Port St. Lucie, FL weather in September
September in Port St. Lucie: hot and oppressively humid, with rain on most days. Highs 88°F, lows 74°F, about 15 days with rain. Keep rain gear handy.
- Normal high
- 88°F
- Normal low
- 74°F
- Wet days
- 15
- 8.2 in total
- Muggy days
- 30
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 89°F | 86°F |
| Normal low | 75°F | 73°F |
| Chance of a wet day | 50% | 48% |
| Sunrise / sunset | 7:00 am / 7:42 pm | 7:13 am / 7:09 pm |
| Daylight | 12.7 h | 11.9 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 September day
- 6 am78°Fdew point 73°F
- 9 am84°Fdew point 74°F
- Noon86°Fdew point 73°F
- 3 pm85°Fdew point 73°F
- 6 pm82°Fdew point 73°F
- 9 pm81°Fdew point 73°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 33% of daytime hours, mostly cloudy or overcast in 35%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 30
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph16 of 30
- Hot dayshigh 90°F or more10 of 30
- Muggy daysdaily mean dew point 65°F or more30 of 30
- Wet daysat least 0.01 in of rain or melted snow15 of 30
- Notable rainat least 0.10 in10 of 30
- Freezing nightslow 32°F or below0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 8.2 in; a dry September brings about 4.9 in and a wet one about 9.7 in (25th and 75th percentiles). About 5 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20201993: average high 91°F
- Coolest September2001: average high 87°F
- Wettest September2017: 25.7 in
- Driest September2006: 2.7 in
- Highest reading99°F (September 1, 1998)
- Lowest reading59°F (September 29, 1998)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 89°F | 88°F | 84°F |
| Normal low | 75°F | 74°F | 70°F |
| Wet days | 15 | 15 | 12 |
| Comfortable days | 0 | 0 | 1 |
| Daylight | 13.1 h | 12.3 h | 11.5 h |
Highs change by -1°F from August and -4°F into October.
Nearby alternatives in September
- Drier: Gainesville, FL202 mi · high 88°F · 11 wet days
How Port St. Lucie ranks in September
- Normal high109th warmest of 378 cities; 19th of 23 in Florida
- Wet days361st driest of 378
- Comfortable days333rd most of 342
What to pack for Port St. Lucie in September
- Light, breathable clothing – highs near 88°F and about 30 muggy days
- A rain jacket or umbrella – rain on about 15 days
- A swimsuit – about 16 beach days
Heating and cooling
September has 0 heating degree days and 473 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is Port St. Lucie in September?
The normal high is 88°F and the normal low is 74°F. From 1991 to 2020 the hottest September reading was 99°F (September 1, 1998).
Does it rain a lot in Port St. Lucie in September?
About 15 days in September have at least 0.01 in of precipitation, and the normal total is 8.2 in. The wettest September in 1991-2020 was in 2017 (25.7 in); the driest was in 2006 (2.7 in).
Is September a good time to visit Port St. Lucie?
September ranks 10th of 12 months on our comfort score for Port St. Lucie (38 out of 100). It has almost no comfortable days and about 10 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.