Idaho weather in May: Statewide normals and every place, NOAA 1991-2020
In May, Idaho's statewide normal high is 63°F and normal low 37°F; normal highs run from 50°F in Mullan to 79°F in Glenns Ferry (NOAA 1991-2020 normals).
- Statewide normal high
- 63°FMay, 1991-2020
- Statewide normal low
- 37°FMay, 1991-2020
- Statewide normal precipitation
- 2.31 inMay
- Warmest place
- 79°Fnormal high, Glenns Ferry
- Coolest place
- 50°Fnormal high, Mullan
Where is Idaho warmest and wettest in May?
Glenns Ferry has the warmest May afternoons (79°F) and Mullan the coolest (50°F). Pierce gets the most precipitation (3.83 in) and Grand View the least (0.90 in). The most snow falls in Winchester (1.6 inches).
Statewide, May averaged 49.8°F in 2021, 46.4°F in 2022, 54.3°F in 2023, 47.0°F in 2024, 52.3°F in 2025, 53.2°F in 2026, against a 1991-2020 normal of 50.1°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Boise | 72°F | 48°F | 1.45 | 0.0 |
| Nampa | 74°F | 44°F | 1.37 | 0.0 |
| Idaho Falls | 67°F | 38°F | 1.57 | – |
| Pocatello | 69°F | 40°F | 1.40 | 0.4 |
| Coeur d'Alene | 66°F | 44°F | 2.14 | – |
| Twin Falls | 69°F | 42°F | 1.46 | – |
| Rexburg | 66°F | 40°F | 1.71 | – |
| Lewiston | 72°F | 48°F | 1.69 | 0.0 |
| Moscow | 67°F | 38°F | 2.60 | 0.2 |
| Mountain Home | 74°F | 45°F | – | – |
| Jerome | 70°F | 44°F | 1.44 | – |
| Blackfoot | 68°F | 43°F | 1.75 | 0.0 |
| Burley | 69°F | 43°F | 1.69 | – |
| Sandpoint | 66°F | 42°F | 2.72 | 0.0 |
| Emmett | 72°F | 44°F | 1.47 | 0.0 |
| Payette | 74°F | 48°F | 1.29 | – |
| Preston | 69°F | 40°F | 2.24 | 0.2 |
| Weiser | 74°F | 47°F | 1.29 | – |
| Rigby | 67°F | 42°F | 1.80 | – |
| American Falls | 71°F | 43°F | 1.54 | – |
| Buhl | 69°F | 45°F | 1.36 | – |
| McCall | 61°F | 36°F | 2.30 | – |
| St. Anthony | 65°F | 39°F | 1.95 | – |
| Grangeville | 64°F | 42°F | 3.44 | 0.2 |
| Ketchum | 62°F | 35°F | 1.78 | 0.2 |
| Salmon | 68°F | 40°F | 1.29 | 0.1 |
| Soda Springs | 66°F | 34°F | 2.32 | – |
| Homedale | 73°F | 47°F | 1.30 | – |
| Bonners Ferry | 69°F | 43°F | 1.78 | 0.0 |
| Bellevue | 67°F | 41°F | 2.07 | – |
| St. Maries | 68°F | 42°F | 2.43 | 0.1 |
| Kellogg | 69°F | 40°F | 2.88 | 0.0 |
| Sugar City | 67°F | 37°F | – | – |
| Fort Hall | 67°F | 39°F | 1.39 | 0.3 |
| Driggs | 65°F | 35°F | 2.30 | – |
| Malad City | 70°F | 39°F | 1.84 | – |
| Parma | 73°F | 46°F | 1.37 | 0.0 |
| Aberdeen | 68°F | 40°F | 1.17 | 0.1 |
| Shoshone | 74°F | 47°F | 1.07 | – |
| Paul | 66°F | 42°F | 1.69 | – |
| Glenns Ferry | 79°F | 46°F | 1.07 | – |
| Kamiah | 73°F | 44°F | 2.79 | 0.0 |
| Plummer | 65°F | 41°F | 2.46 | – |
| Cascade | 63°F | 37°F | 2.13 | 0.4 |
| Hagerman | 72°F | 44°F | 1.03 | – |
| Ashton | 65°F | 40°F | 2.24 | 0.0 |
| Council | 72°F | 42°F | 2.37 | – |
| Grace | 64°F | 38°F | 2.38 | – |
| Challis | 67°F | 40°F | 0.93 | – |
| Cottonwood | 63°F | 42°F | 2.78 | 0.3 |
| Arco | 67°F | 39°F | 1.20 | 0.2 |
| Oakley | 69°F | 42°F | 2.05 | 0.2 |
| Hazelton | 69°F | 42°F | 1.25 | – |
| McCammon | 68°F | 39°F | 2.01 | 0.1 |
| Wallace | 65°F | 41°F | 2.90 | 0.2 |
| Potlatch | 65°F | 40°F | 2.48 | 0.2 |
| Mullan | 50°F | 36°F | 2.96 | – |
| New Meadows | 64°F | 33°F | 2.35 | – |
