Boise, Idaho – Summer heat is building in southern Idaho, and Boise residents should brace for rising temperatures and glaring afternoon sun starting Saturday.
According to the National Weather Service, Boise will see mostly sunny skies Saturday with a high near 81°F. Winds will stay calm, shifting slightly westward at 5 to 7 mph in the afternoon. As temperatures rise, drivers on Highway 55 and I-84 should expect strong sun glare and heat-related vehicle strain, especially during peak weekend travel.
Sunday brings even hotter conditions, with Boise climbing to 88°F under clear skies. Memorial Day Monday will stay warm and dry with a high near 82°F—ideal for outdoor plans, but heat precautions are advised. Keep hydrated, wear sunscreen, and avoid prolonged midday exposure. By Tuesday, sunny skies continue with highs near 82°F. Winds remain light through the early week.
Extended 5-Day Outlook:
- Tuesday Night: Partly cloudy, low around 56°F
- Wednesday: Sunny and hot, reaching 90°F
- Wednesday Night: Clear, low around 60°F
- Thursday: A 20% chance of afternoon showers, high near 91°F
This stretch marks Boise’s first real taste of summer. With no rain expected until Thursday and rising heat across the Treasure Valley, locals should monitor air quality, stay cool indoors during afternoon hours, and prep gardens or lawns for dry conditions.
Temperatures will peak Thursday. No advisories are in place yet, but NWS may issue heat-related updates if conditions intensify.
