Altus weather in September

In September, Altus sees average daytime highs of 86°F and overnight lows near 64°F, with 2.6 in of rain across 6.8 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 90°F in the first days to 82°F by the end. The sky is clear or mostly clear about 59% 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 Altus's 3rd-clearest and 11th-windiest month. For the whole year in context, see Altus's year-round climate.

Daytime high
86°
4th warmest
Overnight low
64°
9th coldest
Rainfall
2.6 in
6.8 wet days
Daylight
12 h 12 min
6:25 AM – 6:38 PM
Cloud cover
37%
3rd clearest
Wind
9 mph
11th windiest
Solar energy
5.3 kWh/m²
Travel score
5.8
out of 10

Altus is city in Jackson County, Oklahoma, United States.

Density
399/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 90°F in the first days to 82°F by the end.

A typical September day in Altus reaches about 86°F in the afternoon and slips back to 64°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 95°F. Set against its neighbours, September runs about 8°F cooler than August and about 11°F warmer than October.

40°60°80°100°151015202530
Avg high (°F)Avg low (°F)
19169
29069
39069
48969
58968
68968
78867
88867
98767
108767
118766
128666
138665
148665
158565
168564
178564
188564
198463
208463
218462
228362
238362
248361
258361
268260
278260
288260
298259
308159

How September really feels in Altus

Once humidity and wind are folded in, September averages 3 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
3
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Altus weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan52° / 30°1.23.80.99.93.3
Feb56° / 33°1.44.81.210.74.5
Mar65° / 42°2.46.50.611.76.6
Apr74° / 50°3.36.9012.87.5
May82° / 60°4.09.7013.86.3
Jun90° / 69°2.97.8014.34.2
Jul95° / 73°1.44.9014.13.0
Aug94° / 72°1.95.8013.33.3
Sep86° / 64°2.66.8012.25.8
Oct74° / 52°2.96.1011.17.8
Nov62° / 40°1.74.70.310.26.3
Dec53° / 32°1.44.11.19.73.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 59% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 26%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17624
27525
37525
47426
57426
67327
77327
87228
97228
107228
117129
127129
137129
147030
157030
167030
177030
187030
197228
207228
217327
227525
237525
247723
257723
267723
277822
287822
297822
307723

Chance of precipitation in September

Any precipitation

Altus gets around 2.6 in of rain over 6.8 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 23% and peaks near 26% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
122
222
323
423
524
624
725
825
926
1026
1126
1226
1326
1426
1526
1626
1725
1825
1924
2023
2122
2221
2320
2419
2518
2618
2717
2817
2917
3017

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 30% of days. Sticky, muggy-or-worse air turns up on roughly 26% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1112034332
2122034322
3132033312
4152033302
5162032302
6172031302
7182031293
8192030293
9191929293
10201929293
11211928293
12221928292
13231928282
14241827282
15261827272
16271826272
17291826262
18311825252
19331725241
20351724221
21371723211
22401722191
23421821181
24441820171
25471819151
26491918141
27501917131
28521916121
29542015110
30562014100

Wind in September

Winds average 9 mph in September.

Across September, daily wind ranges from about 9 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
19light breeze
29light 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
2610light breeze
2710light breeze
2810light breeze
2910light breeze
3010light 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 6:14 AM to 6:36 AM, and sunset from 7:00 PM to 6:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.86:147:00
212.76:156:58
312.76:166:57
412.76:166:56
512.66:176:54
612.66:186:53
712.56:196:51
812.56:196:50
912.56:206:48
1012.46:216:47
1112.46:226:45
1212.46:226:44
1312.36:236:43
1412.36:246:41
1512.36:256:40
1612.26:256:38
1712.26:266:37
1812.16:276:35
1912.16:276:34
2012.16:286:32
2112.06:296:31
2212.06:306:29
2312.06:306:28
2411.96:316:26
2511.96:326:25
2611.86:336:23
2711.86:346:22
2811.86:346:20
2911.76:356:19
3011.76:366:17

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.3 kWh/m².

For context, solar energy here swings from a low near 2.7 kWh/m² to a high of 7.08 kWh/m² in July across the year — September's 5.3 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.8Bright
35.8Bright
45.7Bright
55.7Bright
65.6Bright
75.6Bright
85.5Bright
95.5Bright
105.4Bright
115.4Bright
125.3Bright
135.3Bright
145.3Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.1Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
294.9Bright
304.9Bright
Planning a trip in September

Is September a good time to visit Altus?

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

5.8
Sightseeing
6th-best month of the year
7.6
Beach & pool
1st-best month of the year

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

What to pack for Altus in September

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

In September, Altus sees daytime highs around 86°F and nights near 64°F. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

UV index in Altus in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Altus peaks around July 19 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 19UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar6High
Apr9Very high
May8Very high
Jun10Very high
Jul10Extreme
Aug10Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is Altus?

Altus sits at 34.6°N, 99.3°W, 1,398 ft above sea level, in United States. The nearest listed city is Lawton, 53 mi away.

Topography around Altus

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

Within 2 miles, the terrain around Altus has only modest variations in elevation — a maximum elevation change of 79 ft around an average of 1,381 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 436 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,414 ft.

The land around Altus is covered by cropland (42%), artificial surfaces (28%) and grassland (21%) within 2 miles, cropland (74%) and grassland (21%) within 10 miles, and grassland (55%) and cropland (38%) within 50 miles.

2 miles
79 ft
10 miles
436 ft
50 miles
1,414 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Lawton 53 mi · Wichita Falls 70 mi · Duncan 79 mi · Chickasha 85 mi · El Reno 99 mi · Mustang 104 mi · Yukon 107 mi · Pampa 111 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 Altus (34.6381°, -99.334°, elevation 1,398 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).