Iowa City weather in August: Iowa City, Iowa: normal highs, lows, rain and records for August
Iowa City in August has a normal high of 84°F and a normal low of 63°F, a daily mean of 74°F, falling from 85°F on the 1st to 82°F by the 31st. Measurable precipitation falls on 10 days in a normal August, 3.94 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 17°C, 100 mm of precipitation in August.
- NOAA stationIowa City Municipal Airport
- Station IDUSW00014937
- Location41.63°N 91.54°W
- Elevation650 ft (198 m)
- From the center2 miles
- Population76,710
- Jan 31° 15°
- Feb 36° 19°
- Mar 50° 30°
- Apr 63° 40°
- May 73° 52°
- Jun 83° 62°
- Jul 86° 66°
- Aug 84° 63°
- Sep 78° 54°
- Oct 64° 42°
- Nov 49° 30°
- Dec 36° 20°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Iowa City in August?
The normal high is 84°F and the normal low 63°F, for a daily mean of 73.5°F. August is 2.3°F cooler than July and 7.7°F warmer than September. August is the 2nd warmest month of the year in Iowa City and the 3rd wettest. Across the month the normal high falls 3°F, from 85°F on August 1 to 82°F on August 31. From one year to the next August's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 71°F and 76°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 85°F | 66°F | 32% | 19% |
| August 8 | 85°F | 65°F | 33% | 19% |
| August 15 | 84°F | 64°F | 33% | 20% |
| August 22 | 83°F | 62°F | 33% | 19% |
| August 31 | 82°F | 60°F | 33% | 19% |
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 | 85°F | 66°F | 32% | 19% | 14 h 30 min |
| August 2 | 85°F | 66°F | 32% | 19% | 14 h 20 min |
| August 3 | 85°F | 65°F | 32% | 19% | 14 h 20 min |
| August 4 | 85°F | 65°F | 33% | 19% | 14 h 20 min |
| August 5 | 85°F | 65°F | 33% | 19% | 14 h 20 min |
| August 6 | 85°F | 65°F | 33% | 19% | 14 h 20 min |
| August 7 | 85°F | 65°F | 33% | 19% | 14 h 10 min |
| August 8 | 85°F | 65°F | 33% | 19% | 14 h 10 min |
| August 9 | 85°F | 65°F | 33% | 19% | 14 h 10 min |
| August 10 | 85°F | 65°F | 33% | 19% | 14 h 10 min |
| August 11 | 85°F | 65°F | 33% | 20% | 14 h |
| August 12 | 84°F | 64°F | 33% | 20% | 14 h |
| August 13 | 84°F | 64°F | 33% | 20% | 14 h |
| August 14 | 84°F | 64°F | 33% | 20% | 14 h |
| August 15 | 84°F | 64°F | 33% | 20% | 13 h 50 min |
| August 16 | 84°F | 64°F | 33% | 20% | 13 h 50 min |
| August 17 | 84°F | 63°F | 33% | 20% | 13 h 50 min |
| August 18 | 84°F | 63°F | 33% | 20% | 13 h 50 min |
| August 19 | 84°F | 63°F | 33% | 20% | 13 h 40 min |
| August 20 | 83°F | 63°F | 33% | 19% | 13 h 40 min |
| August 21 | 83°F | 63°F | 33% | 19% | 13 h 40 min |
| August 22 | 83°F | 62°F | 33% | 19% | 13 h 40 min |
| August 23 | 83°F | 62°F | 33% | 19% | 13 h 30 min |
| August 24 | 83°F | 62°F | 33% | 19% | 13 h 30 min |
| August 25 | 83°F | 62°F | 33% | 19% | 13 h 30 min |
| August 26 | 83°F | 61°F | 33% | 19% | 13 h 30 min |
| August 27 | 83°F | 61°F | 33% | 19% | 13 h 20 min |
| August 28 | 82°F | 61°F | 33% | 19% | 13 h 20 min |
| August 29 | 82°F | 61°F | 33% | 19% | 13 h 20 min |
| August 30 | 82°F | 60°F | 33% | 19% | 13 h 20 min |
| August 31 | 82°F | 60°F | 33% | 19% | 13 h 10 min |
- Normal high
- 84°FAugust average
- Normal low
- 63°FAugust average
- Precipitation
- 3.94 inmonth total
- Days with precipitation
- 100.01 inch or more
- Days at 90°F or more
- 4
- Daylight
- 14 h 30 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 30
- Days at 80°F or more
- 23
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00014937; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Iowa City in August?
On a given August day the chance of 0.01 inch or more is 33% on average, highest around August 10 (33%). In all, 3.94 in falls on 10 days of a normal August, 1 of them with an inch or more.
In a normal August in Iowa City, 4 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00014937.
What are the records for August in Iowa City?
The warmest August temperature on this station's record (since 1948) is 101°F, on August 20, 2003; the coldest is 40°F, on August 20, 1950. The wettest August brought 8.36 in (2018).
The August mean against the 1991-2020 normal of 73.5°F: 2021 75.4°F (+1.9), 2022 74.3°F (+0.8), 2023 74.5°F (+1.0), 2024 73.5°F (at normal), 2025 72.9°F (−0.6), 2026 74.5°F (+1.0). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.4°F | +1.9°F | 2.61 in |
| 2022 | 74.3°F | +0.8°F | 2.00 in |
| 2023 | 74.5°F | +1.0°F | 2.11 in |
| 2024 | 73.5°F | at normal | 4.29 in |
| 2025 | 72.9°F | −0.6°F | 1.64 in |
| 2026 | 74.5°F | +1.0°F | 3.81 in |
Source: records: ACIS, station USW00014937; recent months: ACIS, station USW00014937. Records and recent months use complete months only.
How does August in Iowa City 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; Iowa City's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.