Sierra Vista weather in September

In September, Sierra Vista sees average daytime highs of 84°F and overnight lows near 62°F, with 1.4 in of rain across 6.1 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 86°F in the first days to 83°F by the end. The sky is clear or mostly clear about 64% 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 Sierra Vista's 7th-clearest and 10th-windiest month. For the whole year in context, see Sierra Vista's year-round climate.

Daytime high
84°
4th warmest
Overnight low
62°
9th coldest
Rainfall
1.4 in
6.1 wet days
Daylight
12 h 12 min
6:10 AM – 6:21 PM
Cloud cover
34%
7th clearest
Wind
5 mph
10th windiest
Solar energy
5.97 kWh/m²
Travel score
6.3
out of 10

Sierra Vista is city in Cochise County, Arizona, United States.

Density
110/km²
people per km²
Founded
1956

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 86°F in the first days to 83°F by the end.

A typical September day in Sierra Vista reaches about 84°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 78°F and 90°F. Set against its neighbours, September runs about 3°F cooler than August and about 7°F warmer than October.

50°60°70°80°90°151015202530
Avg high (°F)Avg low (°F)
18664
28664
38664
48664
58564
68564
78564
88563
98563
108563
118563
128562
138562
148462
158462
168462
178462
188461
198461
208461
218461
228460
238460
248360
258360
268359
278359
288359
298358
308358

How September really feels in Sierra Vista

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.

Sierra Vista weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan59° / 35°0.93.60.610.25.6
Feb62° / 37°0.840.510.86.4
Mar68° / 41°0.52.70.411.87.9
Apr75° / 46°0.21.50.112.78.8
May84° / 53°0.21.6013.67.3
Jun92° / 62°0.42.90144.3
Jul90° / 67°2.712.8013.83.8
Aug87° / 65°2.512.8013.24.6
Sep84° / 62°1.46.1012.26.3
Oct77° / 52°0.52.9011.28.5
Nov67° / 43°0.62.30.110.47.8
Dec58° / 35°0.93.91.1105.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 64% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 17%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17327
27426
37525
47624
57723
67822
77921
88119
98119
108218
118218
128416
138416
148515
158515
168515
178614
188614
198614
208614
218614
228614
238614
248713
258713
268713
278713
288713
298713
308812

Chance of precipitation in September

Any precipitation

Sierra Vista gets around 1.4 in of rain over 6.1 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 21% and peaks near 32% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
132
232
331
431
530
630
729
829
928
1027
1126
1225
1324
1423
1522
1621
1720
1818
1917
2016
2115
2214
2313
2413
2512
2612
2712
2811
2911
3011

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 67% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14630240
24730230
34830220
44930210
55130190
65230180
75330170
85430160
95630140
105829130
115929120
126128110
136128110
146327100
15652690
16662581
17682471
18712261
19722161
20751951
21771751
22791641
23811441
24821341
25841231
26851131
27871030
2889920
2990820
3090820

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
14calm
24calm
34calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 6:01 AM to 6:19 AM, and sunset from 6:41 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:016:41
212.66:016:40
312.66:026:39
412.66:026:37
512.56:036:36
612.56:046:35
712.56:046:33
812.56:056:32
912.46:066:31
1012.46:066:29
1112.46:076:28
1212.36:076:27
1312.36:086:25
1412.36:096:24
1512.26:096:23
1612.26:106:21
1712.26:106:20
1812.16:116:19
1912.16:126:17
2012.16:126:16
2112.06:136:14
2212.06:146:13
2312.06:146:12
2411.96:156:10
2511.96:156:09
2611.96:166:08
2711.86:176:06
2811.86:176:05
2911.86:186:04
3011.76:196:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.97 kWh/m².

For context, solar energy here swings from a low near 3.52 kWh/m² to a high of 8.28 kWh/m² in May across the year — September's 5.97 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.2Intense
46.2Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.0Intense
106.0Intense
116.0Intense
126.0Intense
136.0Bright
146.0Bright
156.0Bright
165.9Bright
175.9Bright
185.9Bright
195.9Bright
205.9Bright
215.9Bright
225.9Bright
235.8Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Is September a good time to visit Sierra Vista?

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

6.3
Sightseeing
7th-best month of the year
7.9
Beach & pool
2nd-best month of the year

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

What to pack for Sierra Vista in September

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

In September, Sierra Vista sees daytime highs around 84°F and nights near 62°F. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Sierra Vista in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sierra Vista peaks around June 22 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 22UV 12Dec 19UV 4
UV index (midday)Level
Jan4Moderate
Feb5High
Mar7High
Apr10Very high
May10Very high
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep10Very high
Oct7Very high
Nov5High
Dec4Moderate
Location & terrain

Where is Sierra Vista?

Sierra Vista sits at 31.6°N, 110.3°W, 4,633 ft above sea level, in United States. The nearest listed city is Cananea, 39 mi away.

Topography around Sierra Vista

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

Within 2 miles, the terrain around Sierra Vista has only modest variations in elevation — a maximum elevation change of 377 ft around an average of 4,646 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,213 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,077 ft.

The land around Sierra Vista is covered by grassland (32%), artificial surfaces (32%) and shrubs (31%) within 2 miles, shrubs (62%) within 10 miles, and shrubs (67%) and grassland (23%) within 50 miles.

2 miles
377 ft
10 miles
5,213 ft
50 miles
7,077 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Cananea 39 mi · Nogales 40 mi · Rio Rico 40 mi · Nogales 41 mi · Vail 42 mi · Green Valley 45 mi · Douglas 47 mi · Sahuarita 47 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 Sierra Vista (31.5545°, -110.3037°, elevation 4,633 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).