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Australia · 1991–2020

Best time to visit
Thornlie.

October leads for comfortable weather in Thornlie: typically 24.1°C by day, 12°C at night, with 36 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high24.1°C

Typical low12°C

Rain in October36 mm

Comfort

October

October · April · November

92climate match

Beach

March

March · December · February

86climate match

Outdoors

September

September · October · May

82climate match

The weakest month is July, scoring 45 against October’s 92 — days reach only 18.7°C, 5° below the 24°C the score treats as ideal, and 147 mm of rain falls.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

6433° / 18.6°

Feb

6432.9° / 18.8°

Mar

7530.4° / 17.3°

Apr

9126.5° / 14.9°

May

7722.6° / 11.7°

Jun

5419.7° / 9.9°

Jul

4518.7° / 8.7°

Aug

5419.4° / 9.1°

Sep

6820.9° / 9.9°

Oct

9224.1° / 12°

Nov

8627.6° / 14.6°

Dec

7630.6° / 16.5°

Monthly climate evidence for Thornlie — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 32 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	33°C	18.6°C	11 mm	1.4	21.8°C	14 h 02	64	Strong coverage
February	32.9°C	18.8°C	15 mm	1.1	22.3°C	13 h 17	64	Strong coverage
March	30.4°C	17.3°C	17 mm	2.5	22.3°C	12 h 23	75	Strong coverage
April	26.5°C	14.9°C	34 mm	4.2	22.0°C	11 h 21	91	Strong coverage
May	22.6°C	11.7°C	90 mm	8.7	21.6°C	10 h 30	77	Strong coverage
June	19.7°C	9.9°C	140 mm	12	20.7°C	10 h 04	54	Strong coverage
July	18.7°C	8.7°C	147 mm	14.2	19.8°C	10 h 14	45	Strong coverage
August	19.4°C	9.1°C	117 mm	12.3	19.1°C	10 h 57	54	Strong coverage
September	20.9°C	9.9°C	78 mm	9.8	18.5°C	11 h 56	68	Strong coverage
October	24.1°C	12°C	36 mm	5.7	18.7°C	12 h 56	92	Strong coverage
November	27.6°C	14.6°C	36 mm	4.3	19.6°C	13 h 49	86	Strong coverage
December	30.6°C	16.5°C	10 mm	2.1	20.8°C	14 h 14	76	Strong coverage

Records at GOSNELLS CITY, 1991–2023
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	44.4°C1 Jan 1997	9.5°C25 Jan 2001	100 mm22 Jan 2000	142 mm2000 · driest 0 mm in 2020	31
February	46.0°C26 Feb 1997	5.5°C25 Feb 2012	109 mm9 Feb 1992	129 mm1992 · driest 0 mm in 2023	30
March	43.3°C10 Mar 2003	6.5°C24 Mar 2001	53 mm23 Mar 2010	53 mm2010 · driest 0 mm in 2023	30
April	39.5°C11 Apr 2020	4.0°C21 Apr 2019	65 mm17 Apr 2002	171 mm2008 · driest 0 mm in 2017	28
May	35.5°C1 May 2002	2.5°C25 May 2012	70 mm19 May 2005	199 mm2005 · driest 4 mm in 2018	29
June	26.5°C1 Jun 2019	0.5°C26 Jun 2010	69 mm23 Jun 2019	295 mm1996 · driest 18 mm in 2021	29
July	27.0°C21 Jul 1994	-4.0°C19 Jul 2012	56 mm5 Jul 2019	286 mm2000 · driest 28 mm in 2018	29
August	28.0°C26 Aug 1998	1.4°C29 Aug 1992	47 mm4 Aug 1994	205 mm1992 · driest 22 mm in 2008	30
September	34.8°C20 Sep 2014	2.0°C15 Sep 2016	36 mm4 Sep 2012	135 mm2013 · driest 3 mm in 2001	32
October	37.5°C17 Oct 2009	3.2°C2 Oct 1993	52 mm18 Oct 1995	91 mm1995 · driest 5 mm in 2000	30
November	41.5°C16 Nov 2019	5.5°C20 Nov 1992	37 mm19 Nov 2009	100 mm2020 · driest 0 mm in 2019	30
December	44.2°C26 Dec 2007	7.1°C13 Dec 2003	20 mm27 Dec 1991	55 mm2011 · driest 0 mm in 2022	32

Typical days per month at GOSNELLS CITY, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	28	21	<1
February	25	20	<1
March	25	15	<1
April	17	5	1
May	7	<1	3
June	<1	0	5
July	<1	0	5
August	1	0	4
September	3	<1	3
October	10	3	<1
November	18	9	1
December	24	14	<1

How often, not how much — every day in GOSNELLS CITY’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	95%	4%	<1%	<1%	31.9–34.2°C
February	96%	5%	2%	2%	31.3–34.9°C
March	90%	7%	1%	3%	28.7–31.8°C
April	85%	15%	4%	14%	25.2–28.3°C
May	65%	28%	10%	32%	21.3–24.0°C
June	36%	41%	19%	52%	18.7–20.6°C
July	20%	44%	17%	59%	18.0–19.4°C
August	30%	37%	14%	49%	18.3–20.8°C
September	48%	30%	8%	38%	19.5–22.7°C
October	76%	17%	4%	16%	22.5–25.6°C
November	84%	12%	3%	9%	25.1–29.8°C
December	92%	6%	<1%	1%	28.9–32.4°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1993Each stripe is one year’s mean temperature against the 23-year average. Warmest: 2011. Coolest: 1993.2016

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 8349108
NOAA station: ASN00009106 · GOSNELLS CITY
Station distance: 3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude -32.06°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 32 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from GOSNELLS CITY is what differs

Gosnells→Armadale→Southern River→Maddington→Kelmscott→Seville Grove→

Or put two places side by side: Thornlie vs Gosnells

Best time to visitThornlie.