Castac Lake Weather Forecast
- 58
- 72
Chance Rain Showers
- 58
- 76
Mostly Sunny
- 58
- 75
Mostly Sunny
- 60
- 78
Chance Rain Showers
- 59
- 79
Chance Rain Showers
- 59
- 80
Mostly Sunny
Today 19 Sep Grapevine
Partly sunny. Chance of rain early in the Morning, then chance of rain Showers and slight chance of Thunderstorms in the late morning and afternoon. Some Thunderstorms may produce heavy rainfall in the late morning and afternoon. Highs 68 to 76. Southeast Winds up to 10 Mph shifting to the east in the afternoon. Chance of precipitation 50 percent.
Tonight 19 Sep Grapevine
Mostly cloudy with a 20 percent chance of rain in the Evening, then mostly clear after midnight. Lows 57 to 65. Northwest Winds up to 5 Mph.
Castac Lake Temperature Statistics
September Temperature
Sandberg (8.7 miles)
Lowest 11 September, 2025
48.9 °FAverage September
70.1 °FHighest 1 September, 2025
91 °F
Climate (2020–Present)
Sandberg (8.7 miles)
Average Low 2020–2025
51.6 °FAverage 2020–2025
59.4 °FAverage High 2020–2025
68.2 °F