Thornlie weather in July

In July, Thornlie sees average daytime highs of 17°C and overnight lows near 9°C, with 96 mm of rain across 11.6 wet days and about 10.1 hours of daylight. It is the 12th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 33% of the time in July, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of July to 10 h 24 min by month's end. Set against the rest of the year, July is Thornlie's 12th-clearest and 9th-windiest month. For the whole year in context, see Thornlie's year-round climate.

Daytime high
17°
12th warmest
Overnight low
1st coldest
Rainfall
96 mm
11.6 wet days
Daylight
10 h 06 min
7:19 AM – 5:25 PM
Cloud cover
50%
12th clearest
Wind
13 km/h
9th windiest
Solar energy
2.65 kWh/m²
Travel score
5.3
out of 10

Thornlie is suburb of Perth, Western Australia.

Density
2,058/km²
people per km²

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 17°C through the month.

A typical July day in Thornlie reaches about 17°C in the afternoon and slips back to 9°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 19°C. Set against its neighbours, July runs about 1°C cooler than June and on par with August.

10°15°20°151015202531
Avg high (°C)Avg low (°C)
1179
2179
3179
4179
5179
6179
7178
8178
9178
10178
11178
12178
13178
14178
15178
16178
17178
18178
19179
20179
21179
22179
23179
24179
25179
26179
27179
28179
29179
30179
31179

Thornlie weather by month

How July compares with the rest of the year at a glance. July is the 12th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 18°192.113.95.7
Feb31° / 19°171.713.25.7
Mar29° / 17°182.712.27.0
Apr25° / 14°26411.28.0
May21° / 11°62710.47.1
Jun18° / 87109.96.0
Jul17° / 9611.610.15.3
Aug17° / 8710.710.85.7
Sep19° / 608.711.86.4
Oct22° / 11°29512.87.8
Nov26° / 14°22413.68.1
Dec29° / 16°111.914.17.1

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in July, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 29% of July, with mostly cloudy or overcast conditions the remaining 38%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16139
26139
36139
46238
56238
66337
76337
86337
96337
106337
116337
126238
136238
146238
156238
166238
176238
186139
196139
206139
216139
226139
236139
246139
256139
266238
276238
286238
296040
306040
316040

Chance of precipitation in July

Any precipitation

Thornlie gets around 96 mm of rain over 11.6 wet days in July, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
139
239
338
438
538
637
737
836
936
1036
1136
1235
1335
1435
1535
1635
1736
1836
1936
2036
2137
2237
2338
2438
2538
2638
2739
2839
2939
3039
3139

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

Most of July feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, July lands in the dry band about 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1964
2964
3973
4973
5973
6973
7982
8982
9982
10982
11982
12982
13982
14991
15991
16991
17991
18982
19982
20982
21982
22982
23973
24973
25973
26973
27964
28964
29964
30964
31964

Wind in July

Winds average 13 km/h in July.

Across July, daily wind ranges from about 13 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 9 h 54 min at the start of July to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over July. Sunrise moves from 7:22 AM to 7:11 AM, and sunset from 5:17 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.97:225:17
29.97:225:18
39.97:225:18
49.97:225:18
510.07:225:19
610.07:225:19
710.07:215:20
810.07:215:20
910.07:215:21
1010.07:215:21
1110.07:215:22
1210.07:205:22
1310.07:205:23
1410.17:205:23
1510.17:195:24
1610.17:195:25
1710.17:195:25
1810.17:185:26
1910.17:185:26
2010.27:175:27
2110.27:175:28
2210.27:165:28
2310.27:165:29
2410.27:155:29
2510.37:155:30
2610.37:145:31
2710.37:135:31
2810.37:135:32
2910.37:125:33
3010.47:115:33
3110.47:115:34

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 2.65 kWh/m².

For context, solar energy here swings from a low near 2.55 kWh/m² to a high of 8.36 kWh/m² in December across the year — July's 2.65 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.5Moderate
22.5Moderate
32.5Moderate
42.5Moderate
52.5Moderate
62.5Moderate
72.5Moderate
82.6Moderate
92.6Moderate
102.6Moderate
112.6Moderate
122.6Moderate
132.6Moderate
142.6Moderate
152.7Moderate
162.7Moderate
172.7Moderate
182.7Moderate
192.7Moderate
202.7Moderate
212.7Moderate
222.8Moderate
232.8Moderate
242.8Moderate
252.8Moderate
262.8Moderate
272.8Moderate
282.9Moderate
292.9Moderate
302.9Moderate
312.9Moderate
Planning a trip in July

Hazard calendar for Thornlie

In seasonPeak

In July, Thornlie sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

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

Thornlie's rainy season runs May–September, when most of the year's rain falls.

Cyclone
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is July a good time to visit Thornlie?

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

5.3
Sightseeing
12th-best month of the year
1.1
Beach & pool
12th-best month of the year

July is a reasonable time to visit Thornlie for sightseeing.

What to pack for Thornlie in July

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

In July, Thornlie sees daytime highs around 17°C and nights near 9°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Thornlie in July

The nearest coast averages about 20°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 32 km away) is warmest in February at about 22°C and coldest in September near 19°C.

It's comfortable for a long swim from Nov 26 to Jul 9 — about 7.4 months when the water holds above 20°C.

18°20°22°24°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar22Refreshing
Apr22Refreshing
May22Refreshing
Jun21Refreshing
Jul20Cool
Aug19Cool
Sep19Cool
Oct19Cool
Nov20Cool
Dec21Refreshing

UV index in Thornlie in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Thornlie peaks around December 23 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeModerateVery highExtremeDec 23UV 13Jun 21UV 3
UV index (midday)Level
Jan13Extreme
Feb12Extreme
Mar11Extreme
Apr6High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug5Moderate
Sep8Very high
Oct9Very high
Nov10Extreme
Dec13Extreme

Air quality in Thornlie in July

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.

Air quality in Thornlie is worst in May — around 18 µg/m³ PM2.5 (moderate), about 4.4× the cleanest month (December, 4 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodMay 1517 µg/m³Dec 185 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb7Good
Mar5Good
Apr10Good
May18Moderate
Jun8Good
Jul6Good
Aug7Good
Sep15Moderate
Oct15Moderate
Nov10Good
Dec4Good
Location & terrain

Where is Thornlie?

Thornlie sits at 32.1°S, 116.0°E, 19 m above sea level, in Australia. The nearest listed city is Canning Vale, 3.0 km away.

Topography around Thornlie

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

Within 3 km, the terrain around Thornlie has only modest variations in elevation — a maximum elevation change of 27 m around an average of 16 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 378 m; within 80 km, significant variations in elevation — a maximum elevation change of 567 m.

The land around Thornlie is covered by artificial surfaces (74%) within 3 km, artificial surfaces (40%) and trees (39%) within 16 km, and trees (43%) and water (29%) within 80 km.

3 km
27 m
16 km
378 m
80 km
567 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
July weather nearby: Canning Vale 3.0 km · Gosnells 5.0 km · Willetton 6.0 km · Perth 15 km · Byford 19 km · Morley 20 km · Dianella 21 km · Kwinana 25 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 Thornlie (-32.06°, 115.955°, elevation 19 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).