American Falls Reservoir Conditions & Weather

American Falls Reservoir Conditions & Weather | LakeRadar

24-Hour Hourly Weather & Wind Timeline

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Hour-by-hour forecast for American Falls Reservoir, next 24 hours
Metric	3p	4p	5p	6p	7p	8p	9p	10p	11p	12a	1a	2a	3a	4a	5a	6a	7a	8a	9a	10a	11a	12p	1p	2p
Temp (°F)	57°	59°	62°	64°	65°	67°	64°	65°	64°	61°	60°	58°	56°	55°	54°	53°	52°	50°	49°	47°	45°	44°	44°	43°
Wind (kts)	13	15	16	16	16	14	11	8	7	5	4	5	5	5	5	5	7	9	11	11	10	8	8	8
Direction	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	NW	NE	N	S	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW
Gusts (kts)	18	21	24	25	25	23	21	18	15	11	8	9	9	8	8	8	10	12	15	14	13	11	11	11
Precip %	45%	35%	25%	15%	29%	43%	58%	57%	57%	56%	51%	45%	40%	39%	37%	36%	37%	39%	40%	44%	48%	52%	62%	73%

ForecastView official hourly forecast

Hour-by-hour forecast for American Falls Reservoir, next 24 hours
Time	Temp	Wind	Gusts	Precip	Cloud	Condition
Sat, 9 AM MDT	57°F	15 mph SSW (203°)	21 mph	45%	63%	Scattered Rain Showers
Sat, 10 AM MDT	59°F	17 mph SW (225°)	24 mph	35%	57%	Scattered Rain Showers
Sat, 11 AM MDT	62°F	18 mph SW (225°)	28 mph	25%	56%	Scattered Rain Showers
Sat, 12 PM MDT	64°F	18 mph SSW (203°)	29 mph	15%	46%	Isolated Rain Showers
Sat, 1 PM MDT	65°F	18 mph SSW (203°)	29 mph	29%	63%	Scattered Rain Showers
Sat, 2 PM MDT	67°F	16 mph SSW (203°)	27 mph	43%	71%	Scattered Rain Showers
Sat, 3 PM MDT	64°F	13 mph SSW (203°)	24 mph	58%	72%	Chance Showers And Thunderstorms
Sat, 4 PM MDT	65°F	9 mph SSW (203°)	21 mph	57%	71%	Chance Showers And Thunderstorms
Sat, 5 PM MDT	64°F	8 mph SSW (203°)	17 mph	57%	73%	Chance Showers And Thunderstorms
Sat, 6 PM MDT	61°F	6 mph SSW (203°)	13 mph	56%	71%	Chance Showers And Thunderstorms
Sat, 7 PM MDT	60°F	5 mph NW (315°)	9 mph	51%	67%	Scattered Showers And Thunderstorms
Sat, 8 PM MDT	58°F	6 mph NNE (23°)	10 mph	45%	85%	Scattered Showers And Thunderstorms
Sat, 9 PM MDT	56°F	6 mph N (0°)	10 mph	40%	60%	Scattered Rain Showers
Sat, 10 PM MDT	55°F	6 mph S (180°)	9 mph	39%	80%	Scattered Rain Showers
Sat, 11 PM MDT	54°F	6 mph SSW (203°)	9 mph	37%	85%	Scattered Rain Showers
Sun, 12 AM MDT	53°F	6 mph SW (225°)	9 mph	36%	97%	Scattered Rain Showers
Sun, 1 AM MDT	52°F	8 mph SW (225°)	12 mph	37%	98%	Scattered Rain Showers
Sun, 2 AM MDT	50°F	10 mph SW (225°)	14 mph	39%	96%	Scattered Rain Showers
Sun, 3 AM MDT	49°F	13 mph SW (225°)	17 mph	40%	98%	Scattered Rain Showers
Sun, 4 AM MDT	47°F	13 mph SW (225°)	16 mph	44%	97%	Scattered Rain Showers
Sun, 5 AM MDT	45°F	12 mph SW (225°)	15 mph	48%	91%	Scattered Rain Showers
Sun, 6 AM MDT	44°F	9 mph SW (225°)	13 mph	52%	100%	Chance Rain Showers
Sun, 7 AM MDT	44°F	9 mph SW (225°)	13 mph	62%	100%	Rain Showers Likely
Sun, 8 AM MDT	43°F	9 mph SW (225°)	13 mph	73%	100%	Rain Showers Likely
Sun, 9 AM MDT	44°F	6 mph WSW (248°)	9 mph	83%	98%	Rain Showers

Official National Weather Service hourly forecast. Showing 10 of 25 hours. Wind arrows point the way the wind is blowing; the compass point and degrees show where it comes from.

