Lake Mercer Weather Forecast
- 44
- 69
Becoming Sunny
- 48
- 68
Chance Rain Showers
- 43
- 59
Chance Rain
- 43
- 62
Mostly Sunny
- 57
- 73
Slight Chance Thunderstorms
- 61
- 80
Chance Rain Showers
- 58
- 75
Rain Showers Likely
Today 30 Apr Fairfax
Mostly sunny. Highs in the upper 60s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.
Tonight 30 Apr Fairfax
Mostly clear. Lows in the lower 40s. Northwest Winds 10 to 15 Mph.
Lake Mercer Temperature Statistics
April Temperature
Fort Belvoir (4.3 miles)
Lowest 9 April, 2026
34.9 °FAverage April
63 °FHighest 16 April, 2026
92.8 °F
Climate (2021–Present)
Fort Belvoir (4.3 miles)
Average Low 2021–2026
47.7 °FAverage 2021–2026
58 °FAverage High 2021–2026
68.3 °F