Waterloo Weather Forecast
- 68
- 92
Sunny
- 70
- 96
Mostly Sunny
- 70
- 97
Hot
- 69
- 94
Mostly Sunny
- 70
- 91
Slight Chance Thunderstorms
- 65
- 89
Slight Chance Thunderstorms
Today 13 Jul Jefferson
Hot, sunny. Highs in the lower 90s. West Winds 5 to 10 Mph. Highest heat index Readings 95 to 99 in the afternoon.
Tonight 13 Jul Jefferson
Mostly clear. Lows in the upper 60s. West Winds up to 5 Mph. Highest heat index Readings 95 to 97 in the evening.
Waterloo Temperature Statistics
July Temperature
Watertown (13 miles)
Lowest 7 July, 2026
53.2 °FAverage July
75.1 °FHighest 1 July, 2026
91.6 °F
Climate (2021–2026)
Watertown (13 miles)
Average Low 2021–2026
35.2 °FAverage 2021–2026
44.9 °FAverage High 2021–2026
53.9 °F