Boise, Idaho – A warmer-than-normal and wetter weather pattern is expected to develop across Idaho heading into Valentine’s Day weekend, increasing the likelihood of rain in lower valleys, heavier snow in the mountains, and changing travel conditions from Saturday through midweek. While no single high-impact winter storm is currently locked in, repeated systems could create cumulative impacts across highways and mountain passes.
According to the National Weather Service Climate Prediction Center, Idaho is favored for above-normal precipitation and above-normal temperatures during the February 14–18 period. This setup reduces prolonged Arctic cold while allowing Pacific moisture to push inland across the Northwest and northern Rockies.
In southern Idaho, including Boise, Nampa, and the I-84 corridor, milder daytime temperatures may allow precipitation to fall mainly as rain. Overnight cooling could still bring periods of wet snow or slush, increasing the risk for slick travel during early morning hours on bridges and elevated roadways.
Across eastern Idaho, including Idaho Falls, Rexburg, and Pocatello, temperatures may hover closer to freezing at night, allowing precipitation to shift between rain and wet snow. Slushy conditions are possible at times along I-15 and U.S. 20, particularly during overnight and early morning travel windows.
Central Idaho and mountain communities, including Stanley, McCall, and Sun Valley, are expected to see more consistent snowfall. Warmer air aloft may lead to heavier, moisture-laden snow, increasing impacts over Galena Summit, Banner Summit, and other high-elevation routes.
In northern Idaho, including Coeur d’Alene, Sandpoint, and Lewiston, rain is likely at lower elevations while surrounding mountains see snow. Additional precipitation falling on existing snowpack may increase runoff into rivers and streams later in the period.
The Idaho Transportation Department advises travelers to monitor conditions closely as precipitation types change. Air travel through Boise Airport and regional terminals may see occasional delays during periods of low ceilings or steadier precipitation.
This warmer, wetter pattern is expected to persist into midweek. Additional advisories may be issued as individual systems become clearer, and residents are urged to stay alert for updated alerts, especially for mountain travel and overnight driving conditions.
