St. Petersburg weather in September: St. Petersburg, Florida: normal highs, lows, rain and records for September
St. Petersburg in September has a normal high of 89°F and a normal low of 75°F, a daily mean of 82°F, falling from 90°F on the 1st to 87°F by the 30th. Measurable precipitation falls on 13 days in a normal September, 6.40 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 24°C, 163 mm of precipitation in September.
- NOAA stationSt Petersburg International Airport
- Station IDUSW00012873
- Location27.91°N 82.69°W
- Elevation11 ft (3 m)
- From the center11 miles
- Population267,102
- Jan 71° 53°
- Feb 73° 55°
- Mar 77° 59°
- Apr 82° 64°
- May 87° 70°
- Jun 90° 75°
- Jul 90° 76°
- Aug 91° 76°
- Sep 89° 75°
- Oct 84° 70°
- Nov 77° 61°
- Dec 73° 56°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Petersburg in September?
The normal high is 89°F and the normal low 75°F, for a daily mean of 82.1°F. September is 1.4°F cooler than August and 5.2°F warmer than October. September is the 3rd warmest month of the year in St. Petersburg and the 4th wettest. Across the month the normal high falls 3°F, from 90°F on September 1 to 87°F on September 30. From one year to the next September's mean temperature typically moves about 1.2°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 81°F and 83°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 51%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 90°F | 76°F | 51% | 36% |
| September 8 | 90°F | 76°F | 48% | 33% |
| September 15 | 89°F | 75°F | 44% | 29% |
| September 22 | 88°F | 75°F | 39% | 24% |
| September 30 | 87°F | 74°F | 33% | 20% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 90°F | 76°F | 51% | 36% | 12 h 40 min |
| September 2 | 90°F | 76°F | 51% | 35% | 12 h 40 min |
| September 3 | 90°F | 76°F | 50% | 35% | 12 h 40 min |
| September 4 | 90°F | 76°F | 50% | 35% | 12 h 40 min |
| September 5 | 90°F | 76°F | 49% | 34% | 12 h 40 min |
| September 6 | 90°F | 76°F | 49% | 34% | 12 h 40 min |
| September 7 | 90°F | 76°F | 48% | 33% | 12 h 30 min |
| September 8 | 90°F | 76°F | 48% | 33% | 12 h 30 min |
| September 9 | 90°F | 76°F | 47% | 32% | 12 h 30 min |
| September 10 | 89°F | 76°F | 47% | 31% | 12 h 30 min |
| September 11 | 89°F | 76°F | 46% | 31% | 12 h 30 min |
| September 12 | 89°F | 76°F | 46% | 30% | 12 h 30 min |
| September 13 | 89°F | 76°F | 45% | 30% | 12 h 30 min |
| September 14 | 89°F | 76°F | 44% | 29% | 12 h 20 min |
| September 15 | 89°F | 75°F | 44% | 29% | 12 h 20 min |
| September 16 | 89°F | 75°F | 43% | 28% | 12 h 20 min |
| September 17 | 89°F | 75°F | 42% | 27% | 12 h 20 min |
| September 18 | 89°F | 75°F | 42% | 27% | 12 h 20 min |
| September 19 | 89°F | 75°F | 41% | 26% | 12 h 20 min |
| September 20 | 89°F | 75°F | 40% | 26% | 12 h 10 min |
| September 21 | 89°F | 75°F | 39% | 25% | 12 h 10 min |
| September 22 | 88°F | 75°F | 39% | 24% | 12 h 10 min |
| September 23 | 88°F | 75°F | 38% | 24% | 12 h 10 min |
| September 24 | 88°F | 75°F | 37% | 23% | 12 h 10 min |
| September 25 | 88°F | 75°F | 37% | 23% | 12 h 10 min |
| September 26 | 88°F | 74°F | 36% | 22% | 12 h |
| September 27 | 88°F | 74°F | 35% | 21% | 12 h |
| September 28 | 88°F | 74°F | 34% | 21% | 12 h |
| September 29 | 88°F | 74°F | 33% | 20% | 12 h |
| September 30 | 87°F | 74°F | 33% | 20% | 12 h |
- Normal high
- 89°FSeptember average
- Normal low
- 75°FSeptember average
- Precipitation
- 6.40 inmonth total
- Days with precipitation
- 130.01 inch or more
- Days at 90°F or more
- 17
- Daylight
- 12 h 40 min to 12 hSeptember 1 to September 30
- Days at 70°F or more
- 30
- Days at 80°F or more
- 30
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012873; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. Petersburg in September?
On a given September day the chance of 0.01 inch or more is 43% on average, highest around September 1 (51%). In all, 6.40 in falls on 13 days of a normal September, 2 of them with an inch or more.
In a normal September in St. Petersburg, 17 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012873.
How humid and windy is St. Petersburg in September?
At 3 p.m. the normal temperature is 85°F with 61% relative humidity and a dew point of 71°F; at 6 a.m. it is 75°F with 88% humidity. The wind averages 8.6 mph, most often from the north-northeast in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 75°F | 71°F | 88% | 7.1 mph | 72% |
| 9 a.m. | 79°F | 72°F | 78% | 8.7 mph | 63% |
| noon | 85°F | 71°F | 64% | 9.4 mph | 51% |
| 3 p.m. | 85°F | 71°F | 61% | 9.3 mph | 51% |
| 6 p.m. | 81°F | 71°F | 71% | 9.5 mph | 63% |
| 9 p.m. | 78°F | 71°F | 79% | 8.7 mph | 66% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00012873. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in St. Petersburg?
The warmest September temperature on this station's record (since 1998) is 97°F, on September 4, 2020; the coldest is 64°F, on September 30, 2001. The wettest September brought 12.71 in (2022).
The September mean against the 1991-2020 normal of 82.1°F: 2021 82.1°F (at normal), 2022 80.3°F (−1.8), 2023 83.0°F (+0.9), 2025 82.9°F (+0.8), 2026 82.4°F (+0.3). 3 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 82.1°F | at normal | 7.63 in |
| 2022 | 80.3°F | −1.8°F | 12.71 in |
| 2023 | 83.0°F | +0.9°F | 3.75 in |
| 2025 | 82.9°F | +0.8°F | 1.10 in |
| 2026 | 82.4°F | +0.3°F | 5.62 in |
Source: records: ACIS, station USW00012873; recent months: ACIS, station USW00012873. Records and recent months use complete months only.
How does September in St. Petersburg compare across Florida?
Across the 106 places PlainClimate covers in Florida, September normal highs run from 86°F in Jacksonville Beach to 92°F in Plant City; St. Petersburg's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- St. Petersburg in August91°F by day, 76°F at night
- St. Petersburg in October84°F by day, 70°F at night
- St. Petersburg through the yearEvery month, frost dates, records and recent years
- Florida in SeptemberThe statewide normal and the warmest and coolest places
- Plant City: Florida's warmest Septembernormal high 92°F