Iowa 7-Day Forecast: Highs 73°F to 83°F Through June 25

What changed

Here's the day-by-day outlook from the National Weather Service (Des Moines grid point):

| Day | High (°F) | Low (°F) | |---|---|---| | Thursday, June 18 | 76 | 57 | | Friday, June 19 | 80 | 63 | | Saturday, June 20 | 83 | 63 | | Sunday, June 21 | 73 | 56 | | Monday, June 22 | 76 | 56 | | Tuesday, June 23 | 78 | 60 | | Wednesday, June 24 | 82 | 62 |

The warmest day in the window is Saturday at 83°F. The coolest overnight lows hit 56°F on Sunday and Monday nights. Mid-week temps climb back toward the low 80s by Wednesday at 82°F.

Why it matters

For corn that's likely in the V6–V10 range across much of Iowa right now, daytime highs in the mid-70s to low 80s keep the crop moving through rapid leaf-stage development. Overnight lows in the upper 50s and low 60s are cool enough to slow respiration losses without threatening any cold damage. No extreme heat (95°F+) is in this forecast, so heat-stress concerns are off the table for the next week.

Soybeans in early vegetative stages benefit from the same temperature window. The steady warmth could support good canopy development heading into late June.

What to watch next

• Weekend cool-down: Sunday's high drops to 73°F with a 56°F low. Worth watching whether that dip comes with any precipitation — the NWS temperature data alone doesn't tell us about rainfall.
• Late-week warm-up: Wednesday's 82°F high suggests temps may keep climbing into the following week. If highs push into the upper 80s or 90s, that could start to matter for pollination timing on early-planted corn.
• Local variation: This forecast is based on the Des Moines NWS grid point. Conditions across northern and western Iowa may differ — check your local NWS office for field-level detail.

Source notes

All temperature data from the U.S. National Weather Service API (Des Moines/DMX grid point 73,49 forecast), accessed June 18, 2026. NWS forecast link.