Anderson weather in September

In September, Anderson sees average daytime highs of 76°F and overnight lows near 57°F, with 2.8 in of rain across 7.7 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 72°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 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 Anderson's 1st-clearest and 10th-windiest month. For the whole year in context, see Anderson's year-round climate.

Daytime high
76°
4th warmest
Overnight low
57°
9th coldest
Rainfall
2.8 in
7.7 wet days
Daylight
12 h 18 min
6:29 AM – 6:45 PM
Cloud cover
50%
1st clearest
Wind
7 mph
10th windiest
Solar energy
4.57 kWh/m²
Travel score
7.2
out of 10

Anderson is city and county seat of Madison County, Indiana, United States.

Density
499/km²
people per km²

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 72°F by the end.

A typical September day in Anderson reaches about 76°F in the afternoon and slips back to 57°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 66°F and 87°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)
18162
28162
38062
48061
58061
68061
77960
87960
97960
107859
117859
127858
137758
147758
157757
167657
177656
187656
197556
207555
217555
227454
237454
247454
257353
267353
277352
287252
297252
307151

How September really feels in Anderson

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.

Anderson 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
Jan35° / 21°3.29.74.89.50.0
Feb39° / 24°2.68.84.410.40.1
Mar50° / 33°3.810.72.411.72.2
Apr62° / 44°4.612.20.6135.0
May72° / 54°4.613.7014.26.0
Jun80° / 63°4.112.1014.86.1
Jul83° / 66°3.411.7014.65.7
Aug82° / 64°2.99.4013.66.5
Sep76° / 57°2.87.7012.37.2
Oct64° / 46°3.28.80.110.95.8
Nov50° / 35°3.49.11.19.82.4
Dec40° / 26°3.110.23.69.20.1

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 17% of September, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
46040
56040
66040
76040
86139
96139
106139
116139
126139
136040
146040
156040
165941
175941
185941
195941
205941
215842
225842
235842
245842
255842
265743
275743
285743
295644
305644

Chance of precipitation in September

Any precipitation

Anderson gets around 2.8 in of rain over 7.7 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 26% and peaks near 27% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
127
227
327
426
526
626
725
825
925
1025
1125
1225
1325
1425
1525
1625
1726
1826
1926
2027
2127
2227
2327
2427
2527
2627
2727
2827
2927
3026

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 15% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1241925248
2252024247
3272024236
4292023226
5302123215
6322122204
7342222193
8362221183
9382220172
10392320172
11402319162
12422319151
13442318141
14452317141
15472217131
16492216121
17522215110
18532115110
19552114100
2058201390
2160201280
2261191280
2363191170
2465181070
2565181070
2667171060
276817960
286916960
297115950
307115950

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 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 6:15 AM to 6:43 AM, and sunset from 7:10 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:157:10
212.96:167:09
312.86:177:07
412.86:177:05
512.86:187:04
612.76:197:02
712.76:207:00
812.66:216:59
912.66:226:57
1012.56:236:55
1112.56:246:53
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
2611.86:396:28
2711.86:406:26
2811.76:416:24
2911.76:426:23
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 4.57 kWh/m².

For context, solar energy here swings from a low near 1.7 kWh/m² to a high of 6.28 kWh/m² in July across the year — September's 4.57 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.5Bright
174.5Bright
184.5Bright
194.4Bright
204.4Bright
214.4Bright
224.3Bright
234.3Bright
244.2Bright
254.2Bright
264.2Bright
274.1Bright
284.1Bright
294.0Bright
304.0Moderate
Planning a trip in September

Is September a good time to visit Anderson?

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

7.2
Sightseeing
1st-best month of the year
6.3
Beach & pool
3rd-best month of the year

September is one of the better times to visit Anderson for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Anderson in September

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

In September, Anderson sees daytime highs around 76°F and nights near 57°F. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

UV index in Anderson 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 Anderson peaks around June 20 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 highHighModerateJun 20UV 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 Anderson 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 Anderson 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 1317 µg/m³Oct 228 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar12Good
Apr12Good
May14Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Anderson?

Anderson sits at 40.1°N, 85.7°W, 879 ft above sea level, in United States. The nearest listed city is Muncie, 17 mi away.

Topography around Anderson

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

Within 2 miles, the terrain around Anderson has only modest variations in elevation — a maximum elevation change of 121 ft around an average of 879 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 397 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 804 ft.

The land around Anderson is covered by trees (45%), artificial surfaces (28%) and grassland (22%) within 2 miles, cropland (60%) and trees (22%) within 10 miles, and cropland (71%) within 50 miles.

2 miles
121 ft
10 miles
397 ft
50 miles
804 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Muncie 17 mi · Noblesville 18 mi · New Castle 21 mi · Fishers 21 mi · Greenfield 22 mi · Westfield 24 mi · Carmel 25 mi · Lawrence 26 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 Anderson (40.1053°, -85.6803°, elevation 879 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).