Lake Mercer Weather Forecast
- 42
- 61
Partly Sunny
- 44
- 61
Partly Sunny
- 44
- 57
Slight Chance Rain Showers
- 49
- 58
Rain Showers Likely
- 44
- 58
Rain Showers Likely
- 41
- 56
Slight Chance Rain Showers
Today 26 Oct Fairfax
Partly sunny. Highs in the lower 60s. Northeast Winds around 5 Mph.
Tonight 26 Oct Fairfax
Partly cloudy. Lows in the lower 40s. Northeast Winds around 5 Mph.
Lake Mercer Temperature Statistics
October Temperature
Fort Belvoir (4.3 miles)
Lowest 24 October, 2025
34.3 °FAverage October
59.5 °FHighest 6 October, 2025
83.1 °F
Climate (2020–Present)
Fort Belvoir (4.3 miles)
Average Low 2020–2025
47.9 °FAverage 2020–2025
58.1 °FAverage High 2020–2025
68.4 °F