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Australia · 1991–2020

Best time to visit
Dayton.

October leads for comfortable weather in Dayton: typically 23.7°C by day, 10.8°C at night, with 34 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high23.7°C

Typical low10.8°C

Rain in October34 mm

Comfort

October

October · April · November

89climate match

Beach

March

March · December · January

84climate match

Outdoors

October

October · September · May

84climate match

The weakest month is July, scoring 45 against October’s 89 — days reach only 18.5°C, 5° below the 24°C the score treats as ideal, and 138 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

6832.3° / 17.6°

Feb

6732.3° / 17.8°

Mar

7830.1° / 16.3°

Apr

8826.4° / 13.5°

May

7522.4° / 10.6°

Jun

5419.5° / 9°

Jul

4518.5° / 8.2°

Aug

5119.1° / 8.3°

Sep

6520.5° / 9.1°

Oct

8923.7° / 10.8°

Nov

8627° / 13.4°

Dec

7830.2° / 15.7°

Monthly climate evidence for Dayton — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 33 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	32.3°C	17.6°C	16 mm	1.4	21.8°C	14 h 01	68	Strong coverage
February	32.3°C	17.8°C	17 mm	1.2	22.3°C	13 h 16	67	Strong coverage
March	30.1°C	16.3°C	18 mm	2.5	22.3°C	12 h 22	78	Strong coverage
April	26.4°C	13.5°C	31 mm	4.2	22.1°C	11 h 21	88	Strong coverage
May	22.4°C	10.6°C	81 mm	8.6	21.6°C	10 h 31	75	Strong coverage
June	19.5°C	9°C	124 mm	12	20.8°C	10 h 05	54	Strong coverage
July	18.5°C	8.2°C	138 mm	14	19.9°C	10 h 15	45	Strong coverage
August	19.1°C	8.3°C	122 mm	12.7	19.1°C	10 h 58	51	Strong coverage
September	20.5°C	9.1°C	79 mm	10.8	18.7°C	11 h 56	65	Strong coverage
October	23.7°C	10.8°C	34 mm	5.4	18.8°C	12 h 56	89	Strong coverage
November	27°C	13.4°C	29 mm	3.9	19.8°C	13 h 48	86	Strong coverage
December	30.2°C	15.7°C	10 mm	1.9	20.8°C	14 h 13	78	Strong coverage

What has changed

Dayton runs +1.5°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+1.5

Feb

+1.1

Mar

+1.1

Apr

+1.7

May

+1.2

Jun

+1.0

Jul

+1.0

Aug

+1.4

Sep

+1.5

Oct

+2.1

Nov

+2.3

Dec

+2.5

October daytime highs, 2011–2025. Last recorded: 23.9°C.

Records at PERTH AIRPORT, 1944–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	46.0°C31 Jan 1991	6.0°C8 Jan 1945	90 mm16 Jan 2018	102 mm2000 · driest 0 mm in 2021	82
February	46.7°C23 Feb 1991	5.7°C13 Feb 1981	132 mm9 Feb 1992	150 mm1992 · driest 0 mm in 1948	82
March	43.8°C10 Mar 2003	3.1°C27 Mar 2007	52 mm28 Mar 2026	63 mm2026 · driest 0 mm in 1962	82
April	39.6°C11 Apr 2020	1.2°C27 Apr 1960	61 mm17 Apr 2002	135 mm2008 · driest 0 mm in 2017	82
May	35.3°C1 May 2002	-0.4°C29 May 1964	57 mm3 May 1947	229 mm1967 · driest 12 mm in 2019	82
June	27.8°C5 Jun 1975	-1.3°C17 Jun 2006	78 mm10 Jun 1945	424 mm1945 · driest 23 mm in 2013	83
July	25.7°C21 Jul 1994	-1.0°C3 Jul 2010	99 mm30 Jul 2001	447 mm1958 · driest 31 mm in 2012	83
August	30.2°C31 Aug 2023	0.1°C15 Aug 2004	66 mm8 Aug 1977	340 mm1955 · driest 19 mm in 2008	82
September	34.9°C27 Sep 2023	-0.2°C1 Sep 1956	60 mm14 Sep 1984	172 mm2013 · driest 12 mm in 1969	82
October	37.7°C26 Oct 1961	1.2°C10 Oct 2005	60 mm18 Oct 1995	125 mm1971 · driest 1 mm in 1969	82
November	41.1°C16 Nov 2019	3.2°C18 Nov 2004	41 mm15 Nov 1948	89 mm2020 · driest 1 mm in 1957	82
December	44.5°C26 Dec 2007	4.8°C2 Dec 2002	36 mm13 Dec 2011	67 mm2011 · driest 0 mm in 2023	82

Typical days per month at PERTH AIRPORT, 1991–2020
Month	Days 25°C+	Days 30°C+	Heavy rain (10 mm+)
January	29	21	<1
February	27	20	<1
March	27	15	<1
April	18	6	<1
May	6	<1	3
June	<1	0	4
July	<1	0	5
August	<1	0	5
September	3	<1	3
October	10	2	<1
November	18	8	1
December	26	14	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was April (scoring 91); on 2011–2025 it is October (92). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in PERTH AIRPORT’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	96%	4%	<1%	1%	29.6–34.0°C
February	95%	5%	2%	3%	29.7–34.5°C
March	92%	8%	2%	5%	28.1–31.6°C
April	81%	18%	4%	19%	23.8–27.8°C
May	57%	31%	11%	42%	20.5–23.7°C
June	24%	45%	18%	63%	17.8–20.3°C
July	13%	47%	19%	66%	16.9–19.3°C
August	22%	42%	14%	55%	17.5–19.9°C
September	43%	34%	8%	44%	18.9–21.8°C
October	69%	22%	4%	22%	20.7–24.8°C
November	84%	14%	3%	10%	23.9–28.3°C
December	93%	7%	<1%	3%	26.9–31.6°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.

1945Each stripe is one year’s mean temperature against the 81-year average. Warmest: 2024. Coolest: 1968.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 10048440
NOAA station: ASN00009021 · PERTH AIRPORT
Station distance: 8.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude -31.85°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 33 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 PERTH AIRPORT is what differs

Forrestfield→High Wycombe→Bassendean→Beechboro→Cloverdale→Swan View→

Or put two places side by side: Dayton vs Forrestfield

Best time to visitDayton.

October

March

October

The whole year,without the guesswork.

Dayton runs +1.5°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Dayton.

The whole year,
without the guesswork.

Dayton runs +1.5°C
on the 1961–1990 baseline.

Nearby, measured,
and named.