Iowa 7-Day Forecast: Highs Climb From 85°F to 94°F as Heat Builds Mid-June

What changed

The National Weather Service forecast for central Iowa shows a clear upward trend in daytime highs over the next seven days:

• Today (Thursday, June 4): 85°F
• Friday, June 5: 86°F
• Saturday, June 6: 88°F
• Sunday, June 7: 86°F
• Monday, June 8: 86°F
• Tuesday, June 9: 91°F
• Wednesday, June 10: 94°F

The week starts warm and then takes a real step up Tuesday and Wednesday, with highs pushing into the low-to-mid 90s.

Why it matters

Most Iowa corn is in early vegetative stages right now, and soybeans are establishing stands. Sustained highs in the upper 80s and 90s can increase evapotranspiration and draw down soil moisture faster than many growers expect in early June. The jump from 86°F on Monday to 91°F on Tuesday and 94°F on Wednesday is the sharpest move in this forecast — that's where heat stress risk could start to climb, especially on lighter soils or fields that haven't had recent rain.

This isn't a one-day spike; it's a building pattern across the week. Fields with good soil moisture reserves will handle it differently than those already running short.

What to watch next

• Updated NWS forecasts later this week — models may adjust the Wednesday peak up or down.
• Overnight lows — if nights stay warm (upper 60s to low 70s), crops get less recovery time, and that compounds daytime heat stress.
• Local rainfall chances — any rain between now and Tuesday could offset some of the moisture demand. Check your local NWS office for precipitation outlooks.
• Crop condition reports — the next USDA Crop Progress report (Monday) may reflect how Iowa stands are handling early-season warmth.

Source notes

All temperature data from the U.S. National Weather Service API, Des Moines (DMX) grid point. Forecast highs are for daytime periods. Local conditions across Iowa will vary — this is a central-Iowa reference point, not a field-level forecast.