Iowa 7-Day Forecast: Highs in the Mid-80s to 90°F Through July 11

What changed

The National Weather Service forecast for the Des Moines area (DMX grid point 73,49) shows a week of consistent summer heat without extreme spikes. Here's the day-by-day outlook:

| Day | High (°F) | Low (°F) | |---|---|---| | Saturday, Jul 4 (Independence Day) | 86 | 68 (tonight) | | Sunday, Jul 5 | 85 | 66 | | Monday, Jul 6 | 86 | 66 | | Tuesday, Jul 7 | 88 | 68 | | Wednesday, Jul 8 | 90 | 70 | | Thursday, Jul 9 | 87 | 67 | | Friday, Jul 10 | 86 | 67 |

The warmest afternoon is Wednesday at 90°F. The warmest overnight low is also Wednesday night at 70°F. Lows on the cooler end — Sunday and Monday nights — dip to 66°F.

Why it matters

Early July is prime pollination time for much of Iowa's corn crop. Daytime highs in the mid-80s to low 90s are warm but stay below the thresholds that typically raise heat-stress concerns for pollinating corn. Overnight lows in the mid-to-upper 60s allow some nighttime cooling. This forecast is a step down from the hotter readings some areas saw in late June.

For soybeans still in vegetative stages, these temperatures support steady growth. The forecast itself doesn't include precipitation data, so rainfall is worth tracking separately.

What to watch next

• Wednesday's 90°F high — if actual temps run hotter than forecast, that could matter for fields actively shedding pollen.
• Overnight lows — the 70°F low Wednesday night is the highest of the week. Warmer nights during pollination may affect kernel set.
• Rainfall — this forecast covers temperature only. Check local NWS or mesonet sources for precipitation outlooks.

Source notes

All temperatures from the U.S. National Weather Service API, Des Moines (DMX) grid point 73,49, covering July 4–11, 2026. This is a point forecast for central Iowa and may not reflect conditions across the entire state.