Saint Joseph weather in September

In September, Saint Joseph sees average daytime highs of 78°F and overnight lows near 58°F, with 3.3 in of rain across 8.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 82°F in the first days to 73°F by the end. The sky is clear or mostly clear about 50% 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 Saint Joseph's 1st-clearest and 10th-windiest month. For the whole year in context, see Saint Joseph's year-round climate.

Daytime high
78°
4th warmest
Overnight low
58°
9th coldest
Rainfall
3.3 in
8.2 wet days
Daylight
12 h 18 min
6:06 AM – 6:21 PM
Cloud cover
43%
1st clearest
Wind
8 mph
10th windiest
Solar energy
4.84 kWh/m²
Travel score
7.2
out of 10

Saint Joseph is city and seat of Buchanan County, State of Missouri, United States.

Density
662/km²
people per km²
Founded
1843

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 82°F in the first days to 73°F by the end.

A typical September day in Saint Joseph reaches about 78°F in the afternoon and slips back to 58°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 67°F and 88°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)
18364
28364
38263
48263
58262
68162
78162
88061
98061
108060
117960
127959
137859
147859
157858
167758
177757
187757
197656
207656
217656
227555
237555
247555
257454
267454
277453
287353
297352
307352

How September really feels in Saint Joseph

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 Joseph weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 20°1.25.43.69.50.0
Feb41° / 23°1.76.13.110.40.3
Mar53° / 33°3.091.911.73.1
Apr64° / 44°4.511.10.6135.5
May74° / 55°5.612.50.114.26.4
Jun83° / 65°4.511.1014.85.7
Jul87° / 69°4.49.1014.55.0
Aug85° / 67°3.69013.65.5
Sep78° / 58°3.38.2012.37.2
Oct65° / 46°3.27.90.210.96.4
Nov52° / 34°2.16.51.19.83.0
Dec40° / 24°1.85.42.69.20.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 50% 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 35%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16634
26733
36733
46634
56733
66634
76733
86634
96535
106535
116436
126436
136337
146238
156238
166238
176238
186238
196238
206337
216436
226436
236535
246634
256733
266733
276733
286733
296733
306733

Chance of precipitation in September

Any precipitation

Saint Joseph gets around 3.3 in of rain over 8.2 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 (%)
127
227
327
427
527
627
727
828
928
1028
1129
1229
1330
1430
1530
1630
1730
1830
1930
2029
2129
2229
2328
2428
2527
2627
2726
2826
2926
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 41% 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 (%)
1121724379
2141824359
3161924338
4181924327
5202024306
6222024286
7252023275
8272023255
9292122244
10312121234
11332121224
12352020223
13372020213
14382019203
15402018192
16421918192
17441917182
18461816172
19481816162
20501815152
21541714141
22551714131
23581613121
24591613111
25611612101
2663151291
2764151281
2866151171
2968151070
3069151060

Wind in September

Winds average 8 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze

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 5:52 AM to 6:20 AM, and sunset from 6:47 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:526:47
212.95:536:45
312.85:536:43
412.85:546:42
512.75:556:40
612.75:566:38
712.75:576:37
812.65:586:35
912.65:596:33
1012.56:006:32
1112.56:016:30
1212.46:026:28
1312.46:036:27
1412.36:046:25
1512.36:056:23
1612.36:066:21
1712.26:076:20
1812.26:086:18
1912.16:096:16
2012.16:106:15
2112.06:116:13
2212.06:126:11
2311.96:136:09
2411.96:146:08
2511.96:156:06
2611.86:166:04
2711.86:176:03
2811.76:186:01
2911.76:195:59
3011.66:205:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.84 kWh/m².

For context, solar energy here swings from a low near 2.01 kWh/m² to a high of 6.56 kWh/m² in July across the year — September's 4.84 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.3Bright
45.3Bright
55.3Bright
65.2Bright
75.2Bright
85.1Bright
95.1Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.8Bright
174.7Bright
184.7Bright
194.6Bright
204.6Bright
214.6Bright
224.5Bright
234.5Bright
244.5Bright
254.4Bright
264.4Bright
274.4Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Is September a good time to visit Saint Joseph?

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

7.2
Sightseeing
1st-best month of the year
6.6
Beach & pool
4th-best month of the year

September is one of the better times to visit Saint Joseph for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Saint Joseph in September

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

In September, Saint Joseph sees daytime highs around 78°F and nights near 58°F. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.

light clothesrain gearsun protection

UV index in Saint Joseph 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 Saint Joseph peaks around June 22 at about 10 (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 10Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7High
May7High
Jun10Very high
Jul9Very high
Aug8Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Saint Joseph 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 Joseph is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1815 µg/m³Oct 227 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar12Moderate
Apr11Good
May12Good
Jun13Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov7Good
Dec9Good
Location & terrain

Where is Saint Joseph?

Saint Joseph sits at 39.8°N, 94.8°W, 886 ft above sea level, in United States. The nearest listed city is Leavenworth, 32 mi away.

Topography around Saint Joseph

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

Within 2 miles, the terrain around Saint Joseph has only modest variations in elevation — a maximum elevation change of 308 ft around an average of 909 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 397 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 640 ft.

The land around Saint Joseph is covered by trees (48%) and artificial surfaces (27%) within 2 miles, cropland (42%) and trees (33%) within 10 miles, and cropland (48%), grassland (26%) and trees (23%) within 50 miles.

2 miles
308 ft
10 miles
397 ft
50 miles
640 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Leavenworth 32 mi · Gladstone 42 mi · Liberty 43 mi · Kansas City 47 mi · Kansas City 48 mi · Shawnee 51 mi · Independence 52 mi · East Independence 53 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 Joseph (39.7686°, -94.8466°, elevation 886 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).