Karratha weather in September

In September, Karratha sees average daytime highs of 27°C and overnight lows near 20°C, with 2 mm of rain across 0.2 wet days and about 11.9 hours of daylight. It is the 9th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 26°C in the first days to 28°C by the end. The sky is clear or mostly clear about 90% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Karratha's 2nd-clearest and 6th-windiest month. For the whole year in context, see Karratha's year-round climate.

Daytime high
27°
9th warmest
Overnight low
20°
4th coldest
Rainfall
2 mm
0.2 wet days
Daylight
11 h 54 min
6:10 AM – 6:03 PM
Cloud cover
9%
2nd clearest
Wind
19 km/h
6th windiest
Solar energy
6.75 kWh/m²
Travel score
9.1
out of 10

Karratha is town in Western Australia.

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 26°C in the first days to 28°C by the end.

A typical September day in Karratha reaches about 27°C in the afternoon and slips back to 20°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 29°C. Set against its neighbours, September runs about 2°C warmer than August and about 2°C cooler than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12619
22619
32619
42620
52620
62620
72620
82620
92620
102620
112620
122620
132720
142720
152720
162720
172720
182720
192721
202721
212721
222721
232721
242721
252721
262721
272721
282821
292821
302821

How September really feels in Karratha

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Karratha weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 27°453.913.15.0
Feb32° / 28°814.912.74.8
Mar32° / 28°683.412.14.8
Apr31° / 26°251.711.55.8
May28° / 22°252.6117.8
Jun25° / 19°312.710.88.7
Jul24° / 18°121.310.99.3
Aug25° / 19°30.511.39.5
Sep27° / 20°20.211.99.1
Oct29° / 23°10.212.57.7
Nov30° / 25°10.2136.8
Dec31° / 26°201.213.25.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 90% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 4%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1964
2964
3964
4964
5964
6964
7964
8964
9955
10955
11955
12955
13964
14964
15964
16964
17964
18964
19964
20973
21973
22973
23973
24973
25973
26973
27973
28973
29973
30973

Chance of precipitation in September

Any precipitation

Karratha gets around 2 mm of rain over 0.2 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 1% and peaks near 1% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
41
51
61
71
81
91
101
111
121
131
141
151
161
171
181
191
200
210
220
230
240
250
260
270
280
290
301

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 43% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15232142
25132152
35033152
44933162
54833162
64833172
74733172
84733172
94633182
104633182
114633192
124533192
134533192
144533192
154533192
164534192
174434192
184435192
194335192
204336202
214236202
224137202
234037203
243938203
253839213
263739213
273640213
283440223
293341234
303141234

Wind in September

Winds average 19 km/h in September.

Across September, daily wind ranges from about 18 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light 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
2220light breeze
2320light breeze
2420light breeze
2520light breeze
2620light breeze
2720light breeze
2820light breeze
2920breezy
3020breezy

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 36 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over September. Sunrise moves from 6:25 AM to 5:57 AM, and sunset from 6:00 PM to 6:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:256:00
211.66:246:00
311.66:236:00
411.66:226:01
511.76:216:01
611.76:206:01
711.76:196:01
811.76:186:02
911.76:176:02
1011.86:166:02
1111.86:156:02
1211.86:146:02
1311.86:136:03
1411.86:126:03
1511.96:116:03
1611.96:106:03
1711.96:096:04
1811.96:086:04
1911.96:086:04
2012.06:076:04
2112.06:066:05
2212.06:056:05
2312.06:046:05
2412.06:036:05
2512.16:026:06
2612.16:016:06
2712.16:006:06
2812.15:596:06
2912.15:586:07
3012.25:576:07

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.75 kWh/m².

For context, solar energy here swings from a low near 4.19 kWh/m² to a high of 8.16 kWh/m² in November across the year — September's 6.75 kWh/m² falls in the middle.

02468151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.3Intense
46.3Intense
56.3Intense
66.4Intense
76.4Intense
86.4Intense
96.5Intense
106.5Intense
116.5Intense
126.6Intense
136.6Intense
146.7Intense
156.7Intense
166.8Intense
176.8Intense
186.8Intense
196.9Intense
206.9Intense
217.0Intense
227.0Intense
237.0Intense
247.1Intense
257.1Intense
267.2Intense
277.2Intense
287.2Intense
297.3Intense
307.3Intense
Planning a trip in September

Hazard calendar for Karratha

In seasonPeak

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

Karratha 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 Karratha?

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

9.1
Sightseeing
3rd-best month of the year
8.9
Beach & pool
3rd-best month of the year

September is one of the better times to visit Karratha for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Karratha in September

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

In September, Karratha sees daytime highs around 27°C and nights near 20°C. Pack sun protection. Worth having: light clothes.

sun protectionlight clothes

Sea temperature near Karratha in September

The nearest coast averages about 24°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 13 km away) is warmest in March at about 30°C and coldest in August near 23°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb30Tropical
Mar30Tropical
Apr29Tropical
May27Warm
Jun24Warm
Jul23Refreshing
Aug23Refreshing
Sep24Refreshing
Oct25Warm
Nov27Warm
Dec28Warm

UV index in Karratha in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Karratha peaks around December 23 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 7 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeDec 23UV 15Jun 19UV 7
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar13Extreme
Apr10Very high
May8Very high
Jun7High
Jul7Very high
Aug8Very high
Sep10Extreme
Oct12Extreme
Nov13Extreme
Dec15Extreme

Air quality in Karratha 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 Karratha is worst in December — around 49 µg/m³ PM2.5 (poor), about 7.0× the cleanest month (July, 7 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModerateGoodModeratePoorDec 2048 µg/m³Jul 207 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb31Moderate
Mar23Moderate
Apr11Good
May9Good
Jun8Good
Jul7Good
Aug7Good
Sep11Good
Oct20Moderate
Nov32Moderate
Dec49Poor
Location & terrain

Where is Karratha?

Karratha sits at 20.7°S, 116.8°E, 20 m above sea level, in Australia. The nearest listed city is Port Hedland, 190 km away.

BroomeGeraldtonKalgoorlieEllenbrookLandsdaleBallajuraDuncraig

Topography around Karratha

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

Within 3 km, the terrain around Karratha has only modest variations in elevation — a maximum elevation change of 123 m around an average of 23 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 170 m; within 80 km, significant variations in elevation — a maximum elevation change of 377 m.

The land around Karratha is covered by grassland (54%) within 3 km, grassland (51%) and water (31%) within 16 km, and grassland (48%) and water (44%) within 80 km.

3 km
123 m
16 km
170 m
80 km
377 m
shrubsgrasslandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Port Hedland 190 km · Broome 645 km · Geraldton 922 km · Kalgoorlie 1,205 km · Ellenbrook 1,230 km · Landsdale 1,235 km · Ballajura 1,238 km · Duncraig 1,238 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 Karratha (-20.7376°, 116.8463°, 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. 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).