Boca Raton, FL weather in September
September in Boca Raton: hot and oppressively humid, with rain on most days. Highs 89°F, lows 75°F, about 17 days with rain. Keep rain gear handy.
- Normal high
- 89°F
- Normal low
- 75°F
- Wet days
- 17
- 8.0 in total
- Muggy days
- 30
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 90°F | 88°F |
| Normal low | 76°F | 75°F |
| Chance of a wet day | 57% | 51% |
| Sunrise / sunset | 7:00 am / 7:40 pm | 7:12 am / 7:08 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 (23 mi away); average wind 8 mph; clear or few clouds in 37% of daytime hours, mostly cloudy or overcast in 40%.
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 mph15 of 30
- Hot dayshigh 90°F or more12 of 30
- Muggy daysdaily mean dew point 65°F or more30 of 30
- Wet daysat least 0.01 in of rain or melted snow17 of 30
- Notable rainat least 0.10 in11 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 8.0 in; a dry September brings about 5.8 in and a wet one about 8.3 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, 1991-20202015: average high 90°F
- Coolest September1994: average high 87°F
- Wettest September2004: 29.4 in
- Driest September2019: 1.4 in
- Highest reading97°F (September 2, 2002)
- Lowest reading68°F (September 24, 2017)
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 | 91°F | 89°F | 86°F |
| Normal low | 76°F | 75°F | 72°F |
| Wet days | 18 | 17 | 12 |
| Comfortable days | 0 | 0 | 1 |
| Daylight | 13.0 h | 12.3 h | 11.5 h |
Highs change by -2°F from August and -3°F into October.
Nearby alternatives in September
- Drier: Tampa, FL183 mi · high 90°F · 13 wet days
How Boca Raton ranks in September
- Normal high68th warmest of 378 cities; 8th of 23 in Florida
- Wet days366th driest of 378
- Comfortable days322nd most of 342
What to pack for Boca Raton in September
- Light, breathable clothing – highs near 89°F and about 30 muggy days
- A rain jacket or umbrella – rain on about 17 days
- A swimsuit – about 15 beach days
Heating and cooling
September has 0 heating degree days and 516 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is Boca Raton in September?
The normal high is 89°F and the normal low is 75°F. From 1991 to 2020 the hottest September reading was 97°F (most recently on September 2, 2002).
Does it rain a lot in Boca Raton in September?
About 17 days in September have at least 0.01 in of precipitation, and the normal total is 8.0 in. The wettest September in 1991-2020 was in 2004 (29.4 in); the driest was in 2019 (1.4 in).
Is September a good time to visit Boca Raton?
September ranks 11th of 12 months on our comfort score for Boca Raton (36 out of 100). It has almost no comfortable days and about 12 days at 90°F or hotter. The best months are January, February and March.
Where the numbers come from
- Temperature, snowfall and snow depth: Ft Lauderdale (USC00083163), 19 mi SSW of the city center, 16 ft . NOAA normals and daily records, 1991-2020.
- Rain and humidity and wind by hour: West Palm Beach Intl Airport (USW00012844), 23 mi N of the city center, 19 ft . NOAA normals and daily records, 1991-2020.
- Frost dates: Ft Lauderdale Beach (USC00083168), 15 mi S of the city center, 4 ft . NOAA normals and daily records, 1991-2020.
- Cloud cover: Miami Kendall Tamiami Exec Airport (USW00012888), 54 mi SSW of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Palm Beach International Airport (722030-12844), 23 mi N of the city center, 11 ft . Hourly observations, 1991-2020.