Roswell weather in September

In September, Roswell sees average daytime highs of 85°F and overnight lows near 62°F, with 1.6 in of rain across 6.1 wet days and about 12.2 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 88°F in the first days to 82°F by the end. The sky is clear or mostly clear about 67% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Roswell's 3rd-clearest and 7th-windiest month. For the whole year in context, see Roswell's year-round climate.

Daytime high
85°
5th warmest
Overnight low
62°
9th coldest
Rainfall
1.6 in
6.1 wet days
Daylight
12 h 12 min
5:46 AM – 5:59 PM
Cloud cover
32%
3rd clearest
Wind
8 mph
7th windiest
Solar energy
5.8 kWh/m²
Travel score
6.2
out of 10

Roswell is city in and the county seat of Chaves County, New Mexico, United States.

Density
627/km²
people per km²
Founded
1869

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 88°F in the first days to 82°F by the end.

A typical September day in Roswell reaches about 85°F in the afternoon and slips back to 62°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 94°F. Set against its neighbours, September runs about 6°F cooler than August and about 10°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
18966
28966
38866
48865
58765
68765
78764
88764
98664
108664
118663
128563
138563
148562
158562
168562
178461
188461
198461
208460
218460
228360
238360
248359
258359
268358
278358
288258
298257
308257

How September really feels in Roswell

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.

Roswell weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan55° / 31°0.52.61.2104.3
Feb60° / 35°0.52.70.910.86.0
Mar68° / 41°0.83.30.311.77.7
Apr77° / 48°0.82.60.112.88.4
May85° / 58°1.44.8013.76.2
Jun94° / 67°0.95014.23.4
Jul94° / 70°1.46.40143.2
Aug91° / 69°1.57.6013.23.9
Sep85° / 62°1.66.1012.26.2
Oct75° / 50°1.34.30.211.28.2
Nov63° / 38°0.62.60.610.36.8
Dec54° / 31°0.73.11.39.84.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 67% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 19%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18119
28119
38020
48020
58020
68020
77921
87822
97921
107921
117822
127921
137822
147822
157921
167921
178020
188020
198119
208218
218317
228416
238416
248416
258515
268515
278416
288416
298416
308317

Chance of precipitation in September

Any precipitation

Roswell gets around 1.6 in of rain over 6.1 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 21% and peaks near 24% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
121
222
322
423
523
623
723
824
924
1024
1124
1224
1324
1424
1523
1623
1722
1822
1921
2020
2119
2218
2317
2417
2516
2616
2716
2816
2915
3016

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 63% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15328172
25427172
35427172
45427172
55427172
65626171
75427181
85427181
95427181
105427181
115526181
125526181
135626171
145725171
155725171
165924161
176023161
186123151
196322141
206521131
216720121
226919111
237118101
24741691
25761581
26771571
27781471
28801361
29811351
30821251

Wind in September

Winds average 8 mph in September.

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

051015151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light 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 42 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 60 minutes over September. Sunrise moves from 5:36 AM to 5:56 AM, and sunset from 6:20 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:366:20
212.75:376:18
312.75:376:17
412.65:386:16
512.65:396:14
612.65:396:13
712.55:406:11
812.55:416:10
912.55:426:09
1012.45:426:07
1112.45:436:06
1212.35:446:04
1312.35:446:03
1412.35:456:01
1512.25:466:00
1612.25:465:59
1712.25:475:57
1812.15:485:56
1912.15:485:54
2012.15:495:53
2112.05:505:51
2212.05:505:50
2312.05:515:49
2411.95:525:47
2511.95:535:46
2611.85:535:44
2711.85:545:43
2811.85:555:41
2911.75:555:40
3011.75:565:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.8 kWh/m².

For context, solar energy here swings from a low near 3.19 kWh/m² to a high of 7.82 kWh/m² in June across the year — September's 5.8 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.2Intense
36.2Intense
46.2Intense
56.1Intense
66.1Intense
76.0Intense
86.0Bright
95.9Bright
105.9Bright
115.9Bright
125.8Bright
135.8Bright
145.8Bright
155.7Bright
165.7Bright
175.7Bright
185.7Bright
195.7Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.4Bright
305.4Bright
Planning a trip in September

Is September a good time to visit Roswell?

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

6.2
Sightseeing
5th-best month of the year
7.8
Beach & pool
2nd-best month of the year

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

What to pack for Roswell in September

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

In September, Roswell sees daytime highs around 85°F and nights near 62°F. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Roswell in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Roswell peaks around June 23 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 12Dec 20UV 3
UV index (midday)Level
Jan4Moderate
Feb5High
Mar7High
Apr10Extreme
May9Very high
Jun12Extreme
Jul12Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Roswell 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 Roswell is worst in December — around 23 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (August, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateDec 1822 µg/m³Aug 249 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb17Moderate
Mar13Moderate
Apr11Good
May10Good
Jun11Good
Jul10Good
Aug9Good
Sep9Good
Oct9Good
Nov16Moderate
Dec23Moderate
Location & terrain

Where is Roswell?

Roswell sits at 33.4°N, 104.5°W, 3,576 ft above sea level, in United States. The nearest listed city is Carlsbad, 70 mi away.

Topography around Roswell

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

Within 2 miles, the terrain around Roswell has only modest variations in elevation — a maximum elevation change of 95 ft around an average of 3,593 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 719 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,900 ft.

The land around Roswell is covered by artificial surfaces (55%) and grassland (22%) within 2 miles, grassland (72%) within 10 miles, and grassland (91%) within 50 miles.

2 miles
95 ft
10 miles
719 ft
50 miles
6,900 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Carlsbad 70 mi · Alamogordo 90 mi · Hobbs 94 mi · Clovis 103 mi · Las Cruces 150 mi · Horizon City 153 mi · Lubbock 154 mi · Hereford 157 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 Roswell (33.3944°, -104.5249°, elevation 3,576 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).