Saint Charles weather in March

In March, Saint Charles sees average daytime highs of 55°F and overnight lows near 39°F, with 3.9 in of precipitation across 10.1 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 51°F in the first days to 59°F by the end. The sky is clear or mostly clear about 31% of the time in March, and the air most often feels dry.

Daylight stretches from about 11 h 06 min at the start of March to 12 h 18 min by month's end. Set against the rest of the year, March is Saint Charles's 10th-clearest and 1st-windiest month. For the whole year in context, see Saint Charles's year-round climate.

Daytime high
55°
9th warmest
Overnight low
39°
4th coldest
Precipitation
3.9 in
10.1 wet days
Daylight
11 h 42 min
6:27 AM – 6:08 PM
Cloud cover
60%
10th clearest
Wind
7 mph
1st windiest
Solar energy
4.15 kWh/m²
Travel score
3.5
out of 10

Saint 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 March

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 51°F in the first days to 59°F by the end.

A typical March day in Saint Charles reaches about 55°F in the afternoon and slips back to 39°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 43°F and 69°F. Set against its neighbours, March runs about 8°F warmer than February and about 11°F cooler than April.

20°40°60°80°151015202531
Avg high (°F)Avg low (°F)
15035
25136
35136
45136
55236
65237
75237
85337
95337
105337
115338
125438
135438
145438
155539
165539
175539
185540
195540
205640
215641
225641
235742
245742
255842
265843
275843
285943
295944
306044
316044

How March really feels in Saint Charles

Once humidity and wind are folded in, March averages 0 days that feel above 90°F and 10 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
10
wind chill below the day's low

The story in March is cold — wind chill drags the overnight "feels like" below the raw low.

Saint Charles weather by month

How March compares with the rest of the year at a glance. March is the 9th-warmest and 2nd-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 March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 15% of March, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14654
24654
34753
44753
54753
64852
74852
84852
94951
104852
114951
124951
134852
144852
154852
164852
174654
184654
194654
204456
214456
224456
234357
244357
254456
264456
274555
284555
294555
304555
314753

Chance of precipitation in March

Any precipitationSnow

Saint Charles gets around 3.9 in of rain and snow over 10.1 wet days in March. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 33% and peaks near 33% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1327
2327
3327
4327
5327
6327
7327
8327
9326
10326
11326
12326
13335
14335
15335
16335
17334
18334
19334
20334
21334
22333
23333
24333
25332
26332
27332
28332
29332
30331
31331

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, March lands in the dry band about 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19910
29910
39910
49910
59910
69910
79910
89910
99910
109910
119910
129910
139910
149910
159910
169910
179910
189910
199820
209820
219820
229820
239820
249820
259820
269730
279730
289730
299730
309730
319631

Wind in March

Winds average 7 mph in March, the windiest month of the year.

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

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47light breeze
57light breeze
67light breeze
77light breeze
87light breeze
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 March

DaylightNight

Daylight runs from about 11 h 06 min at the start of March to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 72 minutes over March. Sunrise moves from 6:49 AM to 6:03 AM, and sunset from 5:53 PM to 6:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.16:495:53
211.16:485:54
311.16:465:55
411.26:455:56
511.26:445:57
611.36:425:58
711.36:415:59
811.36:396:00
911.46:386:01
1011.46:366:02
1111.56:356:03
1211.56:336:04
1311.66:316:05
1411.66:306:06
1511.66:286:07
1611.76:276:08
1711.76:256:09
1811.86:246:10
1911.86:226:11
2011.96:206:12
2111.96:196:13
2211.96:176:14
2312.06:166:15
2412.06:146:16
2512.16:126:17
2612.16:116:18
2712.26:096:19
2812.26:086:20
2912.26:066:21
3012.36:046:22
3112.36:036:23

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 4.15 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 — March's 4.15 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
13.6Moderate
23.7Moderate
33.7Moderate
43.8Moderate
53.8Moderate
63.9Moderate
73.9Moderate
84.0Moderate
94.0Bright
104.0Bright
114.1Bright
124.1Bright
134.1Bright
144.1Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.3Bright
214.3Bright
224.3Bright
234.4Bright
244.4Bright
254.4Bright
264.5Bright
274.5Bright
284.6Bright
294.6Bright
304.7Bright
314.7Bright
Planning a trip in March

Hazard calendar for Saint Charles

In seasonPeak

None of Saint Charles's seasonal hazards are active in March. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Saint 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 March a good time to visit Saint Charles?

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

3.5
Sightseeing
9th-best month of the year
0.1
Beach & pool
9th-best month of the year

March is a weaker month for outdoor sightseeing in Saint Charles.

What to pack for Saint Charles in March

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

In March, Saint Charles sees daytime highs around 55°F and nights near 39°F. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

Sea temperature near Saint Charles in March

The nearest coast averages about 40°F in March — 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 Saint Charles in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 5 — 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 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 Saint Charles in March

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Saint 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 Saint Charles?

Saint Charles sits at 38.6°N, 76.9°W, 200 ft above sea level, in United States. The nearest listed city is St. Charles, 0.6 mi away.

Topography around Saint Charles

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

Within 2 miles, the terrain around Saint Charles has only modest variations in elevation — a maximum elevation change of 98 ft around an average of 213 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 312 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,539 ft.

The land around Saint Charles is covered by trees (61%) and artificial surfaces (24%) within 2 miles, trees (77%) within 10 miles, and trees (60%) and water (20%) within 50 miles.

2 miles
98 ft
10 miles
312 ft
50 miles
1,539 ft
treesgrasslandcroplandartificial surfaceswaterwetland
March weather nearby: St. Charles 0.6 mi · Waldorf 1.2 mi · Fort Washington 8.7 mi · Fort Hunt 11 mi · Clinton 11 mi · Hybla Valley 12 mi · Woodlawn 13 mi · Oxon Hill-Glassmanor 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 Saint Charles (38.6032°, -76.9386°, elevation 200 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).