Island Park
One of many meadows in Island Park that reveals the flat bottom of caldera floor. This meadow is near Mesa Falls. The peaks in background are the Grand Tetons.. Image by Originally uploaded by Metrodyne via Wikimedia Commons, Public domain.
Today’s Forecast:
🌤
79°F
Current Temperature
⚠️
Air Quality Alert
Air Quality Alert issued July 27 at 10:23AM MDT by NWS Pocatello ID (Expires: July 28, 2026 4:00 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...BONNEVILLE, BUTTE, CLARK, CUSTER,
FREMONT, JEFFERSON, MADISON, AND TETON 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
Idaho Falls Regional Office at (208)528-2650.
⚠️
Air Quality Alert
Air Quality Alert issued July 27 at 9:00AM MDT by NWS Pocatello ID (Expires: July 28, 2026 2:00 pm)
Show Alert Details & Instructions
Description:
AQAPIH
* WHAT...Air Quality Advisory because of degraded air quality.
Air Quality Index is forecast to be Unhealthy.
* WHERE...CASSIA, LINCOLN, AND MINIDOKA COUNTIES.
* WHEN...THROUGH WEDNESDAY JULY 29TH.
* IMPACTS...Some members of the general public may experience
health effects; members of sensitive groups may experience more
serious health effects.
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
Twin Falls Regional Office at (208)736-2190.
⚠️
Air Quality Alert
Air Quality Alert issued July 27 at 8:52AM 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...FOR 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.
⚠️
Air Quality Alert
Air Quality Alert issued July 27 at 8:42AM MDT by NWS Pocatello ID (Expires: July 28, 2026 4:00 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...BONNEVILLE, BUTTE, CLARK, CUSTER, FREMONT, JEFFERSON,
MADISON, AND TETON 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
Idaho Falls Regional Office at (208)528-2650.
This Afternoon:A slight chance of rain before 3pm, then a slight chance of showers and thunderstorms between 3pm and 4pm. Partly sunny, with a high near 85. South southwest wind around 5 mph. Chance of precipitation is 20%.
Tonight:A slight chance of showers and thunderstorms between 8pm and 9pm, then patchy smoke and a slight chance of rain between 9pm and midnight. Partly cloudy. Low around 52, with temperatures rising to around 54 overnight. East northeast wind around 5 mph. Chance of precipitation is 20%.
Tuesday:Sunny, with a high near 88. South southwest wind 2 to 6 mph.
Today’s Report:
Hiking
Use Caution
44
/100
Use Caution for hiking. High near 84°F. Low rain risk (19%). Slight chance of thunderstorms.
- Temp: Marginal weather factor
- Rain: Favorable conditions
- Wind: Favorable conditions
- Thunderstorm: Marginal weather factor
Tomorrow's Outlook:
Good
76/100
Good for hiking. High near 87°F. Low rain risk (4%). Light wind (6 mph).
Camping
Use Caution
45
/100
Use Caution for camping. High near 84°F. Low rain risk (19%). Slight chance of thunderstorms.
- Temp: Marginal weather factor
- Rain: Favorable conditions
- Wind: Favorable conditions
- Thunderstorm: Marginal weather factor
Tomorrow's Outlook:
Good
82/100
Good for camping. High near 87°F. Low rain risk (4%). Light wind (6 mph).
Paddling
Use Caution
48
/100
Use Caution for paddling. High near 84°F. Low rain risk (19%). Slight chance of thunderstorms.
- Temp: Favorable conditions
- Rain: Favorable conditions
- Wind: Favorable conditions
- Thunderstorm: Marginal weather factor
Tomorrow's Outlook:
Excellent
96/100
Excellent for paddling. High near 87°F. Low rain risk (4%). Light wind (6 mph).
Snowmobiling
Not Recommended
5
/100
Not Recommended for snowmobiling. High near 84°F. Low rain risk (19%). Extreme heat (high near 84°F). Slight chance of thunderstorms. Temperatures outside comfort limits (84°F).
- Temp: Unfavorable weather factor
- Rain: Favorable conditions
- Wind: Favorable conditions
- Heat: Unfavorable weather factor
- Thunderstorm: Marginal weather factor
Tomorrow's Outlook:
Not Recommended
5/100
Not Recommended for snowmobiling. High near 87°F. Low rain risk (4%). Light wind (6 mph). Extreme heat (high near 87°F). Temperatures outside comfort limits (87°F).
About Island Park
Island Park is an Idaho destination for Idaho’s premier snowmobile region and a four-season Yellowstone gateway.
Make the Most of an Island Park 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 Island Park
- 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:
- Big Springs
- Mack’s Inn
- Henrys Lake
- Mesa Falls
- West Yellowstone
Plan Around the Conditions
Choose the safest version of an Island Park day by matching the activity to current wind, precipitation, temperature, smoke, water or snow conditions, access, and daylight.
7-Day Forecast for Island Park, ID
Island Park Weather by Season
Winter
Winter at Island Park 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 35–42°F, using the relevant local and elevation context.
- Annual snowfall: commonly 80–150 inches, with a long snow season.
- 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.