Forecasts and growing-season conditions that move the market.

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.

Iowa's NWS forecast shows daytime highs ranging from 92°F today (July 13) up to 97°F on Friday, with no real break in sight through Sunday, July 20. Overnight lows hold in the 68–75°F range, which limits nighttime cooling for corn and soybeans during a critical stretch of the growing season.

Central Iowa daytime highs start at 89°F today (July 12) and ramp up to 95–96°F from Wednesday through Saturday, with overnight lows mostly in the low-to-mid 70s. That's a sustained heat stretch landing right in the corn pollination window.

Central Iowa daytime highs run 85–90°F through Friday, July 11, with overnight lows in the mid-to-upper 60s. Wednesday, July 8, is the warmest day in the forecast at 90°F.

Iowa highs start around 86–88°F this week and climb to 95°F by Monday, July 13. Overnight lows range from 67°F to 73°F, with the warmest night Monday — meaning less nighttime cooling right when many corn fields may be pollinating.

Iowa's NWS forecast shows daytime highs rising from 88°F today to 94°F by Thursday and Friday, with overnight lows climbing from 65°F to 74°F — a full week of building heat that lines up with corn pollination timing across much of the state.

Iowa daytime highs are forecast to rise from 87°F today (Friday, July 10) to 94°F by Wednesday and Thursday next week, with an overnight low near 68°F tonight. That puts much of the state in sustained heat right during corn pollination timing.

Central Iowa highs are forecast to rise from 84°F on Thursday to 94°F by next Tuesday, with overnight lows in the upper 60s to low 70s. That puts Monday and Tuesday squarely in the 90s during a stretch when many Iowa corn fields could be pollinating.

Central Iowa is looking at a steady stretch of heat from July 3 through July 10, with daytime highs running 86°F to 91°F and nighttime lows between 66°F and 70°F.

Iowa is looking at a full week of heat: today tops out at 96°F, the midweek stretch stays in the low-to-mid 90s, and the weekend eases only slightly to 89°F. Overnight lows hold in the upper 60s to mid-70s. This lands right during the corn pollination window and early soybean bloom — both heat-sensitive stages worth watching closely.

Iowa is looking at a solid week of heat: daytime highs running 88°F to 93°F and overnight lows staying 68°F to 73°F from July 2 through July 9. That kind of sustained warmth lands right in the corn pollination and soybean pod-setting window, making it worth watching closely.

At the Des Moines NWS station as of the morning of June 29, 2026, the temperature sits at 77°F with a dew point of 73.4°F. That gap of less than 4 degrees means the air is nearly saturated — about as muggy as Iowa gets.

Iowa's forecast through June 25 calls for daytime highs between 73°F and 83°F and overnight lows between 56°F and 63°F — warm but not extreme, and right in the range where corn and soybeans can put on steady vegetative growth.

Iowa's forecast through June 18 shows daytime highs ranging from 75°F to 84°F and overnight lows from 55°F to 64°F. No extreme heat or cold stress in the outlook — temperatures sit in a range that supports steady corn and soybean vegetative growth.

As of midday June 4, 2026, the Des Moines NWS station (KDSM) reported 71.6°F with a 57.2°F dew point — comfortable conditions for fieldwork, with light winds and steady pressure.

At 6:15 AM UTC on May 22, 2026, the National Weather Service station at St. Louis (KSTL) reported 64°F (18°C), a 55°F (13°C) dew point, winds near 8 mph (about 13 km/h), and barometric pressure around 30.01 inches of mercury (101,626 Pa). Nothing extreme — just a mild late-May reading for central Missouri.

At the latest observation, Indianapolis registered 59°F (15°C) with a dew point of 48°F (9°C). Winds were running about 10 mph (converted from 16.7 km/h), and barometric pressure sat at about 30.10 inches of mercury (converted from 101,930 Pa). This is a single-station snapshot from the KIND NWS station as of early morning May 22, 2026.

At 11:15 a.m. CDT on June 1, 2026, the Des Moines (KDSM) NWS station recorded 80.6°F with a dew point of 64.4°F. Wind was light at about 4.6 mph, and barometric pressure sat at roughly 30.03 inches of mercury. Here's what that single-station snapshot tells us heading into the first full week of June.

At Minneapolis (KMSP) early this morning, the temperature sat at 54°F with a dew point of 30°F — that's dry air for late May. Winds were around 11.5 mph. These conditions point to good surface drying, which could matter for fieldwork timing across central Minnesota.

At the 9:35 a.m. CT observation from Des Moines (KDSM), the temperature was 66.2°F and the dew point was 64.4°F — a spread of less than 2°F. That narrow gap means relative humidity is very high, which is worth watching for foliar disease pressure on corn and soybeans.

Iowa daytime highs start around 81–83°F early this week and climb to 87–88°F by Saturday and Sunday. Overnight lows rise from the upper 50s to the mid-60s — a straightforward warming trend through June 7.

Central Iowa highs start at 71°F on Friday (May 22) and climb to 84–86°F by Memorial Day through Thursday, with overnight lows ranging from 51°F to 64°F. That's a solid warm-up heading into late May.

Iowa daytime highs start at 85°F today and ramp steadily to 94°F by next Wednesday. That kind of sustained heat during early vegetative growth is worth watching closely.

At the Des Moines station (KDSM) around 9:10 a.m. CDT on May 28, 2026, the temperature was 75.2°F with a dew point of 57.2°F — warm but not humid, with a light breeze near 10 mph and steady barometric pressure at 30.12 inches of mercury.