Iowa weather in May: Statewide normals and every place, NOAA 1991-2020
In May, Iowa's statewide normal high is 71°F and normal low 49°F; normal highs run from 66°F in Northwood to 74°F in Glenwood (NOAA 1991-2020 normals).
- Statewide normal high
- 71°FMay, 1991-2020
- Statewide normal low
- 49°FMay, 1991-2020
- Statewide normal precipitation
- 4.84 inMay
- Warmest place
- 74°Fnormal high, Glenwood
- Coolest place
- 66°Fnormal high, Northwood
Where is Iowa warmest and wettest in May?
Glenwood has the warmest May afternoons (74°F) and Northwood the coolest (66°F). Shenandoah gets the most precipitation (6.16 in) and Spencer the least (3.83 in).
Statewide, May averaged 59.0°F in 2021, 61.3°F in 2022, 62.7°F in 2023, 62.0°F in 2024, 59.6°F in 2025, 60.7°F in 2026, against a 1991-2020 normal of 59.9°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Des Moines | 72°F | 52°F | 5.24 | 0.2 |
| Cedar Rapids | 71°F | 50°F | 4.25 | – |
| Davenport | 73°F | 51°F | 4.82 | – |
| Sioux City | 72°F | 49°F | 3.87 | 0.0 |
| Ankeny | 72°F | 50°F | 5.26 | 0.0 |
| Iowa City | 73°F | 52°F | 4.48 | – |
| Ames | 72°F | 50°F | 5.16 | – |
| Waterloo | 73°F | 50°F | 4.61 | 0.1 |
| Dubuque | 69°F | 49°F | 4.30 | 0.0 |
| Marion | 74°F | 50°F | 4.74 | 0.0 |
| Marshalltown | 71°F | 49°F | 4.88 | – |
| Mason City | 70°F | 47°F | 5.15 | 0.3 |
| Ottumwa | 73°F | 51°F | 5.03 | 0.0 |
| Fort Dodge | 70°F | 48°F | 4.57 | 0.4 |
| Clinton | 73°F | 51°F | 4.39 | 0.0 |
| Burlington | 73°F | 53°F | 4.93 | – |
| Muscatine | 74°F | 51°F | 5.11 | 0.0 |
| Indianola | 72°F | 50°F | 5.58 | 0.3 |
| Newton | 71°F | 50°F | 4.84 | 0.0 |
| Boone | 71°F | 49°F | 5.17 | 0.0 |
| Storm Lake | 69°F | 49°F | 4.87 | – |
| Oskaloosa | 72°F | 51°F | 4.71 | – |
| Spencer | 71°F | 48°F | 3.83 | – |
| Le Mars | 72°F | 47°F | 3.90 | 0.1 |
| Carroll | 71°F | 49°F | 4.49 | – |
| Fort Madison | 72°F | 54°F | 5.11 | 0.0 |
| Fairfield | 71°F | 50°F | 5.51 | 0.0 |
| Grinnell | 70°F | 47°F | 5.09 | 0.0 |
| Keokuk | 73°F | 53°F | 5.26 | – |
| Sioux Center | 73°F | 48°F | 4.15 | 0.1 |
| Mount Pleasant | 72°F | 49°F | 5.05 | 0.0 |
| Denison | 70°F | 49°F | 4.62 | 0.1 |
| Perry | 72°F | 49°F | 5.15 | – |
| Webster City | 70°F | 47°F | 5.27 | 0.2 |
| Decorah | 73°F | 48°F | 4.94 | 0.0 |
| Knoxville | 71°F | 51°F | 4.98 | – |
| Creston | 71°F | 49°F | 5.15 | – |
| Washington | 72°F | 50°F | 5.11 | 0.0 |
| Charles City | 70°F | 49°F | 5.06 | 0.3 |
| Atlantic | 73°F | 49°F | 5.43 | 0.0 |
| Independence | 71°F | 48°F | 4.60 | 0.0 |
| Maquoketa | 70°F | 49°F | 4.21 | 0.1 |
| Anamosa | 70°F | 47°F | 4.80 | – |
| Estherville | 69°F | 46°F | 4.50 | – |
| Oelwein | 69°F | 48°F | – | – |
| Osceola | 72°F | 49°F | 5.50 | 0.2 |
| Sheldon | 69°F | 46°F | 4.03 | 0.2 |
| Spirit Lake | 68°F | 48°F | 4.13 | 0.1 |
| Winterset | 71°F | 48°F | 4.99 | 0.1 |
| Red Oak | 73°F | 51°F | 5.95 | 0.0 |
| Centerville | 72°F | 48°F | 5.22 | 0.0 |
| Algona | 71°F | 47°F | 4.72 | – |
| Clarinda | 73°F | 50°F | 5.60 | 0.0 |
| Manchester | 70°F | 47°F | 4.49 | 0.0 |
| Glenwood | 74°F | 50°F | 5.19 | 0.0 |
| Cherokee | 71°F | 47°F | 4.28 | 0.1 |
| Iowa Falls | 70°F | 48°F | 5.57 | 0.0 |
