Tucson weather in September

In September, Tucson sees average daytime highs of 92°F and overnight lows near 71°F, with 1.0 in of rain across 3.7 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 94°F in the first days to 90°F by the end. The sky is clear or mostly clear about 76% 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 Tucson's 5th-clearest and 10th-windiest month. For the whole year in context, see Tucson's year-round climate.

Daytime high
92°
4th warmest
Overnight low
71°
9th coldest
Rainfall
1.0 in
3.7 wet days
Daylight
12 h 12 min
6:12 AM – 6:24 PM
Cloud cover
26%
5th clearest
Wind
5 mph
10th windiest
Solar energy
6.06 kWh/m²
Travel score
4.0
out of 10

Tucson is city in and county seat of Pima County, Arizona, United States.

Density
906/km²
people per km²
Founded
1775

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 94°F in the first days to 90°F by the end.

A typical September day in Tucson reaches about 92°F in the afternoon and slips back to 71°F overnight — a 22°F spread between the day's warmth and the night's chill. On most days the high lands between 85°F and 99°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)
19574
29474
39474
49474
59474
69473
79473
89473
99373
109372
119372
129372
139372
149371
159371
169271
179271
189271
199270
209270
219270
229269
239169
249169
259168
269168
279168
289167
299067
309066

How September really feels in Tucson

Once humidity and wind are folded in, September averages 30 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
30
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.

Tucson 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 daysDaylight (hours)Travel score
Jan64° / 41°1.1410.17.0
Feb67° / 44°1.13.910.87.3
Mar73° / 49°0.7311.88.4
Apr80° / 55°0.21.412.88.3
May89° / 63°0.10.813.65.5
Jun98° / 72°0.21.214.12.3
Jul98° / 77°1.37.813.92.0
Aug96° / 76°1.37.513.22.5
Sep92° / 71°1.03.712.24.0
Oct84° / 60°0.62.311.27.2
Nov72° / 49°0.72.510.38.4
Dec63° / 41°1.24.29.96.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 76% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 11%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18416
28416
38515
48614
58614
68713
78812
88812
98812
108911
119010
129010
139010
149010
159010
16919
17919
18919
199010
209010
219010
229010
239010
249010
259010
269010
279010
288911
299010
309010

Chance of precipitation in September

Any precipitation

Tucson gets around 1.0 in of rain over 3.7 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 13% and peaks near 21% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
121
220
320
419
519
618
718
817
917
1016
1116
1215
1315
1414
1513
1613
1712
1811
1911
2010
2110
229
239
248
258
268
278
288
298
308

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 59% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
134233013
235232912
336242912
437242811
538252710
640252510
74126249
84326238
94525228
104725217
114925197
125224186
135423176
145622166
155821156
166020146
176319135
186518125
196717115
207015105
21721495
22731395
23761284
24771184
25791074
26801073
2781973
2882963
2983962
3085852

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 6 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
256calm
266calm
276calm
286calm
296calm
306calm

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 6:21 AM, and sunset from 6:44 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:036:44
212.76:036:43
312.66:046:42
412.66:056:40
512.66:056:39
612.56:066:38
712.56:066:36
812.56:076:35
912.46:086:34
1012.46:086:32
1112.46:096:31
1212.36:106:29
1312.36:106:28
1412.36:116:27
1512.26:126:25
1612.26:126:24
1712.26:136:22
1812.16:136:21
1912.16:146:20
2012.16:156:18
2112.06:156:17
2212.06:166:16
2312.06:176:14
2411.96:176:13
2511.96:186:11
2611.96:196:10
2711.86:196:09
2811.86:206:07
2911.86:216:06
3011.76:216:05

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 3.37 kWh/m² to a high of 8.35 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
46.2Intense
56.2Intense
66.2Intense
76.2Intense
86.2Intense
96.2Intense
106.1Intense
116.1Intense
126.1Intense
136.1Intense
146.1Intense
156.1Intense
166.1Intense
176.0Intense
186.0Intense
196.0Intense
206.0Bright
216.0Bright
226.0Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
Planning a trip in September

Is September a good time to visit Tucson?

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

4.0
Sightseeing
9th-best month of the year
7.4
Beach & pool
4th-best month of the year

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

What to pack for Tucson in September

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

In September, Tucson sees daytime highs around 92°F and nights near 71°F. Pack light clothes and sun protection. About 4 days see rain.

light clothessun protection

UV index in Tucson 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 Tucson 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 Tucson 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 Tucson 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 Tucson?

Tucson sits at 32.2°N, 110.9°W, 2,490 ft above sea level, in United States. The nearest listed city is Catalina Foothills, 5.0 mi away.

Topography around Tucson

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

Within 2 miles, the terrain around Tucson has only modest variations in elevation — a maximum elevation change of 157 ft around an average of 2,477 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,455 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,730 ft.

The land around Tucson is covered by artificial surfaces (88%) within 2 miles, artificial surfaces (46%) and shrubs (43%) within 10 miles, and shrubs (80%) within 50 miles.

2 miles
157 ft
10 miles
4,455 ft
50 miles
7,730 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Catalina Foothills 5.0 mi · Flowing Wells 6.8 mi · Casas Adobes 8.1 mi · Drexel Heights 8.1 mi · Tanque Verde 11 mi · Oro Valley 12 mi · Vail 17 mi · Sahuarita 18 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 Tucson (32.2217°, -110.9265°, elevation 2,490 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).