Iowa 7-Day Forecast: Sustained Heat With Highs 88°F to 93°F Through July 9
Today (Wed, July 2): High of 91°F
overnight low 73°F (Wednesday night into Thursday)
Saturday, July 4 (Independence Day): High of 91°F
Saturday night overnight low 69°F
Tuesday night overnight low 69°F
Wednesday night overnight low 69°F
What changed
The National Weather Service forecast for central Iowa shows no real break from the heat over the next seven days. Here's the day-by-day outlook:
- Today (Wed, July 2): High of 91°F, overnight low 73°F
- Friday, July 3: High of 93°F — the hottest day in the forecast — overnight low 72°F
- Saturday, July 4 (Independence Day): High of 91°F, overnight low 69°F
- Sunday, July 5: High of 88°F, overnight low 68°F
- Monday, July 6: High of 89°F, overnight low 68°F
- Tuesday, July 7: High of 91°F, overnight low 69°F
- Wednesday, July 8: High of 91°F, overnight low 69°F
Friday looks like the peak at 93°F. The coolest daytime reading is Sunday at 88°F. Overnight lows range from 68°F to 73°F, with the warmest night tonight (Wednesday into Thursday) at 73°F.
Why it matters
Early July is when a lot of Iowa corn is either approaching or actively in pollination, and soybeans are moving into flowering and early pod set. Daytime highs in the low 90s aren't automatically damaging, but a week straight of them — especially paired with overnight lows that don't dip much below 70°F — could add up to heat stress if moisture is short. Warm nights mean the crop doesn't get as much of a recovery period. The combination of duration and nighttime temps is what may matter most here.
What to watch next
- Updated forecasts: NWS forecasts shift, so check back around July 5–6 to see if the Tuesday–Wednesday heat holds or moderates.
- Rainfall: This forecast covers temperature only. Soil moisture and any rain chances could affect how crops handle the heat — check your local NWS office for precipitation outlooks.
- Crop condition reports: USDA's weekly Crop Progress report (typically released Mondays) will show whether Iowa corn and soybean conditions hold steady or start to slip.
Source notes
All temperature data from the U.S. National Weather Service API, covering the Des Moines (DMX) forecast area. This is a point forecast for central Iowa and may not reflect conditions across the entire state.
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