September
September · August · May
84climate match
United States · 1991–2020
Best time to visit
Dubuque.
September leads for comfortable weather in Dubuque: typically 24°C by day, 12.8°C at night, with 94 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24°C
Typical low12.8°C
Rain in September94 mm
August
August · July · June
71climate match
May
May · October · September
71climate match
The weakest month is January, scoring 5 against September’s 84 — 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° / -11.5°
Feb
50.2° / -9.8°
Mar
67.2° / -2.9°
Apr
3514.9° / 3.8°
May
6621.7° / 10.2°
Jun
6627.3° / 16.1°
Jul
5829.2° / 18.4°
Aug
7027.9° / 17.5°
Sep
8424° / 12.8°
Oct
4916.4° / 6°
Nov
117.7° / -0.9°
Dec
50.6° / -7.4°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.4°C | -11.5°C | 33 mm | 5.6 | 9 h 23 | 5 | Strong coverage |
| February | 0.2°C | -9.8°C | 37 mm | 5.9 | 10 h 29 | 5 | Strong coverage |
| March | 7.2°C | -2.9°C | 54 mm | 7 | 11 h 48 | 6 | Strong coverage |
| April | 14.9°C | 3.8°C | 96 mm | 9.3 | 13 h 18 | 35 | Strong coverage |
| May | 21.7°C | 10.2°C | 113 mm | 11 | 14 h 35 | 66 | Strong coverage |
| June | 27.3°C | 16.1°C | 142 mm | 10.4 | 15 h 17 | 66 | Strong coverage |
| July | 29.2°C | 18.4°C | 135 mm | 7.9 | 15 h 00 | 58 | Strong coverage |
| August | 27.9°C | 17.5°C | 96 mm | 7.6 | 13 h 54 | 70 | Strong coverage |
| September | 24°C | 12.8°C | 94 mm | 7.5 | 12 h 26 | 84 | Strong coverage |
| October | 16.4°C | 6°C | 77 mm | 7.3 | 10 h 59 | 49 | Strong coverage |
| November | 7.7°C | -0.9°C | 59 mm | 6.6 | 9 h 42 | 11 | Strong coverage |
| December | 0.6°C | -7.4°C | 44 mm | 7 | 9 h 05 | 5 | Strong coverage |
What has changed
Dubuque runs +0.1°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
0.0
Feb
-0.8
Mar
+0.6
Apr
-1.2
May
-0.2
Jun
+0.7
Jul
+0.2
Aug
+0.1
Sep
+1.3
Oct
-0.3
Nov
-0.3
Dec
+1.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 16.1°C17 Jan 1990 | -38.3°C17 Jan 2009 | 41 mm13 Jan 1960 | 102 mm1960 · driest 0 mm in 2025 | 86 |
| February | 22.8°C23 Feb 2017 | -35.6°C4 Feb 1996 | 45 mm9 Feb 2001 | 88 mm2023 · driest 0 mm in 1987 | 86 |
| March | 30.6°C29 Mar 1986 | -35.6°C1 Mar 1962 | 56 mm31 Mar 1998 | 142 mm1991 · driest 7 mm in 1981 | 87 |
| April | 33.9°C22 Apr 1980 | -11.7°C6 Apr 1982 | 72 mm18 Apr 2013 | 206 mm2026 · driest 20 mm in 1946 | 85 |
| May | 35.0°C29 May 2018 | -1.7°C12 May 2006 | 114 mm13 May 1978 | 220 mm2004 · driest 17 mm in 1958 | 86 |
| June | 38.3°C21 Jun 1988 | 4.4°C2 Jun 1946 | 123 mm4 Jun 2002 | 363 mm1969 · driest 17 mm in 1988 | 85 |
| July | 42.2°C14 Jul 1995 | 7.8°C29 Jul 1981 | 224 mm28 Jul 2011 | 374 mm2011 · driest 8 mm in 1946 | 85 |
| August | 40.0°C17 Aug 1988 | 6.1°C6 Aug 1994 | 134 mm2 Aug 1972 | 238 mm1972 · driest 1 mm in 1969 | 84 |
| September | 36.1°C10 Sep 2013 | -1.7°C24 Sep 1989 | 114 mm13 Sep 1972 | 272 mm1986 · driest 6 mm in 2017 | 85 |
| October | 33.3°C4 Oct 1997 | -7.2°C26 Oct 1942 | 76 mm31 Oct 2024 | 199 mm2018 · driest 0 mm in 1952 | 85 |
| November | 23.9°C2 Nov 2000 | -22.2°C26 Nov 1977 | 91 mm4 Nov 2003 | 202 mm2003 · driest 1 mm in 1976 | 85 |
| December | 20.0°C16 Dec 2021 | -34.4°C27 Dec 1950 | 54 mm8 Dec 1966 | 121 mm2015 · driest 5 mm in 1975 | 85 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 5 |
| February | 0 | 0 | 26 | 1 | 4 |
| March | <1 | 0 | 22 | 2 | 2 |
| April | 2 | <1 | 6 | 3 | <1 |
| May | 10 | 2 | <1 | 4 | 0 |
| June | 22 | 9 | 0 | 4 | 0 |
| July | 27 | 13 | 0 | 4 | 0 |
| August | 25 | 9 | 0 | 3 | 0 |
| September | 14 | 4 | 0 | 3 | 0 |
| October | 3 | <1 | 3 | 2 | <1 |
| November | 0 | 0 | 17 | 2 | <1 |
| December | 0 | 0 | 27 | 1 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 17% | 2% | 14% | -5.6–1.2°C |
| February | <1% | 17% | 3% | 14% | -3.2–4.5°C |
| March | 4% | 22% | 6% | 23% | 3.4–10.7°C |
| April | 18% | 30% | 10% | 36% | 12.0–18.2°C |
| May | 45% | 32% | 10% | 41% | 19.2–24.3°C |
| June | 66% | 31% | 13% | 37% | 24.6–28.8°C |
| July | 75% | 25% | 10% | 24% | 27.0–31.1°C |
| August | 75% | 24% | 11% | 25% | 26.1–29.6°C |
| September | 61% | 24% | 9% | 25% | 21.5–25.9°C |
| October | 27% | 22% | 7% | 23% | 14.4–19.3°C |
| November | 3% | 21% | 6% | 18% | 4.4–10.8°C |
| December | 0% | 19% | 4% | 16% | -3.4–4.1°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 4854529
- NOAA station
- USC00132364 · DUBUQUE L&D 11
- Station distance
- 4.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 42.50°, 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.