Grassy Key Weather Forecast
- 72
- 77
Mostly Sunny
- 75
- 83
Mostly Sunny
- 76
- 85
Mostly Sunny
- 73
- 85
Partly Sunny
- 67
- 81
Slight Chance Rain Showers
- 69
- 77
Mostly Sunny
Today 13 Mar Monroe Middle Keys
Partly sunny with a slight chance of Showers. Highs near 80. East to southeast Winds 10 to 15 Mph. Chance of rain 10 percent.
Tonight 13 Mar Monroe Middle Keys
Mostly clear. Lows in the lower 70s. East to southeast Winds near 10 Mph, becoming light and variable early this evening.
Grassy Key Temperature Statistics
March Temperature
The Florida Keys - Marathon International Airport (6.2 miles)
Lowest 7 March, 2025
59.6 °FAverage March
73.6 °FHighest 5 March, 2025
82.7 °F
Climate (2020–Present)
The Florida Keys - Marathon International Airport (6.2 miles)
Average Low 2020–2025
75.3 °FAverage 2020–2025
80 °FAverage High 2020–2025
85.3 °F