9
Oct	18° / 8°	58	9.8	13	5.9
Nov	21° / 9°	63	8.9	14	6.5
Dec	23° / 11°	54	7.4	14.6	7.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% 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 59%.

	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 (%)	44	43	43	43	43	43	42	41	41	41	40	40	40	40	40	39	40	40	40	40	40	40	41	41	41	41	41	41	41	41
Cloudier (%)	56	57	57	57	57	57	58	59	59	59	60	60	60	60	60	61	60	60	60	60	60	60	59	59	59	59	59	59	59	59

	Clearer (%)	Cloudier (%)
1	44	56
2	43	57
3	43	57
4	43	57
5	43	57
6	43	57
7	42	58
8	41	59
9	41	59
10	41	59
11	40	60
12	40	60
13	40	60
14	40	60
15	40	60
16	39	61
17	40	60
18	40	60
19	40	60
20	40	60
21	40	60
22	40	60
23	41	59
24	41	59
25	41	59
26	41	59
27	41	59
28	41	59
29	41	59
30	41	59

Chance of precipitation in September

Any precipitation

Bacchus Marsh gets around 52 mm of rain over 10.3 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 33% and peaks near 36% 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 (%)	32	33	34	34	35	36	36	36	36	36	35	35	34	34	33	33	32	32	32	32	32	32	32	32	32	32	32	33	33	33

	Rain chance (%)
1	32
2	33
3	34
4	34
5	35
6	36
7	36
8	36
9	36
10	36
11	35
12	35
13	34
14	34
15	33
16	33
17	32
18	32
19	32
20	32
21	32
22	32
23	32
24	32
25	32
26	32
27	32
28	33
29	33
30	33

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	99	99	99	99	99	99	99	99	99	99	100	100	100	100
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	1	1	0	0	0	0

	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	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	100	0
28	100	0
29	100	0
30	100	0

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	14	14	14	14	14	14	14
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	14	light breeze
25	14	light breeze
26	14	light breeze
27	14	light breeze
28	14	light breeze
29	14	light breeze
30	14	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 7:47 AM to 7:01 AM, and sunset from 6:56 PM to 7:22 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	11.4	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)	7:47	7:46	7:44	7:43	7:41	7:40	7:38	7:37	7:35	7:33	7:32	7:30	7:29	7:27	7:25	7:24	7:22	7:20	7:19	7:17	7:16	7:14	7:12	7:11	7:09	7:08	7:06	7:04	7:03	7:01
Sunset (PM)	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	7:09	7:10	7:11	7:12	7:13	7:14	7:15	7:16	7:16	7:17	7:18	7:19	7:20	7:21	7:22

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.1	7:47	6:56
2	11.2	7:46	6:57
3	11.2	7:44	6:58
4	11.3	7:43	6:59
5	11.3	7:41	7:00
6	11.4	7:40	7:01
7	11.4	7:38	7:02
8	11.4	7:37	7:02
9	11.5	7:35	7:03
10	11.5	7:33	7:04
11	11.6	7:32	7:05
12	11.6	7:30	7:06
13	11.6	7:29	7:07
14	11.7	7:27	7:08
15	11.7	7:25	7:09
16	11.8	7:24	7:09
17	11.8	7:22	7:10
18	11.8	7:20	7:11
19	11.9	7:19	7:12
20	11.9	7:17	7:13
21	12.0	7:16	7:14
22	12.0	7:14	7:15
23	12.1	7:12	7:16
24	12.1	7:11	7:16
25	12.1	7:09	7:17
26	12.2	7:08	7:18
27	12.2	7:06	7:19
28	12.3	7:04	7:20
29	12.3	7:03	7:21
30	12.3	7:01	7:22

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 1.8 kWh/m² to a high of 7.22 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	3.5	3.5	3.5	3.6	3.6	3.6	3.7	3.7	3.7	3.8	3.8	3.8	3.9	3.9	4.0	4.0	4.0	4.1	4.2	4.2	4.3	4.3	4.3	4.4	4.4	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	3.5	Moderate
3	3.5	Moderate
4	3.5	Moderate
5	3.6	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	3.8	Moderate
14	3.9	Moderate
15	3.9	Moderate
16	4.0	Moderate
17	4.0	Bright
18	4.0	Bright
19	4.1	Bright
20	4.2	Bright
21	4.2	Bright
22	4.3	Bright
23	4.3	Bright
24	4.3	Bright
25	4.4	Bright
26	4.4	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 Bacchus Marsh

In seasonPeak

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

Bacchus Marsh 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 Bacchus Marsh?

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

4.9

Sightseeing

9th-best month of the year

0.6

Beach & pool

9th-best month of the year

September is a reasonable time to visit Bacchus Marsh for sightseeing.

What to pack for Bacchus Marsh in September

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

In September, Bacchus Marsh sees daytime highs around 16°C and nights near 7°C. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Bacchus Marsh in September

The nearest coast averages about 12°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 44 km away) is warmest in February at about 21°C and coldest in August near 11°C.