7-Day Weather & Wind Forecast

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Seven-day forecast periods for American Falls Reservoir from the official forecast source
Period	Today October 10, 2026	Tonight October 10, 2026	Sunday October 11, 2026	Sunday Night October 11, 2026	Columbus Day October 12, 2026	Monday Night October 12, 2026	Tuesday October 13, 2026	Tuesday Night October 13, 2026	Wednesday October 14, 2026	Wednesday Night October 14, 2026	Thursday October 15, 2026	Thursday Night October 15, 2026	Friday October 16, 2026	Friday Night October 16, 2026
Temp (°F)	69°	42°	51°	40°	52°	37°	51°	36°	53°	35°	56°	35°	61°	38°
Wind	SSW 8 to 18 mph	WSW 5 to 13 mph	W 3 to 9 mph	WNW 6 to 20 mph	SW 5 to 15 mph	WSW 3 to 7 mph	W 6 to 9 mph	SW 7 to 10 mph	SW 10 mph	SW 7 mph	W 2 to 6 mph	E 3 mph	NE 2 to 6 mph	E 1 to 5 mph
Gusts	29 mph	17 mph	13 mph	24 mph	20 mph	12 mph	15 mph	16 mph	18 mph	14 mph	10 mph	6 mph	12 mph	6 mph
Precip %	58%	56%	97%	99%	63%	60%	55%	47%	28%	12%	3%	1%	0%	0%
Forecast	Chance Showers And Thunderstorms	Chance Showers And Thunderstorms	Rain Showers	Rain Showers	Rain Showers Likely	Rain Showers Likely	Rain Showers Likely	Chance Light Rain	Chance Light Rain then Mostly Sunny	Mostly Clear	Sunny	Mostly Clear	Sunny	Mostly Clear

Forecast periods from official National Weather Service grid. Detailed 7-Day & Hourly Forecast →

Fishing Conditions & Outlook

Solunar windows, water thermocline & species tactics

Score 50 · Poor

Poor for fishing (50/100), from 5 available inputs. Supporting this: Morning hours (09:00 local). Sky is cloudy (63% cloud cover). The forecast mentions thunderstorms, which carries a risk penalty. Not available from a verified source for this lake: pressure trend, water temperature. Confidence is moderate (74%) because some inputs are unavailable or older than ideal.

Prime Solunar Window

6:00 AM MDT – 11:00 AM MDT

Water Layer Temp

Sensor Pending

Surface Chop

9 mph

Barometer Trend

29.73 inHg

Verified Game Fish Species (6):

🐟Smallmouth Bass🐟European Carp🐟Yellow Perch🐟Rainbow Trout

View Full Fishing Forecast & Solunar Times →Fishing methodology →

Boating & Sailing Outlook

Surface chop, sustained knots, gusts & launch facilities

Boating 25Sailing 45

Motorized Boating

Launch Access

Very Poor / Avoid for boating (25/100), from 4 available inputs. Working against it: Active severe alert: Flood Watch. The forecast mentions thunderstorms, which carries a risk penalty. Not available from a verified source for this lake: visibility and conditions, verified water access. Confidence is moderate (84%) because some inputs are unavailable or older than ideal.

Surface state: Moderate Chop (1–2 ft)

Boating Outlook & Ramps Directory →

Sailing & Wind Trim

8 kts (9 mph)

Poor for sailing (45/100), from 4 available inputs. Supporting this: Wind 15 mph from the SSW is in the preferred sailing range. Gusts exceed sustained wind by 6 mph, making the breeze puffy. Working against it: Active severe alert: Flood Watch. The forecast mentions thunderstorms, which carries a risk penalty. Not available from a verified source for this lake: visibility. Confidence is high (88%).

