Newcastle weather in September

In September, Newcastle sees average daytime highs of 19°C and overnight lows near 15°C, with 53 mm of rain across 6.6 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 12th-wettest month of the year here.

Highs climb over the month, from about 18°C in the first days to 19°C by the end. The sky is clear or mostly clear about 61% 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 Newcastle's 2nd-clearest and 7th-windiest month. For the whole year in context, see Newcastle's year-round climate.

Daytime high
19°
9th warmest
Overnight low
15°
4th coldest
Rainfall
53 mm
6.6 wet days
Daylight
11 h 48 min
6:53 AM – 6:41 PM
Cloud cover
36%
2nd clearest
Wind
19 km/h
7th windiest
Solar energy
4.93 kWh/m²
Travel score
6.9
out of 10

Newcastle is city in New South Wales, Australia.

Density
1,942/km²
people per km²
Founded
1804

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 19°C by the end.

A typical September day in Newcastle reaches about 19°C in the afternoon and slips back to 15°C overnight — a 4°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 2°C warmer than August and about 1°C cooler than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
11814
21814
31814
41814
51814
61814
71814
81814
91814
101814
111814
121814
131914
141914
151914
161915
171915
181915
191915
201915
211915
221915
231915
241915
251915
261915
271915
281915
292015
302015

Newcastle weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 12th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 21°769.513.97.2
Feb24° / 21°979.813.27.0
Mar23° / 20°9811.712.36.8
Apr21° / 18°8711.211.26.6
May19° / 16°9410.710.36.2
Jun17° / 14°11311.69.95.5
Jul16° / 13°739105.6
Aug17° / 13°567.210.86.3
Sep19° / 15°536.611.86.9
Oct20° / 16°638.412.86.8
Nov21° / 18°819.613.76.6
Dec23° / 20°709.814.17.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 61% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 24%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17426
27426
37426
47426
57525
67525
77525
87624
97624
107723
117723
127822
137822
147822
157822
167822
177822
187822
197723
207723
217723
227723
237723
247624
257624
267624
277525
287426
297327
307327

Chance of precipitation in September

Any precipitation

Newcastle gets around 53 mm of rain over 6.6 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 22% and peaks near 28% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
427
527
626
726
825
924
1023
1123
1222
1322
1421
1521
1620
1720
1820
1920
2020
2120
2220
2320
2420
2520
2620
2720
2821
2921
3021

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 74% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
185150
284151
384151
484151
584151
683161
783161
883161
983161
1082171
1181172
1280182
1379192
1478202
1576222
1675232
1774242
1873252
1971263
2070273
2169283
2267294
2367294
2466304
2564315
2664315
2762326
2861327
2960337
3059338

Wind in September

Winds average 19 km/h in September.

Across September, daily wind ranges from about 19 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2719light breeze
2819light breeze
2919light breeze
3019light 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 7:14 AM to 6:34 AM, and sunset from 6:31 PM to 6:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.37:146:31
211.37:136:32
311.47:116:33
411.47:106:33
511.47:096:34
611.57:076:35
711.57:066:35
811.57:046:36
911.67:036:37
1011.67:026:37
1111.67:006:38
1211.76:596:39
1311.76:576:39
1411.76:566:40
1511.86:556:41
1611.86:536:41
1711.86:526:42
1811.96:506:43
1911.96:496:43
2011.96:486:44
2112.06:466:45
2212.06:456:45
2312.06:436:46
2412.16:426:47
2512.16:416:47
2612.16:396:48
2712.26:386:49
2812.26:366:49
2912.36:356:50
3012.36:346:51

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.93 kWh/m².

For context, solar energy here swings from a low near 2.46 kWh/m² to a high of 6.64 kWh/m² in January across the year — September's 4.93 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.4Bright
54.4Bright
64.5Bright
74.5Bright
84.6Bright
94.6Bright
104.7Bright
114.8Bright
124.8Bright
134.8Bright
144.9Bright
155.0Bright
165.0Bright
175.0Bright
185.1Bright
195.1Bright
205.1Bright
215.2Bright
225.2Bright
235.2Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Hazard calendar for Newcastle

In seasonPeak

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

Newcastle 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 Newcastle?

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

6.9
Sightseeing
4th-best month of the year
2.7
Beach & pool
8th-best month of the year

September is a reasonable time to visit Newcastle for sightseeing.

What to pack for Newcastle in September

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

In September, Newcastle sees daytime highs around 19°C and nights near 15°C. Worth packing: sun protection. About 7 days see rain.

sun protection

Sea temperature near Newcastle in September

The nearest coast averages about 18°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 18°C.

It's comfortable for a long swim from Nov 13 to Jun 11 — about 6.9 months when the water holds above 20°C.

16°18°20°22°24°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan23Refreshing
Feb23Refreshing
Mar23Refreshing
Apr22Refreshing
May21Refreshing
Jun20Cool
Jul19Cool
Aug18Cool
Sep18Cool
Oct19Cool
Nov20Refreshing
Dec21Refreshing

UV index in Newcastle 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 Newcastle peaks around January 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 18UV 13Jun 19UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar9Very high
Apr6High
May4Moderate
Jun2Moderate
Jul3Moderate
Aug4Moderate
Sep6High
Oct8Very high
Nov10Very high
Dec11Extreme

Air quality in Newcastle 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 Newcastle is worst in December — around 23 µg/m³ PM2.5 (moderate), about 4.3× the cleanest month (June, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateDec 1621 µg/m³Jun 205 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb7Good
Mar7Good
Apr6Good
May6Good
Jun5Good
Jul6Good
Aug7Good
Sep8Good
Oct8Good
Nov11Good
Dec23Moderate
Location & terrain

Where is Newcastle?

Newcastle sits at 32.9°S, 151.8°E, 48 m above sea level, in Australia. The nearest listed city is Maitland, 30 km away.

Topography around Newcastle

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

Within 3 km, the terrain around Newcastle has only modest variations in elevation — a maximum elevation change of 76 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 158 m; within 80 km, large variations in elevation — a maximum elevation change of 863 m.

The land around Newcastle is covered by water (61%) and artificial surfaces (31%) within 3 km, water (53%) within 16 km, and trees (44%) and water (33%) within 80 km.

3 km
76 m
16 km
158 m
80 km
863 m
treesgrasslandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Maitland 30 km · Cessnock 41 km · Central Coast 67 km · Umina Beach 79 km · Pittwater 93 km · Dee Why 102 km · Saint Ives 106 km · Hornsby 107 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 Newcastle (-32.9295°, 151.7801°, elevation 48 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).