Rattlesnake Lake Weather Forecast
- 68
- 84
Chance Thunderstorms
- 68
- 84
Chance Thunderstorms
- 67
- 86
Partly Sunny
- 70
- 86
Rain Showers Likely
- 70
- 83
Rain Showers Likely
- 73
- 87
Chance Thunderstorms
Today 23 May Hays
Mostly cloudy. A slight chance of Showers and Thunderstorms in the Morning, then Showers and Thunderstorms likely in the afternoon. Some Thunderstorms may produce heavy rainfall in the morning. Locally heavy rainfall possible in the afternoon. Highs in the lower 80s. Temperature falling into the upper 70s in the afternoon. Southeast Winds 5 to 10 Mph. Chance of rain 70 percent.
Tonight 23 May Hays
Partly cloudy late this Evening, then becoming mostly cloudy. Showers and Thunderstorms likely late this Evening, then a chance of Showers and Thunderstorms. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the lower 70s. Southeast Winds around 5 Mph. Chance of rain 70 percent.
Rattlesnake Lake Temperature Statistics
May Temperature
San Marcos, San Marcos Municipal Airport (16.2 miles)
Lowest 2 May, 2026
50 °FAverage May
73.7 °FHighest 19 May, 2026
91.9 °F
Climate (2021–Present)
San Marcos, San Marcos Municipal Airport (16.2 miles)
Average Low 2021–2026
60 °FAverage 2021–2026
70.7 °FAverage High 2021–2026
82.4 °F