Key Largo, FL weather in August
August in Key Largo: hot and oppressively humid, with rain on most days. Highs 93°F, lows 74°F, about 19 days with rain. This is the peak of the warm season in Key Largo. Midday heat is the main thing to plan around.
- Normal high
- 93°F
- Normal low
- 74°F
- Wet days
- 19
- 8.6 in total
- Muggy days
- 31
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 93°F | 92°F |
| Normal low | 74°F | 75°F |
| Chance of a wet day | 58% | 62% |
| Sunrise / sunset | 6:49 am / 8:06 pm | 7:02 am / 7:41 pm |
| Daylight | 13.3 h | 12.7 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 August day
- 6 am78°Fdew point 75°F
- 9 am85°Fdew point 76°F
- Noon88°Fdew point 76°F
- 3 pm87°Fdew point 75°F
- 6 pm84°Fdew point 75°F
- 9 pm81°Fdew point 75°F
NOAA hourly normals (local standard time) from Homestead AFB (28 mi away); average wind 6 mph; clear or few clouds in 41% of daytime hours, mostly cloudy or overcast in 38%.
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 mph10 of 31
- Hot dayshigh 90°F or more26 of 31
- Muggy daysdaily mean dew point 65°F or more31 of 31
- Wet daysat least 0.01 in of rain or melted snow19 of 31
- Notable rainat least 0.10 in12 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 8.6 in; a dry August brings about 6.2 in and a wet one about 10.7 in (25th and 75th percentiles). About 5 days bring half an inch or more, and about 3 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202007: average high 97°F
- Coolest August1991: average high 86°F
- Wettest August2011: 18.3 in
- Driest August2020: 1.9 in
- Highest reading103°F (August 8, 2015)
- Lowest reading68°F (August 15, 2000)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 93°F | 93°F | 91°F |
| Normal low | 74°F | 74°F | 74°F |
| Wet days | 17 | 19 | 18 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 13.5 h | 13.0 h | 12.3 h |
Highs change by 0°F from July and -2°F into September.
Nearby alternatives in August
- Drier: Key West, FL91 mi · high 91°F · 15 wet days
How Key Largo ranks in August
- Normal high82nd warmest of 378 cities; 2nd of 23 in Florida
- Wet days372nd driest of 378
- Comfortable days278th most of 341
What to pack for Key Largo in August
- Light, breathable clothing – highs near 93°F and about 31 muggy days
- A rain jacket or umbrella – rain on about 19 days
Heating and cooling
August has 0 heating degree days and 572 cooling degree days (base 65°F), 13% of the year's total heating and cooling demand.
Questions
How hot is Key Largo in August?
The normal high is 93°F and the normal low is 74°F. From 1991 to 2020 the hottest August reading was 103°F (most recently on August 8, 2015).
Does it rain a lot in Key Largo in August?
About 19 days in August have at least 0.01 in of precipitation, and the normal total is 8.6 in. The wettest August in 1991-2020 was in 2011 (18.3 in); the driest was in 2020 (1.9 in).
Is August a good time to visit Key Largo?
August ranks 11th of 12 months on our comfort score for Key Largo (29 out of 100). It has almost no comfortable days and about 26 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.