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.
Get the WASDE in your inbox — minutes after USDA drops it.
Every supply-and-demand table that moved, with the underlying USDA links. Free. Unsubscribe anytime.
More from this desk
- Weather · July 24, 2026Iowa 7-Day Forecast: Highs From 91°F to 96°F Through July 22
Central Iowa's NWS forecast calls for daytime highs of 91°F to 96°F from Thursday through Monday, with overnight lows in the low-to-mid 70s. A slight cool-down arrives Tuesday and Wednesday, with highs near the upper 80s.
- Weather · July 21, 2026Iowa 7-Day Forecast: 97°F Today, Cool-Down to Low 80s Midweek, Heat Back by Sunday
Today's 97°F high in central Iowa drops to the low 80s Wednesday through Friday, with overnight lows in the low 60s. Relief is short-lived — Saturday rebounds to 88°F and Sunday jumps back to 94°F.
- Weather · July 19, 2026Iowa 7-Day Forecast: 97°F Monday, Then a Cool-Down Into the Mid-80s
Monday is the hottest day ahead for Iowa, with a forecast high of 97°F. Temperatures drop quickly after that — down to the low-to-mid 80s by Wednesday — giving corn and soybeans some relief during a critical stretch of the growing season.
- Weather · July 17, 2026Iowa 7-Day Forecast: Sustained Heat — Highs 92°F to 96°F Through July 22
Iowa is looking at a prolonged heat run: daytime highs of 92°F to 96°F from Thursday through Monday, with overnight lows mostly in the low-to-mid 70s. Tuesday eases to 87°F. That's five consecutive days above 90°F during peak corn pollination and early soybean pod-set timing.