American Falls Reservoir

Home / Locations / Idaho / American Falls Reservoir
American Falls Reservoir
American Falls Reservoir. Image by JF Hobbs via Wikimedia Commons, CC BY 3.0.

Today’s Forecast:

🌧
73°F
Current Temperature
Light Rain and Smoke
Station: KPIH
Observed at: 5:45 pm
Wind: 10 mph | Humidity: 41%
⚠️
Air Quality Alert
Air Quality Alert issued July 27 at 10:28AM MDT by NWS Pocatello ID (Expires: July 28, 2026 12:00 pm)
Show Alert Details & Instructions
Description: AQAPIH * WHAT...Air Quality Advisory because of degraded air quality. Air Quality Index is forecast to be Unhealthy for Sensitive Groups. * WHERE...POWER, BANNOCK AND BINGHAM COUNTIES. * WHEN...THROUGH WEDNESDAY JULY 29TH. * IMPACTS...Members of sensitive groups may experience health effects. The general public is less likely to be affected. Instructions: Air pollutants can cause breathing difficulties for children, the elderly, as well as persons with respiratory problems. Those individuals who are sensitive to increased particulate matter or smoke are encouraged to avoid prolonged or strenuous outdoor activity during this advisory. Open burning is prohibited by air quality rule. It is also recommended that all other individuals limit prolonged or strenuous activity outdoors. THIS STATEMENT IS ISSUED BY THE IDAHO DEPARTMENT OF ENVIRONMENTAL QUALITY, AIR QUALITY GROUP. FOR MORE INFORMATION, CONTACT DEQ's Pocatello Regional Office at (208)236-6160.
This Afternoon:Smoke before 5pm. Partly sunny. High near 97, with temperatures falling to around 94 in the afternoon. West wind around 7 mph.
Tonight:A slight chance of rain before 7pm, then areas of smoke. Partly cloudy. Low around 62, with temperatures rising to around 64 overnight. South wind around 7 mph. Chance of precipitation is 20%.
Tuesday:Smoke before 4pm, then smoke and a slight chance of showers and thunderstorms. Sunny. High near 98, with temperatures falling to around 94 in the afternoon. West southwest wind 3 to 8 mph. Chance of precipitation is 20%.

Today’s Report:

⛵ Boating

Use Caution
  45 /100

Use Caution for boating. High near 95°F. Low rain risk (16%). Light wind (7 mph). Hot temperatures (high near 95°F). Smoke or haze in forecast.

  • Temp: Marginal weather factor
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Heat: Marginal weather factor
  • Smoke: Marginal weather factor
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 13/100
Not Recommended for boating. High near 96°F. Low rain risk (20%). Light wind (8 mph). Hot temperatures (high near 96°F). Smoke or haze in forecast. Slight chance of thunderstorms. Temperatures outside comfort limits (96°F).

🛶 Paddling

Use Caution
  45 /100

Use Caution for paddling. High near 95°F. Low rain risk (16%). Light wind (7 mph). Hot temperatures (high near 95°F). Smoke or haze in forecast.

  • Temp: Marginal weather factor
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Heat: Marginal weather factor
  • Smoke: Marginal weather factor
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 13/100
Not Recommended for paddling. High near 96°F. Risk of rain (20%). Light wind (8 mph). Hot temperatures (high near 96°F). Smoke or haze in forecast. Slight chance of thunderstorms. Temperatures outside comfort limits (96°F).

⛺ Camping

Use Caution
  43 /100

Use Caution for camping. High near 95°F. Low rain risk (16%). Light wind (7 mph). Hot temperatures (high near 95°F). Smoke or haze in forecast.

  • Temp: Marginal weather factor
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Heat: Marginal weather factor
  • Smoke: Marginal weather factor
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 12/100
Not Recommended for camping. High near 96°F. Low rain risk (20%). Light wind (8 mph). Hot temperatures (high near 96°F). Smoke or haze in forecast. Slight chance of thunderstorms. Temperatures outside comfort limits (96°F).

About American Falls Reservoir

American Falls Reservoir is an Idaho destination for a large reservoir with boating, camping, and locally established ice fishing.

Make the Most of an American Falls Reservoir Day

Match the route, launch, facility, or turnaround time to wind, precipitation, temperature, smoke, water, snow, road access, and daylight. Keep a shorter or more sheltered backup ready.

Weather Tips for American Falls Reservoir

  • Check official access notices, alerts, road or trail conditions, fire restrictions, and local forecasts before leaving.
  • Check river flow, reservoir wind, cold-water conditions, waves, lightning, and verified local ice reports before water plans; no forecast alone proves that ice is safe.
  • Carry layers, water, navigation, sun protection, and seasonal traction or flotation appropriate to the activity.
  • Allow extra time for remote roads, mountain passes, wildfire smoke, spring runoff, and limited winter daylight.

Nearby Towns and Areas

This page can also be useful when planning outdoor time near:

  • American Falls
  • Massacre Rocks State Park
  • Pocatello
  • Sportsman’s Park
  • Snake River

Plan Around the Conditions

Choose the safest version of an American Falls Reservoir day by matching the activity to current wind, precipitation, temperature, smoke, water or snow conditions, access, and daylight.

7-Day Forecast for American Falls Reservoir, ID

🌧
73°F
Current Temperature
Light Rain and Smoke
Station: KPIH
Observed at: 5:45 pm
Wind: 10 mph | Humidity: 41%
Mon 🌫
97° 62°
11%
Tue 🌫
98° 62°
20%
Wed 🌫
96° 60°
23%
Thu ☀
99° 62°
0%
Fri ☀
102° 64°
0%
Sat ☀
104° 65°
0%
Sun ☀
98° 60°
0%

7-Day High Temperature Trend

97° Mon 98° Tue 96° Wed 99° Thu 102° Fri 104° Sat 98° Sun

7-Day Low Temperature Trend

62° Mon 62° Tue 60° Wed 62° Thu 64° Fri 65° Sat 60° Sun

📊 7-Day Outdoor Outlook

Good Fair Poor 12 Mon 12 Tue 12 Wed 12 Thu 12 Fri 6 Sat 12 Sun
Forecast data from the National Weather Service  |  Last Updated: July 27, 2026 6:01 pm CDT

American Falls Reservoir Weather by Season

Winter

Winter at American Falls Reservoir can bring snow, ice, wind, short daylight, and rapidly changing road or trail access. Confirm grooming, avalanche information, ice conditions, and facility operations for the listed winter activities.

Spring

Spring brings freeze-thaw mud, snowmelt, high rivers, cold water, and lingering mountain snow. Lower routes usually open well before high passes and backcountry trailheads.

Summer

Summer usually offers the broadest access, but dry heat, thunderstorms, lightning, wildfire smoke, fire restrictions, reservoir wind, and cold mountain water can alter plans.

Fall

Fall brings cooler air, shorter daylight, hunting-season awareness, and early snow at elevation. Confirm seasonal services and allow extra travel time on remote roads.

Key Climate Data Points

  • Annual average temperature: around 48–52°F, using the relevant local and elevation context.
  • Annual snowfall: usually 10–25 inches, with wind and freeze-thaw variation.
  • Warmest months: July and August are normally warmest.
  • Coolest months: December and January are typically coolest.
  • Wettest season: winter and spring usually provide the greatest mountain precipitation, with local variation.
  • Driest season: midsummer is generally driest, despite isolated thunderstorms.
  • Best outdoor window: June through October for warm-season access, with midwinter best at established winter destinations.