Weather in Monroe County

Calculated from weather data of Key West International Airport (KEYW) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	75.0	76.0	77.0	75.0	73.0	77.0
February	79.0	75.0	81.0	77.0	79.0	79.0
March	80.0	81.0	81.0	80.0	80.0	81.0
April	83.0		83.0	82.0	83.0	84.0
May	85.0		86.0	85.0	84.0	85.0
June	87.0		89.0	87.0	86.0	88.0
July	90.0		91.0	89.0	88.0	90.0
August	89.0		91.0	89.0	88.0	91.0
September	88.0		90.0	88.0	87.0	89.0
October	86.0		86.0	84.0	85.0	86.0
November	81.0		81.0	82.0	78.0	81.0
December	78.0		77.0	80.0	79.0	75.0
Average	83.0	77.0	85.0	83.0	83.0	84.0

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	64.0	49	66	65	64	69
February	66.0	58	60	64	68	71
March	70.0	63	74	73	72	73
April	73.0		76	62	75	77
May	75.0		78	76	71	72
June	80.0		82	79	77	82
July	81.0		84	80	80	82
August	80.0		84	82	82	84
September	80.0		81	79	80	82
October	76.0		78	76	71	72
November	71.0		71	76	59	74
December	65.0		46	73	70	66
Average	72.0	57.0	73.0	74.0	72.0	75.0

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days	2024	2023	2022	2021	2020
86 °F or warmer	0	140	109	98	145
77 °F or warmer	51	329	309	302	318
68 °F or warmer	90	363	350	358	361
32 °F or colder	0	0	1	0	0

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	2.0	2	1	4	1	2
February	3.5	8	1	5	3	3
March	0.9	3	0	0	0	1
April	1.9		3	2	1	0
May	3.7		3	3	2	6
June	3.7		2	11	3	3
July	2.6		1	2	4	6
August	2.8		3	3	5	2
September	5.8		6	9	6	4
October	4.6		4	5	4	8
November	3.5		5	3	4	8
December	4.9		14	2	3	3
Average	3.3	3.8	3.3	4.1	2.9	3.7

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (miles per hour)

Month	Average	2024	2023	2022	2021	2020
January	11.1	11	11	11	10	12
February	11.0	11	10	12	11	12
March	11.7	11	11	13	12	13
April	11.5		11	12	12	11
May	10.5		8	10	11	11
June	8.9		8	8	11	10
July	9.0		7	11	10	10
August	9.4		10	10	11	10
September	8.9		8	10	7	10
October	10.9		10	10	10	12
November	10.6		11	10	10	13
December	10.5		12	9	10	11
Average	10.4	11.1	9.5	10.4	10.4	10.8

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2024	2023	2022	2021	2020
January	NE	NE	N	NE	NE
February	NE	E	NE	E	E
March	SE	E	E	E	E
April		SE	E	E	SE
May		E	E	E	E
June		S	SE	SE	SE
July		SE	SE	SE	SE
August		SE	SE	SE	SE
September		E	SE	SE	SE
October		NE	NE	E	E
November		NE	NE	NE	E
December		NE	NE	E	NE

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.

Monroe County weather Q&A

What is the warmest month in Monroe County?

The warmest month is July with an average temperature of 90 °F over the past years.

What is the coldest month in Monroe County?

The coldest month is January with an average daytime temperature of 75 °F in the past few years.

Which month is the wettest in Monroe County?

Chance of precipitation is the highest in September with a probability of around 5.8 %.

Which month is the driest in Monroe County?

The least rainfall and snow can be expected in March. The probability is about 1.0 %.