Overview

Hot and humid conditions continue across Dubuque and much of eastern Iowa under a Heat Advisory through Thursday evening. Highs remain in the upper 80s to low 90s for several days, with heat index values frequently approaching or exceeding 100°F in the afternoon. Isolated to scattered showers and thunderstorms are possible at times, especially later in the period. A gradual cooling trend begins by early next week.

Daily Forecast

•  Wednesday, September 2 (Today): Mostly sunny with a slight chance of afternoon or evening thunderstorms. High near 91°F. Southwest winds 5–10 mph. Overnight low around 74°F with partly cloudy skies and a slight chance of storms after midnight.

•  Thursday, September 3: Mostly cloudy early, becoming sunnier. Chance of showers and thunderstorms (around 40%), mainly in the morning/early afternoon. High near 89°F. Low around 73°F.

•  Friday, September 4: Chance of morning showers/thunderstorms, then mostly sunny. High near 91°F. Low around 72°F.

•  Saturday, September 5: Mostly sunny and still warm. High near 90°F. Low around 69°F with a slight chance of late-night showers.

•  Sunday, September 6: Partly sunny with a 40% chance of showers and thunderstorms. High near 86°F. Low around 67°F.

•  Monday, September 7 (Labor Day): Partly sunny with a 30% chance of showers. High near 83°F. Low around 65°F.

•  Tuesday, September 8: Partly sunny. High near 83°F.

Notes

Stay hydrated and limit outdoor activity during peak afternoon heat. Check the latest NWS updates for any changes to the Heat Advisory or storm chances, as isolated activity can develop quickly in this pattern.

Northeast Iowa Today’s High Temperature Map

Here’s an original illustrative weather map of Northeast Iowa showing approximate forecast high temperatures for today (Wednesday, September 2, 2026):

Key cities (today’s highs):

•  Dubuque: ~91°F

•  Cedar Rapids: ~92–93°F

•  Waterloo: ~88°F

•  Decorah: ~86°F

•  Oelwein: ~86°F

•  Iowa City: ~94°F

•  Quad Cities area: ~93°F

Temperatures are generally hottest in the southern and central portions of the region and a few degrees cooler farther north. Heat indices will feel several degrees higher due to humidity.