Marion weather in September

In September, Marion sees average daytime highs of 76°F and overnight lows near 56°F, with 2.6 in of rain across 8.5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 80°F in the first days to 71°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 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Marion's 1st-clearest and 10th-windiest month. For the whole year in context, see Marion's year-round climate.

Daytime high
76°
4th warmest
Overnight low
56°
9th coldest
Rainfall
2.6 in
8.5 wet days
Daylight
12 h 18 min
6:29 AM – 6:45 PM
Cloud cover
51%
1st clearest
Wind
7 mph
10th windiest
Solar energy
4.52 kWh/m²
Travel score
7.1
out of 10

Marion is city in and the county seat of Grant County, Indiana, United States.

Density
715/km²
people per km²
Founded
1831

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 80°F in the first days to 71°F by the end.

A typical September day in Marion reaches about 76°F in the afternoon and slips back to 56°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 65°F and 86°F. Set against its neighbours, September runs about 5°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18062
28061
38061
47961
57960
67960
77960
87859
97859
107858
117758
127758
137757
147657
157656
167656
177656
187555
197555
207454
217454
227454
237353
247353
257353
267252
277252
287151
297151
307151

How September really feels in Marion

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.

Marion weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan34° / 20°2.99.75.29.40.0
Feb38° / 23°2.48.54.610.40.0
Mar49° / 31°3.510.62.811.72.0
Apr62° / 42°4.312.30.5134.8
May71° / 53°4.413.7014.26.0
Jun80° / 63°4.212.2014.86.2
Jul83° / 66°3.411.2014.65.9
Aug81° / 64°3.39.7013.66.6
Sep76° / 56°2.68.5012.37.1
Oct64° / 45°3.19.30.110.95.7
Nov50° / 35°3.391.49.72.3
Dec39° / 26°2.89.83.89.20.1

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 17% of September, with mostly cloudy or overcast conditions the remaining 43%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25941
35941
45941
55941
65842
75842
85842
95842
105743
115743
125743
135644
145644
155644
165644
175545
185644
195644
205644
215644
225644
235644
245644
255644
265644
275545
285545
295545
305545

Chance of precipitation in September

Any precipitation

Marion gets around 2.6 in of rain over 8.5 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 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
528
628
727
827
927
1027
1127
1228
1328
1428
1528
1629
1729
1829
1929
2030
2130
2230
2331
2431
2531
2631
2731
2831
2931
3030

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 50% 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 (%)
1242124247
2252223246
3272222235
4292322225
5312321214
6332321203
7352320193
8362320182
9382319172
10402319161
11422319151
12432318151
13452318141
14472218131
15482217120
16512117110
17532116100
1855201690
1956201590
2059191480
2161181470
2262181370
2364171270
2466171160
2567161160
2668161060
2770151050
2870151050
297214950
307314940

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.

051015151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light 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 12 h 54 min 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 78 minutes over September. Sunrise moves from 6:14 AM to 6:43 AM, and sunset from 7:11 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:147:11
212.96:157:09
312.96:167:07
412.86:177:06
512.86:187:04
612.76:197:02
712.76:207:01
812.66:216:59
912.66:226:57
1012.56:236:55
1112.56:246:54
1212.46:256:52
1312.46:266:50
1412.46:276:48
1512.36:286:47
1612.36:296:45
1712.26:306:43
1812.26:316:41
1912.16:326:40
2012.16:336:38
2112.06:346:36
2212.06:356:34
2311.96:366:33
2411.96:376:31
2511.96:386:29
2611.86:396:27
2711.86:406:26
2811.76:416:24
2911.76:426:22
3011.66:436:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.52 kWh/m².

For context, solar energy here swings from a low near 1.68 kWh/m² to a high of 6.3 kWh/m² in July across the year — September's 4.52 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.0Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.8Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.0Bright
284.0Bright
294.0Moderate
303.9Moderate
Planning a trip in September

Is September a good time to visit Marion?

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

7.1
Sightseeing
1st-best month of the year
6.0
Beach & pool
4th-best month of the year

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

What to pack for Marion in September

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

In September, Marion sees daytime highs around 76°F and nights near 56°F. Worth packing: light clothes, rain gear and sun protection. About 9 days see rain.

light clothesrain gearsun protection

UV index in Marion 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 Marion peaks around June 19 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 19UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Marion 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 Marion is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1416 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar12Moderate
Apr12Moderate
May14Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Marion?

Marion sits at 40.6°N, 85.7°W, 810 ft above sea level, in United States. The nearest listed city is Huntington, 24 mi away.

Topography around Marion

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

Within 2 miles, the terrain around Marion has only modest variations in elevation — a maximum elevation change of 167 ft around an average of 840 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 266 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 728 ft.

The land around Marion is covered by trees (38%), grassland (28%) and artificial surfaces (25%) within 2 miles, cropland (67%) within 10 miles, and cropland (75%) within 50 miles.

2 miles
167 ft
10 miles
266 ft
50 miles
728 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Huntington 24 mi · Kokomo 25 mi · Muncie 29 mi · Anderson 31 mi · Logansport 39 mi · Noblesville 40 mi · Westfield 43 mi · Fishers 45 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 Marion (40.5584°, -85.6591°, elevation 810 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. 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).