Waldorf weather in September

In September, Waldorf sees average daytime highs of 78°F and overnight lows near 64°F, with 4.1 in of rain across 9.2 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 82°F in the first days to 74°F by the end. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels muggy.

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 Waldorf's 3rd-clearest and 9th-windiest month. For the whole year in context, see Waldorf's year-round climate.

Daytime high
78°
4th warmest
Overnight low
64°
9th coldest
Rainfall
4.1 in
9.2 wet days
Daylight
12 h 12 min
5:55 AM – 6:09 PM
Cloud cover
56%
3rd clearest
Wind
6 mph
9th windiest
Solar energy
4.3 kWh/m²
Travel score
6.9
out of 10

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

Density
717/km²
people per km²

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 74°F by the end.

A typical September day in Waldorf reaches about 78°F in the afternoon and slips back to 64°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 70°F and 87°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

50°60°70°80°90°151015202530
Avg high (°F)Avg low (°F)
18269
28269
38269
48268
58268
68168
78167
88167
98067
108066
118066
127966
137965
147965
157865
167864
177864
187764
197763
207763
217663
227662
237662
247562
257561
267561
277460
287460
297460
307359

How September really feels in Waldorf

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.

Waldorf weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-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 September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15347
25347
35347
45347
55347
65347
75446
85446
95347
105347
115347
125347
135347
145248
155347
165248
175149
185149
195050
205050
215050
225149
235149
245149
255248
265347
275347
285347
295545
305545

Chance of precipitation in September

Any precipitation

Waldorf gets around 4.1 in of rain over 9.2 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
131
231
332
432
532
632
731
831
931
1030
1129
1229
1328
1428
1527
1627
1727
1827
1927
2028
2128
2228
2328
2428
2528
2628
2727
2827
2927
3027

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 25% of days. Sticky, muggy-or-worse air turns up on roughly 36% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
15132432251
26132431241
36142531231
47152530221
58152629211
69162628201
710162628191
811172727181
912182727161
1013182726151
1114182726141
1215192726131
1316192626120
1417202626110
1519202626100
162021252590
172121252580
182222252570
192322252560
202422242450
212522242450
222623232340
232823232340
242923222230
253123222230
263223212130
273423212030
283523201920
293722201820
303922191730

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
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 5:41 AM to 6:08 AM, and sunset from 6:34 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:416:34
212.85:426:32
312.85:436:31
412.85:446:29
512.75:456:28
612.75:466:26
712.65:466:24
812.65:476:23
912.55:486:21
1012.55:496:19
1112.55:506:18
1212.45:516:16
1312.45:526:14
1412.35:536:13
1512.35:546:11
1612.25:556:09
1712.25:566:08
1812.25:576:06
1912.15:576:05
2012.15:586:03
2112.05:596:01
2212.06:006:00
2311.96:015:58
2411.96:025:56
2511.96:035:55
2611.86:045:53
2711.86:055:51
2811.76:065:50
2911.76:075:48
3011.66:085:46

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.3 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 — September's 4.3 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.8Bright
54.7Bright
64.7Bright
74.7Bright
84.6Bright
94.6Bright
104.5Bright
114.5Bright
124.5Bright
134.4Bright
144.4Bright
154.3Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.0Bright
244.0Bright
254.0Moderate
263.9Moderate
273.9Moderate
283.9Moderate
293.9Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Waldorf

In seasonPeak

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

Waldorf 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 Waldorf?

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
6.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Waldorf for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Waldorf in September

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

In September, Waldorf sees daytime highs around 78°F and nights near 64°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Waldorf in September

The nearest coast averages about 74°F in September — 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 Waldorf in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Waldorf 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 Waldorf 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 Waldorf 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 Waldorf?

Waldorf sits at 38.6°N, 76.9°W, 210 ft above sea level, in United States. The nearest listed city is St. Charles, 1.2 mi away.

Topography around Waldorf

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

Within 2 miles, the terrain around Waldorf has only modest variations in elevation — a maximum elevation change of 121 ft around an average of 217 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 328 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,539 ft.

The land around Waldorf is covered by trees (60%) and artificial surfaces (26%) within 2 miles, trees (76%) within 10 miles, and trees (60%) and water (20%) within 50 miles.

2 miles
121 ft
10 miles
328 ft
50 miles
1,539 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: St. Charles 1.2 mi · Saint Charles 1.2 mi · Fort Washington 7.5 mi · Fort Hunt 9.9 mi · Clinton 9.9 mi · Hybla Valley 12 mi · Oxon Hill-Glassmanor 12 mi · Woodlawn 12 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 Waldorf (38.6246°, -76.9391°, elevation 210 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).