September
September · June · August
77climate match
United States · 1991–2020
Best time to visit
Wales.
September leads for comfortable weather in Wales: typically 26°C by day, 5.9°C at night, with 22 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high26°C
Typical low5.9°C
Rain in September22 mm
August
August · July · June
66climate match
May
May · October · September
82climate match
The weakest month is January, scoring 5 against September’s 77 — days reach only 3.1°C, 21° below the 24°C the score treats as ideal, and nights drop to -10.4°C.
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
53.1° / -10.4°
Feb
56° / -7.8°
Mar
2712.3° / -3.6°
Apr
4416.3° / -1.1°
May
6921.5° / 2.9°
Jun
7427.3° / 6.7°
Jul
6831.6° / 11.2°
Aug
7130.4° / 10.6°
Sep
7726° / 5.9°
Oct
5518.7° / 0°
Nov
1910.7° / -5.7°
Dec
53.1° / -10.6°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 3.1°C | -10.4°C | 23 mm | 3.9 | 9 h 40 | 5 | Strong coverage |
| February | 6°C | -7.8°C | 24 mm | 4.4 | 10 h 39 | 5 | Strong coverage |
| March | 12.3°C | -3.6°C | 21 mm | 4 | 11 h 49 | 27 | Strong coverage |
| April | 16.3°C | -1.1°C | 22 mm | 4.7 | 13 h 11 | 44 | Strong coverage |
| May | 21.5°C | 2.9°C | 19 mm | 3.8 | 14 h 19 | 69 | Good coverage |
| June | 27.3°C | 6.7°C | 14 mm | 2.8 | 14 h 56 | 74 | Strong coverage |
| July | 31.6°C | 11.2°C | 18 mm | 2.7 | 14 h 42 | 68 | Strong coverage |
| August | 30.4°C | 10.6°C | 18 mm | 3.3 | 13 h 43 | 71 | Strong coverage |
| September | 26°C | 5.9°C | 22 mm | 3.6 | 12 h 24 | 77 | Strong coverage |
| October | 18.7°C | 0°C | 22 mm | 3.5 | 11 h 05 | 55 | Strong coverage |
| November | 10.7°C | -5.7°C | 20 mm | 3.1 | 9 h 57 | 19 | Strong coverage |
| December | 3.1°C | -10.6°C | 26 mm | 3.9 | 9 h 24 | 5 | Strong coverage |
What has changed
Wales runs +0.7°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
+0.4
Mar
+1.4
Apr
+0.2
May
-0.8
Jun
+0.9
Jul
+0.3
Aug
+0.3
Sep
+0.8
Oct
+0.2
Nov
+1.9
Dec
+1.4
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.9°C11 Jan 1956 | -34.4°C22 Jan 1937 | 26 mm18 Jan 1983 | 116 mm1916 · driest 0 mm in 1961 | 111 |
| February | 20.6°C25 Feb 1986 | -34.4°C10 Feb 1933 | 26 mm20 Feb 1996 | 77 mm1962 · driest 0 mm in 2019 | 113 |
| March | 29.4°C25 Mar 2026 | -22.2°C8 Mar 1964 | 48 mm1 Mar 2000 | 77 mm1916 · driest 0 mm in 1956 | 112 |
| April | 31.7°C30 Apr 1943 | -12.8°C3 Apr 1917 | 29 mm16 Apr 1920 | 96 mm1914 · driest 0 mm in 1949 | 111 |
| May | 34.4°C28 May 2003 | -9.4°C9 May 1948 | 40 mm20 May 1975 | 70 mm1917 · driest 0 mm in 1948 | 110 |
| June | 38.9°C21 Jun 1937 | -4.4°C14 Jun 1976 | 38 mm7 Jun 1984 | 65 mm1943 · driest 0 mm in 1933 | 113 |
| July | 41.7°C24 Jul 1931 | -1.1°C3 Jul 1921 | 43 mm26 Jul 1914 | 103 mm1914 · driest 0 mm in 1996 | 113 |
| August | 39.4°C13 Aug 1940 | -2.2°C16 Aug 1987 | 40 mm4 Aug 1913 | 79 mm2000 · driest 0 mm in 2020 | 113 |
| September | 37.2°C4 Sep 1934 | -9.4°C18 Sep 1965 | 29 mm29 Sep 1982 | 115 mm1982 · driest 0 mm in 1974 | 111 |
| October | 31.7°C7 Oct 1979 | -18.3°C30 Oct 2019 | 39 mm20 Oct 2004 | 96 mm2004 · driest 0 mm in 2020 | 109 |
| November | 26.1°C1 Nov 1960 | -25.0°C24 Nov 1931 | 35 mm7 Nov 1915 | 55 mm1982 · driest 0 mm in 1956 | 111 |
| December | 18.9°C1 Dec 1995 | -32.8°C25 Dec 1924 | 60 mm21 Dec 1983 | 152 mm2010 · driest 0 mm in 1917 | 111 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | <1 | 3 |
| February | 0 | 0 | 25 | <1 | 3 |
| March | <1 | 0 | 26 | <1 | 1 |
| April | 1 | 0 | 18 | <1 | <1 |
| May | 9 | 1 | 6 | <1 | <1 |
| June | 21 | 10 | <1 | <1 | 0 |
| July | 29 | 23 | 0 | <1 | 0 |
| August | 28 | 19 | <1 | <1 | 0 |
| September | 19 | 5 | 2 | <1 | 0 |
| October | 4 | <1 | 15 | <1 | <1 |
| November | 0 | 0 | 25 | <1 | 2 |
| December | 0 | 0 | 28 | <1 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 15% | 2% | 10% | -0.8–5.8°C |
| February | <1% | 18% | 2% | 14% | 2.2–8.8°C |
| March | 7% | 17% | 2% | 11% | 8.1–13.7°C |
| April | 31% | 16% | 1% | 12% | 13.8–19.6°C |
| May | 63% | 15% | 2% | 10% | 18.6–24.9°C |
| June | 86% | 10% | 1% | 5% | 24.5–30.6°C |
| July | 88% | 12% | 1% | 8% | 29.4–33.5°C |
| August | 85% | 15% | 2% | 8% | 28.3–32.5°C |
| September | 81% | 14% | 3% | 9% | 24.0–28.6°C |
| October | 48% | 14% | 3% | 9% | 15.8–22.3°C |
| November | 6% | 13% | 2% | 7% | 7.0–14.0°C |
| December | 0% | 15% | 2% | 8% | 0.2–7.1°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.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 5549145
- NOAA station
- USC00425837 · MORONI
- Station distance
- 6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 24 usable years
- Daylight
- Calculated from latitude 39.49°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.