Iowa 7-Day Forecast: Highs 86°F to 91°F Through July 10

What changed

The NWS forecast for the Des Moines area (DMX grid point) lays out a consistent warm pattern with no real cool-down in sight through next Thursday night. Here's the day-by-day rundown:

| Day | High (°F) | Night Low (°F) | |---|---|---| | Thursday, July 3 | 91 | 70 | | Saturday, July 4 (Independence Day) | 88 | 68 | | Sunday, July 5 | 86 | 66 | | Monday, July 6 | 86 | 66 | | Tuesday, July 7 | 89 | 68 | | Wednesday, July 8 | 91 | 70 | | Thursday, July 9 | 90 | 69 |

The week starts hot at 91°F today, dips slightly to 86°F Sunday and Monday, then climbs back to 91°F by Wednesday. Overnight lows stay in a narrow band — the coolest nights are Sunday and Monday at 66°F, and the warmest are tonight and Wednesday night at 70°F.

Why it matters

This forecast window lines up with early corn pollination timing across much of Iowa. Sustained daytime highs in the low 90s are worth paying attention to — especially when nighttime lows stay in the upper 60s to 70°F, which limits the crop's ability to recover overnight. The combination of daytime heat and warm nights could affect pollination success if fields are also short on moisture. This is a stretch to keep an eye on, not a crisis — but the lack of a cool break through the full seven days is the part that may matter most.

For soybeans in vegetative stages, this kind of heat generally pushes growth along, but moisture availability is the bigger variable to watch alongside these temperatures.

What to watch next

• Updated NWS forecasts — seven-day outlooks shift, so check back for any changes to the Wednesday–Thursday peak.
• Overnight lows — if those creep above 70°F in updated forecasts, heat stress risk during pollination goes up.
• Local rainfall — these temperature numbers don't tell the moisture story. Pair this forecast with your local precipitation outlook.
• Crop condition reports — USDA's weekly Crop Progress report (typically Monday afternoon) will show how Iowa corn and soybeans are holding up.

Source notes

All temperature data from the U.S. National Weather Service API, Des Moines (DMX) grid point 73,49 forecast. Data accessed July 3, 2026. NWS forecast link.