September
September · June · May
77climate match
United States · 1991–2020
Best time to visit
Bath.
September leads for comfortable weather in Bath: typically 24.7°C by day, 12.6°C at night, with 123 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.7°C
Typical low12.6°C
Rain in September123 mm
August
August · July · June
67climate match
May
May · October · April
75climate 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.
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° / -6°
Feb
54.8° / -5.2°
Mar
119.9° / -1.2°
Apr
4416.9° / 4.3°
May
7222.5° / 10°
Jun
7327.2° / 15.2°
Jul
5729.7° / 17.8°
Aug
6628.6° / 16.8°
Sep
7724.7° / 12.6°
Oct
5118.1° / 6.2°
Nov
2311.6° / 0.8°
Dec
55.7° / -3.2°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 3.1°C | -6°C | 84 mm | 8.3 | 9 h 33 | 5 | Strong coverage |
| February | 4.8°C | -5.2°C | 70 mm | 8 | 10 h 35 | 5 | Strong coverage |
| March | 9.9°C | -1.2°C | 92 mm | 8.8 | 11 h 49 | 11 | Strong coverage |
| April | 16.9°C | 4.3°C | 93 mm | 9 | 13 h 14 | 44 | Strong coverage |
| May | 22.5°C | 10°C | 93 mm | 9.3 | 14 h 25 | 72 | Strong coverage |
| June | 27.2°C | 15.2°C | 112 mm | 9.2 | 15 h 04 | 73 | Strong coverage |
| July | 29.7°C | 17.8°C | 135 mm | 9.2 | 14 h 49 | 57 | Strong coverage |
| August | 28.6°C | 16.8°C | 116 mm | 8.4 | 13 h 47 | 66 | Strong coverage |
| September | 24.7°C | 12.6°C | 123 mm | 7.6 | 12 h 25 | 77 | Strong coverage |
| October | 18.1°C | 6.2°C | 105 mm | 7.8 | 11 h 03 | 51 | Strong coverage |
| November | 11.6°C | 0.8°C | 82 mm | 7.1 | 9 h 51 | 23 | Strong coverage |
| December | 5.7°C | -3.2°C | 98 mm | 9.1 | 9 h 16 | 5 | Strong coverage |
What has changed
Bath 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
+2.1
Feb
+2.5
Mar
+1.4
Apr
+1.4
May
+1.3
Jun
+0.8
Jul
+1.4
Aug
+0.8
Sep
+1.4
Oct
+1.3
Nov
+0.8
Dec
+2.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.2°C26 Jan 1950 | -26.1°C21 Jan 1994 | 60 mm5 Jan 1949 | 214 mm1979 · driest 17 mm in 1981 | 79 |
| February | 27.2°C21 Feb 2018 | -22.2°C6 Feb 1996 | 75 mm13 Feb 2008 | 194 mm2008 · driest 14 mm in 2002 | 79 |
| March | 30.6°C30 Mar 1998 | -18.3°C19 Mar 1967 | 76 mm11 Mar 1952 | 183 mm1953 · driest 23 mm in 2006 | 79 |
| April | 33.9°C18 Apr 1976 | -8.9°C7 Apr 1982 | 88 mm2 Apr 2005 | 256 mm1952 · driest 16 mm in 1985 | 79 |
| May | 36.1°C19 May 1962 | -1.7°C14 May 1996 | 82 mm31 May 1972 | 270 mm1984 · driest 2 mm in 1964 | 79 |
| June | 37.8°C27 Jun 1966 | 3.9°C11 Jun 1972 | 89 mm18 Jun 1967 | 232 mm2006 · driest 9 mm in 1949 | 79 |
| July | 40.6°C3 Jul 1966 | 7.8°C3 Jul 2001 | 144 mm10 Jul 2010 | 265 mm1969 · driest 8 mm in 1999 | 79 |
| August | 37.8°C5 Aug 1955 | 5.0°C30 Aug 1986 | 139 mm4 Aug 2020 | 342 mm2011 · driest 19 mm in 1995 | 78 |
| September | 37.2°C2 Sep 1980 | -0.6°C24 Sep 1963 | 162 mm16 Sep 1999 | 330 mm2011 · driest 15 mm in 2007 | 78 |
| October | 33.9°C2 Oct 2019 | -6.1°C31 Oct 1988 | 221 mm8 Oct 2005 | 334 mm2005 · driest 1 mm in 2024 | 78 |
| November | 27.2°C1 Nov 1950 | -11.7°C30 Nov 1976 | 88 mm2 Nov 2018 | 247 mm2018 · driest 17 mm in 1976 | 78 |
| December | 22.2°C29 Dec 1984 | -22.2°C28 Dec 1950 | 68 mm6 Dec 1953 | 219 mm2023 · driest 10 mm in 1955 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 3 | 5 |
| February | <1 | 0 | 24 | 2 | 4 |
| March | <1 | <1 | 19 | 3 | 3 |
| April | 3 | <1 | 6 | 3 | <1 |
| May | 11 | 4 | <1 | 3 | 0 |
| June | 23 | 9 | 0 | 4 | 0 |
| July | 29 | 16 | 0 | 4 | 0 |
| August | 28 | 11 | 0 | 3 | 0 |
| September | 15 | 4 | 0 | 4 | 0 |
| October | 3 | <1 | 3 | 3 | 0 |
| November | <1 | 0 | 15 | 3 | <1 |
| December | 0 | 0 | 24 | 3 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 28% | 9% | 32% | -1.2–5.9°C |
| February | <1% | 28% | 9% | 32% | 1.1–8.1°C |
| March | 6% | 29% | 10% | 34% | 6.7–12.7°C |
| April | 22% | 31% | 11% | 40% | 14.5–18.7°C |
| May | 51% | 31% | 11% | 41% | 20.0–24.6°C |
| June | 69% | 30% | 11% | 33% | 25.4–28.5°C |
| July | 72% | 28% | 12% | 29% | 27.6–31.5°C |
| August | 73% | 27% | 11% | 28% | 26.9–29.8°C |
| September | 65% | 25% | 11% | 26% | 22.5–26.4°C |
| October | 31% | 22% | 9% | 22% | 16.0–20.4°C |
| November | 5% | 26% | 9% | 27% | 9.1–13.9°C |
| December | <1% | 28% | 11% | 34% | 1.6–7.9°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 5179193
- NOAA station
- USW00014737 · ALLENTOWN LEHIGH VLY INTL AP
- Station distance
- 9.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 40.73°, 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.