Frankfort weather in September

In September, Frankfort sees average daytime highs of 79°F and overnight lows near 60°F, with 3.2 in of rain across 8.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 83°F in the first days to 75°F by the end. The sky is clear or mostly clear about 43% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Frankfort's 1st-clearest and 9th-windiest month. For the whole year in context, see Frankfort's year-round climate.

Daytime high
79°
4th warmest
Overnight low
60°
9th coldest
Rainfall
3.2 in
8.4 wet days
Daylight
12 h 12 min
6:27 AM – 6:41 PM
Cloud cover
50%
1st clearest
Wind
5 mph
9th windiest
Solar energy
4.59 kWh/m²
Travel score
6.9
out of 10

Frankfort is capital city of the U.S. state of Kentucky and seat of Franklin County.

Density
750/km²
people per km²
Founded
1786

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 83°F in the first days to 75°F by the end.

A typical September day in Frankfort reaches about 79°F in the afternoon and slips back to 60°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 88°F. Set against its neighbours, September runs about 6°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18465
28365
38364
48364
58364
68263
78263
88262
98162
108162
118161
128061
138060
148060
157960
167959
177959
187859
197858
207858
217757
227757
237657
247656
257656
267555
277555
287555
297454
307454

How September really feels in Frankfort

Once humidity and wind are folded in, September averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Frankfort weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan42° / 27°3.510.33.49.60.1
Feb46° / 30°3.5103.310.51.1
Mar55° / 37°4.511.81.611.73.4
Apr66° / 47°5.012.60.3135.6
May74° / 57°4.813.60146.2
Jun83° / 65°4.212.7014.65.5
Jul86° / 69°4.012.1014.44.8
Aug85° / 67°3.010.1013.55.3
Sep79° / 60°3.28.4012.36.9
Oct67° / 48°3.48.40.1116.4
Nov54° / 38°3.48.90.69.93.5
Dec45° / 31°4.110.82.49.41.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 42%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25842
35842
45842
55842
65842
75842
85842
95941
105941
115842
125842
135842
145743
155743
165842
175743
185743
195743
205842
215842
225842
235842
245941
255941
265941
276040
286040
296040
306040

Chance of precipitation in September

Any precipitation

Frankfort gets around 3.2 in of rain over 8.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 28% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
130
230
330
430
529
628
728
827
926
1026
1126
1226
1326
1426
1526
1627
1727
1828
1928
2028
2129
2229
2329
2429
2529
2629
2728
2828
2927
3026

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the dry band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 23% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11221213313
21222213212
31323223111
41423223010
5162422299
6172422288
7192423278
8202523257
9222523246
10242424235
11262424225
12272324214
13292324204
14312324193
15332224183
16352223173
17372123172
18392122162
19412122152
20432021141
21452020131
22481919131
23491918121
24521917111
25531916111
26541916101
27551915101
2857191491
2959181481
3060181381

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over September. Sunrise moves from 6:13 AM to 6:39 AM, and sunset from 7:05 PM to 6:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:137:05
212.86:147:04
312.86:157:02
412.76:167:01
512.76:176:59
612.76:186:57
712.66:196:56
812.66:196:54
912.56:206:53
1012.56:216:51
1112.56:226:49
1212.46:236:48
1312.46:246:46
1412.36:256:44
1512.36:266:43
1612.26:276:41
1712.26:276:39
1812.26:286:38
1912.16:296:36
2012.16:306:35
2112.06:316:33
2212.06:326:31
2311.96:336:30
2411.96:346:28
2511.96:356:26
2611.86:366:25
2711.86:366:23
2811.76:376:22
2911.76:386:20
3011.76:396:18

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.59 kWh/m².

For context, solar energy here swings from a low near 1.77 kWh/m² to a high of 6.16 kWh/m² in June across the year — September's 4.59 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.2Bright
274.2Bright
284.2Bright
294.1Bright
304.1Bright
Planning a trip in September

Is September a good time to visit Frankfort?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.9
Sightseeing
1st-best month of the year
6.7
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Frankfort for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Frankfort in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Frankfort sees daytime highs around 79°F and nights near 60°F. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Frankfort in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Frankfort peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 22UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5High
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Frankfort in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Frankfort is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Dec 107 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar11Good
Apr11Good
May14Moderate
Jun17Moderate
Jul19Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec7Good
Location & terrain

Where is Frankfort?

Frankfort sits at 38.2°N, 84.9°W, 509 ft above sea level, in United States. The nearest listed city is Georgetown, 17 mi away.

Topography around Frankfort

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Frankfort.

Within 2 miles, the terrain around Frankfort has only modest variations in elevation — a maximum elevation change of 407 ft around an average of 659 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 512 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,132 ft.

The land around Frankfort is covered by trees (55%) and grassland (23%) within 2 miles, trees (49%) and grassland (42%) within 10 miles, and trees (47%) and grassland (39%) within 50 miles.

2 miles
407 ft
10 miles
512 ft
50 miles
1,132 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Georgetown 17 mi · Shelbyville 19 mi · Lexington-Fayette 25 mi · Lexington 26 mi · Nicholasville 27 mi · Jeffersontown 37 mi · Danville 39 mi · Fern Creek 39 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Frankfort (38.2009°, -84.8733°, elevation 509 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).