| Vinton | 69°F | 47°F | 5.01 | 0.0 |
| Harlan | 74°F | 49°F | 4.74 | 0.0 |
| Shenandoah | 74°F | 53°F | 6.16 | 0.0 |
| Le Claire | 72°F | 52°F | 4.81 | – |
| Humboldt | 68°F | 49°F | 4.80 | – |
| Hampton | 70°F | 48°F | 5.25 | – |
| Chariton | 71°F | 47°F | 5.39 | 0.0 |
| Forest City | 69°F | 47°F | 4.83 | – |
| Jefferson | 71°F | 49°F | 4.97 | 0.0 |
| Cresco | 69°F | 45°F | 4.47 | 0.2 |
| Waukon | 68°F | 46°F | 4.66 | – |
| Emmetsburg | 71°F | 49°F | 4.49 | 0.1 |
| Albia | 71°F | 51°F | 4.86 | 0.0 |
| Osage | 68°F | 47°F | 5.19 | 0.4 |
| New Hampton | 68°F | 47°F | 4.95 | 0.0 |
| Williamsburg | 71°F | 49°F | 4.85 | 0.1 |
| Milford | 70°F | 48°F | 4.21 | 0.1 |
| Tipton | 72°F | 51°F | 4.74 | – |
| Grundy Center | 70°F | 48°F | 4.89 | 0.0 |
| Onawa | 74°F | 48°F | 4.58 | 0.0 |
| Sibley | 69°F | 46°F | 4.06 | 0.0 |
| Bloomfield | 72°F | 52°F | 5.51 | 0.0 |
| Clarion | 72°F | 48°F | 4.81 | 0.0 |
| Rock Rapids | 70°F | 47°F | 3.96 | 0.1 |
| Hawarden | 71°F | 47°F | 4.04 | 0.2 |
| Eldora | 70°F | 48°F | 5.21 | 0.4 |
| Postville | 69°F | 47°F | 4.99 | 0.0 |
| Cascade | 70°F | 49°F | 4.21 | 0.0 |
| Toledo | 70°F | 48°F | 4.80 | 0.2 |
| Belle Plaine | 71°F | 49°F | 4.43 | 0.0 |
| Bellevue | 71°F | 48°F | 4.21 | 0.1 |
| Rockwell City | 70°F | 49°F | 5.02 | 0.0 |
| Lamoni | 72°F | 53°F | 5.14 | – |
| Northwood | 66°F | 45°F | 4.78 | 0.0 |
| Audubon | 70°F | 48°F | 5.18 | – |
| Britt | 69°F | 48°F | 4.48 | – |
| Sac City | 70°F | 47°F | 4.59 | 0.0 |
| Greenfield | 71°F | 50°F | 5.31 | 0.1 |
| Ida Grove | 70°F | 49°F | – | – |
| Sigourney | 71°F | 49°F | 4.95 | – |
| Pocahontas | 71°F | 49°F | 4.57 | 0.0 |
| Guttenberg | 71°F | 50°F | 4.58 | 0.0 |
| Columbus Junction | 72°F | 50°F | 5.41 | 0.0 |
| Leon | 72°F | 48°F | 5.54 | 0.0 |
| Mount Ayr | 71°F | 50°F | 5.35 | 0.0 |
| Guthrie Center | 72°F | 48°F | 5.30 | – |
| Oakland | 72°F | 50°F | 5.42 | 0.1 |
| Corning | 71°F | 49°F | 5.15 | 0.0 |
| Holstein | 70°F | 49°F | 4.50 | 0.2 |
| Bedford | 72°F | 51°F | 5.27 | – |
| Sanborn | 69°F | 47°F | 4.49 | 0.1 |
| Logan | 73°F | 49°F | 4.95 | 0.0 |
| Tripoli | 70°F | 48°F | 5.11 | – |
| Fayette | 69°F | 45°F | 5.05 | 0.0 |
| Elkader | 70°F | 46°F | 4.65 | 0.0 |
| Lake Park | 70°F | 47°F | 4.59 | 0.0 |
| Mapleton | 71°F | 47°F | 4.78 | 0.1 |
| Sidney | 73°F | 51°F | 5.26 | 0.0 |
| Keosauqua | 73°F | 51°F | 5.67 | 0.0 |
| Allison | 70°F | 49°F | 5.13 | – |
| Primghar | 72°F | 49°F | 4.11 | 0.0 |
| Donnellson | 73°F | 52°F | 5.01 | 0.0 |
| Colo | 70°F | 49°F | 4.81 | 0.0 |
| Lowden | 73°F | 50°F | 4.48 | 0.0 |
| Dakota City | 70°F | 48°F | 5.12 | – |
| Sioux Rapids | 70°F | 48°F | 4.19 | 0.3 |
| Coggon | 70°F | 46°F | 4.78 | – |
| Battle Creek | 71°F | 48°F | 4.40 | – |
| Swea City | 68°F | 46°F | 4.60 | 0.0 |
| Allerton | 71°F | 50°F | 5.65 | – |
| Little Sioux | 73°F | 48°F | 5.06 | 0.3 |
| Castana | 71°F | 49°F | 4.66 | 0.0 |
| Stanley | 70°F | 46°F | 4.84 | – |
| Rathbun | 71°F | 51°F | 5.36 | – |
| Beaconsfield | 70°F | 50°F | 5.27 | 0.0 |
| Des Moines Weather Office-Johnston | 72°F | 52°F | 4.84 | 0.2 |
| Sioux City Ang | 72°F | 47°F | 4.44 | – |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.