Dubuque weather in August: Dubuque, Iowa: normal highs, lows, rain and records for August
Dubuque in August has a normal high of 80°F and a normal low of 60°F, a daily mean of 70°F, falling from 81°F on the 1st to 78°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 3.95 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 16°C, 100 mm of precipitation in August.
- 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 August?
The normal high is 80°F and the normal low 60°F, for a daily mean of 69.8°F. August is 1.9°F cooler than July and 7.5°F warmer than September. August is the 2nd warmest month of the year in Dubuque and the 5th wettest. Across the month the normal high falls 3°F, from 81°F on August 1 to 78°F on August 31. From one year to the next August's mean temperature typically moves about 2.6°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 67°F and 72°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 |
|---|---|---|---|---|
| August 1 | 81°F | 62°F | 30% | 20% |
| August 8 | 81°F | 61°F | 30% | 20% |
| August 15 | 80°F | 60°F | 29% | 20% |
| August 22 | 79°F | 59°F | 29% | 19% |
| August 31 | 78°F | 57°F | 29% | 20% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 81°F | 62°F | 30% | 20% | 14 h 30 min |
| August 2 | 81°F | 62°F | 30% | 20% | 14 h 30 min |
| August 3 | 81°F | 62°F | 30% | 20% | 14 h 30 min |
| August 4 | 81°F | 61°F | 30% | 20% | 14 h 20 min |
| August 5 | 81°F | 61°F | 30% | 20% | 14 h 20 min |
| August 6 | 81°F | 61°F | 30% | 20% | 14 h 20 min |
| August 7 | 81°F | 61°F | 30% | 20% | 14 h 20 min |
| August 8 | 81°F | 61°F | 30% | 20% | 14 h 10 min |
| August 9 | 80°F | 61°F | 30% | 20% | 14 h 10 min |
| August 10 | 80°F | 61°F | 29% | 20% | 14 h 10 min |
| August 11 | 80°F | 61°F | 29% | 20% | 14 h 10 min |
| August 12 | 80°F | 61°F | 29% | 20% | 14 h |
| August 13 | 80°F | 61°F | 29% | 20% | 14 h |
| August 14 | 80°F | 61°F | 29% | 20% | 14 h |
| August 15 | 80°F | 60°F | 29% | 20% | 14 h |
| August 16 | 80°F | 60°F | 29% | 20% | 13 h 50 min |
| August 17 | 80°F | 60°F | 29% | 20% | 13 h 50 min |
| August 18 | 80°F | 60°F | 29% | 20% | 13 h 50 min |
| August 19 | 80°F | 60°F | 29% | 20% | 13 h 50 min |
| August 20 | 79°F | 60°F | 29% | 19% | 13 h 40 min |
| August 21 | 79°F | 60°F | 29% | 19% | 13 h 40 min |
| August 22 | 79°F | 59°F | 29% | 19% | 13 h 40 min |
| August 23 | 79°F | 59°F | 29% | 19% | 13 h 40 min |
| August 24 | 79°F | 59°F | 29% | 20% | 13 h 30 min |
| August 25 | 79°F | 59°F | 29% | 20% | 13 h 30 min |
| August 26 | 79°F | 59°F | 29% | 20% | 13 h 30 min |
| August 27 | 78°F | 58°F | 30% | 20% | 13 h 30 min |
| August 28 | 78°F | 58°F | 30% | 20% | 13 h 20 min |
| August 29 | 78°F | 58°F | 29% | 20% | 13 h 20 min |
| August 30 | 78°F | 58°F | 29% | 20% | 13 h 20 min |
| August 31 | 78°F | 57°F | 29% | 20% | 13 h 20 min |
- Normal high
- 80°FAugust average
- Normal low
- 60°FAugust average
- Precipitation
- 3.95 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 14 h 30 min to 13 h 20 minAugust 1 to August 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 16
- 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 August?
On a given August day the chance of 0.01 inch or more is 29% on average, highest around August 1 (30%). In all, 3.95 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Dubuque, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094908.
How humid and windy is Dubuque in August?
At 3 p.m. the normal temperature is 77°F with 58% relative humidity and a dew point of 61°F; at 6 a.m. it is 61°F with 92% humidity. The wind averages 7.5 mph, most often from the south-southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 61°F | 58°F | 92% | 6.2 mph | 68% |
| 9 a.m. | 69°F | 61°F | 75% | 8.9 mph | 71% |
| noon | 75°F | 61°F | 61% | 9.6 mph | 62% |
| 3 p.m. | 77°F | 61°F | 58% | 9.6 mph | 67% |
| 6 p.m. | 73°F | 62°F | 69% | 6.6 mph | 75% |
| 9 p.m. | 66°F | 61°F | 82% | 6.1 mph | 80% |
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 August in Dubuque?
The warmest August temperature on Dubuque's official record (since 1874) is 107°F, on August 18, 1936; the coldest is 40°F, on August 30, 1915. The wettest August brought 9.90 in (1987).
The August mean against the 1991-2020 normal of 69.8°F: 2021 72.3°F (+2.5), 2022 71.0°F (+1.3), 2023 71.3°F (+1.5), 2024 71.4°F (+1.6), 2025 70.3°F (+0.5), 2026 70.7°F (+0.9). 6 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 72.3°F | +2.5°F | 5.53 in |
| 2022 | 71.0°F | +1.3°F | 5.39 in |
| 2023 | 71.3°F | +1.5°F | 4.01 in |
| 2024 | 71.4°F | +1.6°F | 2.73 in |
| 2025 | 70.3°F | +0.5°F | 5.45 in |
| 2026 | 70.7°F | +0.9°F | 1.59 in |
Source: records: ACIS, NWS threaded record DBQthr; recent months: ACIS, station USW00094908. Records and recent months use complete months only.
How does August in Dubuque compare across Iowa?
Across the 132 places PlainClimate covers in Iowa, August normal highs run from 76°F in Northwood to 85°F in Donnellson; Dubuque's is 80°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.