Jefferson City weather in September

In September, Jefferson City sees average daytime highs of 80°F and overnight lows near 59°F, with 3.5 in of rain across 7.9 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 4th-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 48% 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 36 min by month's end. Set against the rest of the year, September is Jefferson City's 1st-clearest and 10th-windiest month. For the whole year in context, see Jefferson City's year-round climate.

Daytime high
80°
4th warmest
Overnight low
59°
9th coldest
Rainfall
3.5 in
7.9 wet days
Daylight
12 h 12 min
5:56 AM – 6:10 PM
Cloud cover
45%
1st clearest
Wind
6 mph
10th windiest
Solar energy
4.8 kWh/m²
Travel score
6.9
out of 10

Jefferson City is capital city of the U.S. state of Missouri and seat of Cole County.

Density
438/km²
people per km²
Founded
1821

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 Jefferson City reaches about 80°F in the afternoon and slips back to 59°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 90°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18565
28565
38464
48464
58464
68363
78363
88262
98262
108262
118161
128161
138060
148060
158059
167959
177959
187958
197858
207857
217857
227757
237756
247756
257655
267655
277655
287554
297554
307553

How September really feels in Jefferson City

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.

Jefferson City weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan41° / 24°2.47.53.29.60.0
Feb46° / 28°2.47.22.610.51.2
Mar56° / 37°3.410.51.511.73.8
Apr67° / 47°5.011.40.3135.8
May75° / 57°4.913014.16.3
Jun84° / 66°4.212014.65.3
Jul89° / 70°3.410.1014.44.3
Aug87° / 67°3.18.7013.54.9
Sep80° / 59°3.57.9012.36.9
Oct68° / 48°3.28.40.1116.7
Nov55° / 37°3.280.89.93.7
Dec44° / 29°2.47.31.99.40.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 48% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 37%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16436
26436
36436
46337
56436
66436
76337
86337
96436
106337
116337
126238
136238
146139
156238
166139
176139
186139
196139
206139
216238
226337
236436
246436
256535
266634
276634
286733
296733
306733

Chance of precipitation in September

Any precipitation

Jefferson City gets around 3.5 in of rain over 7.9 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 27% and peaks near 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
126
226
326
426
526
626
726
826
926
1026
1127
1227
1328
1428
1529
1629
1729
1829
1929
2029
2129
2228
2328
2427
2526
2625
2724
2824
2923
3023

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 34% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
11017233416
21117243315
31218243214
41319243113
51520252912
61720252811
71821252610
8202125259
9222124248
10242124247
11262123236
12282123236
13292122225
14312121224
15332121214
16352120213
17362119203
18382218202
19402217192
20422216192
21442216181
22462215171
23472114161
24492114151
25512113141
26532113130
27552112120
28562012120
29572012110
30592011100

Wind in September

Winds average 6 mph in September.

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

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
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 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 78 minutes over September. Sunrise moves from 5:42 AM to 6:09 AM, and sunset from 6:35 PM to 5:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:426:35
212.85:436:33
312.85:446:32
412.85:456:30
512.75:466:28
612.75:476:27
712.65:476:25
812.65:486:24
912.55:496:22
1012.55:506:20
1112.55:516:19
1212.45:526:17
1312.45:536:15
1412.35:546:14
1512.35:556:12
1612.25:566:10
1712.25:576:09
1812.25:576:07
1912.15:586:05
2012.15:596:04
2112.06:006:02
2212.06:016:00
2311.96:025:59
2411.96:035:57
2511.96:045:56
2611.86:055:54
2711.86:065:52
2811.76:075:51
2911.76:085:49
3011.66:095:47

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.8 kWh/m².

For context, solar energy here swings from a low near 1.98 kWh/m² to a high of 6.42 kWh/m² in June across the year — September's 4.8 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.2Bright
55.2Bright
65.1Bright
75.1Bright
85.0Bright
95.0Bright
105.0Bright
114.9Bright
124.9Bright
134.8Bright
144.8Bright
154.8Bright
164.7Bright
174.7Bright
184.7Bright
194.6Bright
204.6Bright
214.6Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.4Bright
274.4Bright
284.4Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Jefferson City

In seasonPeak

In September, Jefferson City sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

Jefferson City sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Jefferson City?

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 Jefferson City for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Jefferson City in September

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

In September, Jefferson City sees daytime highs around 80°F and nights near 59°F. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

UV index in Jefferson City in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Jefferson City peaks around June 22 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 22UV 10Jan 1UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Very high
Jul9Very high
Aug9Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Moderate

Air quality in Jefferson City 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 Jefferson City is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (November, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1516 µg/m³Nov 136 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb10Good
Mar11Good
Apr9Good
May12Good
Jun14Moderate
Jul16Moderate
Aug13Moderate
Sep10Good
Oct6Good
Nov6Good
Dec7Good
Location & terrain

Where is Jefferson City?

Jefferson City sits at 38.6°N, 92.2°W, 630 ft above sea level, in United States. The nearest listed city is Columbia, 27 mi away.

Topography around Jefferson City

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

Within 2 miles, the terrain around Jefferson City has only modest variations in elevation — a maximum elevation change of 299 ft around an average of 610 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 367 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 768 ft.

The land around Jefferson City is covered by trees (33%) and artificial surfaces (28%) within 2 miles, trees (53%) and grassland (28%) within 10 miles, and trees (55%) and grassland (26%) within 50 miles.

2 miles
299 ft
10 miles
367 ft
50 miles
768 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Columbia 27 mi · Rolla 48 mi · Sedalia 58 mi · Fort Leonard Wood 60 mi · Wentzville 73 mi · O'Fallon 81 mi · Wildwood 81 mi · Saint Peters 85 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 Jefferson City (38.5767°, -92.1735°, elevation 630 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).