Weekly Weather Report for Dubuque, Iowa

Wednesday, July 29 – Tuesday, August 4, 2026

After a stretch of warm, humid summer days with highs in the upper 80s, Dubuque is in for a welcome cooldown. A system bringing widespread showers and thunderstorms will push through late this week, dropping temperatures into the mid-70s and delivering beneficial rainfall. The first half of the period stays mostly dry and seasonably warm before the relief arrives Friday. 

Wednesday, July 29

Sunny skies dominate. High near 87°F. South wind around 5 mph becoming calm.

Tonight: Mostly clear. Low around 66°F. Calm wind.

Thursday, July 30

Increasing clouds. High near 87°F. Calm wind becoming south around 5 mph.

Thursday night: Mostly cloudy with a 50% chance of showers after 1 a.m. Low around 66°F.

Friday, July 31

Showers, with thunderstorms also possible after 1 p.m. High near 74°F. Chance of precipitation 90%. Rainfall amounts of 1 to 2 inches possible.

Friday night: Showers and possibly a thunderstorm before 1 a.m., then showers likely. Low around 63°F. Chance of precipitation 80%. Additional rainfall of 1 to 2 inches possible.

Saturday, August 1

A 40% chance of showers before 1 p.m., then partly sunny. High near 81°F.

Saturday night: Mostly clear. Low around 63°F.

Sunday, August 2

Sunny. High near 84°F.

Sunday night: Mostly clear. Low around 63°F.

Monday, August 3

Sunny. High near 85°F.

Monday night: Mostly clear. Low around 65°F.

Tuesday, August 4

Mostly sunny. High near 87°F.

Summary

Today and Thursday remain warm and mostly dry under sunny to partly cloudy skies. The real relief kicks in Friday as a soaking rain system moves through, cooling highs into the mid-70s and bringing 1–2 inches (or more) of much-needed precipitation. Weekend and early next-week temperatures rebound into the low-to-mid 80s under mostly sunny skies—still comfortable compared with the recent heat. The Friday rains should help local agriculture and ease any dry conditions without widespread flooding concerns expected in the Dubuque area.

Enjoy the break from the heat, especially this weekend. Have a great week, Dubuque!