September
September · August · June
79climate match
United States · 1991–2020
Best time to visit
Dunbar.
September leads for comfortable weather in Dunbar: typically 24.2°C by day, 10.5°C at night, with 96 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.2°C
Typical low10.5°C
Rain in September96 mm
July
July · August · June
69climate match
September
September · October · May
71climate match
The weakest month is January, scoring 5 against September’s 79 — days reach only -2.4°C, 26° 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
5-2.4° / -12.5°
Feb
50.3° / -10.2°
Mar
77.6° / -3.7°
Apr
3415.4° / 2.5°
May
6021.6° / 9.3°
Jun
6627° / 15.3°
Jul
6528.7° / 17.2°
Aug
7227.5° / 15.5°
Sep
7924.2° / 10.5°
Oct
4816.8° / 3.8°
Nov
118.1° / -2.9°
Dec
50.9° / -8.9°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.4°C | -12.5°C | 26 mm | 5 | 9 h 26 | 5 | Strong coverage |
| February | 0.3°C | -10.2°C | 30 mm | 5.3 | 10 h 31 | 5 | Strong coverage |
| March | 7.6°C | -3.7°C | 53 mm | 6.1 | 11 h 48 | 7 | Strong coverage |
| April | 15.4°C | 2.5°C | 100 mm | 9.3 | 13 h 17 | 34 | Strong coverage |
| May | 21.6°C | 9.3°C | 135 mm | 11.3 | 14 h 32 | 60 | Strong coverage |
| June | 27°C | 15.3°C | 157 mm | 10.4 | 15 h 13 | 66 | Strong coverage |
| July | 28.7°C | 17.2°C | 117 mm | 8 | 14 h 57 | 65 | Strong coverage |
| August | 27.5°C | 15.5°C | 114 mm | 7.9 | 13 h 52 | 72 | Strong coverage |
| September | 24.2°C | 10.5°C | 96 mm | 7.2 | 12 h 26 | 79 | Strong coverage |
| October | 16.8°C | 3.8°C | 69 mm | 7.1 | 11 h | 48 | Strong coverage |
| November | 8.1°C | -2.9°C | 50 mm | 5.1 | 9 h 45 | 11 | Strong coverage |
| December | 0.9°C | -8.9°C | 35 mm | 5.4 | 9 h 08 | 5 | Strong coverage |
What has changed
Dunbar runs +0.4°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
+0.6
Feb
-0.3
Mar
+1.2
Apr
-0.5
May
-0.3
Jun
+0.3
Jul
-0.5
Aug
-0.3
Sep
+1.6
Oct
+0.2
Nov
+0.4
Dec
+2.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.3°C27 Jan 2002 | -36.7°C16 Jan 2009 | 39 mm22 Jan 2018 | 101 mm1909 · driest 0 mm in 1948 | 129 |
| February | 24.4°C27 Feb 2024 | -37.2°C3 Feb 1996 | 51 mm28 Feb 1948 | 107 mm1915 · driest 1 mm in 1946 | 132 |
| March | 32.2°C30 Mar 1986 | -35.6°C1 Mar 1962 | 59 mm13 Mar 1990 | 182 mm1990 · driest 0 mm in 1994 | 132 |
| April | 34.4°C23 Apr 1980 | -15.6°C6 Apr 1982 | 71 mm18 Apr 2013 | 206 mm2008 · driest 6 mm in 1948 | 132 |
| May | 40.0°C31 May 1934 | -6.7°C4 May 1907 | 105 mm23 May 2004 | 405 mm2013 · driest 15 mm in 1948 | 132 |
| June | 40.6°C28 Jun 1934 | 1.7°C4 Jun 1945 | 125 mm8 Jun 1924 | 371 mm1998 · driest 15 mm in 1933 | 133 |
| July | 44.4°C14 Jul 1936 | 5.6°C22 Jul 1947 | 167 mm14 Jul 1962 | 346 mm1993 · driest 0 mm in 1947 | 131 |
| August | 42.8°C8 Aug 1934 | 1.7°C30 Aug 1915 | 141 mm16 Aug 1977 | 379 mm1987 · driest 4 mm in 2013 | 132 |
| September | 39.4°C7 Sep 1939 | -6.7°C28 Sep 1942 | 129 mm19 Sep 1926 | 407 mm1926 · driest 5 mm in 2024 | 130 |
| October | 34.4°C2 Oct 1953 | -19.4°C30 Oct 1925 | 104 mm1 Oct 1911 | 190 mm2009 · driest 1 mm in 1952 | 132 |
| November | 27.2°C1 Nov 1938 | -23.9°C26 Nov 1977 | 96 mm4 Nov 2003 | 202 mm1931 · driest 1 mm in 1954 | 130 |
| December | 22.8°C16 Dec 2021 | -33.3°C19 Dec 1985 | 66 mm14 Dec 2015 | 142 mm2015 · driest 3 mm in 1980 | 129 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 4 |
| February | 0 | 0 | 26 | <1 | 4 |
| March | <1 | 0 | 24 | 2 | 2 |
| April | 3 | <1 | 10 | 3 | <1 |
| May | 10 | 2 | 1 | 4 | <1 |
| June | 22 | 8 | 0 | 5 | 0 |
| July | 27 | 12 | 0 | 4 | 0 |
| August | 25 | 8 | 0 | 3 | 0 |
| September | 15 | 4 | <1 | 3 | 0 |
| October | 4 | <1 | 9 | 2 | <1 |
| November | <1 | 0 | 21 | 2 | 1 |
| December | 0 | 0 | 29 | <1 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 16% | 2% | 11% | -6.5–2.0°C |
| February | <1% | 17% | 3% | 12% | -3.8–4.3°C |
| March | 6% | 21% | 6% | 22% | 3.0–11.2°C |
| April | 23% | 28% | 10% | 35% | 12.5–18.7°C |
| May | 48% | 32% | 12% | 40% | 19.6–25.2°C |
| June | 66% | 32% | 13% | 38% | 25.1–29.8°C |
| July | 75% | 25% | 11% | 27% | 27.5–32.3°C |
| August | 75% | 25% | 10% | 26% | 26.6–31.2°C |
| September | 63% | 24% | 10% | 26% | 22.3–26.9°C |
| October | 34% | 21% | 7% | 20% | 14.9–21.2°C |
| November | 5% | 17% | 5% | 13% | 4.8–11.6°C |
| December | <1% | 16% | 3% | 11% | -3.2–4.7°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 4854605
- NOAA station
- USC00135198 · MARSHALLTOWN
- Station distance
- 17.4 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 41.94°, 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.