Marine Weather and Tide Forecast for Boise City, ID
 | Sunrise 7:48 AM Sunset 6:09 PM Moonrise 4:06 AM Moonset 12:19 PM |
Marine Forecasts
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7 Day Forecast for Marine Location Near Boise City, ID
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FXUS65 KBOI 120357 AFDBOI
Area Forecast Discussion National Weather Service Boise ID 857 PM MST Wed Feb 11 2026
DISCUSSION
Showers have ended across the area this evening as the initial moisture plume shifts north. The combination of clearing skies aloft, moist low levels, and light winds will set the stage for widespread stratus and fog development across the lower valleys tonight. Recent satellite imagery already shows stratus expanding across the Upper Treasure and Western Magic Valleys, as well as the Burns Basin. Expect this deck to expand overnight into the Lower Treasure Valley and Upper Weiser Basin.
Fog is more likely in Long Valley later tonight where skies will remain completely clear, allowing for more efficient radiational cooling.
On Thursday, the upper level low will linger near the California and Nevada border. While much of the day will see partial clearing and stable conditions, cool air aloft and lingering moisture will provide enough instability for isolated showers in the afternoon. These will be most prevalent over the higher terrain of the Boise Mountains and the south central Idaho highlands. Partial clearing of the stratus is possible Thursday afternoon across the Treasure Valley, but clouds are likely to persist (40% chance) from Mountain Home eastward through the Western Magic Valley. Temperatures will remain near or slightly above seasonal normals, with highs in the 40s for most valley locations, though areas that remain trapped under the stratus and fog will see limited warming.
AVIATION
Areas of MVFR-IFR in low stratus. IFR-VLIFR in patchy fog/mist developing overnight. Mtn obscuration.
Improvement of fog late Thu morning, but stratus lingering into Thu afternoon. A 20% chance of rain/mixed showers across SW Idaho mtns and SE Oregon Thursday PM. Surface winds: variable up to 10 kt. Winds aloft at 10kft MSL: W to NW 5-15 kt.
KBOI.. MVFR-IFR in low stratus and mist overnight. Stratus ceilings lifting late Thu morning, then eroding Thu afternoon.
Surface winds: light and variable.
PREV DISCUSSION
SHORT TERM
Tonight through Friday night
Showers dry up this evening with a slight chance lingering over higher terrain along the ID/NV border into Thursday. Increased moisture near the surface will lead to fog and low-cloud development across SE Oregon and areas of SW Idaho. Leaning toward low-clouds being the dominant feature in the lower Snake Plain with greater fog coverage across SE Oregon and higher terrain of SW ID (to include the western Magic Valley) where clouds will be more likely to intersect the terrain. In these areas have gone with dense fog wording but not enough coverage to warrant products.
Thursday is mostly dry with fog/stratus breaking by early afternoon. With the upper trough axis overhead, or just to the east, we could see afternoon 'popcorn' showers over the mtns of SE Oregon and w-central ID and have a slight chance (15%) to cover the potential. Another round of fog/stratus Thursday night as a flat ridge works in aloft. Clouds will increase on Friday as another trough approaches the West Coast and southwest flow increases moisture aloft. Temperatures through the period will be at or slightly above normal.
LONG TERM
Saturday through Wednesday
The long term continues to look wet and unsettled, with more cooling than previous forecasts as well. A deep longwave trough will remain positioned along the west coast as subsequent lows from the Gulf of Alaska keep it stalled and energetic through Wednesday. The forecast Saturday and Sunday calls for increasing clouds, with a 20-30% chance of precipitation. More widespread precipitation is expected north and west of the area, and will move in later in the long term. Over the weekend the wetter flow is kept out of the area by strong southwest flow aloft, which will keep temperatures about 5 degrees above normal. The low amplifies Monday and Tuesday and we move into the more favorable moisture band. Precipitation chances increase to 40-80% Monday evening through Tuesday, highest in mountains. Temps cool down to a few degrees below normal by Wednesday, and unsettled conditions continue.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
Area Forecast Discussion National Weather Service Boise ID 857 PM MST Wed Feb 11 2026
DISCUSSION
Showers have ended across the area this evening as the initial moisture plume shifts north. The combination of clearing skies aloft, moist low levels, and light winds will set the stage for widespread stratus and fog development across the lower valleys tonight. Recent satellite imagery already shows stratus expanding across the Upper Treasure and Western Magic Valleys, as well as the Burns Basin. Expect this deck to expand overnight into the Lower Treasure Valley and Upper Weiser Basin.
