Muskegon weather in September

In September, Muskegon sees average daytime highs of 70°F and overnight lows near 56°F, with 3.4 in of rain across 10.4 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 74°F in the first days to 65°F by the end. The sky is clear or mostly clear about 38% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Muskegon's 3rd-clearest and 9th-windiest month. For the whole year in context, see Muskegon's year-round climate.

Daytime high
70°
4th warmest
Overnight low
56°
9th coldest
Rainfall
3.4 in
10.4 wet days
Daylight
12 h 18 min
6:31 AM – 6:48 PM
Cloud cover
53%
3rd clearest
Wind
8 mph
9th windiest
Solar energy
4.37 kWh/m²
Travel score
6.5
out of 10

Muskegon is city in and seat of Muskegon County, Michigan, United States.

Density
818/km²
people per km²
Founded
1837

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 74°F in the first days to 65°F by the end.

A typical September day in Muskegon reaches about 70°F in the afternoon and slips back to 56°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 78°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17561
27561
37461
47460
57460
67460
77360
87359
97359
107258
117258
127158
137158
147157
157057
167056
177056
186956
196955
206955
216855
226854
236754
246753
256653
266653
276552
286552
296551
306451

How September really feels in Muskegon

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.

Muskegon weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan30° / 21°2.311.1119.20.0
Feb31° / 20°1.887.110.20.0
Mar40° / 27°2.49.44.411.60.3
Apr52° / 38°3.912.11.713.22.6
May63° / 49°4.011.4014.55.4
Jun74° / 60°3.510.6015.16.8
Jul78° / 65°3.910.7014.96.7
Aug77° / 64°3.810.7013.86.9
Sep70° / 56°3.410.4012.36.5
Oct58° / 46°3.712.10.110.84.0
Nov46° / 36°2.811.63.49.51.1
Dec36° / 28°2.511.59.58.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26139
36139
46139
56139
66238
76139
86139
96040
105941
115941
125842
135743
145743
155644
165644
175644
185446
195446
205446
215347
225248
235149
245149
255050
264951
274951
284951
294951
305050

Chance of precipitation in September

Any precipitation

Muskegon gets around 3.4 in of rain over 10.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 35% and peaks near 40% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
231
331
431
531
631
731
831
932
1032
1132
1233
1333
1434
1534
1634
1735
1835
1936
2036
2137
2237
2338
2439
2539
2640
2740
2840
2940
3040

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 46% of days. Sticky, muggy-or-worse air turns up on roughly 13% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1212625207
2232625207
3252624196
4262624186
5282623185
6292722174
7312622174
8332622163
9342621163
10362621152
11372521152
12392520142
13412520131
14422519121
15442519121
16452518111
17472518101
1849241790
1951241690
2053241580
2156231470
2257231370
2360221260
2462221150
2564211050
2666201040
276720940
286919840
297218730
307317730

Wind in September

Winds average 8 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours 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 84 minutes over September. Sunrise moves from 6:14 AM to 6:47 AM, and sunset from 7:16 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:147:16
213.06:157:14
312.96:167:12
412.96:177:10
512.86:187:09
612.86:197:07
712.76:207:05
812.76:227:03
912.66:237:01
1012.66:246:59
1112.56:256:57
1212.56:266:56
1312.46:276:54
1412.46:286:52
1512.36:296:50
1612.36:316:48
1712.26:326:46
1812.26:336:44
1912.16:346:42
2012.16:356:40
2112.06:366:39
2212.06:376:37
2311.96:396:35
2411.96:406:33
2511.86:416:31
2611.86:426:29
2711.76:436:27
2811.76:446:26
2911.66:466:24
3011.66:476:22

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.37 kWh/m².

For context, solar energy here swings from a low near 1.25 kWh/m² to a high of 6.7 kWh/m² in June across the year — September's 4.37 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
44.9Bright
54.9Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.2Bright
194.2Bright
204.1Bright
214.1Bright
224.0Bright
234.0Moderate
243.9Moderate
253.9Moderate
263.8Moderate
273.8Moderate
283.7Moderate
293.7Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Muskegon?

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

6.5
Sightseeing
4th-best month of the year
4.1
Beach & pool
4th-best month of the year

September is a reasonable time to visit Muskegon for sightseeing.

What to pack for Muskegon in September

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

In September, Muskegon sees daytime highs around 70°F and nights near 56°F. Worth packing: rain gear. About 10 days see rain.

rain gear

Sea temperature near Muskegon in September

The nearest coast averages about 67°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 10 mi away) is warmest in August at about 70°F and coldest in March near 36°F.

It's comfortable for a long swim from Jul 24 to Sep 5 — about 1.4 months when the water holds above 68°F.

30°40°50°60°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°F)Comfort
Jan39Bracing
Feb37Bracing
Mar36Bracing
Apr38Bracing
May43Bracing
Jun55Bracing
Jul67Cool
Aug70Refreshing
Sep67Cool
Oct58Bracing
Nov49Bracing
Dec43Bracing

UV index in Muskegon in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Muskegon peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 20UV 9Dec 23UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May7Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep5High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Muskegon?

Muskegon sits at 43.2°N, 86.2°W, 617 ft above sea level, in United States. The nearest listed city is Norton Shores, 4.3 mi away.

Topography around Muskegon

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

Within 2 miles, the terrain around Muskegon has only modest variations in elevation — a maximum elevation change of 115 ft around an average of 610 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 240 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 810 ft.

The land around Muskegon is covered by artificial surfaces (32%), trees (31%) and water (24%) within 2 miles, trees (57%) and water (27%) within 10 miles, and water (45%) and trees (35%) within 50 miles.

2 miles
115 ft
10 miles
240 ft
50 miles
810 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Norton Shores 4.3 mi · Allendale 24 mi · Walker 29 mi · Holland 32 mi · Jenison 32 mi · Grandville 33 mi · Grand Rapids 35 mi · Wyoming 35 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 Muskegon (43.2342°, -86.2484°, elevation 617 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. 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).