| National Weather Service Forecast for:
Waterloo IA Issued by: National Weather Service Des Moines, IA |
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| Updated: 1:31 am CDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
Clear, with a low around 59. Calm wind. |
| Thursday |
Sunny, with a high near 81. Calm wind becoming south 5 to 7 mph in the afternoon. |
| Thursday Night |
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66. South wind around 7 mph. |
| Friday |
Sunny, with a high near 82. Southwest wind 6 to 10 mph becoming west northwest in the afternoon. |
| Friday Night |
Mostly clear, with a low around 64. Northwest wind 3 to 8 mph. |
| Saturday |
Sunny, with a high near 78. |
| Saturday Night |
Mostly clear, with a low around 58. |
| Sunday |
Mostly sunny, with a high near 76. |
| Sunday Night |
Partly cloudy, with a low around 59. |
| Monday |
Mostly sunny, with a high near 75. |
| Monday Night |
Partly cloudy, with a low around 62. |
| Tuesday |
Mostly sunny, with a high near 80. |
| Tuesday Night |
Partly cloudy, with a low around 65. |
| Wednesday |
Mostly sunny, with a high near 80. |
Forecast from NOAA-NWS for Waterloo IA.