Fog is more likely in Long Valley later tonight where skies will remain completely clear, allowing for more efficient radiational cooling.
On Thursday, the upper level low will linger near the California and Nevada border. While much of the day will see partial clearing and stable conditions, cool air aloft and lingering moisture will provide enough instability for isolated showers in the afternoon. These will be most prevalent over the higher terrain of the Boise Mountains and the south central Idaho highlands. Partial clearing of the stratus is possible Thursday afternoon across the Treasure Valley, but clouds are likely to persist (40% chance) from Mountain Home eastward through the Western Magic Valley. Temperatures will remain near or slightly above seasonal normals, with highs in the 40s for most valley locations, though areas that remain trapped under the stratus and fog will see limited warming.
AVIATION
Areas of MVFR-IFR in low stratus. IFR-VLIFR in patchy fog/mist developing overnight. Mtn obscuration.
Improvement of fog late Thu morning, but stratus lingering into Thu afternoon. A 20% chance of rain/mixed showers across SW Idaho mtns and SE Oregon Thursday PM. Surface winds: variable up to 10 kt. Winds aloft at 10kft MSL: W to NW 5-15 kt.
KBOI.. MVFR-IFR in low stratus and mist overnight. Stratus ceilings lifting late Thu morning, then eroding Thu afternoon.
Surface winds: light and variable.
PREV DISCUSSION
SHORT TERM
Tonight through Friday night
Showers dry up this evening with a slight chance lingering over higher terrain along the ID/NV border into Thursday. Increased moisture near the surface will lead to fog and low-cloud development across SE Oregon and areas of SW Idaho. Leaning toward low-clouds being the dominant feature in the lower Snake Plain with greater fog coverage across SE Oregon and higher terrain of SW ID (to include the western Magic Valley) where clouds will be more likely to intersect the terrain. In these areas have gone with dense fog wording but not enough coverage to warrant products.
Thursday is mostly dry with fog/stratus breaking by early afternoon. With the upper trough axis overhead, or just to the east, we could see afternoon 'popcorn' showers over the mtns of SE Oregon and w-central ID and have a slight chance (15%) to cover the potential. Another round of fog/stratus Thursday night as a flat ridge works in aloft. Clouds will increase on Friday as another trough approaches the West Coast and southwest flow increases moisture aloft. Temperatures through the period will be at or slightly above normal.
LONG TERM
Saturday through Wednesday
The long term continues to look wet and unsettled, with more cooling than previous forecasts as well. A deep longwave trough will remain positioned along the west coast as subsequent lows from the Gulf of Alaska keep it stalled and energetic through Wednesday. The forecast Saturday and Sunday calls for increasing clouds, with a 20-30% chance of precipitation. More widespread precipitation is expected north and west of the area, and will move in later in the long term. Over the weekend the wetter flow is kept out of the area by strong southwest flow aloft, which will keep temperatures about 5 degrees above normal. The low amplifies Monday and Tuesday and we move into the more favorable moisture band. Precipitation chances increase to 40-80% Monday evening through Tuesday, highest in mountains. Temps cool down to a few degrees below normal by Wednesday, and unsettled conditions continue.
BOI WATCHES/WARNINGS/ADVISORIES
ID...None.
OR...None.
Link to 1 hour of 5 minute data for KBOI
Terminal Aerodrome Forecast (TAF) for KBOI
Wind History Graph: BOI
(wind in knots)
GEOS Local Image of Pacific Northwest
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