United Kingdom · 1991–2020

Best time to visit
Machynlleth.

July leads for comfortable weather in Machynlleth: typically 19.5°C by day, 12.5°C at night, with 86 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high19.5°C

Typical low12.5°C

Rain in July86 mm

Comfort

July

July · August · June

65climate match

Beach

July

July · August · June

29climate match

Outdoors

June

June · July · August

75climate match

The weakest month is January, scoring 5 against July’s 65 — days reach only 8.4°C, 16° below the 24°C the score treats as ideal.

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

58.4° / 2.5°

Feb

118.7° / 2.4°

Mar

2110.5° / 3.6°

Apr

3513° / 5°

May

4915.8° / 7.5°

Jun

5818.1° / 10.4°

Jul

6519.5° / 12.5°

Aug

6419.3° / 12.4°

Sep

5317.6° / 10.3°

Oct

3214.5° / 8.1°

Nov

1411.3° / 5°

Dec

59° / 2.8°

Monthly climate evidence for Machynlleth — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 19 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	8.4°C	2.5°C	102 mm	16	7.8°C	8 h 08	5	Strong coverage
February	8.7°C	2.4°C	82 mm	13.1	7.2°C	9 h 47	11	Strong coverage
March	10.5°C	3.6°C	74 mm	12.6	7.5°C	11 h 40	21	Strong coverage
April	13°C	5°C	60 mm	11.3	9.3°C	13 h 51	35	Strong coverage
May	15.8°C	7.5°C	63 mm	10.4	11.8°C	15 h 43	49	Strong coverage
June	18.1°C	10.4°C	83 mm	11.1	14.6°C	16 h 49	58	Strong coverage
July	19.5°C	12.5°C	86 mm	12.6	16.5°C	16 h 23	65	Strong coverage
August	19.3°C	12.4°C	86 mm	12.7	17.2°C	14 h 43	64	Strong coverage
September	17.6°C	10.3°C	97 mm	13	16.3°C	12 h 35	53	Strong coverage
October	14.5°C	8.1°C	124 mm	15.7	14.1°C	10 h 30	32	Strong coverage
November	11.3°C	5°C	125 mm	17.7	11.5°C	8 h 38	14	Strong coverage
December	9°C	2.8°C	129 mm	17.3	9.4°C	7 h 40	5	Strong coverage

What has changed

Machynlleth runs +1.3°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

+1.0

Feb

+1.7

Mar

+1.9

Apr

+1.9

May

+1.4

Jun

+1.3

Jul

+1.1

Aug

+0.8

Sep

+1.3

Oct

+0.8

Nov

+1.4

Dec

+1.5

July daytime highs, 2011–2025. Last recorded: 20.9°C.

Records at GOGERDDAN, 1960–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.1°C9 Jan 1971	-12.2°C2 Jan 1962	41 mm21 Jan 2018	199 mm2014 · driest 4 mm in 1997	67
February	20.5°C25 Feb 2019	-11.1°C4 Feb 1963	40 mm17 Feb 2024	209 mm2024 · driest 0 mm in 1986	67
March	22.8°C28 Mar 1965	-9.4°C3 Mar 1965	43 mm9 Mar 1981	245 mm1981 · driest 23 mm in 2012	67
April	26.2°C15 Apr 2003	-5.1°C11 Apr 1978	36 mm29 Apr 1991	128 mm1991 · driest 10 mm in 2021	67
May	30.7°C24 May 2026	-2.6°C11 May 1996	59 mm10 May 1979	182 mm1969 · driest 8 mm in 2020	66
June	34.8°C24 Jun 2026	0.6°C1 Jun 1962	63 mm10 Jun 1993	184 mm1993 · driest 8 mm in 1975	67
July	34.6°C19 Jul 2006	2.8°C31 Jul 1965	50 mm3 Jul 2001	190 mm2007 · driest 20 mm in 1999	66
August	32.8°C1 Aug 1990	2.8°C21 Aug 1964	82 mm5 Aug 1973	161 mm1985 · driest 2 mm in 1976	65
September	30.7°C6 Sep 2021	0.0°C22 Sep 1979	37 mm20 Sep 2025	212 mm1984 · driest 11 mm in 2014	65
October	23.9°C4 Oct 1965	-4.3°C29 Oct 1983	53 mm4 Oct 2008	240 mm1981 · driest 22 mm in 2016	64
November	21.1°C1 Nov 2015	-7.4°C23 Nov 1993	62 mm20 Nov 1990	237 mm1970 · driest 42 mm in 2011	65
December	16.4°C6 Dec 2015	-12.4°C13 Dec 1981	59 mm29 Dec 1986	245 mm2015 · driest 10 mm in 1963	66

Typical days per month at GOGERDDAN, 1991–2020
Month	Days 25°C+	Frost nights	Heavy rain (10 mm+)
January	0	9	3
February	0	8	2
March	0	6	2
April	<1	3	2
May	<1	<1	2
June	1	0	2
July	2	0	2
August	1	0	3
September	<1	0	3
October	0	1	4
November	0	4	4
December	0	9	5

How often, not how much — every day in GOGERDDAN’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	0%	53%	9%	70%	6.5–9.8°C
February	<1%	44%	7%	59%	6.2–10.4°C
March	<1%	42%	7%	57%	8.2–11.9°C
April	3%	36%	5%	48%	10.7–14.6°C
May	10%	36%	5%	46%	13.6–17.6°C
June	20%	37%	7%	50%	16.1–19.8°C
July	28%	37%	8%	50%	17.4–21.6°C
August	25%	40%	9%	57%	17.5–21.3°C
September	12%	43%	11%	61%	15.9–18.8°C
October	2%	50%	12%	69%	13.3–16.0°C
November	<1%	56%	13%	74%	9.6–12.3°C
December	0%	55%	14%	71%	6.8–10.6°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.

1960Each stripe is one year’s mean temperature against the 63-year average. Warmest: 2023. Coolest: 1962.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2643251
NOAA station: UKE00105867 · GOGERDDAN
Station distance: 20.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 52.59°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 19 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 GOGERDDAN is what differs

Aberystwyth→Tywyn→Penparcau→Dolgellau→Barmouth→Dyffryn Ardudwy→

Or put two places side by side: Machynlleth vs Aberystwyth

Best time to visitMachynlleth.

July

July

June

The whole year,without the guesswork.

Machynlleth runs +1.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Machynlleth.

The whole year,
without the guesswork.

Machynlleth runs +1.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.