Key Largo, FL weather in May
Expect hot, oppressively humid weather with frequent rain in Key Largo in May, with highs near 89°F and lows near 67°F. Rain falls on about 11 days.
- Normal high
- 89°F
- Normal low
- 67°F
- Wet days
- 11
- 5.8 in total
- Muggy days
- 27
- dew point 65°F+
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 88°F | 90°F |
| Normal low | 64°F | 70°F |
| Chance of a wet day | 28% | 46% |
| Sunrise / sunset | 6:45 am / 7:51 pm | 6:31 am / 8:07 pm |
| Daylight | 13.1 h | 13.6 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical May day
- 6 am73°Fdew point 69°F
- 9 am81°Fdew point 70°F
- Noon84°Fdew point 70°F
- 3 pm83°Fdew point 70°F
- 6 pm81°Fdew point 70°F
- 9 pm77°Fdew point 70°F
NOAA hourly normals (local standard time) from Homestead AFB (28 mi away); average wind 8 mph; clear or few clouds in 48% of daytime hours, mostly cloudy or overcast in 31%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph17 of 31
- Hot dayshigh 90°F or more15 of 31
- Muggy daysdaily mean dew point 65°F or more27 of 31
- Wet daysat least 0.01 in of rain or melted snow11 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 5.8 in; a dry May brings about 2.6 in and a wet one about 7.8 in (25th and 75th percentiles). About 4 days bring half an inch or more, and about 2 an inch or more.
How May varies from year to year
- Warmest May, 1991-20202008: average high 96°F
- Coolest May1992: average high 82°F
- Wettest May2013: 16.0 in
- Driest May1992: 0.8 in
- Highest reading107°F (May 9, 2011)
- Lowest reading51°F (May 8, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 86°F | 89°F | 91°F |
| Normal low | 62°F | 67°F | 72°F |
| Wet days | 6 | 11 | 17 |
| Comfortable days | 1 | 0 | 0 |
| Daylight | 12.8 h | 13.4 h | 13.7 h |
Highs change by +3°F from April and +2°F into June.
Nearby alternatives in May
- Drier: Key West, FL91 mi · high 86°F · 8 wet days
- Cooler: Port St. Lucie, FL153 mi · high 84°F · 9 wet days
How Key Largo ranks in May
- Normal high18th warmest of 378 cities; 3rd of 23 in Florida
- Wet days221st driest of 378
- Comfortable days336th most of 339
What to pack for Key Largo in May
- Light, breathable clothing – highs near 89°F and about 27 muggy days
- A rain jacket or umbrella – rain on about 11 days
- A swimsuit – about 17 beach days
Heating and cooling
May has 0 heating degree days and 403 cooling degree days (base 65°F), 9% of the year's total heating and cooling demand.
Questions
How hot is Key Largo in May?
The normal high is 89°F and the normal low is 67°F. From 1991 to 2020 the hottest May reading was 107°F (May 9, 2011).
Does it rain a lot in Key Largo in May?
About 11 days in May have at least 0.01 in of precipitation, and the normal total is 5.8 in. The wettest May in 1991-2020 was in 2013 (16.0 in); the driest was in 1992 (0.8 in).
Is May a good time to visit Key Largo?
May ranks 7th of 12 months on our comfort score for Key Largo (41 out of 100). It has almost no comfortable days and about 15 days at 90°F or hotter. The best months are January, February and March.
Where the numbers come from
- Temperature, rain and snow depth: Royal Palm RS (USC00087760), 23 mi NNW of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and frost dates: Tavernier (USC00088841), 7.2 mi SW of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Homestead AFB (USW00012826), 28 mi N of the city center, 16 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Homestead AFB Airport (722026-12826), 28 mi N of the city center, 5 ft . Hourly observations, 1991-2020.