Portage weather in September

In September, Portage sees average daytime highs of 74°F and overnight lows near 57°F, with 3.1 in of rain across 8.9 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 78°F in the first days to 69°F by the end. The sky is clear or mostly clear about 42% 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 Portage's 1st-clearest and 9th-windiest month. For the whole year in context, see Portage's year-round climate.

Daytime high
74°
4th warmest
Overnight low
57°
9th coldest
Rainfall
3.1 in
8.9 wet days
Daylight
12 h 18 min
5:35 AM – 5:51 PM
Cloud cover
50%
1st clearest
Wind
8 mph
9th windiest
Solar energy
4.61 kWh/m²
Travel score
7.0
out of 10

Portage is city in Porter County, Indiana, United States.

Density
514/km²
people per km²
Founded
1967

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 78°F in the first days to 69°F by the end.

A typical September day in Portage reaches about 74°F in the afternoon and slips back to 57°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 84°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)
17963
27862
37862
47862
57861
67761
77761
87760
97660
107660
117659
127559
137558
147558
157458
167457
177457
187356
197356
207356
217255
227255
237155
247154
257154
267053
277053
286953
296952
306952

How September really feels in Portage

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.

Portage 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°2.69.76.79.30.0
Feb35° / 22°2.17.75.210.30.0
Mar45° / 31°3.010.43.211.71.1
Apr57° / 41°4.212.2113.13.8
May68° / 52°4.412.6014.35.9
Jun78° / 62°4.011.80156.4
Jul82° / 67°3.912.1014.76.2
Aug80° / 65°3.810.7013.76.6
Sep74° / 57°3.18.9012.37.0
Oct62° / 46°3.39.90.210.95.2
Nov48° / 35°2.99.41.59.71.8
Dec37° / 26°2.49.14.490.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% 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 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16139
26040
36040
46139
56139
66139
76139
86139
96040
106040
115941
125941
135842
145743
155743
165743
175743
185743
195545
205545
215545
225545
235446
245446
255446
265446
275347
285347
295347
305347

Chance of precipitation in September

Any precipitation

Portage gets around 3.1 in of rain over 8.9 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 31% and peaks near 32% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
131
231
331
431
531
632
732
832
932
1032
1132
1232
1332
1432
1532
1631
1731
1831
1930
2030
2130
2229
2329
2429
2529
2629
2729
2829
2929
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 45% of days. Sticky, muggy-or-worse air turns up on roughly 14% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1182525239
2192624228
3202724217
4222724207
5242824196
6262823185
7282823165
8302823154
9312723154
10342722143
11362722133
12382621122
13402621122
14422520112
15442519111
16462418101
17482417101
1851231691
1953231590
2056221480
2158211380
2260211270
2362201170
2462201170
2565191060
2665191060
276818950
286818950
297017940
307116940

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
17light breeze
28light breeze
38light breeze
48light breeze
58light 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
219light breeze
229light 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 5:19 AM to 5:50 AM, and sunset from 6:18 PM to 5:26 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:196:18
212.95:206:16
312.95:216:14
412.85:226:13
512.85:236:11
612.75:246:09
712.75:256:07
812.75:266:06
912.65:276:04
1012.65:286:02
1112.55:306:00
1212.55:315:58
1312.45:325:57
1412.45:335:55
1512.35:345:53
1612.35:355:51
1712.25:365:49
1812.25:375:48
1912.15:385:46
2012.15:395:44
2112.05:405:42
2212.05:415:40
2311.95:425:39
2411.95:435:37
2511.85:445:35
2611.85:455:33
2711.75:475:32
2811.75:485:30
2911.75:495:28
3011.65:505:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.61 kWh/m².

For context, solar energy here swings from a low near 1.6 kWh/m² to a high of 6.59 kWh/m² in June across the year — September's 4.61 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.1Bright
45.1Bright
55.0Bright
65.0Bright
75.0Bright
84.9Bright
94.9Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.4Bright
204.4Bright
214.3Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.1Bright
274.1Bright
284.0Bright
294.0Moderate
304.0Moderate
Planning a trip in September

Is September a good time to visit Portage?

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
5.4
Beach & pool
4th-best month of the year

September is one of the better times to visit Portage for general sightseeing.

What to pack for Portage in September

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

In September, Portage sees daytime highs around 74°F and nights near 57°F. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

Sea temperature near Portage in September

The nearest coast averages about 68°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 11 mi away) is warmest in August at about 73°F and coldest in February near 35°F.

It's comfortable for a long swim from Jul 10 to Sep 16 — 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
Feb35Bracing
Mar35Bracing
Apr39Bracing
May46Bracing
Jun59Cool
Jul70Refreshing
Aug73Refreshing
Sep68Refreshing
Oct58Bracing
Nov49Bracing
Dec42Bracing

UV index in Portage 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 Portage peaks around June 21 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 21UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Portage 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 Portage 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 Portage?

Portage sits at 41.6°N, 87.2°W, 636 ft above sea level, in United States. The nearest listed city is Hobart, 5.0 mi away.

Topography around Portage

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

Within 2 miles, the terrain around Portage has only modest variations in elevation — a maximum elevation change of 125 ft around an average of 643 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 354 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 673 ft.

The land around Portage is covered by trees (47%), artificial surfaces (25%) and grassland (20%) within 2 miles, trees (38%) and water (25%) within 10 miles, and cropland (37%), water (27%) and trees (20%) within 50 miles.

2 miles
125 ft
10 miles
354 ft
50 miles
673 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hobart 5.0 mi · Gary 8.7 mi · Valparaiso 9.3 mi · Merrillville 11 mi · Griffith 13 mi · Highland 14 mi · Crown Point 15 mi · East Chicago 15 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 Portage (41.5759°, -87.1762°, elevation 636 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).