Sun Valley
September 11 in the books — no snow ever recorded on this date (23 years in the books). All-time single day: 14.0″ on Jan 27, 2008.
Stoke today Sep 11
Next 24 hours forecast
Forecast
0.0″
best available forecast · as of Sep 11 08:56
NWS 0.0″ · Open-Meteo 0.0″
Last 24 hours measured
Station
0.0″
Chocolate Gulch SNOTEL · 11.6 km · depth 0.0″ · rolling 24 h, observed Sep 11 05:00
Resort
—
resort isn’t reporting yet
Next 48 hours
10-day outlook
Forecast data: National Weather Service; Weather data by Open-Meteo.com (CC BY 4.0); Data from MET Norway (CC BY 4.0) — adapted by SnowAlert.
In the forecaster’s words
Overnight
Mostly clear. Low around 43, with temperatures rising to around 52 overnight. West wind around 3 mph.
Today
Sunny, with a high near 61. West wind 5 to 13 mph, with gusts as high as 24 mph.
Tonight
Mostly clear. Low around 40, with temperatures rising to around 42 overnight. West northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
Patchy smoke between 4pm and 5pm. Mostly sunny, with a high near 63. South southwest wind 5 to 12 mph, with gusts as high as 23 mph.
Saturday Night
Mostly cloudy, with a low around 37. South wind 3 to 10 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 51. Southwest wind 9 to 15 mph, with gusts as high as 24 mph.
Forecast discussion PIH · Sep 11 05:30
- Red Flag Warning in the Snake River plain and Teton Valley (Fire Weather Zone 410) today noon to 9 PM for low humidity and gusty wind. Fire Weather Watch on Saturday noon to 9 pm due to low humidity and gusty wind. - Saturday afternoon temperatures warm for most, then Sunday afternoon temperatures cool 12 to 16 degrees, ending critical fire weather conditions. Windy conditions through Sunday. - Isolated dry thunderstorms expected in the southeast corner of forecast area today, then again on Sunday but along Montana border.
Read the full discussion
000 FXUS65 KPIH 111130 AFDPIH Area Forecast Discussion National Weather Service Pocatello ID 530 AM MDT Fri Sep 11 2026 .KEY MESSAGES... - Red Flag Warning in the Snake River plain and Teton Valley (Fire Weather Zone 410) today noon to 9 PM for low humidity and gusty wind. Fire Weather Watch on Saturday noon to 9 pm due to low humidity and gusty wind. - Saturday afternoon temperatures warm for most, then Sunday afternoon temperatures cool 12 to 16 degrees, ending critical fire weather conditions. Windy conditions through Sunday. - Isolated dry thunderstorms expected in the southeast corner of forecast area today, then again on Sunday but along Montana border. && .DISCUSSION... Issued at 145 AM MDT Fri Sep 11 2026 Today through Sun night...Strong upper level flow will be mixing down to the surface. It should be stronger than yesterday. Combined with continued very low humidity over a slightly smaller portion of the lower elevations, Red Flag Warning has been re-issued for the Idaho Falls WFS area, Fire Weather Forecast Zone 410. The area of strongest wind shifts farther southward on Saturday, and there is potential for low humidity to continue there as well. The strongest wind is expected Sunday, as a trough moving through over Sat night brings the tightest gradient of the next three days. The passage of the trough Sat night brings a strong cooling, similar to something seen more in a winter regime, hinting at a coming transition. Afternoon highs should cool 12 to 16 deg F from Sat to Sun. The expected rainfall amounts have collapsed to near zero for this period. It is rainer this morning than any other period. This was the trend yesterday with Sat returning to temperatures warmer than Fri. The cool down previously from Sat to Sun was in excess of 20 deg F. This is indicative of reduced cloud cover and moisture. Mon through Thu...A lingering troughing continues on Mon, so there as an additional 2 to 6 deg F cooling. Warming returns Tue as the Gem State sits between two highs, with a closed low developing off the OR-WA coast. The ridges strengthen during this period, thus bringing warmer temperatures, getting back above normal for the time of year by Wed. It also should bring lighter wind as early as Mon. Near zero threat of precipitation or thunderstorm activity during this mid-range forecast period. && .AVIATION /12Z TAFS THROUGH 12Z SATURDAY/... Issued at 524 AM MDT Fri Sep 11 2026 Occasional light rain has cleared KSUN and KBYI. The clearing line also somewhat lines up with the onset of gusty wind, which will dominate the TAFs today. Not expecting any concerns with impactful CIGs or VSBYs, with only KDIJ having morning -SHRA, with KPIH having VCSH. Wind will peak with G35KT at KIDA, G30KT at KDIJ and KPIH, G25KT at KSUN, and G20KT at KBYI. Wind subsides during the evening 12/00Z to 12/04Z, depending on location, but wind returns Sat afternoon. Strongest wind on Sun afternoon. && .FIRE WEATHER... Issued at 145 AM MDT Fri Sep 11 2026 Strong upper level flow will be mixing down to the surface. It should be stronger than yesterday. Combined with continued very low humidity over a slightly smaller portion of the lower elevations, Red Flag Warning has been re-issued for the Idaho Falls WFS area, Fire Weather Forecast Zone 410. The area of strongest wind shifts farther southward on Saturday, and there is potential for low humidity to continue there as well. Thus a Fire Weather Watch was issued for Fire Weather Zone 427 on Sat. The strongest wind is expected Sunday, as a trough moving through over Sat night brings the tightest gradient of the next three days. However, the cooling keeps afternoon humidity well above the 15 percent critical threshold. Temperatures bottom out on Mon, as wind dies down strongly and high pressure returns to the northern Great Basin. && .PIH WATCHES/WARNINGS/ADVISORIES... Red Flag Warning from noon today to 9 PM MDT this evening for IDZ410. Fire Weather Watch from Saturday afternoon through Saturday evening for IDZ427. && $$ DISCUSSION...Messick AVIATION...Messick FIRE WEATHER...Messick
Sources & last updated
- Data from MET Norway — CC BY 4.0, adapted by SnowAlert fetched Sep 11 08:15
- National Weather Service fetched Sep 11 08:56
- Weather data by Open-Meteo.com, from the ECMWF and NOAA models — CC BY 4.0, adapted by SnowAlert fetched Sep 11 06:59
- USDA NRCS SNOTEL fetched Sep 11 06:35