Boise, Nampa and Twin Falls Brace for 75°F Warmth Tuesday Before Cold Front Brings Mountain Showers and Gusty Winds Across Idaho
BOISE, IDAHO — Idaho is in for a classic spring weather rollercoaster this week, with unseasonably warm temperatures peaking Tuesday before a cold front sweeps through late Tuesday into Wednesday, bringing breezy winds and mountain showers.
Forecasters describe the pattern as “whiplash weather,” with temperatures running well above normal before dropping behind the front.
Tuesday: Near 75°F in the Treasure Valley
Temperatures across the lower elevations of southwest Idaho are expected to surge into the 70s Tuesday, with several communities nearing or surpassing 75°F.
Forecast highs include:
- Boise: 73°F Tuesday
- Nampa: 76°F
- Caldwell: 75°F
- Meridian: 75°F
- Jerome: 76°F
- Twin Falls: 76°F
- Mountain Home: 76°F
Even some higher elevation valleys will see mild conditions, while mountain communities remain cooler but still above seasonal averages.
These readings are well above normal for late March and will give much of the Treasure Valley a taste of early summer.
Clouds and Showers Increase Late Tuesday
While Tuesday will feel warm and dry for much of the day, changes begin late as a cold front approaches.
Forecasters expect:
- Increasing clouds late Tuesday
- Breezy winds developing
- Mountain showers expanding into Wednesday
Precipitation probabilities increase most noticeably in mountain locations, including:
- McCall, where rain and snow shower chances climb significantly
- Stanley, with higher precipitation odds through Tuesday night
- Banner Summit and Bogus Basin, where mountain showers are more likely
Lower valley locations such as Boise, Meridian, and Caldwell have lower rain probabilities but could still see scattered showers as the front passes.
Wednesday: Cooler With Mountain Focus
Behind the front, temperatures trend cooler Wednesday across much of southwest Idaho.
Highs drop back into the upper 50s and low 60s in some areas, especially compared to Tuesday’s warmth.
Mountain areas will be the primary focus for shower activity, while valleys experience more limited precipitation.
Warm Air, Cold Water Risk
Officials are also highlighting an important safety message: warm air temperatures do not mean water temperatures are safe.
Rivers and reservoirs remain cold this time of year. Even water temperatures near 60°F can quickly lead to dangerous cold-water shock. Anyone heading out on the water should wear a life vest and use appropriate cold-water gear.
A True Spring Swing
From nearly 75°F warmth in Boise and surrounding communities Tuesday to breezy, cooler conditions with mountain showers by Wednesday, the region is set to experience a pronounced shift in just 24 to 36 hours.
This kind of rapid change is typical of spring in Idaho — but it can still catch residents off guard.
For continued updates on shifting weather patterns across the West and nationwide, stay with ChicagoMusicGuide.com.