Saint Peters weather in October

In October, Saint Peters sees average daytime highs of 67°F and overnight lows near 48°F, with 3.3 in of rain across 8.5 wet days and about 11 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 73°F in the first days to 61°F by the end. The sky is clear or mostly clear about 45% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 24 min by month's end. Set against the rest of the year, October is Saint Peters's 2nd-clearest and 7th-windiest month. For the whole year in context, see Saint Peters's year-round climate.

Daytime high
67°
6th warmest
Overnight low
48°
7th coldest
Rainfall
3.3 in
8.5 wet days
Daylight
11 hours
6:18 AM – 5:17 PM
Cloud cover
50%
2nd clearest
Wind
7 mph
7th windiest
Solar energy
3.46 kWh/m²
Travel score
6.6
out of 10

Saint Peters is city in Missouri.

Density
908/km²
people per km²
Founded
1910

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 73°F in the first days to 61°F by the end.

A typical October day in Saint Peters reaches about 67°F in the afternoon and slips back to 48°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 54°F and 80°F. Set against its neighbours, October runs about 12°F cooler than September and about 13°F warmer than November.

20°40°60°80°151015202531
Avg high (°F)Avg low (°F)
17453
27453
37353
47352
57352
67251
77251
87151
97150
107050
117049
126949
136949
146848
156848
166748
176747
186747
196647
206646
216546
226546
236446
246445
256345
266345
276244
286244
296243
306143
316043

How October really feels in Saint Peters

Once humidity and wind are folded in, October 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

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

Saint Peters weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan40° / 24°2.57.739.60.0
Feb44° / 28°2.47.62.910.50.8
Mar55° / 37°3.610.61.411.73.5
Apr66° / 47°4.511.30.2135.8
May75° / 57°4.913.3014.16.3
Jun84° / 66°4.011.1014.75.5
Jul87° / 70°3.29.9014.44.6
Aug86° / 67°3.09.2013.55.2
Sep79° / 59°3.27.6012.37.1
Oct67° / 48°3.38.50116.6
Nov54° / 37°3.58.30.89.93.5
Dec43° / 28°2.47.72.29.30.6

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 11% of October, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16535
26535
36436
46436
56337
66238
76238
86139
96040
106040
115941
125842
135842
145842
155842
165644
175644
185644
195545
205545
215347
225347
235248
245248
255149
265050
275050
284951
294951
304951
314852

Chance of precipitation in October

Any precipitation

Saint Peters gets around 3.3 in of rain over 8.5 wet days in October. 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 30% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
122
222
322
422
522
623
724
824
925
1026
1126
1227
1327
1428
1528
1629
1729
1829
1929
2029
2130
2230
2330
2430
2530
2630
2730
2830
2930
3030
3129

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 79% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
16316129
26515119
36714118
46714118
56914107
67013107
77113106
87212106
9741295
10751294
11771184
12781183
13781183
14801172
15811072
16821071
17821071
18831061
1984961
2085960
2185960
2285960
2385960
2485960
2585960
2686860
2786860
2887850
2987850
3087850
3187850

Wind in October

Winds average 7 mph in October.

Across October, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over October. Sunrise moves from 6:03 AM to 6:35 AM, and sunset from 5:40 PM to 4:57 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:035:40
211.66:045:38
311.56:055:36
411.56:065:35
511.46:075:33
611.46:085:32
711.36:095:30
811.36:105:28
911.36:115:27
1011.26:125:25
1111.26:135:24
1211.16:145:22
1311.16:155:21
1411.16:165:19
1511.06:175:18
1611.06:185:17
1710.96:205:15
1810.96:215:14
1910.86:225:12
2010.86:235:11
2110.86:245:10
2210.76:255:08
2310.76:265:07
2410.66:275:06
2510.66:285:05
2610.66:295:03
2710.56:305:02
2810.56:315:01
2910.56:325:00
3010.46:344:59
3110.46:354:57

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.46 kWh/m².

For context, solar energy here swings from a low near 1.92 kWh/m² to a high of 6.42 kWh/m² in June across the year — October's 3.46 kWh/m² falls in the middle.

012345151015202531
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.1Bright
44.1Bright
54.0Bright
64.0Moderate
73.9Moderate
83.9Moderate
93.8Moderate
103.8Moderate
113.7Moderate
123.7Moderate
133.6Moderate
143.6Moderate
153.5Moderate
163.5Moderate
173.4Moderate
183.4Moderate
193.3Moderate
203.3Moderate
213.2Moderate
223.2Moderate
233.1Moderate
243.1Moderate
253.0Moderate
263.0Moderate
273.0Moderate
282.9Moderate
292.9Moderate
302.8Moderate
312.8Moderate
Planning a trip in October

Is October a good time to visit Saint Peters?

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

6.6
Sightseeing
2nd-best month of the year
3.3
Beach & pool
6th-best month of the year

October is a reasonable time to visit Saint Peters for sightseeing.

What to pack for Saint Peters in October

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

In October, Saint Peters sees daytime highs around 67°F and nights near 48°F. Worth packing: rain gear. About 9 days see rain.

rain gear

UV index in Saint Peters in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 4 — 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 Peters peaks around June 22 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 9Jan 1UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr7High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep7High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Saint Peters in October

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Saint Peters is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (October, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1616 µg/m³Oct 237 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar11Good
Apr10Good
May13Moderate
Jun14Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct7Good
Nov7Good
Dec8Good
Location & terrain

Where is Saint Peters?

Saint Peters sits at 38.8°N, 90.6°W, 440 ft above sea level, in United States. The nearest listed city is O'Fallon, 3.7 mi away.

Topography around Saint Peters

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

Within 2 miles, the terrain around Saint Peters has only modest variations in elevation — a maximum elevation change of 167 ft around an average of 469 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 469 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 978 ft.

The land around Saint Peters is covered by artificial surfaces (32%), trees (26%) and cropland (26%) within 2 miles, trees (36%) and cropland (27%) within 10 miles, and trees (51%) and cropland (32%) within 50 miles.

2 miles
167 ft
10 miles
469 ft
50 miles
978 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: O'Fallon 3.7 mi · Saint Charles 8.1 mi · Chesterfield 9.9 mi · Maryland Heights 12 mi · Wentzville 12 mi · Hazelwood 14 mi · Creve Coeur 15 mi · Ballwin 15 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 Peters (38.8003°, -90.6265°, elevation 440 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).