Greenfield weather in September

In September, Greenfield sees average daytime highs of 77°F and overnight lows near 57°F, with 3.0 in of rain across 7.9 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 81°F in the first days to 73°F by the end. The sky is clear or mostly clear about 43% 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 Greenfield's 1st-clearest and 9th-windiest month. For the whole year in context, see Greenfield's year-round climate.

Daytime high
77°
4th warmest
Overnight low
57°
9th coldest
Rainfall
3.0 in
7.9 wet days
Daylight
12 h 18 min
6:30 AM – 6:45 PM
Cloud cover
49%
1st clearest
Wind
7 mph
9th windiest
Solar energy
4.6 kWh/m²
Travel score
7.2
out of 10

Greenfield is city in Indiana, United States; county seat of Hancock County.

Density
655/km²
people per km²
Founded
1828

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 73°F by the end.

A typical September day in Greenfield 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 67°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)
18163
28162
38162
48162
58061
68061
78061
88060
97960
107960
117959
127859
137858
147858
157757
167757
177757
187656
197656
207655
217555
227555
237454
247454
257453
267353
277353
287352
297252
307252

How September really feels in Greenfield

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.

Greenfield weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan36° / 22°3.39.94.49.50.0
Feb40° / 24°2.78.84.210.40.1
Mar51° / 33°4.010.92.111.72.4
Apr63° / 44°4.712.60.5135.1
May72° / 55°4.913.5014.26.1
Jun81° / 64°4.211.9014.86.0
Jul83° / 67°3.611.6014.55.6
Aug82° / 65°2.89.5013.66.4
Sep77° / 57°3.07.9012.37.2
Oct65° / 46°3.38.80.110.96.0
Nov51° / 35°3.59.10.99.82.6
Dec40° / 27°3.310.53.59.20.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 41%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
45941
55941
66040
76040
86040
96139
106040
116040
126040
135941
145941
156040
166040
175941
185941
195941
205941
215941
225941
236040
245941
255941
265941
275941
285941
295941
305842

Chance of precipitation in September

Any precipitation

Greenfield gets around 3.0 in of rain over 7.9 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 27% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
128
228
328
428
527
627
726
826
925
1025
1125
1225
1325
1425
1525
1626
1726
1826
1927
2027
2127
2227
2328
2428
2528
2628
2728
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 (%)
1232023259
2242122248
3262122248
4282121237
5292221226
6312221215
7332320205
8352320194
9362319183
10382319173
11402319162
12412318162
13432317152
14442317141
15462316141
16482315131
17502215121
18512214121
19542113111
20562112101
21582012100
2260201190
2362191180
2464181080
2564181080
2666171070
276717970
286916960
297015960
307015960

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
227calm
237light 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
412.86:187:05
512.76:197:04
612.76:207:02
712.76:217:00
812.66:226:59
912.66:236:57
1012.56:246:55
1112.56:256:54
1212.46:266:52
1312.46:276:50
1412.36:286:49
1512.36:296:47
1612.36:306:45
1712.26:316:43
1812.26:326:42
1912.16:336:40
2012.16:346:38
2112.06:356:37
2212.06:366:35
2311.96:366:33
2411.96:376:31
2511.96:386:30
2611.86:396:28
2711.86:406:26
2811.76:416:25
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 4.6 kWh/m².

For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 6.27 kWh/m² in July across the year — September's 4.6 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.7Bright
154.6Bright
164.6Bright
174.5Bright
184.5Bright
194.5Bright
204.4Bright
214.4Bright
224.3Bright
234.3Bright
244.3Bright
254.2Bright
264.2Bright
274.1Bright
284.1Bright
294.1Bright
304.0Bright
Planning a trip in September

Is September a good time to visit Greenfield?

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
6.4
Beach & pool
3rd-best month of the year

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

What to pack for Greenfield in September

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

In September, Greenfield sees daytime highs around 77°F and nights near 57°F. Worth packing: light clothes and sun protection. About 8 days see rain.

light clothessun protection

UV index in Greenfield 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 Greenfield peaks around June 21 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highHighModerateJun 21UV 9Dec 21UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov3Moderate
Dec2Low

Air quality in Greenfield 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 Greenfield 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 Greenfield?

Greenfield sits at 39.8°N, 85.8°W, 883 ft above sea level, in United States. The nearest listed city is Lawrence, 14 mi away.

Topography around Greenfield

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

Within 2 miles, the terrain around Greenfield has only modest variations in elevation — a maximum elevation change of 85 ft around an average of 886 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 299 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 837 ft.

The land around Greenfield is covered by cropland (28%), grassland (27%) and trees (23%) within 2 miles, cropland (69%) within 10 miles, and cropland (61%) and trees (25%) within 50 miles.

2 miles
85 ft
10 miles
299 ft
50 miles
837 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Lawrence 14 mi · Fishers 17 mi · Shelbyville 18 mi · Broad Ripple 21 mi · Indianapolis 21 mi · Greenwood 22 mi · Noblesville 22 mi · Anderson 22 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 Greenfield (39.785°, -85.7694°, elevation 883 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).