Oro Valley weather in September

In September, Oro Valley sees average daytime highs of 90°F and overnight lows near 69°F, with 1.3 in of rain across 4.9 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 92°F in the first days to 88°F by the end. The sky is clear or mostly clear about 74% 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 Oro Valley's 5th-clearest and 10th-windiest month. For the whole year in context, see Oro Valley's year-round climate.

Daytime high
90°
4th warmest
Overnight low
69°
9th coldest
Rainfall
1.3 in
4.9 wet days
Daylight
12 h 12 min
6:12 AM – 6:24 PM
Cloud cover
27%
5th clearest
Wind
5 mph
10th windiest
Solar energy
6.06 kWh/m²
Travel score
4.6
out of 10

Oro Valley is town in Pima County, Arizona, United States.

Density
491/km²
people per km²
Founded
1974

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 92°F in the first days to 88°F by the end.

A typical September day in Oro Valley reaches about 90°F in the afternoon and slips back to 69°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 83°F and 96°F. Set against its neighbours, September runs about 3°F cooler than August and about 9°F warmer than October.

60°70°80°90°100°151015202530
Avg high (°F)Avg low (°F)
19273
29272
39272
49272
59272
69272
79271
89171
99171
109171
119171
129170
139170
149170
159170
169069
179069
189069
199069
209069
219068
228968
238968
248967
258967
268967
278966
288866
298866
308865

How September really feels in Oro Valley

Once humidity and wind are folded in, September averages 21 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
21
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.

Oro Valley 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
Jan61° / 41°1.54.50.510.16.2
Feb64° / 43°1.54.70.410.86.9
Mar71° / 48°0.93.50.211.88.0
Apr78° / 54°0.41.60.112.88.7
May87° / 62°0.21.2013.66.2
Jun96° / 71°0.21.4014.13.1
Jul95° / 76°2.310.4013.92.5
Aug93° / 74°2.111.6013.23.0
Sep90° / 69°1.34.9012.24.6
Oct82° / 59°0.73011.27.8
Nov70° / 48°0.930.110.38.1
Dec61° / 41°1.54.40.29.96.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 74% 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 12%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18317
28317
38317
48416
58515
68614
78614
88812
98812
108812
118911
128911
138911
149010
159010
169010
178911
189010
199010
209010
219010
229010
238911
248911
258911
269010
279010
289010
299010
309010

Chance of precipitation in September

Any precipitation

Oro Valley gets around 1.3 in of rain over 4.9 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 18% and peaks near 29% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
129
228
327
426
525
624
723
822
921
1020
1119
1219
1318
1417
1517
1616
1716
1815
1914
2014
2113
2212
2312
2412
2511
2611
2711
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 60% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
132223114
233233014
335233013
436232912
537232811
639242710
74124269
84324259
94523248
104723227
115023217
125222197
135521186
145721166
155920156
166119146
176318136
186517126
196816115
207015105
21731395
22751285
23761185
24781174
25791074
2680974
2782963
2882963
2985852
3085852

Wind in September

Winds average 5 mph in September.

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

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
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 6:03 AM to 6:22 AM, and sunset from 6:45 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:036:45
212.76:036:43
312.66:046:42
412.66:056:41
512.66:056:39
612.56:066:38
712.56:066:37
812.56:076:35
912.46:086:34
1012.46:086:32
1112.46:096:31
1212.36:106:30
1312.36:106:28
1412.36:116:27
1512.26:126:25
1612.26:126:24
1712.26:136:23
1812.16:146:21
1912.16:146:20
2012.16:156:18
2112.06:166:17
2212.06:166:16
2312.06:176:14
2411.96:186:13
2511.96:186:12
2611.96:196:10
2711.86:206:09
2811.86:206:07
2911.86:216:06
3011.76:226:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.06 kWh/m².

For context, solar energy here swings from a low near 3.32 kWh/m² to a high of 8.36 kWh/m² in June across the year — September's 6.06 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.3Intense
46.3Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.1Intense
166.0Intense
176.0Intense
186.0Intense
196.0Intense
206.0Bright
216.0Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.8Bright
275.8Bright
285.8Bright
295.8Bright
305.7Bright
Planning a trip in September

Is September a good time to visit Oro Valley?

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

4.6
Sightseeing
9th-best month of the year
7.5
Beach & pool
4th-best month of the year

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

What to pack for Oro Valley in September

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

In September, Oro Valley sees daytime highs around 90°F and nights near 69°F. Pack light clothes and sun protection. About 5 days see rain.

light clothessun protection

UV index in Oro Valley 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 Oro Valley peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 23UV 11Dec 20UV 4
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar6High
Apr9Very high
May9Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep10Very high
Oct7High
Nov5Moderate
Dec3Moderate

Air quality in Oro Valley 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 Oro Valley is worst in June — around 15 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 1715 µg/m³Dec 219 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar11Good
Apr12Good
May11Good
Jun15Moderate
Jul12Moderate
Aug11Good
Sep11Good
Oct10Good
Nov10Good
Dec9Good
Location & terrain

Where is Oro Valley?

Oro Valley sits at 32.4°N, 111.0°W, 2,618 ft above sea level, in United States. The nearest listed city is Casas Adobes, 5.0 mi away.

Topography around Oro Valley

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

Within 2 miles, the terrain around Oro Valley has large variations in elevation — a maximum elevation change of 2,694 ft around an average of 2,730 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 6,654 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,854 ft.

The land around Oro Valley is covered by shrubs (60%) and artificial surfaces (32%) within 2 miles, shrubs (66%) and artificial surfaces (24%) within 10 miles, and shrubs (79%) within 50 miles.

2 miles
2,694 ft
10 miles
6,654 ft
50 miles
7,854 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Casas Adobes 5.0 mi · Catalina Foothills 6.8 mi · Flowing Wells 7.5 mi · Tucson 12 mi · Marana 16 mi · Tanque Verde 17 mi · Drexel Heights 17 mi · Vail 28 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 Oro Valley (32.3909°, -110.9665°, elevation 2,618 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).