Iowa weather in August: Statewide normals and every place, NOAA 1991-2020
In August, Iowa's statewide normal high is 82°F and normal low 60°F; normal highs run from 76°F in Northwood to 85°F in Donnellson (NOAA 1991-2020 normals).
- Statewide normal high
- 82°FAugust, 1991-2020
- Statewide normal low
- 60°FAugust, 1991-2020
- Statewide normal precipitation
- 4.13 inAugust
- Warmest place
- 85°Fnormal high, Donnellson
- Coolest place
- 76°Fnormal high, Northwood
Where is Iowa warmest and wettest in August?
Donnellson has the warmest August afternoons (85°F) and Northwood the coolest (76°F). Oskaloosa gets the most precipitation (5.08 in) and Rock Rapids the least (3.12 in).
Statewide, August averaged 72.9°F in 2021, 72.0°F in 2022, 72.5°F in 2023, 71.1°F in 2024, 70.7°F in 2025, 71.9°F in 2026, against a 1991-2020 normal of 71.0°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Des Moines | 84°F | 64°F | 4.17 | 0.0 |
| Cedar Rapids | 81°F | 60°F | 4.07 | – |
| Davenport | 82°F | 62°F | 3.96 | – |
| Sioux City | 83°F | 61°F | 3.94 | 0.0 |
| Ankeny | 84°F | 62°F | 4.72 | 0.0 |
| Iowa City | 84°F | 63°F | 3.94 | – |
| Ames | 82°F | 60°F | 4.85 | – |
| Waterloo | 83°F | 61°F | 4.17 | 0.0 |
| Dubuque | 80°F | 60°F | 3.95 | 0.0 |
| Marion | 83°F | 61°F | 4.42 | 0.0 |
| Marshalltown | 81°F | 60°F | 3.88 | – |
| Mason City | 80°F | 58°F | 3.79 | 0.0 |
| Ottumwa | 84°F | 62°F | 4.44 | 0.0 |
| Fort Dodge | 80°F | 60°F | 4.26 | 0.0 |
| Clinton | 82°F | 63°F | 4.20 | 0.0 |
| Burlington | 84°F | 64°F | 3.77 | – |
| Muscatine | 83°F | 62°F | 4.26 | 0.0 |
| Indianola | 84°F | 62°F | 3.90 | 0.0 |
| Newton | 83°F | 61°F | 4.30 | 0.0 |
| Boone | 82°F | 61°F | 4.92 | 0.0 |
| Storm Lake | 80°F | 61°F | 4.43 | – |
| Oskaloosa | 84°F | 62°F | 5.08 | – |
| Spencer | 82°F | 59°F | 3.29 | – |
| Le Mars | 82°F | 59°F | 3.95 | 0.0 |
| Carroll | 82°F | 61°F | 4.06 | – |
| Fort Madison | 84°F | 66°F | 3.80 | 0.0 |
| Fairfield | 83°F | 61°F | 3.83 | 0.0 |
| Grinnell | 81°F | 59°F | 4.37 | 0.0 |
| Keokuk | 84°F | 65°F | 3.77 | – |
| Sioux Center | 82°F | 60°F | 3.40 | 0.0 |
| Mount Pleasant | 83°F | 60°F | 3.85 | 0.0 |
| Denison | 81°F | 61°F | 4.43 | 0.0 |
| Perry | 83°F | 61°F | 4.14 | – |
| Webster City | 81°F | 58°F | 4.75 | 0.0 |
| Decorah | 83°F | 61°F | 4.39 | 0.0 |
| Knoxville | 83°F | 63°F | 3.89 | – |
| Creston | 83°F | 61°F | 4.23 | – |
| Washington | 83°F | 61°F | 4.18 | 0.0 |
| Charles City | 80°F | 60°F | 4.28 | 0.0 |
| Atlantic | 84°F | 61°F | 4.44 | 0.0 |
| Independence | 81°F | 59°F | 4.27 | 0.0 |
| Maquoketa | 81°F | 61°F | 4.18 | 0.0 |
| Anamosa | 81°F | 59°F | 4.46 | – |
| Estherville | 79°F | 57°F | 3.31 | – |
| Oelwein | 79°F | 60°F | – | – |
| Osceola | 85°F | 61°F | 4.60 | 0.0 |
| Sheldon | 80°F | 58°F | 3.26 | 0.0 |
| Spirit Lake | 80°F | 60°F | 3.69 | 0.0 |
| Winterset | 82°F | 59°F | 3.62 | 0.0 |
| Red Oak | 85°F | 63°F | 3.89 | 0.0 |
| Centerville | 84°F | 61°F | 3.86 | 0.0 |
| Algona | 81°F | 59°F | 4.27 | – |
| Clarinda | 84°F | 62°F | 3.95 | 0.0 |
| Manchester | 80°F | 58°F | 4.13 | 0.0 |
| Glenwood | 85°F | 62°F | 3.81 | 0.0 |
| Cherokee | 82°F | 59°F | 4.12 | 0.0 |
| Iowa Falls | 81°F | 60°F | 4.37 | 0.0 |
