Annual mean 25°C · wettest around June · prevailing wind E
Warmest
30.8 °C
Coldest
21.9 °C
Wettest
22%
Windiest
5.3 m/s
Prevailing
E
4.5 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Key Biscayne over the whole year is 25°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 18°C. The rainy (wet) season in Key Biscayne runs from June to October, peaking in June with a 23% chance of rain on a given day. The dry season is November to May; March is the driest month, at 7%. Winds in Key Biscayne are highest in April, averaging 4.4 m/s (16 km/h), and lightest in July, at 3.1 m/s (11 km/h). The prevailing wind is from the E. The clearest skies in Key Biscayne come in July, when the sky is typically 38% covered; November is the cloudiest month, at 48%.
Month by month Key Biscayne climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
23°C
18°C
21°C
10%
45%
4.2 m/s
75
31
52
February
25°C
21°C
24°C
10%
44%
4.1 m/s
69
52
32
March
25°C
21°C
25°C
7%
40%
4.3 m/s
67
50
33
April
27°C
23°C
27°C
9%
42%
4.4 m/s
54
65
16
May
28°C
25°C
30°C
15%
41%
4.0 m/s
24
68
4
June
29°C
26°C
33°C
23%
43%
3.2 m/s
6
50
0
July
30°C
27°C
34°C
19%
38%
3.1 m/s
3
36
0
August
31°C
27°C
34°C
22%
39%
3.2 m/s
2
34
0
September
30°C
27°C
33°C
22%
41%
3.3 m/s
4
42
0
October
29°C
26°C
30°C
19%
47%
4.2 m/s
20
62
5
November
26°C
23°C
27°C
12%
48%
4.0 m/s
52
63
18
December
24°C
20°C
24°C
11%
42%
3.9 m/s
66
49
34
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Key Biscayne weather by season
Year round, Key Biscayne has days of about 23°C at their warmest in January, its coolest month, and 31°C in August, its warmest; the coolest hours of the day run from 18°C to 27°C through the year, and the average temperature over the year is 25°C around the clock. Rain is most likely around June and least likely around March. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Key Biscayne weather in winterDecember to February
High 24°CLow 20°CRain 11%
Winter in Key Biscayne has typical daily highs of about 24°C and lows of about 20°C, with a 11% chance of rain on a given day.
Key Biscayne weather in springMarch to May
High 27°CLow 23°CRain 11%
Spring in Key Biscayne has typical daily highs of about 27°C and lows of about 23°C, with a 11% chance of rain on a given day.
Key Biscayne weather in summerJune to August
High 30°CLow 27°CRain 22%
Summer in Key Biscayne has typical daily highs of about 30°C and lows of about 27°C, with a 22% chance of rain on a given day.
Key Biscayne weather in autumnSeptember to November
High 28°CLow 25°CRain 18%
Autumn in Key Biscayne has typical daily highs of about 28°C and lows of about 25°C, with a 18% chance of rain on a given day.
When is the rainy season in Key Biscayne?
The rainy (wet) season in Key Biscayne runs from June to October, peaking in June with a 23% chance of rain on a given day. The dry season is November to May; March is the driest month, at 7%.
What time of year is Key Biscayne windiest?
Winds in Key Biscayne are highest in April, averaging 4.4 m/s (16 km/h), and lightest in July, at 3.1 m/s (11 km/h). The prevailing wind is from the E.
What is the average temperature in Key Biscayne year round?
The average temperature in Key Biscayne over the whole year is 25°C. August is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 18°C.