Derby weather in September

In September, Derby sees average daytime highs of 82°F and overnight lows near 61°F, with 3.0 in of rain across 7 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 87°F in the first days to 78°F by the end. The sky is clear or mostly clear about 54% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Derby's 1st-clearest and 10th-windiest month. For the whole year in context, see Derby's year-round climate.

Daytime high
82°
4th warmest
Overnight low
61°
9th coldest
Rainfall
3.0 in
7 wet days
Daylight
12 h 12 min
6:16 AM – 6:31 PM
Cloud cover
40%
1st clearest
Wind
9 mph
10th windiest
Solar energy
5.04 kWh/m²
Travel score
6.7
out of 10

Derby is city in Sedgwick County, Kansas, United States.

Density
888/km²
people per km²
Founded
1871

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 87°F in the first days to 78°F by the end.

A typical September day in Derby reaches about 82°F in the afternoon and slips back to 61°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 92°F. Set against its neighbours, September runs about 8°F cooler than August and about 12°F warmer than October.

40°60°80°100°151015202530
Avg high (°F)Avg low (°F)
18766
28766
38766
48665
58665
68565
78564
88564
98464
108463
118363
128362
138362
148262
158261
168261
178160
188160
198059
208059
218058
228058
237958
247957
257957
267856
277856
287855
297755
307755

How September really feels in Derby

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.

Derby weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan44° / 25°1.14.31.99.70.9
Feb49° / 28°1.45.31.710.62.2
Mar59° / 37°2.87.71.111.74.8
Apr68° / 46°3.89.60.212.96.4
May77° / 57°5.411.40146.6
Jun86° / 67°4.610.4014.55.0
Jul91° / 71°3.08.1014.34.0
Aug89° / 69°3.07.5013.44.5
Sep82° / 61°3.07012.36.7
Oct70° / 48°3.270.1117.3
Nov57° / 36°1.75.30.5104.6
Dec46° / 27°1.54.82.19.51.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 54% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 32%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17228
27129
37129
47129
57030
66931
76832
86832
96733
106634
116535
126535
136535
146535
156535
166535
176535
186634
196634
206832
216832
226931
237030
247129
257129
267129
277129
287129
297129
307129

Chance of precipitation in September

Any precipitation

Derby gets around 3.0 in of rain over 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 24% and peaks near 26% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
121
221
321
421
522
622
723
823
924
1024
1125
1225
1326
1426
1526
1626
1726
1826
1926
2026
2125
2224
2324
2423
2522
2622
2722
2821
2921
3021

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 37% of days. Sticky, muggy-or-worse air turns up on roughly 24% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1121731356
2131731345
3151830325
4171929305
5181929294
6201929284
7221928274
8241927263
9261926253
10271926253
11291925253
12301924242
13321824242
14341823232
15351823222
16371822222
17381721212
18401721212
19421720202
20441719192
21461718182
22481717172
23501616162
24531615142
25551614132
26581613121
27591613111
28611612101
2963161191
3064161181

Wind in September

Winds average 9 mph in September.

Across September, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 6:03 AM to 6:29 AM, and sunset from 6:54 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:036:54
212.86:046:53
312.86:056:51
412.76:066:50
512.76:076:48
612.66:086:46
712.66:096:45
812.66:096:43
912.56:106:42
1012.56:116:40
1112.46:126:39
1212.46:136:37
1312.46:146:35
1412.36:156:34
1512.36:156:32
1612.26:166:31
1712.26:176:29
1812.26:186:27
1912.16:196:26
2012.16:206:24
2112.06:216:22
2212.06:216:21
2311.96:226:19
2411.96:236:18
2511.96:246:16
2611.86:256:14
2711.86:266:13
2811.76:276:11
2911.76:286:10
3011.76:296:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.04 kWh/m².

For context, solar energy here swings from a low near 2.34 kWh/m² to a high of 6.88 kWh/m² in July across the year — September's 5.04 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.6Bright
35.6Bright
45.5Bright
55.5Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.2Bright
115.1Bright
125.1Bright
135.0Bright
145.0Bright
155.0Bright
164.9Bright
174.9Bright
184.9Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.6Bright
284.6Bright
294.6Bright
304.5Bright
Planning a trip in September

Is September a good time to visit Derby?

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

6.7
Sightseeing
2nd-best month of the year
7.3
Beach & pool
1st-best month of the year

September is a reasonable time to visit Derby for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Derby in September

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

In September, Derby sees daytime highs around 82°F and nights near 61°F. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Derby in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Derby peaks around June 22 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highHighModerateJun 22UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr8Very high
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec2Moderate
Location & terrain

Where is Derby?

Derby sits at 37.5°N, 97.3°W, 1,293 ft above sea level, in United States. The nearest listed city is Wichita, 11 mi away.

Topography around Derby

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

Within 2 miles, the terrain around Derby has only modest variations in elevation — a maximum elevation change of 138 ft around an average of 1,283 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 249 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 751 ft.

The land around Derby is covered by trees (39%) and grassland (24%) within 2 miles, cropland (37%), grassland (31%) and trees (20%) within 10 miles, and cropland (46%) and grassland (44%) within 50 miles.

2 miles
138 ft
10 miles
249 ft
50 miles
751 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Wichita 11 mi · Newton 35 mi · Hutchinson 51 mi · Ponca City 59 mi · Emporia 84 mi · Enid 86 mi · Bartlesville 90 mi · Salina 91 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 Derby (37.5456°, -97.2689°, elevation 1,293 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).