St. Charles weather in October

In October, St. Charles sees average daytime highs of 67°F and overnight lows near 53°F, with 3.4 in of rain across 7.7 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 72°F in the first days to 63°F by the end. The sky is clear or mostly clear about 42% 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 St. Charles's 1st-clearest and 8th-windiest month. For the whole year in context, see St. Charles's year-round climate.

Daytime high
67°
6th warmest
Overnight low
53°
7th coldest
Rainfall
3.4 in
7.7 wet days
Daylight
11 hours
6:23 AM – 5:22 PM
Cloud cover
51%
1st clearest
Wind
6 mph
8th windiest
Solar energy
3.37 kWh/m²
Travel score
6.6
out of 10

St. Charles is census designated place in Charles County, Maryland, United States.

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 72°F in the first days to 63°F by the end.

A typical October day in St. Charles reaches about 67°F in the afternoon and slips back to 53°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 58°F and 77°F. Set against its neighbours, October runs about 11°F cooler than September and about 11°F warmer than November.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
17359
27358
37258
47258
57257
67157
77156
87156
97056
107055
116955
126955
136954
146854
156853
166753
176752
186752
196652
206651
216551
226551
236550
246450
256449
266449
276349
286348
296348
306248
316247

How October really feels in St. Charles

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.

St. Charles 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
Jan44° / 31°3.08.72.79.60.7
Feb47° / 32°2.88.42.210.51.4
Mar55° / 39°3.910.11.511.73.5
Apr66° / 50°3.39.40136.0
May74° / 59°3.410.4014.16.7
Jun83° / 68°3.510.9014.65.7
Jul87° / 73°3.812014.44.6
Aug85° / 71°3.710.2013.55.4
Sep78° / 64°4.19.2012.36.9
Oct67° / 53°3.47.70116.6
Nov56° / 42°2.97.40.19.94.2
Dec48° / 35°3.38.71.29.41.8

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in October, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of October, with mostly cloudy or overcast conditions the remaining 44%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15545
25545
35644
45644
55644
65644
75644
85644
95743
105743
115743
125644
135644
145644
155743
165743
175842
185743
195743
205743
215743
225743
235644
245644
255545
265446
275446
285446
295446
305446
315446

Chance of precipitation in October

Any precipitation

St. Charles gets around 3.4 in of rain over 7.7 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 25% and peaks near 26% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
126
226
326
426
526
625
725
825
925
1025
1125
1226
1326
1426
1526
1626
1726
1825
1925
2025
2125
2225
2325
2425
2525
2625
2725
2825
2925
3025
3125

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 68% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1412218163
2432217153
3452217143
4472216133
5492115123
6512115103
753211493
855211383
957201373
1060201262
1161191262
1262191252
1365181142
1467171132
1568171032
1671161021
1771161021
187415911
197514911
207714810
217813810
227913710
238012710
248112610
258112610
268212510
278212510
288311510
298411410
308411410
318511310

Wind in October

Winds average 6 mph in October.

Across October, 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.

0246810151015202531
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
316calm

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 6:09 AM to 6:39 AM, and sunset from 5:45 PM to 5:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:095:45
211.66:105:43
311.56:105:42
411.56:115:40
511.46:125:38
611.46:135:37
711.36:145:35
811.36:155:34
911.36:165:32
1011.26:175:31
1111.26:185:29
1211.16:195:28
1311.16:205:26
1411.16:215:25
1511.06:225:23
1611.06:235:22
1710.96:245:21
1810.96:265:19
1910.96:275:18
2010.86:285:16
2110.86:295:15
2210.76:305:14
2310.76:315:13
2410.76:325:11
2510.66:335:10
2610.66:345:09
2710.56:355:08
2810.56:365:06
2910.56:375:05
3010.46:385:04
3110.46:395:03

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.37 kWh/m².

For context, solar energy here swings from a low near 2 kWh/m² to a high of 6.15 kWh/m² in June across the year — October's 3.37 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.7Moderate
43.7Moderate
53.7Moderate
63.7Moderate
73.6Moderate
83.6Moderate
93.6Moderate
103.5Moderate
113.5Moderate
123.5Moderate
133.5Moderate
143.4Moderate
153.4Moderate
163.4Moderate
173.4Moderate
183.3Moderate
193.3Moderate
203.3Moderate
213.2Moderate
223.2Moderate
233.1Moderate
243.1Moderate
253.1Moderate
263.0Moderate
273.0Moderate
283.0Moderate
293.0Moderate
302.9Moderate
312.9Moderate
Planning a trip in October

Hazard calendar for St. Charles

In seasonPeak

In October, St. Charles sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.

St. Charles 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 October a good time to visit St. Charles?

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

6.6
Sightseeing
3rd-best month of the year
3.3
Beach & pool
6th-best month of the year

October is a reasonable time to visit St. Charles for sightseeing.

What to pack for St. Charles in October

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

In October, St. Charles sees daytime highs around 67°F and nights near 53°F. Little to plan around — just the basics. About 8 days see rain.

Sea temperature near St. Charles in October

The nearest coast averages about 65°F in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 30 mi away) is warmest in August at about 78°F and coldest in February near 37°F.

It's comfortable for a long swim from Jun 16 to Oct 6 — about 3.7 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb37Bracing
Mar40Bracing
Apr47Bracing
May57Bracing
Jun68Refreshing
Jul76Warm
Aug78Warm
Sep74Refreshing
Oct65Cool
Nov54Bracing
Dec45Bracing

UV index in St. Charles 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 St. Charles peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 9Dec 19UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in St. Charles 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 St. Charles is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1416 µg/m³Nov 187 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar12Good
Apr13Moderate
May14Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov7Good
Dec8Good
Location & terrain

Where is St. Charles?

St. Charles sits at 38.6°N, 76.9°W, 207 ft above sea level, in United States. The nearest listed city is Saint Charles, 0.6 mi away.

Topography around St. Charles

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

Within 2 miles, the terrain around St. Charles has only modest variations in elevation — a maximum elevation change of 82 ft around an average of 213 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 315 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,539 ft.

The land around St. Charles is covered by trees (58%) and artificial surfaces (30%) within 2 miles, trees (77%) within 10 miles, and trees (59%) and water (21%) within 50 miles.

2 miles
82 ft
10 miles
315 ft
50 miles
1,539 ft
treesgrasslandcroplandartificial surfaceswaterwetland
October weather nearby: Saint Charles 0.6 mi · Waldorf 1.2 mi · Fort Washington 8.7 mi · Clinton 11 mi · Fort Hunt 11 mi · Hybla Valley 13 mi · Oxon Hill-Glassmanor 13 mi · Woodlawn 14 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 St. Charles (38.6073°, -76.9248°, elevation 207 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). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).