Avon weather in September

In September, Avon sees average daytime highs of 77°F and overnight lows near 57°F, with 2.8 in of rain across 7.4 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 81°F in the first days to 72°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 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 Avon's 1st-clearest and 10th-windiest month. For the whole year in context, see Avon's year-round climate.

Daytime high
77°
4th warmest
Overnight low
57°
9th coldest
Rainfall
2.8 in
7.4 wet days
Daylight
12 h 18 min
6:32 AM – 6:48 PM
Cloud cover
48%
1st clearest
Wind
7 mph
10th windiest
Solar energy
4.63 kWh/m²
Travel score
7.3
out of 10

Avon is town in Indiana, United States.

Density
443/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 81°F in the first days to 72°F by the end.

A typical September day in Avon reaches about 77°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 86°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)
18163
28162
38162
48162
58061
68061
78061
88060
97960
107959
117959
127859
137858
147858
157757
167757
177656
187656
197656
207555
217555
227555
237454
247454
257453
267353
277353
287352
297252
307251

How September really feels in Avon

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.

Avon 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
Jan36° / 22°3.294.39.50.0
Feb40° / 25°2.68.44.110.40.1
Mar51° / 33°3.810.82.111.72.3
Apr63° / 44°4.911.80.3135.1
May72° / 55°4.913.4014.26.1
Jun81° / 64°4.411.7014.86.1
Jul84° / 67°3.711.3014.55.5
Aug82° / 65°3.09.3013.66.3
Sep77° / 57°2.87.4012.37.3
Oct64° / 46°3.38.60.110.95.9
Nov51° / 35°3.58.80.99.82.5
Dec40° / 27°3.09.73.59.20.1

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 17% of September, with mostly cloudy or overcast conditions the remaining 39%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
26040
36040
46139
56139
66238
76238
86337
96337
106337
116337
126238
136238
146238
156139
166139
176139
186040
196040
206139
216040
226040
236040
246040
256040
266040
276040
286040
296040
305941

Chance of precipitation in September

Any precipitation

Avon gets around 2.8 in of rain over 7.4 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 25% and peaks near 27% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
126
225
325
425
525
625
724
824
924
1023
1123
1223
1324
1424
1524
1624
1725
1825
1925
2026
2126
2226
2327
2427
2527
2627
2727
2827
2927
3027

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 47% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1212124259
2222123249
3242223238
4262223227
5282223216
6292223205
7312222195
8332222184
9352222183
10372221173
11382221162
12402221152
13422220152
14442119141
15462119141
16482118131
17502017121
18512016121
19551915110
20571814110
21591813100
22601812100
2362171290
2463171190
2566161080
2666161080
2768151070
286915970
297114960
307114960

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 6:18 AM to 6:46 AM, and sunset from 7:13 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:187:13
212.96:197:11
312.86:207:10
412.86:217:08
512.76:227:06
612.76:237:05
712.76:247:03
812.66:257:01
912.66:257:00
1012.56:266:58
1112.56:276:56
1212.46:286:54
1312.46:296:53
1412.36:306:51
1512.36:316:49
1612.36:326:48
1712.26:336:46
1812.26:346:44
1912.16:356:42
2012.16:366:41
2112.06:376:39
2212.06:386:37
2311.96:396:36
2411.96:406:34
2511.96:416:32
2611.86:426:31
2711.86:436:29
2811.76:446:27
2911.76:456:26
3011.66:466:24

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.63 kWh/m².

For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 6.3 kWh/m² in June across the year — September's 4.63 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
94.9Bright
104.8Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.5Bright
214.4Bright
224.4Bright
234.3Bright
244.3Bright
254.3Bright
264.2Bright
274.2Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Is September a good time to visit Avon?

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

7.3
Sightseeing
1st-best month of the year
6.4
Beach & pool
3rd-best month of the year

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

What to pack for Avon in September

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

In September, Avon sees daytime highs around 77°F and nights near 57°F. Worth packing: light clothes and sun protection. About 7 days see rain.

light clothessun protection

UV index in Avon 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 Avon peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJul 11UV 9Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Avon 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 Avon 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).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1416 µg/m³Oct 218 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Moderate
Mar12Moderate
Apr12Good
May14Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Avon?

Avon sits at 39.8°N, 86.4°W, 833 ft above sea level, in United States. The nearest listed city is Plainfield, 4.3 mi away.

Topography around Avon

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

Within 2 miles, the terrain around Avon has only modest variations in elevation — a maximum elevation change of 167 ft around an average of 837 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 407 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 682 ft.

The land around Avon is covered by trees (37%), grassland (33%) and artificial surfaces (20%) within 2 miles, cropland (31%), trees (29%) and grassland (24%) within 10 miles, and cropland (54%) and trees (33%) within 50 miles.

2 miles
167 ft
10 miles
407 ft
50 miles
682 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Plainfield 4.3 mi · Fairfield Heights 4.3 mi · Brownsburg 5.6 mi · Indianapolis 13 mi · Zionsville 15 mi · Broad Ripple 16 mi · Greenwood 19 mi · Lebanon 20 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 Avon (39.7628°, -86.3997°, elevation 833 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).