Bartow weather in September

In September, Bartow sees average daytime highs of 88°F and overnight lows near 74°F, with 5.4 in of rain across 18 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 88°F through the month. The sky is clear or mostly clear about 23% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Bartow's 10th-clearest and 9th-windiest month. For the whole year in context, see Bartow's year-round climate.

Daytime high
88°
4th warmest
Overnight low
74°
10th coldest
Rainfall
5.4 in
18 wet days
Daylight
12 h 12 min
6:17 AM – 6:27 PM
Cloud cover
66%
10th clearest
Wind
6 mph
9th windiest
Solar energy
4.8 kWh/m²
Travel score
3.6
out of 10

Bartow is county seat of Polk County, Florida, United States.

Density
140/km²
people per km²
Founded
1851

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 88°F through the month.

A typical September day in Bartow reaches about 88°F in the afternoon and slips back to 74°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 84°F and 91°F. Set against its neighbours, September runs about 2°F cooler than August and about 4°F warmer than October.

60°70°80°90°151015202530
Avg high (°F)Avg low (°F)
18975
28975
38975
48975
58975
68975
78975
88875
98874
108874
118874
128874
138874
148874
158874
168874
178874
188874
198874
208874
218773
228773
238773
248773
258773
268773
278773
288773
298772
308672

How September really feels in Bartow

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.

Bartow weather by month

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

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan71° / 51°2.25.610.47.4
Feb74° / 54°1.96.1117.6
Mar78° / 58°2.35.911.87.5
Apr83° / 63°2.16.312.66.5
May88° / 69°2.88.513.44.8
Jun89° / 74°6.419.813.73.1
Jul90° / 75°6.623.113.62.8
Aug90° / 76°6.623.5132.7
Sep88° / 74°5.41812.23.6
Oct84° / 68°2.38.911.35.9
Nov78° / 60°1.44.610.67.8
Dec73° / 55°1.75.110.37.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% 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 58%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23466
33466
43466
53565
63565
73565
83763
93763
103862
113961
123961
134060
144258
154357
164357
174357
184456
194456
204654
214654
224753
234753
244753
254852
264852
274852
284852
294852
304852

Chance of precipitation in September

Any precipitation

Bartow gets around 5.4 in of rain over 18 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 60% and peaks near 71% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
171
270
369
469
568
668
767
866
965
1064
1163
1262
1361
1460
1559
1658
1758
1857
1957
2056
2156
2255
2355
2454
2553
2652
2752
2851
2950
3049

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the oppressive band about 72% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100067618
200067717
300067816
400077716
500077815
600087814
700087913
800097813
9000107812
10000107812
11000117712
12000127612
13000137611
14001147411
15001147411
16001157311
17001167211
18002167111
19002177011
20002177011
21013176811
22013186810
23014186710
2401418689
2502518678
2612519658
2712619657
2813619647
2913720636
3013720636

Wind in September

Winds average 6 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
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over September. Sunrise moves from 6:10 AM to 6:24 AM, and sunset from 6:45 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:106:45
212.66:106:43
312.56:116:42
412.56:116:41
512.56:126:40
612.46:126:39
712.46:126:38
812.46:136:36
912.46:136:35
1012.36:146:34
1112.36:146:33
1212.36:156:31
1312.26:156:30
1412.26:166:29
1512.26:166:28
1612.26:176:27
1712.16:176:25
1812.16:186:24
1912.16:186:23
2012.06:196:22
2112.06:196:20
2212.06:206:19
2312.06:206:18
2411.96:216:17
2511.96:216:16
2611.96:226:14
2711.96:226:13
2811.86:236:12
2911.86:236:11
3011.86:246:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.8 kWh/m².

For context, solar energy here swings from a low near 3.11 kWh/m² to a high of 6.36 kWh/m² in May across the year — September's 4.8 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
94.9Bright
104.9Bright
114.9Bright
124.9Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.6Bright
244.6Bright
254.6Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Bartow

In seasonPeak

In September, Bartow sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.

Bartow sits in the Atlantic hurricane belt; the season peaks August–October.

Bartow's rainy season runs June–September, when most of the year's rain falls.

Atlantic hurricane
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Bartow?

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

3.6
Sightseeing
9th-best month of the year
5.3
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Bartow.

What to pack for Bartow in September

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

In September, Bartow sees daytime highs around 88°F and nights near 74°F. Pack light clothes and rain gear. Worth having: sun protection. About 18 days see rain.

light clothesrain gearsun protection

UV index in Bartow 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 Bartow peaks around July 12 at about 11 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighModerateJul 12UV 11Dec 19UV 4
UV index (midday)Level
Jan5Moderate
Feb7High
Mar9Very high
Apr9Very high
May10Very high
Jun11Extreme
Jul11Extreme
Aug10Very high
Sep9Very high
Oct7Very high
Nov5High
Dec4Moderate

Air quality in Bartow 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 Bartow is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1719 µg/m³Dec 219 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar13Moderate
Apr11Good
May12Good
Jun17Moderate
Jul19Moderate
Aug17Moderate
Sep13Moderate
Oct9Good
Nov9Good
Dec9Good
Location & terrain

Where is Bartow?

Bartow sits at 27.9°N, 81.8°W, 121 ft above sea level, in United States. The nearest listed city is Eloise, 9.3 mi away.

Topography around Bartow

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

Within 2 miles, the terrain around Bartow has only modest variations in elevation — a maximum elevation change of 112 ft around an average of 125 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 302 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 374 ft.

The land around Bartow is covered by trees (58%) and grassland (20%) within 2 miles, trees (49%) and grassland (34%) within 10 miles, and trees (52%) and grassland (31%) within 50 miles.

2 miles
112 ft
10 miles
302 ft
50 miles
374 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Eloise 9.3 mi · Winter Haven 11 mi · Lakeland 12 mi · Auburndale 12 mi · Lake Wales 16 mi · Plant City 19 mi · Haines City 21 mi · Valrico 24 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 Bartow (27.8964°, -81.8431°, elevation 121 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).