Waterloo Lake Weather Forecast
- 53
- 66
Chance Rain Showers
- 47
- 59
Rain Showers Likely
- 51
- 70
Mostly Sunny
- 55
- 76
Mostly Sunny
- 63
- 79
Mostly Cloudy
- 67
- 83
Slight Chance Thunderstorms
Today 30 Apr Grayson
Cloudy with a 50 percent chance of Showers. Highs in the mid 60s. East Winds 5 to 10 Mph.
Tonight 30 Apr Grayson
Cloudy with a 40 percent chance of Showers. Lows in the lower 50s. Northeast Winds 5 to 10 Mph.
Waterloo Lake Temperature Statistics
April Temperature
Sherman/Denison, Grayson County Airport (5.6 miles)
Lowest 19 April, 2026
38.1 °FAverage April
66 °FHighest 13 April, 2026
84.2 °F
Climate (2021–Present)
Sherman/Denison, Grayson County Airport (5.6 miles)
Average Low 2021–2026
55.8 °FAverage 2021–2026
64.5 °FAverage High 2021–2026
76.9 °F