Idaho weather in August: Statewide normals and every place, NOAA 1991-2020
In August, Idaho's statewide normal high is 81°F and normal low 49°F; normal highs run from 69°F in Mullan to 97°F in Glenns Ferry (NOAA 1991-2020 normals).
- Statewide normal high
- 81°FAugust, 1991-2020
- Statewide normal low
- 49°FAugust, 1991-2020
- Statewide normal precipitation
- 0.71 inAugust
- Warmest place
- 97°Fnormal high, Glenns Ferry
- Coolest place
- 69°Fnormal high, Mullan
Where is Idaho warmest and wettest in August?
Glenns Ferry has the warmest August afternoons (97°F) and Mullan the coolest (69°F). Swan Valley gets the most precipitation (1.25 in) and Bruneau the least (0.13 in).
Statewide, August averaged 63.9°F in 2021, 69.4°F in 2022, 65.8°F in 2023, 65.5°F in 2024, 66.6°F in 2025, 68.2°F in 2026, against a 1991-2020 normal of 65.2°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Boise | 91°F | 61°F | 0.17 | 0.0 |
| Nampa | 92°F | 56°F | 0.20 | 0.0 |
| Idaho Falls | 86°F | 48°F | 0.59 | – |
| Pocatello | 88°F | 51°F | 0.53 | 0.0 |
| Coeur d'Alene | 83°F | 56°F | 0.77 | – |
| Twin Falls | 87°F | 56°F | 0.43 | – |
| Rexburg | 84°F | 50°F | 0.75 | – |
| Lewiston | 90°F | 60°F | 0.51 | 0.0 |
| Moscow | 86°F | 45°F | 0.70 | 0.0 |
| Mountain Home | 93°F | 58°F | – | – |
| Jerome | 88°F | 57°F | 0.27 | – |
| Blackfoot | 86°F | 54°F | 0.60 | 0.0 |
| Burley | 87°F | 53°F | 0.40 | – |
| Sandpoint | 82°F | 50°F | 0.80 | 0.0 |
| Emmett | 90°F | 57°F | 0.17 | 0.0 |
| Payette | 90°F | 59°F | 0.24 | – |
| Preston | 87°F | 52°F | 0.81 | 0.0 |
| Weiser | 92°F | 59°F | 0.26 | – |
| Rigby | 84°F | 54°F | 0.78 | – |
| American Falls | 88°F | 55°F | 0.49 | – |
| Buhl | 87°F | 58°F | 0.35 | – |
| McCall | 81°F | 45°F | 0.54 | – |
| St. Anthony | 83°F | 49°F | 0.62 | – |
| Grangeville | 83°F | 53°F | 0.90 | 0.0 |
| Ketchum | 79°F | 44°F | 0.50 | 0.0 |
| Salmon | 85°F | 49°F | 0.60 | 0.0 |
| Soda Springs | 85°F | 44°F | 1.06 | – |
| Homedale | 91°F | 55°F | 0.22 | – |
| Bonners Ferry | 85°F | 52°F | 0.53 | 0.0 |
| Bellevue | 86°F | 53°F | 0.71 | – |
| St. Maries | 85°F | 51°F | 0.74 | 0.0 |
| Kellogg | 84°F | 49°F | 0.82 | 0.0 |
| Sugar City | 84°F | 46°F | – | – |
| Fort Hall | 86°F | 49°F | 0.50 | 0.0 |
| Driggs | 82°F | 46°F | 1.23 | – |
| Malad City | 88°F | 50°F | 0.70 | – |
| Parma | 91°F | 55°F | 0.19 | 0.0 |
| Aberdeen | 87°F | 49°F | 0.42 | 0.0 |
| Shoshone | 92°F | 60°F | 0.30 | – |
| Paul | 84°F | 53°F | 0.37 | – |
| Glenns Ferry | 97°F | 56°F | 0.28 | – |
| Kamiah | 91°F | 52°F | 0.73 | 0.0 |
| Plummer | 83°F | 51°F | 0.74 | – |
| Cascade | 82°F | 47°F | 0.44 | 0.0 |
| Hagerman | 91°F | 53°F | 0.18 | – |
| Ashton | 83°F | 49°F | 0.85 | 0.0 |
| Council | 91°F | 55°F | 0.44 | – |
| Grace | 84°F | 49°F | 1.04 | – |
| Challis | 85°F | 50°F | 0.45 | – |
| Cottonwood | 81°F | 56°F | 0.84 | 0.0 |
| Arco | 85°F | 50°F | 0.54 | 0.0 |
| Oakley | 86°F | 56°F | 0.72 | 0.0 |
| Hazelton | 88°F | 54°F | 0.29 | – |
| McCammon | 86°F | 51°F | 1.04 | 0.0 |
| Wallace | 81°F | 50°F | 1.16 | 0.0 |
| Potlatch | 84°F | 48°F | 0.75 | 0.0 |
| Mullan | 69°F | 51°F | 1.14 | – |
| New Meadows | 85°F | 41°F | 0.56 | – |