| Vinton | 79°F | 58°F | 4.22 | 0.0 |
| Harlan | 84°F | 61°F | 4.32 | 0.0 |
| Shenandoah | 85°F | 64°F | 3.77 | 0.0 |
| Le Claire | 83°F | 64°F | 4.06 | – |
| Humboldt | 79°F | 60°F | 4.55 | – |
| Hampton | 81°F | 59°F | 4.24 | – |
| Chariton | 83°F | 59°F | 4.40 | 0.0 |
| Forest City | 79°F | 59°F | 3.79 | – |
| Jefferson | 81°F | 60°F | 4.21 | 0.0 |
| Cresco | 81°F | 57°F | 4.59 | 0.0 |
| Waukon | 79°F | 59°F | 4.70 | – |
| Emmetsburg | 82°F | 60°F | 4.36 | 0.0 |
| Albia | 83°F | 62°F | 4.04 | 0.0 |
| Osage | 79°F | 59°F | 3.95 | 0.0 |
| New Hampton | 79°F | 58°F | 4.59 | 0.0 |
| Williamsburg | 82°F | 60°F | 4.47 | 0.0 |
| Milford | 80°F | 60°F | 3.47 | 0.0 |
| Tipton | 82°F | 61°F | 3.83 | – |
| Grundy Center | 81°F | 60°F | 4.80 | 0.0 |
| Onawa | 84°F | 59°F | 4.07 | 0.0 |
| Sibley | 80°F | 58°F | 3.58 | 0.0 |
| Bloomfield | 84°F | 64°F | 4.74 | 0.0 |
| Clarion | 82°F | 60°F | 4.10 | 0.0 |
| Rock Rapids | 82°F | 59°F | 3.12 | 0.0 |
| Hawarden | 83°F | 59°F | 3.57 | 0.0 |
| Eldora | 82°F | 59°F | 4.53 | 0.0 |
| Postville | 81°F | 58°F | 4.36 | 0.0 |
| Cascade | 81°F | 60°F | 4.65 | 0.0 |
| Toledo | 81°F | 59°F | 3.99 | 0.0 |
| Belle Plaine | 82°F | 60°F | 4.08 | 0.0 |
| Bellevue | 83°F | 61°F | 3.78 | 0.0 |
| Rockwell City | 81°F | 61°F | 4.53 | 0.0 |
| Lamoni | 84°F | 64°F | 4.38 | – |
| Northwood | 76°F | 57°F | 3.92 | 0.0 |
| Audubon | 81°F | 59°F | 4.51 | – |
| Britt | 80°F | 59°F | 3.57 | – |
| Sac City | 81°F | 59°F | 4.43 | 0.0 |
| Greenfield | 83°F | 62°F | 4.36 | 0.0 |
| Ida Grove | 82°F | 61°F | – | – |
| Sigourney | 83°F | 60°F | 4.76 | – |
| Pocahontas | 82°F | 60°F | 4.34 | 0.0 |
| Guttenberg | 82°F | 62°F | 3.61 | 0.0 |
| Columbus Junction | 82°F | 61°F | 4.22 | 0.0 |
| Leon | 84°F | 61°F | 4.54 | 0.0 |
| Mount Ayr | 83°F | 62°F | 3.98 | 0.0 |
| Guthrie Center | 83°F | 60°F | 4.52 | – |
| Oakland | 83°F | 62°F | 4.87 | 0.0 |
| Corning | 83°F | 61°F | 3.82 | 0.0 |
| Holstein | 79°F | 61°F | 4.24 | 0.0 |
| Bedford | 84°F | 63°F | 4.32 | – |
| Sanborn | 80°F | 60°F | 3.50 | 0.0 |
| Logan | 84°F | 61°F | 4.29 | 0.0 |
| Tripoli | 81°F | 59°F | 4.29 | – |
| Fayette | 80°F | 57°F | 4.13 | 0.0 |
| Elkader | 81°F | 58°F | 3.92 | 0.0 |
| Lake Park | 83°F | 60°F | 3.50 | 0.0 |
| Mapleton | 82°F | 59°F | 3.83 | 0.0 |
| Sidney | 84°F | 63°F | 3.28 | 0.0 |
| Keosauqua | 85°F | 62°F | 3.60 | 0.0 |
| Allison | 80°F | 60°F | 4.04 | – |
| Primghar | 82°F | 62°F | 3.58 | 0.0 |
| Donnellson | 85°F | 63°F | 3.88 | 0.0 |
| Colo | 81°F | 61°F | 4.22 | 0.0 |
| Lowden | 83°F | 60°F | 4.14 | 0.0 |
| Dakota City | 81°F | 60°F | 4.49 | – |
| Sioux Rapids | 79°F | 59°F | 4.41 | 0.0 |
| Coggon | 81°F | 58°F | 4.29 | – |
| Battle Creek | 82°F | 59°F | 4.23 | – |
| Swea City | 78°F | 58°F | 4.11 | 0.0 |
| Allerton | 83°F | 62°F | 4.86 | – |
| Little Sioux | 83°F | 60°F | 4.54 | 0.0 |
| Castana | 82°F | 61°F | 4.23 | 0.0 |
| Stanley | 80°F | 57°F | 3.98 | – |
| Rathbun | 84°F | 64°F | 4.62 | – |
| Beaconsfield | 82°F | 62°F | 4.10 | 0.0 |
| Des Moines Weather Office-Johnston | 83°F | 64°F | 3.97 | 0.0 |
| Sioux City Ang | 83°F | 61°F | 3.93 | – |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.