Kayaking, Paddling & Swimming

Paddle drag, thermal comfort & cold water immersion safety

Paddling 28Swimming --

Paddlecraft Readiness

Light Drag

Very Poor / Avoid for kayaking (28/100), from 5 available inputs. Supporting this: Air temperature 57°F. Working against it: Active severe alert: Flood Watch. The forecast mentions thunderstorms, which carries a risk penalty. Confidence is high (90%).

Immersion: Wear USCG Approved Life Jacket

Paddlecraft Guidelines & Launch Points →

Swimming & Immersion

Not monitored

Water temperature is not available from a verified source for this lake. No swimming score is shown without it.

Water Temperature & 30-Day History →

Lake Guide & Verified Facts

Visitor Essentials, Seasonal Guide & Hydrographic Profile

American Falls Reservoir is an important freshwater reservoir in ID, known for its dependable sport fishery, open cruising lanes, and scenic shoreline. Recreational boaters and anglers share its waters alongside migrating waterfowl and native wildlife. Public facilities and natural resource management are overseen by state and local natural resource agencies.

Surface Area

56,000 acres (88 sq mi)

Max Depth

Not documented

Surface Elevation

Not documented

Managing Authority

State & Local Authorities

Classification

Reservoir

State Jurisdiction

Visitor Essentials · Know Before You Go

Fishing Licensing (IDFG)

Valid freshwater sport fishing license issued by Idaho Department of Fish and Game (IDFG) is required for anglers age 14+. Digital license on mobile is accepted.

Boating & AIS Biosecurity Protocol

Mandatory Clean, Drain & Dry inspection. Out-of-area craft require on-site Aquatic Invasive Species (AIS Quagga/Zebra) inspection or decontamination before launch. USCG life jackets required for all.

Public Recreation & Access Pass

Public shoreline and boating access managed by State & Local Authorities. Verify seasonal gate hours, launch fees, and parking rules before travel.

Primary Water Recreation Profile

High-speed motorboating, pontoon cruising, wakeboarding, and water skiing across main channels. Target gamefish include Smallmouth Bass, European Carp, Yellow Perch, Rainbow Trout. Morning hours typically provide optimal glassy conditions for kayak and stand-up paddleboard (SUP) touring.

Seasonal Recreation & Climate Windows

Summer Peak (Jun–Aug)Peak Season

Warm water temperatures, peak swimming, active watersports, and open full-service campgrounds. Highest weekly attendance; plan early arrivals on summer weekends.

Spring & Fall ShoulderPrime Angling

Spring pre-spawn and fall feeding transitions create prime trophy angling conditions. Cooler air, lower boat traffic, and vibrant seasonal shoreline foliage.

Winter Season (Nov–Mar)Off-Season

Northern cold winter conditions with freezing air temperatures and potential surface ice formation. Ramps and water systems may be winterized. Confirm open status before visiting.

Get Directions (GPS) ↗Managing Authority Portal ↗

All geographical facts sourced from official agency recordsView sources →

American Falls Reservoir Conditions

Flood Watch

Quick Conditions

LakeRadar Score

24-Hour Hourly Weather & Wind Timeline

7-Day Weather & Wind Forecast

Water Level & Hydrographic Baseline

Water Temperature (Surface)

Fishing Conditions & Outlook

Boating & Sailing Outlook

Kayaking, Paddling & Swimming

Interactive Map & Navigation Radar

Coordinates and access points

Public Access & Facilities

Boating & Water Regulations

Lake Guide & Verified Facts

Official alerts

Flood Watch

Quick Conditions

LakeRadar Score

24-Hour Hourly Weather & Wind Timeline

7-Day Weather & Wind Forecast

Water Level & Hydrographic Baseline

Water Temperature (Surface)

Fishing Conditions & Outlook

Boating & Sailing Outlook

Kayaking, Paddling & Swimming

Interactive Map & Navigation Radar

Coordinates and access points

Public Access & Facilities

Boating & Water Regulations

Lake Guide & Verified Facts

Related Lakes

Sources and methodology