Hattiesburg weather in September

In September, Hattiesburg sees average daytime highs of 87°F and overnight lows near 68°F, with 3.4 in of rain across 10.3 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 90°F in the first days to 85°F by the end. The sky is clear or mostly clear about 41% of the time in September, and the air most often feels oppressive.

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 Hattiesburg's 3rd-clearest and 9th-windiest month. For the whole year in context, see Hattiesburg's year-round climate.

Daytime high
87°
4th warmest
Overnight low
68°
9th coldest
Rainfall
3.4 in
10.3 wet days
Daylight
12 h 12 min
5:46 AM – 5:57 PM
Cloud cover
51%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
4.92 kWh/m²
Travel score
4.7
out of 10

Hattiesburg is city in Lamar County and Forrest County, Mississippi, United States; county seat of Forrest County, Mississippi.

Density
333/km²
people per km²
Founded
1882

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 90°F in the first days to 85°F by the end.

A typical September day in Hattiesburg reaches about 87°F in the afternoon and slips back to 68°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 94°F. Set against its neighbours, September runs about 3°F cooler than August and about 8°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19071
29071
39071
48970
58970
68970
78970
88970
98969
108969
118969
128869
138869
148869
158868
168868
178768
188767
198767
208767
218767
228666
238666
248666
258565
268565
278564
288564
298464
308463

How September really feels in Hattiesburg

Once humidity and wind are folded in, September averages 18 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
18
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.

Hattiesburg weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan60° / 40°4.49.510.24.8
Feb64° / 43°4.39.410.95.7
Mar70° / 49°4.69.911.86.6
Apr77° / 56°4.08.412.77.1
May84° / 64°4.010.113.65.6
Jun89° / 71°4.513.7143.7
Jul91° / 73°5.117.713.83.1
Aug91° / 72°4.515.813.13.2
Sep87° / 68°3.410.312.24.7
Oct79° / 57°3.36.911.27.3
Nov69° / 47°3.47.810.46.9
Dec62° / 42°4.49.5105.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 41% 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 40%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15248
25248
35446
45446
55545
65644
75644
85743
95743
105842
115941
125941
135941
145941
156040
166040
175941
186040
196040
206139
216139
226238
236238
246337
256436
266436
276535
286634
296634
306634

Chance of precipitation in September

Any precipitation

Hattiesburg gets around 3.4 in of rain over 10.3 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 34% and peaks near 42% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
142
242
341
441
540
640
739
838
938
1037
1136
1236
1336
1435
1535
1635
1735
1834
1934
2033
2132
2231
2330
2429
2528
2627
2726
2825
2924
3023

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 37% of days. Sticky, muggy-or-worse air turns up on roughly 68% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
113928536
223928526
3241028515
4241029505
5241029505
6351129494
7351129484
8361130473
9461230463
10461230453
11471330442
12471330432
13581430422
14581530402
15591530392
16691630372
17691730362
18791730342
198101830322
209101830312
2110101930292
2212111929282
2313111928262
2414112028252
2516122027232
2617122026222
2719132026212
2820132125202
2921132124192
3023142123181

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
255calm
265calm
275calm
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 5:37 AM to 5:55 AM, and sunset from 6:17 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:376:17
212.65:376:16
312.65:386:14
412.65:396:13
512.55:396:12
612.55:406:11
712.55:406:09
812.45:416:08
912.45:426:07
1012.45:426:05
1112.45:436:04
1212.35:436:03
1312.35:446:01
1412.35:456:00
1512.25:455:58
1612.25:465:57
1712.25:465:56
1812.15:475:54
1912.15:485:53
2012.15:485:52
2112.05:495:50
2212.05:505:49
2312.05:505:48
2411.95:515:46
2511.95:515:45
2611.95:525:44
2711.85:535:42
2811.85:535:41
2911.85:545:40
3011.75:555:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.92 kWh/m².

For context, solar energy here swings from a low near 2.59 kWh/m² to a high of 6.15 kWh/m² in May across the year — September's 4.92 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.1Bright
55.1Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.6Bright
304.6Bright
Planning a trip in September

Is September a good time to visit Hattiesburg?

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

4.7
Sightseeing
9th-best month of the year
6.7
Beach & pool
3rd-best month of the year

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

What to pack for Hattiesburg in September

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

In September, Hattiesburg sees daytime highs around 87°F and nights near 68°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Hattiesburg in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hattiesburg peaks around July 10 at about 10 (very high) — 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 highHighModerateJul 10UV 10Dec 20UV 3
UV index (midday)Level
Jan4Moderate
Feb6High
Mar6High
Apr10Very high
May9Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep8Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Hattiesburg 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 Hattiesburg is worst in July — around 22 µg/m³ PM2.5 (moderate), about 3.3× the cleanest month (December, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1621 µg/m³Dec 227 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb10Good
Mar16Moderate
Apr12Moderate
May14Moderate
Jun18Moderate
Jul22Moderate
Aug18Moderate
Sep13Moderate
Oct9Good
Nov8Good
Dec7Good
Location & terrain

Where is Hattiesburg?

Hattiesburg sits at 31.3°N, 89.3°W, 171 ft above sea level, in United States. The nearest listed city is Laurel, 27 mi away.

Topography around Hattiesburg

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

Within 2 miles, the terrain around Hattiesburg has only modest variations in elevation — a maximum elevation change of 128 ft around an average of 167 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 397 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 587 ft.

The land around Hattiesburg is covered by trees (59%) within 2 miles, trees (78%) within 10 miles, and trees (89%) within 50 miles.

2 miles
128 ft
10 miles
397 ft
50 miles
587 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Laurel 27 mi · West Gulfport 65 mi · Gulfport 67 mi · Long Beach 68 mi · Biloxi 69 mi · Ocean Springs 69 mi · Gautier 76 mi · Brandon 77 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 Hattiesburg (31.3271°, -89.2903°, elevation 171 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).