St. Augustine, FL weather in September
In September, St. Augustine sees highs around 87°F and lows around 73°F: warm and oppressively humid, with frequent rain. There are about 14 days with rain.
- Normal high
- 87°F
- Normal low
- 73°F
- Wet days
- 14
- 7.2 in total
- Muggy days
- 27
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 89°F | 85°F |
| Normal low | 74°F | 71°F |
| Chance of a wet day | 46% | 41% |
| Sunrise / sunset | 7:02 am / 7:48 pm | 7:18 am / 7:12 pm |
| Daylight | 12.8 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 am75°Fdew point 71°F
- 9 am80°Fdew point 71°F
- Noon85°Fdew point 70°F
- 3 pm86°Fdew point 70°F
- 6 pm82°Fdew point 70°F
- 9 pm79°Fdew point 71°F
NOAA hourly normals (local standard time) from Jacksonville NAS (32 mi away); average wind 8 mph.
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 mph17 of 30
- Hot dayshigh 90°F or more8 of 30
- Muggy daysdaily mean dew point 65°F or more27 of 30
- Wet daysat least 0.01 in of rain or melted snow14 of 30
- Notable rainat least 0.10 in9 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 7.2 in; a dry September brings about 3.4 in and a wet one about 10.0 in (25th and 75th percentiles). About 4 days bring half an inch or more, and about 2 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202010: average high 90°F
- Coolest September2001: average high 83°F
- Wettest September2007: 22.7 in
- Driest September2010: 1.1 in
- Highest reading97°F (September 12, 2010)
- Lowest reading58°F (September 30, 1993)
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 | 90°F | 87°F | 82°F |
| Normal low | 74°F | 73°F | 67°F |
| Wet days | 15 | 14 | 9 |
| Comfortable days | 0 | 0 | 6 |
| Daylight | 13.2 h | 12.3 h | 11.4 h |
Highs change by -3°F from August and -5°F into October.
Nearby alternatives in September
- Drier: Savannah, GA152 mi · high 86°F · 10 wet days
How St. Augustine ranks in September
- Normal high110th warmest of 378 cities; 20th of 23 in Florida
- Wet days354th driest of 378
- Comfortable days309th most of 342
What to pack for St. Augustine in September
- Light, breathable clothing – highs near 87°F and about 27 muggy days
- A rain jacket or umbrella – rain on about 14 days
- A swimsuit – about 17 beach days
Heating and cooling
September has 0 heating degree days and 457 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is St. Augustine in September?
The normal high is 87°F and the normal low is 73°F. From 1991 to 2020 the hottest September reading was 97°F (September 12, 2010).
Does it rain a lot in St. Augustine in September?
About 14 days in September have at least 0.01 in of precipitation, and the normal total is 7.2 in. The wettest September in 1991-2020 was in 2007 (22.7 in); the driest was in 2010 (1.1 in).
Is September a good time to visit St. Augustine?
September ranks 10th of 12 months on our comfort score for St. Augustine (41 out of 100). It has almost no comfortable days and about 8 days at 90°F or hotter. The best months are February, March and November.
Where the numbers come from
- Temperature, rain and frost dates: St Augustine Lighthouse (USC00087826), 1.7 mi ESE of the city center, 12 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Hastings 4NE (USC00083874), 13 mi SW of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Jacksonville NAS (USW00093837), 32 mi NW of the city center, 20 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Jacksonville NAS (722065-93837), 32 mi NW of the city center, 20 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).