El Capitan Reservoir Weather Forecast
- 66
- 89
Chance Thunderstorms
- 64
- 88
Chance Rain Showers
- 63
- 86
Slight Chance Thunderstorms
- 64
- 89
Mostly Sunny
- 67
- 91
Partly Sunny
- 68
- 91
Mostly Sunny
- 66
- 92
Mostly Sunny
Today 17 Sep San Diego County Inland Valleys
Mostly cloudy. A slight chance of Showers and Thunderstorms this afternoon. Highs 81 to 86. Areas of Winds west to 10 Mph. Chance of measurable precipitation 20 percent.
Tonight 17 Sep San Diego County Inland Valleys
Mostly cloudy with a chance of Showers and a slight chance of Thunderstorms. Lows 64 to 68. Areas of Winds northwest to 10 Mph this evening becoming light. Chance of measurable precipitation 50 percent.
El Capitan Reservoir Temperature Statistics
September Temperature
Ramona, Ramona Airport (11.8 miles)
Lowest 9 September, 2025
53.1 °FAverage September
73.9 °FHighest 2 September, 2025
97 °F
Climate (2020–Present)
Ramona, Ramona Airport (11.8 miles)
Average Low 2020–2025
51.2 °FAverage 2020–2025
64.1 °FAverage High 2020–2025
76.6 °F