Florence weather in September

In September, Florence sees average daytime highs of 98°F and overnight lows near 74°F, with 0.9 in of rain across 3.1 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 100°F in the first days to 95°F by the end. The sky is clear or mostly clear about 79% 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 Florence's 4th-clearest and 10th-windiest month. For the whole year in context, see Florence's year-round climate.

Daytime high
98°
4th warmest
Overnight low
74°
10th coldest
Rainfall
0.9 in
3.1 wet days
Daylight
12 h 12 min
6:14 AM – 6:26 PM
Cloud cover
23%
4th clearest
Wind
5 mph
10th windiest
Solar energy
6.12 kWh/m²
Travel score
2.2
out of 10

Florence is town in and county seat of Pinal County, Arizona, United States.

Density
192/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 100°F in the first days to 95°F by the end.

A typical September day in Florence reaches about 98°F in the afternoon and slips back to 74°F overnight — a 24°F spread between the day's warmth and the night's chill. On most days the high lands between 90°F and 104°F. Set against its neighbours, September runs about 5°F cooler than August and about 10°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
110178
210078
310078
410078
510077
610077
710077
89976
99976
109976
119976
129975
139875
149875
159874
169874
179874
189774
199773
209773
219773
229772
239672
249672
259671
269671
279571
289570
299570
309469

How September really feels in Florence

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.

Florence 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 daysDaylight (hours)Travel score
Jan66° / 43°1.23.710.17.4
Feb70° / 46°1.34.110.87.6
Mar77° / 51°0.82.911.78.4
Apr84° / 57°0.31.312.87.2
May93° / 65°0.10.613.74.0
Jun102° / 74°0.10.614.10.7
Jul104° / 81°0.84.1140.1
Aug102° / 80°1.14.513.20.6
Sep98° / 74°0.93.112.22.2
Oct88° / 62°0.52.511.25.9
Nov75° / 51°0.62.210.38.5
Dec65° / 43°1.149.97.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 79% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% 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 (%)
18614
28713
38713
48713
58713
68713
78713
88911
98911
108911
118911
129010
139010
149010
159010
169010
17919
18919
19919
20919
219010
229010
239010
249010
259010
269010
279010
288911
298911
308911

Chance of precipitation in September

Any precipitation

Florence gets around 0.9 in of rain over 3.1 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 11% and peaks near 15% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
115
215
315
415
514
614
714
813
913
1013
1112
1212
1312
1411
1511
1610
1710
189
199
208
218
228
237
247
257
267
277
287
297
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 60% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1352322182
2362322172
3372322162
4382421152
5392421142
6402421142
7422420131
8442320121
9462319111
10482318101
1150221891
1252211791
1355201681
1457191581
1558191481
1661181371
1763171271
1865161171
1968151061
207014961
217213861
227313761
237512661
247711651
257811551
267910551
278010541
28819541
29829441
30849430

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 6:04 AM to 6:24 AM, and sunset from 6:47 PM to 6:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:046:47
212.76:046:45
312.66:056:44
412.66:066:43
512.66:066:41
612.56:076:40
712.56:086:39
812.56:086:37
912.46:096:36
1012.46:106:34
1112.46:106:33
1212.36:116:32
1312.36:126:30
1412.36:126:29
1512.26:136:27
1612.26:146:26
1712.26:156:24
1812.16:156:23
1912.16:166:22
2012.16:176:20
2112.06:176:19
2212.06:186:17
2312.06:196:16
2411.96:196:15
2511.96:206:13
2611.96:216:12
2711.86:216:10
2811.86:226:09
2911.76:236:08
3011.76:246:06

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.12 kWh/m².

For context, solar energy here swings from a low near 3.24 kWh/m² to a high of 8.46 kWh/m² in June across the year — September's 6.12 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.4Intense
26.4Intense
36.4Intense
46.4Intense
56.3Intense
66.3Intense
76.3Intense
86.3Intense
96.3Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.2Intense
156.1Intense
166.1Intense
176.1Intense
186.1Intense
196.0Intense
206.0Intense
216.0Intense
226.0Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
275.8Bright
285.8Bright
295.8Bright
305.7Bright
Planning a trip in September

Is September a good time to visit Florence?

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

2.2
Sightseeing
9th-best month of the year
5.6
Beach & pool
6th-best month of the year

September is a weaker month for outdoor sightseeing in Florence.

What to pack for Florence in September

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

In September, Florence sees daytime highs around 98°F and nights near 74°F. Pack light clothes and sun protection. About 3 days see rain.

light clothessun protection

UV index in Florence 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 Florence peaks around June 23 at about 11 (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 11Dec 20UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May9Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Florence 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 Florence is worst in June — around 28 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJun 1626 µg/m³Oct 1212 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar14Moderate
Apr14Moderate
May14Moderate
Jun28Moderate
Jul14Moderate
Aug13Moderate
Sep13Moderate
Oct12Moderate
Nov13Moderate
Dec13Moderate
Location & terrain

Where is Florence?

Florence sits at 33.0°N, 111.4°W, 1,490 ft above sea level, in United States. The nearest listed city is San Tan Valley, 14 mi away.

Topography around Florence

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

Within 2 miles, the terrain around Florence has only modest variations in elevation — a maximum elevation change of 190 ft around an average of 1,503 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 922 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,251 ft.

The land around Florence is covered by bare terrain (47%) within 2 miles, shrubs (40%) and bare terrain (29%) within 10 miles, and shrubs (62%) within 50 miles.

2 miles
190 ft
10 miles
922 ft
50 miles
7,251 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: San Tan Valley 14 mi · Queen Creek 21 mi · Eloy 21 mi · Casa Grande 24 mi · Apache Junction 28 mi · Gilbert 32 mi · Chandler 32 mi · Mesa 37 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 Florence (33.0314°, -111.3873°, elevation 1,490 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).