Lawrence weather in September

In September, Lawrence sees average daytime highs of 77°F and overnight lows near 57°F, with 2.9 in of rain across 7.8 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 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 Lawrence's 1st-clearest and 10th-windiest month. For the whole year in context, see Lawrence's year-round climate.

Daytime high
77°
4th warmest
Overnight low
57°
9th coldest
Rainfall
2.9 in
7.8 wet days
Daylight
12 h 18 min
6:31 AM – 6:46 PM
Cloud cover
49%
1st clearest
Wind
7 mph
10th windiest
Solar energy
4.6 kWh/m²
Travel score
7.2
out of 10

Lawrence is city in Marion County, Indiana, United States.

Density
912/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 81°F in the first days to 73°F by the end.

A typical September day in Lawrence 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 6°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18263
28163
38162
48162
58062
68061
78061
88060
97960
107960
117959
127859
137858
147858
157758
167757
177757
187656
197656
207656
217555
227555
237454
247454
257454
267353
277353
287353
297252
307252

How September really feels in Lawrence

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.

Lawrence 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°3.29.54.39.50.0
Feb40° / 25°2.68.64.210.40.2
Mar51° / 33°3.911.1211.72.4
Apr63° / 44°4.712.20.4135.1
May73° / 55°4.813.5014.26.1
Jun81° / 64°4.211.4014.86.0
Jul84° / 67°3.511.3014.55.5
Aug83° / 65°2.89.2013.66.3
Sep77° / 57°2.97.8012.37.2
Oct65° / 46°3.38.70.110.96.0
Nov51° / 36°3.49.10.89.82.6
Dec40° / 27°3.210.13.59.20.2

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 40%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15941
25941
35941
46040
56040
66139
76139
86040
96040
106139
116139
126040
136040
146040
155941
166040
176040
186040
196040
206040
215941
225941
235941
245941
255941
265941
275941
285842
295842
305743

Chance of precipitation in September

Any precipitation

Lawrence gets around 2.9 in of rain over 7.8 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 29% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
129
229
329
428
528
627
727
826
926
1025
1125
1225
1325
1425
1525
1625
1725
1825
1926
2026
2126
2226
2326
2427
2527
2627
2727
2826
2926
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 46% of days. Sticky, muggy-or-worse air turns up on roughly 17% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1212123269
2232123258
3242123248
4262222237
5282222226
6302321215
7312321204
8332321194
9352321183
10362320183
11382320172
12402319162
13412319152
14432318151
15452317141
16472217131
17492216131
18512115121
19532114111
20552013111
21572013100
22591912100
2361191190
2463181090
2564181080
2665171080
276716970
286816970
296915970
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 6:16 AM to 6:45 AM, and sunset from 7:11 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.96:167:11
212.96:177:10
312.86:187:08
412.86:197:06
512.76:207:05
612.76:217:03
712.76:227:01
812.66:237:00
912.66:246:58
1012.56:256:56
1112.56:266:55
1212.46:276:53
1312.46:286:51
1412.36:296:50
1512.36:306:48
1612.36:316:46
1712.26:326:44
1812.26:336:43
1912.16:346:41
2012.16:356:39
2112.06:366:38
2212.06:376:36
2311.96:386:34
2411.96:396:32
2511.96:406:31
2611.86:406:29
2711.86:416:27
2811.76:426:26
2911.76:436:24
3011.66:456:22

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 1.7 kWh/m² to a high of 6.25 kWh/m² in June across the year — September's 4.6 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
84.9Bright
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
274.2Bright
284.1Bright
294.1Bright
304.0Bright
Planning a trip in September

Is September a good time to visit Lawrence?

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 Lawrence for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Lawrence in September

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

In September, Lawrence 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 Lawrence 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 Lawrence peaks around June 22 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 22UV 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 Lawrence 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 Lawrence 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 Lawrence?

Lawrence sits at 39.8°N, 86.0°W, 873 ft above sea level, in United States. The nearest listed city is Broad Ripple, 6.2 mi away.

Topography around Lawrence

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

Within 2 miles, the terrain around Lawrence has only modest variations in elevation — a maximum elevation change of 141 ft around an average of 860 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 302 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 833 ft.

The land around Lawrence is covered by trees (43%), artificial surfaces (35%) and grassland (20%) within 2 miles, trees (40%) and artificial surfaces (22%) within 10 miles, and cropland (63%) and trees (25%) within 50 miles.

2 miles
141 ft
10 miles
302 ft
50 miles
833 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Broad Ripple 6.2 mi · Fishers 8.1 mi · Indianapolis 8.7 mi · Carmel 11 mi · Greenfield 14 mi · Noblesville 14 mi · Zionsville 15 mi · Westfield 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 Lawrence (39.8387°, -86.0253°, elevation 873 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).