Marquette weather in September

In September, Marquette sees average daytime highs of 66°F and overnight lows near 50°F, with 3.5 in of rain across 11.6 wet days and about 12.4 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 70°F in the first days to 60°F by the end. The sky is clear or mostly clear about 27% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Marquette's 4th-clearest and 6th-windiest month. For the whole year in context, see Marquette's year-round climate.

Daytime high
66°
4th warmest
Overnight low
50°
9th coldest
Rainfall
3.5 in
11.6 wet days
Daylight
12 h 18 min
6:34 AM – 6:54 PM
Cloud cover
60%
4th clearest
Wind
9 mph
6th windiest
Solar energy
3.89 kWh/m²
Travel score
5.7
out of 10

Marquette is city in the U.S. state of Michigan and County seat of Marquette County, Michigan.

Density
421/km²
people per km²
Founded
1849

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 70°F in the first days to 60°F by the end.

A typical September day in Marquette reaches about 66°F in the afternoon and slips back to 50°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 55°F and 77°F. Set against its neighbours, September runs about 7°F cooler than August and about 14°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17155
27054
37054
47054
56954
66953
76953
86953
96852
106852
116852
126751
136751
146751
156651
166650
176550
186550
196549
206449
216449
226348
236348
246247
256247
266147
276146
286046
296046
306045

How September really feels in Marquette

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.

Marquette 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
Jan22° / 10°1.58.710.78.80.0
Feb24° / 10°1.26.47.3100.0
Mar34° / 19°1.98.8711.60.0
Apr45° / 30°2.710.65.413.31.1
May58° / 41°3.011.10.714.84.2
Jun68° / 52°3.211015.66.1
Jul74° / 58°3.211.4015.26.8
Aug73° / 57°3.110.70146.7
Sep66° / 50°3.511.6012.45.7
Oct52° / 40°3.513.61.510.72.6
Nov39° / 29°2.310.67.79.20.2
Dec29° / 19°1.89.811.38.40.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% 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 55%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25149
35149
44951
54951
64951
74852
84951
94852
104852
114753
124654
134654
144654
154555
164456
174357
184357
194357
204357
214357
224159
234159
244159
254159
264159
274159
284159
294159
304159

Chance of precipitation in September

Any precipitation

Marquette gets around 3.5 in of rain over 11.6 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 38% and peaks near 43% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
231
332
432
533
634
734
835
936
1037
1137
1238
1338
1439
1539
1639
1739
1840
1940
2040
2141
2241
2342
2442
2542
2643
2743
2843
2943
3043

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 70% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14928186
25027176
35226175
45425165
55524165
65723164
75922154
86121153
96121153
106320143
116320143
126520132
136719122
146719122
156819112
166919102
17711892
18731881
19741781
20751771
21771661
22791551
23801451
24821341
25841231
26841231
27861121
28871021
2988921
3090820

Wind in September

Winds average 9 mph in September.

Across September, daily wind ranges from about 8 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
3010light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 12 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 102 minutes over September. Sunrise moves from 6:14 AM to 6:53 AM, and sunset from 7:24 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.26:147:24
213.16:167:22
313.16:177:20
413.06:187:18
512.96:207:16
612.96:217:14
712.86:227:12
812.86:247:10
912.76:257:08
1012.76:267:06
1112.66:287:04
1212.66:297:02
1312.56:307:00
1412.46:316:58
1512.46:336:56
1612.36:346:54
1712.36:356:52
1812.26:376:50
1912.26:386:47
2012.16:396:45
2112.06:416:43
2212.06:426:41
2311.96:436:39
2411.96:456:37
2511.86:466:35
2611.86:476:33
2711.76:496:31
2811.66:506:29
2911.66:526:27
3011.56:536:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.89 kWh/m².

For context, solar energy here swings from a low near 1.14 kWh/m² to a high of 6.39 kWh/m² in June across the year — September's 3.89 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.5Bright
44.5Bright
54.4Bright
64.4Bright
74.3Bright
84.3Bright
94.2Bright
104.2Bright
114.1Bright
124.1Bright
134.0Bright
144.0Moderate
153.9Moderate
163.9Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.6Moderate
233.5Moderate
243.5Moderate
253.4Moderate
263.4Moderate
273.3Moderate
283.3Moderate
293.2Moderate
303.2Moderate
Planning a trip in September

Is September a good time to visit Marquette?

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

5.7
Sightseeing
4th-best month of the year
2.4
Beach & pool
4th-best month of the year

September is a reasonable time to visit Marquette for sightseeing.

What to pack for Marquette in September

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

In September, Marquette sees daytime highs around 66°F and nights near 50°F. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Marquette in September

The nearest coast averages about 59°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 62°F and coldest in March near 34°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

30°40°50°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan36Bracing
Feb35Bracing
Mar34Bracing
Apr35Bracing
May38Bracing
Jun43Bracing
Jul54Bracing
Aug62Cool
Sep59Cool
Oct51Bracing
Nov44Bracing
Dec40Bracing

UV index in Marquette 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 Marquette peaks around June 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 17UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May7High
Jun8Very high
Jul7Very high
Aug7High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Marquette?

Marquette sits at 46.5°N, 87.4°W, 666 ft above sea level, in United States. The nearest listed city is Mackinac Island, 141 mi away.

Topography around Marquette

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

Within 2 miles, the terrain around Marquette has only modest variations in elevation — a maximum elevation change of 410 ft around an average of 686 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,060 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,667 ft.

The land around Marquette is covered by water (38%), trees (32%) and artificial surfaces (21%) within 2 miles, trees (48%) and water (44%) within 10 miles, and trees (56%) and water (41%) within 50 miles.

2 miles
410 ft
10 miles
1,060 ft
50 miles
1,667 ft
treesgrasslandartificial surfaceswater
September weather nearby: Mackinac Island 141 mi · Howard 142 mi · Green Bay 143 mi · Sault Ste. Marie 145 mi · Sault Ste. Marie 145 mi · Ashwaubenon 146 mi · Bellevue 147 mi · De Pere 149 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 Marquette (46.5435°, -87.3954°, elevation 666 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).