Dubuque weather in September: Dubuque, Iowa: normal highs, lows, rain and records for September
Dubuque in September has a normal high of 73°F and a normal low of 52°F, a daily mean of 62°F, falling from 77°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 3.82 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 23°C and low of 11°C, 97 mm of precipitation in September.
- NOAA stationDubuque Regional Airport
- Station IDUSW00094908
- Location42.40°N 90.70°W
- Elevation1,056 ft (322 m)
- Population58,987
- Jan 27° 11°
- Feb 31° 15°
- Mar 44° 26°
- Apr 58° 37°
- May 69° 49°
- Jun 79° 59°
- Jul 82° 62°
- Aug 80° 60°
- Sep 73° 52°
- Oct 60° 40°
- Nov 45° 28°
- Dec 32° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Dubuque in September?
The normal high is 73°F and the normal low 52°F, for a daily mean of 62.3°F. September is 7.5°F cooler than August and 12.4°F warmer than October. September is the 4th warmest month of the year in Dubuque and the 6th wettest. Across the month the normal high falls 10°F, from 77°F on September 1 to 67°F on September 30. From one year to the next September's mean temperature typically moves about 2.8°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 60°F and 65°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 77°F | 57°F | 29% | 20% |
| September 8 | 76°F | 55°F | 30% | 20% |
| September 15 | 73°F | 52°F | 30% | 20% |
| September 22 | 71°F | 49°F | 30% | 20% |
| September 30 | 67°F | 46°F | 29% | 19% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 77°F | 57°F | 29% | 20% | 13 h 10 min |
| September 2 | 77°F | 57°F | 29% | 20% | 13 h 10 min |
| September 3 | 77°F | 57°F | 29% | 20% | 13 h 10 min |
| September 4 | 77°F | 56°F | 29% | 20% | 13 h |
| September 5 | 76°F | 56°F | 30% | 20% | 13 h |
| September 6 | 76°F | 56°F | 30% | 20% | 13 h |
| September 7 | 76°F | 55°F | 30% | 20% | 13 h |
| September 8 | 76°F | 55°F | 30% | 20% | 12 h 50 min |
| September 9 | 75°F | 54°F | 30% | 20% | 12 h 50 min |
| September 10 | 75°F | 54°F | 30% | 20% | 12 h 50 min |
| September 11 | 75°F | 54°F | 30% | 20% | 12 h 40 min |
| September 12 | 74°F | 53°F | 30% | 20% | 12 h 40 min |
| September 13 | 74°F | 53°F | 30% | 20% | 12 h 40 min |
| September 14 | 74°F | 53°F | 30% | 20% | 12 h 40 min |
| September 15 | 73°F | 52°F | 30% | 20% | 12 h 30 min |
| September 16 | 73°F | 52°F | 30% | 20% | 12 h 30 min |
| September 17 | 73°F | 51°F | 30% | 20% | 12 h 30 min |
| September 18 | 72°F | 51°F | 30% | 20% | 12 h 30 min |
| September 19 | 72°F | 51°F | 30% | 20% | 12 h 20 min |
| September 20 | 72°F | 50°F | 30% | 20% | 12 h 20 min |
| September 21 | 71°F | 50°F | 30% | 20% | 12 h 20 min |
| September 22 | 71°F | 49°F | 30% | 20% | 12 h 10 min |
| September 23 | 70°F | 49°F | 29% | 20% | 12 h 10 min |
| September 24 | 70°F | 49°F | 29% | 20% | 12 h 10 min |
| September 25 | 70°F | 48°F | 29% | 20% | 12 h 10 min |
| September 26 | 69°F | 48°F | 29% | 20% | 12 h |
| September 27 | 69°F | 47°F | 29% | 19% | 12 h |
| September 28 | 68°F | 47°F | 29% | 19% | 12 h |
| September 29 | 68°F | 46°F | 29% | 19% | 11 h 50 min |
| September 30 | 67°F | 46°F | 29% | 19% | 11 h 50 min |
- Normal high
- 73°FSeptember average
- Normal low
- 52°FSeptember average
- Precipitation
- 3.82 inmonth total
- Days with precipitation
- 90.01 inch or more
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 20
- Days at 80°F or more
- 8
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094908; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Dubuque in September?
On a given September day the chance of 0.01 inch or more is 30% on average, highest around September 10 (30%). In all, 3.82 in falls on 9 days of a normal September, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094908.
How humid and windy is Dubuque in September?
At 3 p.m. the normal temperature is 65°F with 51% relative humidity and a dew point of 47°F; at 6 a.m. it is 49°F with 87% humidity. The wind averages 9.1 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 49°F | 45°F | 87% | 7.5 mph | 63% |
| 9 a.m. | 57°F | 48°F | 72% | 10.6 mph | 66% |
| noon | 63°F | 48°F | 57% | 11.8 mph | 56% |
| 3 p.m. | 65°F | 47°F | 51% | 11.8 mph | 68% |
| 6 p.m. | 59°F | 47°F | 65% | 7.7 mph | 65% |
| 9 p.m. | 55°F | 47°F | 74% | 8.0 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094908. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Dubuque?
The warmest September temperature on Dubuque's official record (since 1874) is 99°F, on September 6, 1922; the coldest is 24°F, on September 30, 1899. The wettest September brought 15.46 in (1965).
The September mean against the 1991-2020 normal of 62.3°F: 2021 65.8°F (+3.5), 2022 64.0°F (+1.7), 2023 66.1°F (+3.8), 2024 66.6°F (+4.3), 2026 66.8°F (+4.5). 5 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.8°F | +3.5°F | 1.30 in |
| 2022 | 64.0°F | +1.7°F | 0.60 in |
| 2023 | 66.1°F | +3.8°F | 2.37 in |
| 2024 | 66.6°F | +4.3°F | 0.08 in |
| 2026 | 66.8°F | +4.5°F | 9.41 in |
Source: records: ACIS, NWS threaded record DBQthr; recent months: ACIS, station USW00094908. Records and recent months use complete months only.
How does September in Dubuque compare across Iowa?
Across the 132 places PlainClimate covers in Iowa, September normal highs run from 71°F in Northwood to 79°F in Glenwood; Dubuque's is 73°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.