Michigan City weather in September

In September, Michigan City sees average daytime highs of 71°F and overnight lows near 62°F, with 3.4 in of rain across 10.3 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 75°F in the first days to 66°F by the end. The sky is clear or mostly clear about 44% 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 Michigan City's 1st-clearest and 9th-windiest month. For the whole year in context, see Michigan City's year-round climate.

Daytime high
71°
4th warmest
Overnight low
62°
9th coldest
Rainfall
3.4 in
10.3 wet days
Daylight
12 h 18 min
5:34 AM – 5:50 PM
Cloud cover
48%
1st clearest
Wind
10 mph
9th windiest
Solar energy
4.54 kWh/m²
Travel score
6.7
out of 10

Michigan City is city in LaPorte County, Indiana, United States.

Density
530/km²
people per km²
Founded
1830

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 75°F in the first days to 66°F by the end.

A typical September day in Michigan City reaches about 71°F in the afternoon and slips back to 62°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 63°F and 79°F. Set against its neighbours, September runs about 6°F cooler than August and about 12°F warmer than October.

40°50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17667
27667
37567
47566
57566
67566
77465
87465
97465
107364
117364
127364
137263
147263
157263
167162
177162
187162
197061
207061
216960
226960
236960
246859
256859
266758
276758
286758
296657
306657

How September really feels in Michigan City

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.

Michigan City weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan31° / 23°3.111.79.19.30.0
Feb32° / 23°2.48.66.210.30.0
Mar40° / 31°3.010.43.511.70.2
Apr50° / 41°4.312.31.313.12.2
May63° / 53°4.212.2014.35.1
Jun74° / 65°3.810.70156.7
Jul79° / 71°3.611.6014.76.6
Aug77° / 69°3.710.5013.76.9
Sep71° / 62°3.410.3012.36.7
Oct59° / 51°3.811.1010.94.6
Nov47° / 39°3.411.52.29.61.4
Dec37° / 30°2.911.46.590.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 44% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 42%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16238
26238
36139
46139
56139
66139
76139
86139
96238
106139
116040
126040
135941
145842
155842
165743
175743
185743
195743
205743
215545
225545
235545
245545
255446
265446
275347
285446
295446
305446

Chance of precipitation in September

Any precipitation

Michigan City gets around 3.4 in of rain over 10.3 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 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202530
Rain chance (%)
132
232
333
433
533
634
734
834
935
1035
1135
1236
1336
1436
1535
1635
1735
1835
1934
2034
2134
2234
2334
2434
2534
2634
2735
2835
2934
3034

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 35% of days. Sticky, muggy-or-worse air turns up on roughly 19% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1924272613
21124272612
31224282511
41425282410
5152528239
6172528228
7182528217
8202628206
9222528205
10242528194
11252527184
12272527173
13292526173
14312626162
15322625152
16342624142
17362623131
18382622131
19402621121
20432619111
21452618101
22472617101
2349251690
2452251580
2554241480
2656241370
2758231270
2860221260
2961221160
3063211150

Wind in September

Winds average 10 mph in September.

Across September, daily wind ranges from about 9 mph on the calmest days to 11 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
19light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1611light breeze
1711light breeze
1811light breeze
1911light breeze
2011light breeze
2111light breeze
2211light breeze
2311light breeze
2411light breeze
2511light breeze
2611light breeze
2711light breeze
2811light breeze
2911light breeze
3011light 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 5:18 AM to 5:49 AM, and sunset from 6:17 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:186:17
212.95:196:15
312.95:206:13
412.85:216:12
512.85:226:10
612.85:236:08
712.75:246:06
812.75:256:05
912.65:266:03
1012.65:276:01
1112.55:285:59
1212.55:295:57
1312.45:305:56
1412.45:325:54
1512.35:335:52
1612.35:345:50
1712.25:355:48
1812.25:365:47
1912.15:375:45
2012.15:385:43
2112.05:395:41
2212.05:405:39
2311.95:415:38
2411.95:425:36
2511.85:435:34
2611.85:445:32
2711.75:455:30
2811.75:475:29
2911.75:485:27
3011.65:495:25

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.54 kWh/m².

For context, solar energy here swings from a low near 1.48 kWh/m² to a high of 6.6 kWh/m² in June across the year — September's 4.54 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.0Bright
284.0Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Michigan City?

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

6.7
Sightseeing
2nd-best month of the year
4.5
Beach & pool
4th-best month of the year

September is a reasonable time to visit Michigan City for sightseeing.

What to pack for Michigan City in September

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

In September, Michigan City sees daytime highs around 71°F and nights near 62°F. Worth packing: rain gear and sun protection. About 10 days see rain.

rain gearsun protection

Sea temperature near Michigan City in September

The nearest coast averages about 69°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 12 mi away) is warmest in August at about 73°F and coldest in March near 36°F.

It's comfortable for a long swim from Jul 11 to Sep 17 — about 2.3 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar36Bracing
Apr39Bracing
May46Bracing
Jun58Bracing
Jul70Refreshing
Aug73Refreshing
Sep69Refreshing
Oct59Bracing
Nov49Bracing
Dec43Bracing

UV index in Michigan City 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 Michigan City peaks around June 20 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 highHighModerateLowJun 20UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Michigan City 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 Michigan City is worst in June — around 23 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (November, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 1922 µg/m³Nov 119 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar17Moderate
Apr19Moderate
May21Moderate
Jun23Moderate
Jul22Moderate
Aug18Moderate
Sep14Moderate
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Michigan City?

Michigan City sits at 41.7°N, 86.9°W, 627 ft above sea level, in United States. The nearest listed city is La Porte, 12 mi away.

Topography around Michigan City

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

Within 2 miles, the terrain around Michigan City has only modest variations in elevation — a maximum elevation change of 157 ft around an average of 623 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 420 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 686 ft.

The land around Michigan City is covered by trees (40%) and artificial surfaces (33%) within 2 miles, water (42%) and trees (33%) within 10 miles, and water (35%), cropland (32%) and trees (20%) within 50 miles.

2 miles
157 ft
10 miles
420 ft
50 miles
686 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: La Porte 12 mi · Portage 17 mi · Valparaiso 18 mi · Hobart 22 mi · Gary 25 mi · Merrillville 27 mi · East Chicago 29 mi · Griffith 30 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 Michigan City (41.7075°, -86.895°, elevation 627 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. 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).