La Porte weather in September

In September, La Porte sees average daytime highs of 75°F and overnight lows near 56°F, with 3.2 in of rain across 9.3 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 79°F in the first days to 70°F by the end. The sky is clear or mostly clear about 40% 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 La Porte's 1st-clearest and 9th-windiest month. For the whole year in context, see La Porte's year-round climate.

Daytime high
75°
4th warmest
Overnight low
56°
9th coldest
Rainfall
3.2 in
9.3 wet days
Daylight
12 h 18 min
5:33 AM – 5:49 PM
Cloud cover
51%
1st clearest
Wind
7 mph
9th windiest
Solar energy
4.5 kWh/m²
Travel score
6.9
out of 10

La Porte is city in LaPorte County, Indiana, United States of America.

Density
684/km²
people per km²
Founded
1832

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 79°F in the first days to 70°F by the end.

A typical September day in La Porte reaches about 75°F in the afternoon and slips back to 56°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 85°F. Set against its neighbours, September runs about 6°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17961
27960
37960
47860
57860
67859
77859
87758
97758
107758
117657
127657
137656
147556
157556
167555
177455
187455
197454
207354
217353
227253
237253
247252
257152
267151
277051
287051
297050
306950

How September really feels in La Porte

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.

La Porte 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
Jan32° / 20°2.610.57.79.30.0
Feb36° / 22°2.18.25.510.30.0
Mar47° / 30°3.010.83.411.71.4
Apr59° / 41°4.212.2113.14.3
May70° / 51°4.513.2014.36.0
Jun79° / 61°4.212.10156.3
Jul83° / 65°4.111.7014.75.9
Aug81° / 63°4.011.1013.76.5
Sep75° / 56°3.29.3012.36.9
Oct62° / 45°3.210.10.110.95.3
Nov48° / 35°2.99.81.99.71.9
Dec37° / 26°2.49.45.290.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 45%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25743
35743
45842
55842
65842
75842
85743
95743
105743
115743
125644
135644
145545
155644
165545
175545
185545
195545
205446
215446
225347
235347
245347
255248
265248
275248
285248
295248
305248

Chance of precipitation in September

Any precipitation

La Porte gets around 3.2 in of rain over 9.3 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 32% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
132
232
332
432
532
632
732
833
933
1033
1133
1233
1333
1432
1532
1632
1732
1831
1931
2031
2131
2231
2331
2431
2531
2632
2732
2832
2932
3032

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 48% 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 (%)
1202624237
2222723226
3232723216
4252822205
5272822185
6292922174
7312822164
8332821153
9352821143
10372721133
11392720122
12412620112
13432520112
14452519101
1547241891
1649231891
1752221781
1854211681
1956201581
2060191470
2162181370
2264181260
2366171160
2466171160
2569161050
2669161050
277115950
287215940
297314940
307514830

Wind in September

Winds average 7 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.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227light 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 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 5:17 AM to 5:48 AM, and sunset from 6:16 PM to 5:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:176:16
212.95:186:14
312.95:196:13
412.85:206:11
512.85:216:09
612.75:226:07
712.75:236:06
812.75:256:04
912.65:266:02
1012.65:276:00
1112.55:285:58
1212.55:295:57
1312.45:305:55
1412.45:315:53
1512.35:325:51
1612.35:335:49
1712.25:345:48
1812.25:355:46
1912.15:365:44
2012.15:375:42
2112.05:385:40
2212.05:395:39
2311.95:405:37
2411.95:415:35
2511.85:435:33
2611.85:445:31
2711.75:455:30
2811.75:465:28
2911.75:475:26
3011.65:485:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.5 kWh/m².

For context, solar energy here swings from a low near 1.56 kWh/m² to a high of 6.47 kWh/m² in June across the year — September's 4.5 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.5Bright
174.4Bright
184.4Bright
194.3Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.1Bright
254.1Bright
264.0Bright
274.0Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit La Porte?

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
5.6
Beach & pool
4th-best month of the year

September is a reasonable time to visit La Porte for sightseeing.

What to pack for La Porte in September

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

In September, La Porte sees daytime highs around 75°F and nights near 56°F. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near La Porte 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 21 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 La Porte 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 La Porte 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 La Porte 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 La Porte is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1516 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb13Moderate
Mar14Moderate
Apr13Moderate
May15Moderate
Jun15Moderate
Jul17Moderate
Aug15Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is La Porte?

La Porte sits at 41.6°N, 86.7°W, 817 ft above sea level, in United States. The nearest listed city is Michigan City, 12 mi away.

Topography around La Porte

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

Within 2 miles, the terrain around La Porte has only modest variations in elevation — a maximum elevation change of 135 ft around an average of 810 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 417 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 758 ft.

The land around La Porte is covered by trees (39%) and artificial surfaces (20%) within 2 miles, cropland (46%) and trees (38%) within 10 miles, and cropland (41%), water (26%) and trees (22%) within 50 miles.

2 miles
135 ft
10 miles
417 ft
50 miles
758 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Michigan City 12 mi · Valparaiso 21 mi · Portage 24 mi · South Bend 24 mi · Hobart 29 mi · Mishawaka 29 mi · Gary 33 mi · Granger 33 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 La Porte (41.6077°, -86.7139°, elevation 817 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).