Frankfort weather in September: Frankfort, Kentucky: normal highs, lows, rain and records for September
Frankfort in September has a normal high of 81°F and a normal low of 57°F, a daily mean of 69°F, falling from 85°F on the 1st to 76°F by the 30th. Measurable precipitation falls on 9 days in a normal September, 3.35 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 14°C, 85 mm of precipitation in September.
- NOAA stationFrankfort Capital City Airport
- Station IDUSW00053841
- Location38.18°N 84.90°W
- Elevation804 ft (245 m)
- Population28,610
- Jan 43° 25°
- Feb 48° 28°
- Mar 57° 35°
- Apr 69° 45°
- May 77° 54°
- Jun 85° 63°
- Jul 88° 67°
- Aug 87° 65°
- Sep 81° 57°
- Oct 70° 46°
- Nov 57° 36°
- Dec 47° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Frankfort in September?
The normal high is 81°F and the normal low 57°F, for a daily mean of 69.2°F. September is 6.9°F cooler than August and 11.6°F warmer than October. September is the 4th warmest month of the year in Frankfort and the 10th wettest. Across the month the normal high falls 9°F, from 85°F on September 1 to 76°F on September 30. From one year to the next September's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 66°F and 72°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 85°F | 62°F | 33% | 17% |
| September 8 | 84°F | 60°F | 32% | 16% |
| September 15 | 82°F | 58°F | 31% | 16% |
| September 22 | 79°F | 55°F | 32% | 16% |
| September 30 | 76°F | 52°F | 32% | 17% |
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 | 85°F | 62°F | 33% | 17% | 13 h |
| September 2 | 85°F | 62°F | 33% | 16% | 13 h |
| September 3 | 85°F | 62°F | 33% | 16% | 13 h |
| September 4 | 85°F | 61°F | 32% | 16% | 13 h |
| September 5 | 84°F | 61°F | 32% | 16% | 12 h 50 min |
| September 6 | 84°F | 61°F | 32% | 16% | 12 h 50 min |
| September 7 | 84°F | 60°F | 32% | 16% | 12 h 50 min |
| September 8 | 84°F | 60°F | 32% | 16% | 12 h 50 min |
| September 9 | 83°F | 60°F | 32% | 16% | 12 h 40 min |
| September 10 | 83°F | 59°F | 32% | 16% | 12 h 40 min |
| September 11 | 83°F | 59°F | 32% | 16% | 12 h 40 min |
| September 12 | 83°F | 59°F | 32% | 16% | 12 h 40 min |
| September 13 | 82°F | 58°F | 31% | 16% | 12 h 30 min |
| September 14 | 82°F | 58°F | 31% | 16% | 12 h 30 min |
| September 15 | 82°F | 58°F | 31% | 16% | 12 h 30 min |
| September 16 | 81°F | 57°F | 31% | 16% | 12 h 30 min |
| September 17 | 81°F | 57°F | 31% | 16% | 12 h 20 min |
| September 18 | 81°F | 57°F | 31% | 16% | 12 h 20 min |
| September 19 | 80°F | 56°F | 31% | 16% | 12 h 20 min |
| September 20 | 80°F | 56°F | 31% | 16% | 12 h 20 min |
| September 21 | 79°F | 55°F | 32% | 16% | 12 h 10 min |
| September 22 | 79°F | 55°F | 32% | 16% | 12 h 10 min |
| September 23 | 79°F | 55°F | 32% | 16% | 12 h 10 min |
| September 24 | 78°F | 54°F | 32% | 16% | 12 h 10 min |
| September 25 | 78°F | 54°F | 32% | 16% | 12 h 10 min |
| September 26 | 78°F | 53°F | 32% | 16% | 12 h |
| September 27 | 77°F | 53°F | 32% | 16% | 12 h |
| September 28 | 77°F | 53°F | 32% | 16% | 12 h |
| September 29 | 76°F | 52°F | 32% | 17% | 12 h |
| September 30 | 76°F | 52°F | 32% | 17% | 11 h 50 min |
- Normal high
- 81°FSeptember average
- Normal low
- 57°FSeptember average
- Precipitation
- 3.35 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 13 h to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 27
- Days at 80°F or more
- 17
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00053841; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Frankfort in September?
On a given September day the chance of 0.01 inch or more is 32% on average, highest around September 1 (33%). In all, 3.35 in falls on 9 days of a normal September, 1 of them with an inch or more.
In a normal September in Frankfort, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053841.
What are the records for September in Frankfort?
The warmest September temperature on this station's record (since 1996) is 99°F, on September 3, 2011; the coldest is 35°F, on September 24, 2012. The wettest September brought 8.22 in (2006).
The September mean against the 1991-2020 normal of 69.2°F: 2021 70.1°F (+0.9), 2022 68.5°F (−0.7), 2023 69.7°F (+0.5), 2024 71.4°F (+2.2), 2025 69.7°F (+0.5). 4 of 5 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 70.1°F | +0.9°F | 4.37 in |
| 2022 | 68.5°F | −0.7°F | 3.09 in |
| 2023 | 69.7°F | +0.5°F | 1.88 in |
| 2024 | 71.4°F | +2.2°F | 5.86 in |
| 2025 | 69.7°F | +0.5°F | 5.85 in |
Source: records: ACIS, station USW00053841; recent months: ACIS, station USW00053841. Records and recent months use complete months only.
How does September in Frankfort compare across Kentucky?
Across the 68 places PlainClimate covers in Kentucky, September normal highs run from 76°F in Olive Hill to 85°F in Eddyville; Frankfort's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.