It's comfortable for a long swim from Jan 15 to Mar 11 — about 1.8 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	20	21	20	18	15	13	12	11	12	14	17	19
Comfort	Refreshing	Refreshing	Cool	Cool	Cool	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Cool

	Sea temperature (°C)	Comfort
Jan	20	Refreshing
Feb	21	Refreshing
Mar	20	Cool
Apr	18	Cool
May	15	Cool
Jun	13	Bracing
Jul	12	Bracing
Aug	11	Bracing
Sep	12	Bracing
Oct	14	Bracing
Nov	17	Cool
Dec	19	Cool

UV index in Bacchus Marsh 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 Bacchus Marsh peaks around December 19 at about 13 (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	11	8	5	3	2	2	3	5	8	10	13
Level	Extreme	Extreme	Very high	Moderate	Moderate	Low	Moderate	Moderate	Moderate	Very high	Very high	Extreme

	UV index (midday)	Level
Jan	11	Extreme
Feb	11	Extreme
Mar	8	Very high
Apr	5	Moderate
May	3	Moderate
Jun	2	Low
Jul	2	Moderate
Aug	3	Moderate
Sep	5	Moderate
Oct	8	Very high
Nov	10	Very high
Dec	13	Extreme

Location & terrain

Where is Bacchus Marsh?

Bacchus Marsh sits at 37.7°S, 144.4°E, 111 m above sea level, in Australia. The nearest listed city is Tarneit, 27 km away.

Topography around Bacchus Marsh

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

Within 3 km, the terrain around Bacchus Marsh has only modest variations in elevation — a maximum elevation change of 169 m around an average of 126 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 678 m; within 80 km, large variations in elevation — a maximum elevation change of 1,037 m.

The land around Bacchus Marsh is covered by grassland (40%) and artificial surfaces (27%) within 3 km, grassland (52%) and trees (29%) within 16 km, and grassland (47%) and trees (24%) within 80 km.

3 km

169 m

grassland 40%

16 km

678 m

grassland 52%

80 km

1,037 m

grassland 47%

treesgrasslandcroplandartificial surfacesbare terrainwaterwetland

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

September weather nearby: Tarneit 27 km · Hillside 27 km · Caroline Springs 27 km · Sunbury 27 km · Taylors Hill 28 km · Wyndham Vale 29 km · Deer Park 31 km · Taylors Lakes 31 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 Bacchus Marsh (-37.6727°, 144.4383°, elevation 111 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	6
2	15	6
3	15	6
4	15	6
5	15	6
6	15	6
7	15	6
8	15	6
9	15	6
10	15	6
11	15	7
12	16	7
13	16	7
14	16	7
15	16	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	17	7
25	17	7
26	17	7
27	17	7
28	17	7
29	17	7
30	17	7

	Clearer (%)	Cloudier (%)
1	44	56
2	43	57
3	43	57
4	43	57
5	43	57
6	43	57
7	42	58
8	41	59
9	41	59
10	41	59
11	40	60
12	40	60
13	40	60
14	40	60
15	40	60
16	39	61
17	40	60
18	40	60
19	40	60
20	40	60
21	40	60
22	40	60
23	41	59
24	41	59
25	41	59
26	41	59
27	41	59
28	41	59
29	41	59
30	41	59

	Rain chance (%)
1	32
2	33
3	34
4	34
5	35
6	36
7	36
8	36
9	36
10	36
11	35
12	35
13	34
14	34
15	33
16	33
17	32
18	32
19	32
20	32
21	32
22	32
23	32
24	32
25	32
26	32
27	32
28	33
29	33
30	33

	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	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	100	0
28	100	0
29	100	0
30	100	0

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

	Clearer (%)	Cloudier (%)
1	44	56
2	43	57
3	43	57
4	43	57
5	43	57
6	43	57
7	42	58
8	41	59
9	41	59
10	41	59
11	40	60
12	40	60
13	40	60
14	40	60
15	40	60
16	39	61
17	40	60
18	40	60
19	40	60
20	40	60
21	40	60
22	40	60
23	41	59
24	41	59
25	41	59
26	41	59
27	41	59
28	41	59
29	41	59
30	41	59

	Rain chance (%)
1	32
2	33
3	34
4	34
5	35
6	36
7	36
8	36
9	36
10	36
11	35
12	35
13	34
14	34
15	33
16	33
17	32
18	32
19	32
20	32
21	32
22	32
23	32
24	32
25	32
26	32
27	32
28	33
29	33
30	33

	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	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	100	0
28	100	0
29	100	0
30	100	0

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

	Clearer (%)	Cloudier (%)
1	44	56
2	43	57
3	43	57
4	43	57
5	43	57
6	43	57
7	42	58
8	41	59
9	41	59
10	41	59
11	40	60
12	40	60
13	40	60
14	40	60
15	40	60
16	39	61
17	40	60
18	40	60
19	40	60
20	40	60
21	40	60
22	40	60
23	41	59
24	41	59
25	41	59
26	41	59
27	41	59
28	41	59
29	41	59
30	41	59

	Rain chance (%)
1	32
2	33
3	34
4	34
5	35
6	36
7	36
8	36
9	36
10	36
11	35
12	35
13	34
14	34
15	33
16	33
17	32
18	32
19	32
20	32
21	32
22	32
23	32
24	32
25	32
26	32
27	32
28	33
29	33
30	33

	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	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	100	0
28	100	0
29	100	0
30	100	0