Tomorrow Hourly Weather Forecast for Waterloo, IA

Hourly Weather | Tomorrow › Tuesday, June 30, 2026

Active Weather Warnings

Extreme Heat Watch
Extreme Heat Warning

Waterloo, Iowa

12 AM

82°

Feels Like 88°

Humidity: 74%

UV Index: 0

Wind: 12 mph

1 AM

81°

Feels Like 84°

Humidity: 76%

UV Index: 0

Wind: 12 mph

2 AM

81°

Feels Like 82°

Humidity: 78%

UV Index: 0

Wind: 10 mph

3 AM

79°

Feels Like 81°

Humidity: 81%

UV Index: 0

Wind: 10 mph

4 AM

77°

Feels Like 81°

Humidity: 83%

UV Index: 0

Wind: 10 mph

5 AM

75°

Feels Like 79°

Humidity: 85%

UV Index: 0

Wind: 9 mph

6 AM

73°

Feels Like 77°

Humidity: 89%

UV Index: 0

Wind: 9 mph

7 AM

77°

Feels Like 81°

Humidity: 83%

UV Index: 1

Wind: 10 mph

8 AM

81°

Feels Like 84°

Humidity: 77%

UV Index: 2

Wind: 10 mph

9 AM

82°

Feels Like 88°

Humidity: 72%

UV Index: 4

Wind: 13 mph

10 AM

84°

Feels Like 91°

Humidity: 68%

UV Index: 5

Wind: 13 mph

11 AM

86°

Feels Like 95°

Humidity: 65%

UV Index: 7

Wind: 14 mph

12 PM

88°

Feels Like 97°

Humidity: 62%

UV Index: 9

Wind: 15 mph

1 PM

90°

Feels Like 99°

Humidity: 58%

UV Index: 10

Wind: 16 mph

2 PM

91°

Feels Like 100°

Humidity: 56%

UV Index: 9

Wind: 15 mph

3 PM

91°

Feels Like 100°

Humidity: 53%

UV Index: 7

Wind: 16 mph

4 PM

93°

Feels Like 100°

Humidity: 52%

UV Index: 5

Wind: 16 mph

5 PM

91°

Feels Like 99°

Humidity: 55%

UV Index: 4

Wind: 15 mph

6 PM

91°

Feels Like 99°

Humidity: 58%

UV Index: 2

Wind: 14 mph

7 PM

90°

Feels Like 97°

Humidity: 61%

UV Index: 1

Wind: 13 mph

8 PM

88°

Feels Like 93°

Humidity: 65%

UV Index: 0

Wind: 12 mph

9 PM

86°

Feels Like 91°

Humidity: 70%

UV Index: 0

Wind: 10 mph

10 PM

82°

Feels Like 90°

Humidity: 76%

UV Index: 0

Wind: 10 mph

11 PM

82°

Feels Like 88°

Humidity: 78%

UV Index: 0

Wind: 10 mph

Weather Alerts and Warnings for Waterloo

Severe Future Likely

Extreme Heat Watch

Extreme Heat Watch issued June 27 at 6:58PM CDT until June 30 at 9:00PM CDT by NWS Des Moines IA

Jun 28, 1:00 PM → Jun 30, 9:00 PM

WHAT: Dangerously hot conditions with heat index values exceeding
100 degrees multiple days.

WHERE: Grundy, Butler, Cerro Gordo, Franklin, Hancock, Winnebago,
Worth, Black Hawk, and Bremer Counties.

WHEN: From Sunday afternoon through Tuesday evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.

ADDITIONAL DETAILS: Excessive heat will persist through much of
next week, potentially including the 4th of July weekend.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Updated: Jun 27, 11:42 PM Source: NWS Alert

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued June 29 at 9:17PM CDT until July 1 at 10:00PM CDT by NWS Des Moines IA

Jun 29, 9:17 PM → Jul 1, 10:00 PM

WHAT: Dangerously hot conditions with heat index values up to
around 105 expected.

WHERE: Most of central Iowa

WHEN: Until 10 PM CDT Wednesday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.

ADDITIONAL DETAILS: Extreme heat will persist through much of
next week, potentially including the 4th of July weekend.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

Updated: Jun 29, 9:39 PM Source: NWS Alert

Weather Alerts and Warnings for Waterloo

Extreme Heat Watch

Extreme Heat Warning

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