Saint Matthews weather in September

In September, Saint Matthews sees average daytime highs of 80°F and overnight lows near 60°F, with 3.0 in of rain across 7.7 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 84°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 Saint Matthews's 1st-clearest and 9th-windiest month. For the whole year in context, see Saint Matthews's year-round climate.

Daytime high
80°
4th warmest
Overnight low
60°
9th coldest
Rainfall
3.0 in
7.7 wet days
Daylight
12 h 12 min
6:30 AM – 6:44 PM
Cloud cover
49%
1st clearest
Wind
5 mph
9th windiest
Solar energy
4.63 kWh/m²
Travel score
6.9
out of 10

Saint Matthews is city in Jefferson County, Kentucky, United States.

Density
1,561/km²
people per km²
Founded
1950

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 84°F in the first days to 75°F by the end.

A typical September day in Saint Matthews reaches about 80°F in the afternoon and slips back to 60°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 70°F and 89°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
28465
38465
48464
58364
68364
78363
88263
98263
108262
118262
128161
138161
148061
158060
168060
177959
187959
197959
207858
217858
227857
237757
247756
257656
267656
277655
287555
297555
307554

How September really feels in Saint Matthews

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.

Saint Matthews 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
Jan41° / 27°3.69.72.69.60.1
Feb46° / 29°3.39.22.610.51.1
Mar55° / 38°4.511.41.311.73.5
Apr67° / 48°5.0120.1135.7
May75° / 58°5.012.80146.3
Jun83° / 66°4.011.8014.65.5
Jul87° / 69°4.011.9014.44.7
Aug85° / 67°2.89.1013.55.3
Sep80° / 60°3.07.7012.36.9
Oct68° / 48°3.38.10116.6
Nov55° / 38°3.59.30.69.93.6
Dec45° / 31°4.010.12.29.41.0

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 17% of September, with mostly cloudy or overcast conditions the remaining 40%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16040
26139
36139
46139
56238
66238
76139
86139
96139
106139
116040
126040
136040
146040
155941
165842
175941
185941
195941
205941
215941
225941
236040
246040
256040
266139
276139
286139
296238
306238

Chance of precipitation in September

Any precipitation

Saint Matthews gets around 3.0 in of rain over 7.7 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 26% and peaks near 27% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
127
227
327
426
526
625
725
824
924
1024
1124
1224
1324
1424
1524
1625
1725
1826
1926
2027
2127
2227
2327
2427
2527
2626
2726
2825
2925
3024

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 33% of days. Sticky, muggy-or-worse air turns up on roughly 25% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11117242919
21118242918
31219242816
41320242815
51520252714
61621252612
71822252511
81922252510
9212225248
10222225237
11242225227
12262225216
13272225215
14292224205
15312124194
16332124184
17352123184
18372022173
19392022163
20412021153
21432020153
22451919142
23471918132
24491918122
25511917112
26521916112
27541915102
2855191592
2957191482
3058191382

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
195calm
205calm
215calm
225calm
235calm
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 6:16 AM to 6:42 AM, and sunset from 7:08 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:167:08
212.86:177:07
312.86:187:05
412.76:197:04
512.76:207:02
612.76:217:01
712.66:226:59
812.66:226:57
912.56:236:56
1012.56:246:54
1112.56:256:52
1212.46:266:51
1312.46:276:49
1412.36:286:48
1512.36:296:46
1612.26:306:44
1712.26:316:43
1812.26:316:41
1912.16:326:39
2012.16:336:38
2112.06:346:36
2212.06:356:34
2311.96:366:33
2411.96:376:31
2511.96:386:30
2611.86:396:28
2711.86:406:26
2811.76:416:25
2911.76:416:23
3011.76:426:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.63 kWh/m².

For context, solar energy here swings from a low near 1.78 kWh/m² to a high of 6.2 kWh/m² in June across the year — September's 4.63 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.9Bright
104.8Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.7Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.4Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.2Bright
304.1Bright
Planning a trip in September

Is September a good time to visit Saint Matthews?

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
6.9
Beach & pool
2nd-best month of the year

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

What to pack for Saint Matthews in September

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

In September, Saint Matthews sees daytime highs around 80°F and nights near 60°F. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

UV index in Saint Matthews 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 Saint Matthews peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 23UV 9Dec 22UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr6High
May7Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Saint Matthews 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 Saint Matthews is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (December, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1418 µg/m³Dec 118 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar11Good
Apr11Good
May15Moderate
Jun17Moderate
Jul19Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Saint Matthews?

Saint Matthews sits at 38.3°N, 85.7°W, 551 ft above sea level, in United States. The nearest listed city is Jeffersonville, 5.0 mi away.

Topography around Saint Matthews

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

Within 2 miles, the terrain around Saint Matthews has only modest variations in elevation — a maximum elevation change of 154 ft around an average of 541 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 505 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 866 ft.

The land around Saint Matthews is covered by trees (59%) and artificial surfaces (26%) within 2 miles, trees (45%), artificial surfaces (29%) and grassland (20%) within 10 miles, and trees (56%) and grassland (23%) within 50 miles.

2 miles
154 ft
10 miles
505 ft
50 miles
866 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Jeffersonville 5.0 mi · Louisville 5.6 mi · Jeffersontown 6.2 mi · Clarksville 6.2 mi · Newburg 6.2 mi · Fern Creek 7.5 mi · Highview 8.1 mi · Okolona 8.1 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 Saint Matthews (38.2529°, -85.6558°, elevation 551 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).