Middle River weather in September

In September, Middle River sees average daytime highs of 76°F and overnight lows near 64°F, with 4.7 in of rain across 9.4 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 80°F in the first days to 72°F by the end. The sky is clear or mostly clear about 39% 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 Middle River's 2nd-clearest and 9th-windiest month. For the whole year in context, see Middle River's year-round climate.

Daytime high
76°
4th warmest
Overnight low
64°
9th coldest
Rainfall
4.7 in
9.4 wet days
Daylight
12 h 18 min
5:52 AM – 6:08 PM
Cloud cover
54%
2nd clearest
Wind
8 mph
9th windiest
Solar energy
4.25 kWh/m²
Travel score
7.0
out of 10

Middle River is census designated place in Baltimore County, Maryland, United States.

Density
1,143/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 80°F in the first days to 72°F by the end.

A typical September day in Middle River reaches about 76°F in the afternoon and slips back to 64°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 83°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)
18069
28069
38068
48068
57968
67967
77967
87967
97867
107866
117866
127765
137765
147765
157664
167664
177664
187564
197563
207563
217462
227462
237462
247361
257361
267361
277260
287260
297260
307159

How September really feels in Middle River

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.

Middle River 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
Jan40° / 30°3.692.79.50.0
Feb42° / 31°3.39.13.110.50.4
Mar50° / 37°4.510.52.111.72.2
Apr61° / 47°3.810.40.2134.9
May70° / 57°3.811014.16.3
Jun79° / 67°3.510.9014.76.5
Jul84° / 72°3.811.4014.55.5
Aug82° / 71°3.610.4013.56.1
Sep76° / 64°4.79.4012.37.0
Oct65° / 53°4.08.40116.2
Nov54° / 42°3.48.30.29.83.5
Dec45° / 35°4.39.61.69.31.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25743
35743
45743
55644
65644
75743
85743
95743
105743
115644
125545
135545
145446
155545
165446
175347
185248
195248
205149
215149
225050
235149
245149
255248
265248
275347
285446
295545
305545

Chance of precipitation in September

Any precipitation

Middle River gets around 4.7 in of rain over 9.4 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 30% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
130
230
330
431
531
631
731
830
930
1030
1129
1229
1329
1428
1528
1628
1728
1829
1929
2029
2130
2230
2330
2430
2530
2630
2730
2830
2930
3029

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 28% of days. Sticky, muggy-or-worse air turns up on roughly 31% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
111152724221
212152724211
313152723211
414152723201
515162722191
616162722181
717162721181
818172721171
919172721161
1020172721150
1121172721130
1223172621120
1324182521110
1425182521100
152718242290
162818242280
172918232270
183019232260
193219222260
203319212250
213419212140
223619202130
233720202130
243920192020
254019192020
264219181920
274319181810
284519171810
294619171710
304819161610

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
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147light breeze
157light 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 5:38 AM to 6:06 AM, and sunset from 6:33 PM to 5:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:386:33
212.95:396:31
312.85:406:29
412.85:416:28
512.75:426:26
612.75:436:24
712.65:446:23
812.65:456:21
912.65:466:19
1012.55:476:18
1112.55:486:16
1212.45:496:14
1312.45:506:13
1412.35:516:11
1512.35:526:09
1612.35:526:08
1712.25:536:06
1812.25:546:04
1912.15:556:03
2012.15:566:01
2112.05:575:59
2212.05:585:58
2311.95:595:56
2411.96:005:54
2511.96:015:52
2611.86:025:51
2711.86:035:49
2811.76:045:47
2911.76:055:46
3011.66:065:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 1.9 kWh/m² to a high of 6.07 kWh/m² in June across the year — September's 4.25 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.4Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.2Bright
204.1Bright
214.1Bright
224.0Bright
234.0Moderate
244.0Moderate
253.9Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.8Moderate
Planning a trip in September

Hazard calendar for Middle River

In seasonPeak

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

Middle River 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 Middle River?

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

7.0
Sightseeing
1st-best month of the year
6.0
Beach & pool
4th-best month of the year

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

What to pack for Middle River in September

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

In September, Middle River sees daytime highs around 76°F and nights near 64°F. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

Sea temperature near Middle River 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 15 mi away) is warmest in August at about 78°F and coldest in February near 36°F.

It's comfortable for a long swim from Jun 16 to Oct 5 — 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
Feb36Bracing
Mar40Bracing
Apr47Bracing
May58Bracing
Jun68Refreshing
Jul76Warm
Aug78Warm
Sep74Refreshing
Oct65Cool
Nov53Bracing
Dec44Bracing

UV index in Middle River 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 Middle River peaks around July 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 10UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug6High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Middle River 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 Middle River is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1216 µg/m³Nov 118 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar13Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep12Good
Oct9Good
Nov8Good
Dec10Good
Location & terrain

Where is Middle River?

Middle River sits at 39.3°N, 76.4°W, 26 ft above sea level, in United States. The nearest listed city is Rossville, 1.9 mi away.

Topography around Middle River

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

Within 2 miles, the terrain around Middle River has only modest variations in elevation — a maximum elevation change of 184 ft around an average of 56 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 614 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,388 ft.

The land around Middle River is covered by trees (40%) and artificial surfaces (39%) within 2 miles, trees (37%), water (30%) and artificial surfaces (20%) within 10 miles, and trees (49%) within 50 miles.

2 miles
184 ft
10 miles
614 ft
50 miles
1,388 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Rossville 1.9 mi · Essex 2.5 mi · Rosedale 4.3 mi · Perry Hall 5.6 mi · Frankford 5.6 mi · Carney 6.2 mi · Parkville 6.2 mi · Dundalk 7.5 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 Middle River (39.3343°, -76.4394°, elevation 26 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).