| Downey | 88°F | 49°F | 1.01 | – |
| Kooskia | 89°F | 51°F | – | – |
| Idaho City | 86°F | 44°F | 0.44 | – |
| Dubois | 85°F | 53°F | 0.73 | 0.0 |
| Pierce | 83°F | 43°F | 1.01 | 0.0 |
| Fairfield | 83°F | 48°F | 0.35 | – |
| Mackay | 82°F | 48°F | 0.68 | – |
| Richfield | 88°F | 52°F | 0.29 | 0.0 |
| Nezperce | 81°F | 48°F | 0.78 | 0.0 |
| Grand View | 92°F | 55°F | 0.20 | – |
| Riggins | 90°F | 52°F | 0.73 | 0.0 |
| Lava Hot Springs | 86°F | 49°F | 1.05 | – |
| Winchester | 79°F | 49°F | 0.71 | 0.0 |
| Cambridge | 92°F | 54°F | 0.32 | – |
| Garden Valley | 89°F | 46°F | 0.46 | 0.0 |
| Swan Valley | 84°F | 44°F | 1.25 | – |
| Tetonia | 78°F | 45°F | 1.19 | – |
| Elk City | 83°F | 39°F | 1.09 | 0.0 |
| Castleford | 86°F | 52°F | 0.34 | – |
| Island Park | 77°F | 40°F | 1.14 | – |
| Malta | 87°F | 48°F | 0.92 | 0.0 |
| Stanley | 80°F | 37°F | 0.48 | – |
| Leadore | 81°F | 40°F | – | – |
| Minidoka | 88°F | 52°F | 0.33 | 0.0 |
| Hamer | 87°F | 47°F | 0.51 | 0.0 |
| Lowman | 86°F | 42°F | – | – |
| Bruneau | 94°F | 58°F | 0.13 | – |
| Arrowrock Dam | 91°F | 57°F | – | – |
| Bayview Model Basin | 80°F | 49°F | 0.92 | 0.0 |
| Bern | 84°F | 45°F | 0.96 | 0.0 |
| Boise Lucky Peak Dam | 91°F | 58°F | 0.28 | – |
| Brownlee Dam | 94°F | 63°F | 0.23 | – |
| Cabinet Gorge | 81°F | 51°F | 0.76 | – |
| Chilly Barton Flat | 80°F | 45°F | 0.66 | 0.0 |
| Craters Of The Moon | 80°F | 47°F | 0.65 | 0.0 |
| Deadwood Lodge | 81°F | 39°F | 0.56 | – |
| Deer Flat Dam | 89°F | 57°F | 0.19 | – |
| Dixie | 77°F | 36°F | – | – |
| Dixie N | 76°F | 36°F | 0.88 | – |
| Dworshak Fish Hatchery | 90°F | 54°F | 0.68 | 0.0 |
| Elk River | 83°F | 48°F | 0.86 | – |
| Fenn Ranger Station | 90°F | 52°F | 0.86 | 0.0 |
| Gibbonsville #2 | 83°F | 44°F | – | – |
| Headquarters | 80°F | 42°F | 1.03 | 0.0 |
| Hill City (1 mi W) | 85°F | 45°F | 0.24 | – |
| Howe | 86°F | 49°F | 0.43 | 0.0 |
| Idaho Falls (46 mi W) | 87°F | 48°F | 0.44 | 0.0 |
| Idaho Falls - Kifi | 86°F | 54°F | 0.65 | – |
| Lifton Pumping Station | 80°F | 48°F | 0.76 | 0.0 |
| Lowell Three Rivers | 92°F | 54°F | 0.88 | – |
| Massacre Rocks State Park | 88°F | 52°F | 0.58 | – |
| May (2 mi SSE) | 85°F | 42°F | 0.88 | – |
| Middle Fork Lodge | 85°F | 46°F | 0.68 | 0.0 |
| Monteview | 85°F | 46°F | 0.80 | – |
| Murphy (10 mi W) | 86°F | 53°F | 0.30 | – |
| Murphy (Desert) Hot Springs | 85°F | 45°F | 0.54 | 0.0 |
| Ola | 91°F | 48°F | 0.34 | – |
| Picabo | 86°F | 45°F | 0.23 | 0.0 |
| Porthill (1 mi SW) | 86°F | 50°F | 0.82 | – |
| Powell | 82°F | 44°F | – | – |
| Prichard (3 mi ESE) | 84°F | 43°F | 1.17 | – |
| Priest River Experiment Station | 83°F | 46°F | 0.87 | 0.0 |
| Red River Ranger Station | 80°F | 39°F | – | – |
| Rexburg BYU Idaho | 84°F | 50°F | 0.70 | – |
| Shoup | 89°F | 52°F | – | – |
| Silver City (5 mi W) | 81°F | 57°F | – | – |
| Small (6 mi N) | 82°F | 49°F | 0.78 | – |
| Swan Falls Powerhouse | 93°F | 63°F | 0.19 | – |
| Taylor Ranch | 87°F | 50°F | 0.69 | 0.0 |
| Twin Falls-KMVT | 91°F | 56°F | 0.34 | – |
| Warren | 79°F | 35°F | – | – |
| Yellowpine | 87°F | 45°F | 0.71 | – |
| Yellowpine Bar | 91°F | 52°F | 0.80 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.