| Downey | 67°F | 38°F | 2.29 | – |
| Kooskia | 68°F | 43°F | – | – |
| Idaho City | 66°F | 35°F | 2.11 | – |
| Dubois | 67°F | 41°F | 2.04 | 0.5 |
| Pierce | 64°F | 36°F | 3.83 | 0.0 |
| Fairfield | 65°F | 38°F | 1.60 | – |
| Mackay | 65°F | 37°F | 1.23 | – |
| Richfield | 68°F | 39°F | 1.09 | 0.0 |
| Nezperce | 62°F | 39°F | 2.70 | 0.0 |
| Grand View | 76°F | 46°F | 0.90 | – |
| Riggins | 71°F | 41°F | 2.17 | 0.0 |
| Lava Hot Springs | 66°F | 39°F | 2.27 | – |
| Winchester | 60°F | 39°F | 2.76 | 1.6 |
| Cambridge | 72°F | 42°F | 1.81 | – |
| Garden Valley | 69°F | 38°F | 1.79 | 0.0 |
| Swan Valley | 66°F | 35°F | 2.53 | – |
| Tetonia | 60°F | 35°F | 2.30 | – |
| Elk City | 63°F | 33°F | 3.11 | 1.1 |
| Castleford | 70°F | 41°F | 1.43 | – |
| Island Park | 59°F | 32°F | 2.99 | – |
| Malta | 68°F | 37°F | 1.46 | 0.0 |
| Stanley | 60°F | 30°F | 1.49 | – |
| Leadore | 62°F | 32°F | – | – |
| Minidoka | 70°F | 41°F | 1.34 | 0.0 |
| Hamer | 70°F | 37°F | 1.47 | 0.0 |
| Lowman | 68°F | 35°F | – | – |
| Bruneau | 76°F | 48°F | 1.17 | – |
| Arrowrock Dam | 71°F | 44°F | – | – |
| Bayview Model Basin | 64°F | 39°F | 2.33 | 0.0 |
| Bern | 64°F | 34°F | 2.29 | 1.3 |
| Boise Lucky Peak Dam | 74°F | 45°F | 1.87 | – |
| Brownlee Dam | 74°F | 50°F | 1.83 | – |
| Cabinet Gorge | 65°F | 41°F | 2.61 | – |
| Chilly Barton Flat | 63°F | 35°F | 1.20 | 0.4 |
| Craters Of The Moon | 61°F | 33°F | 1.62 | 0.6 |
| Deadwood Lodge | 61°F | 30°F | 3.09 | – |
| Deer Flat Dam | 73°F | 46°F | 1.15 | – |
| Dixie | 57°F | 29°F | – | – |
| Dixie N | 57°F | 29°F | 3.10 | – |
| Dworshak Fish Hatchery | 72°F | 45°F | 2.38 | 0.0 |
| Elk River | 64°F | 38°F | 3.21 | – |
| Fenn Ranger Station | 72°F | 42°F | 3.59 | 0.0 |
| Gibbonsville #2 | 65°F | 36°F | – | – |
| Headquarters | 63°F | 34°F | 3.49 | 0.8 |
| Hill City (1 mi W) | 65°F | 35°F | 1.28 | – |
| Howe | 67°F | 40°F | 1.22 | 0.0 |
| Idaho Falls (46 mi W) | 67°F | 37°F | 1.29 | 0.0 |
| Idaho Falls - Kifi | 67°F | 42°F | 1.93 | – |
| Lifton Pumping Station | 61°F | 38°F | 1.80 | 0.2 |
| Lowell Three Rivers | 72°F | 44°F | 3.31 | – |
| Massacre Rocks State Park | 68°F | 39°F | 1.56 | – |
| May (2 mi SSE) | 68°F | 34°F | 1.22 | – |
| Middle Fork Lodge | 67°F | 38°F | 1.75 | 0.2 |
| Monteview | 67°F | 37°F | 1.20 | – |
| Murphy (10 mi W) | 68°F | 40°F | 1.40 | – |
| Murphy (Desert) Hot Springs | 65°F | 35°F | 2.29 | 0.6 |
| Ola | 72°F | 39°F | 2.18 | – |
| Picabo | 67°F | 34°F | 1.45 | 0.0 |
| Porthill (1 mi SW) | 71°F | 42°F | 2.19 | – |
| Powell | 64°F | 35°F | – | – |
| Prichard (3 mi ESE) | 67°F | 36°F | 3.49 | – |
| Priest River Experiment Station | 68°F | 39°F | 2.76 | 0.0 |
| Red River Ranger Station | 61°F | 33°F | – | – |
| Rexburg BYU Idaho | 66°F | 41°F | 1.81 | – |
| Shoup | 71°F | 42°F | – | – |
| Silver City (5 mi W) | 60°F | 40°F | – | – |
| Small (6 mi N) | 65°F | 38°F | 1.79 | – |
| Swan Falls Powerhouse | 75°F | 50°F | 1.31 | – |
| Taylor Ranch | 68°F | 40°F | 1.84 | 0.2 |
| Twin Falls-KMVT | 73°F | 45°F | 1.22 | – |
| Warren | 59°F | 27°F | – | – |
| Yellowpine | 64°F | 35°F | 1.79 | – |
| Yellowpine Bar | 73°F | 41°F | 2.29 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.