Port St. Lucie, FL weather in August
Expect hot, oppressively humid weather with frequent rain in Port St. Lucie in August, with highs near 89°F and lows near 75°F. Rain falls on about 15 days. It is one of the warmest months in Port St. Lucie. Plan outdoor time for mornings and evenings.
- Normal high
- 89°F
- Normal low
- 75°F
- Wet days
- 15
- 7.3 in total
- Muggy days
- 31
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 90°F | 89°F |
| Normal low | 74°F | 75°F |
| Chance of a wet day | 45% | 49% |
| Sunrise / sunset | 6:45 am / 8:10 pm | 7:00 am / 7:43 pm |
| Daylight | 13.4 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 74°F
- 9 am85°Fdew point 75°F
- Noon88°Fdew point 74°F
- 3 pm87°Fdew point 74°F
- 6 pm84°Fdew point 74°F
- 9 pm81°Fdew point 74°F
NOAA hourly normals (local standard time) from West Palm Beach Intl Airport (45 mi away); average wind 8 mph; clear or few clouds in 37% of daytime hours, mostly cloudy or overcast in 30%.
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 more20 of 31
- Muggy daysdaily mean dew point 65°F or more31 of 31
- Wet daysat least 0.01 in of rain or melted snow15 of 31
- Notable rainat least 0.10 in11 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 7.3 in; a dry August brings about 4.4 in and a wet one about 9.2 in (25th and 75th percentiles). About 5 days bring half an inch or more, and about 2 an inch or more.
How August varies from year to year
- Warmest August, 1991-20201998: average high 93°F
- Coolest August2010: average high 88°F
- Wettest August1995: 17.7 in
- Driest August1996: 3.4 in
- Highest reading98°F (August 26, 1998)
- Lowest reading61°F (August 28, 1997)
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 | 89°F | 89°F | 88°F |
| Normal low | 74°F | 75°F | 74°F |
| Wet days | 13 | 15 | 15 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 13.7 h | 13.1 h | 12.3 h |
Highs change by 0°F from July and -1°F into September.
How Port St. Lucie ranks in August
- Normal high144th warmest of 378 cities; 22nd of 23 in Florida
- Wet days351st driest of 378
- Comfortable days286th most of 341
What to pack for Port St. Lucie in August
- Light, breathable clothing – highs near 89°F and about 31 muggy days
- A rain jacket or umbrella – rain on about 15 days
- A swimsuit – about 17 beach days
Heating and cooling
August has 0 heating degree days and 524 cooling degree days (base 65°F), 13% of the year's total heating and cooling demand.
Questions
How hot is Port St. Lucie in August?
The normal high is 89°F and the normal low is 75°F. From 1991 to 2020 the hottest August reading was 98°F (most recently on August 26, 1998).
Does it rain a lot in Port St. Lucie in August?
About 15 days in August have at least 0.01 in of precipitation, and the normal total is 7.3 in. The wettest August in 1991-2020 was in 1995 (17.7 in); the driest was in 1996 (3.4 in).
Is August a good time to visit Port St. Lucie?
August ranks 12th of 12 months on our comfort score for Port St. Lucie (33 out of 100). It has almost no comfortable days and about 20 days at 90°F or hotter. The best months are January, February and March.
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Ft Pierce (USC00083207), 10 mi N of the city center, 25 ft . NOAA normals and daily records, 1991-2020.
- Frost dates: Stuart (USC00088620), 9.9 mi SE of the city center, 13 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: West Palm Beach Intl Airport (USW00012844), 45 mi SSE of the city center, 19 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Melbourne Intl Airport (USW00012838), 58 mi NNW of the city center, 22 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Palm Beach International Airport (722030-12844), 45 mi SSE of the city center, 11 ft . Hourly observations, 1991-2020.