Hammond weather in September

In September, Hammond sees average daytime highs of 87°F and overnight lows near 69°F, with 4.4 in of rain across 11.5 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 89°F in the first days to 84°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 36 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Hammond's 4th-clearest and 9th-windiest month. For the whole year in context, see Hammond's year-round climate.

Daytime high
87°
4th warmest
Overnight low
69°
9th coldest
Rainfall
4.4 in
11.5 wet days
Daylight
12 h 12 min
5:51 AM – 6:02 PM
Cloud cover
51%
4th clearest
Wind
5 mph
9th windiest
Solar energy
4.91 kWh/m²
Travel score
4.6
out of 10

Hammond is city in Tangipahoa Parish, Louisiana, United States.

Density
564/km²
people per km²
Founded
1818

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 89°F in the first days to 84°F by the end.

A typical September day in Hammond reaches about 87°F in the afternoon and slips back to 69°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 92°F. Set against its neighbours, September runs about 3°F cooler than August and about 8°F warmer than October.

50°60°70°80°90°151015202530
Avg high (°F)Avg low (°F)
18972
28972
38972
48972
58972
68971
78871
88871
98871
108871
118871
128871
138870
148770
158770
168770
178769
188769
198769
208669
218668
228668
238668
248567
258567
268567
278566
288466
298465
308465

How September really feels in Hammond

Once humidity and wind are folded in, September averages 20 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
20
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.

Hammond weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan61° / 43°4.79.510.35.2
Feb65° / 46°4.69.410.95.9
Mar71° / 52°4.910.311.86.6
Apr77° / 58°4.69.712.76.9
May84° / 66°4.410.113.55.7
Jun89° / 72°5.31513.93.8
Jul90° / 74°5.918.613.83.1
Aug90° / 73°6.017.513.13.2
Sep87° / 69°4.411.512.24.6
Oct79° / 59°3.78.111.37.1
Nov70° / 49°3.67.810.57.0
Dec63° / 45°4.29.410.15.7

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 18% of September, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15149
25248
35347
45446
55545
65545
75644
85743
95842
105842
115941
125941
136040
146040
156040
166040
176040
186040
196040
206040
216139
226139
236337
246337
256337
266436
276436
286535
296634
306634

Chance of precipitation in September

Any precipitation

Hammond gets around 4.4 in of rain over 11.5 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 39% and peaks near 49% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
149
248
347
447
546
645
745
844
943
1042
1141
1241
1340
1440
1539
1639
1738
1838
1937
2036
2135
2234
2333
2432
2531
2631
2730
2829
2929
3028

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 47% of days. Sticky, muggy-or-worse air turns up on roughly 79% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1116156017
2116156116
3126156115
4127166014
5127175914
6137175913
7137185813
8237195712
9237205711
10247205611
11247215511
12348225310
13348235210
14348245110
15448254910
16449254810
17549264610
185510274410
19651027439
20751027419
21851127408
221061127388
231161227377
241261227367
251371326346
261571326336
271681325326
281781425315
291891424305
3019101424294

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 36 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 54 minutes over September. Sunrise moves from 5:42 AM to 5:59 AM, and sunset from 6:21 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:426:21
212.65:436:20
312.65:436:19
412.65:446:17
512.55:446:16
612.55:456:15
712.55:466:13
812.45:466:12
912.45:476:11
1012.45:476:10
1112.35:486:08
1212.35:486:07
1312.35:496:06
1412.25:506:04
1512.25:506:03
1612.25:516:02
1712.25:516:00
1812.15:525:59
1912.15:525:58
2012.15:535:56
2112.05:545:55
2212.05:545:54
2312.05:555:52
2411.95:555:51
2511.95:565:50
2611.95:575:48
2711.85:575:47
2811.85:585:46
2911.85:585:45
3011.75:595:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.91 kWh/m².

For context, solar energy here swings from a low near 2.65 kWh/m² to a high of 6.17 kWh/m² in May across the year — September's 4.91 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.9Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Hammond

In seasonPeak

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

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

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

Is September a good time to visit Hammond?

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
6.6
Beach & pool
3rd-best month of the year

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

What to pack for Hammond in September

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

In September, Hammond sees daytime highs around 87°F and nights near 69°F. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

Sea temperature near Hammond in September

The nearest coast averages about 83°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 22 mi away) is warmest in August at about 86°F and coldest in January near 58°F.

It's comfortable for a long swim from Apr 4 to Nov 14 — about 7.4 months when the water holds above 68°F.

60°70°80°90°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan58Bracing
Feb58Bracing
Mar64Cool
Apr71Refreshing
May78Warm
Jun84Tropical
Jul86Tropical
Aug86Tropical
Sep83Tropical
Oct76Warm
Nov68Cool
Dec62Cool

UV index in Hammond 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 Hammond peaks around July 12 at about 10 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 12UV 10Dec 19UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr10Very high
May10Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep9Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Hammond 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 Hammond is worst in July — around 24 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (January, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1623 µg/m³Jan 118 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar12Good
Apr12Good
May15Moderate
Jun19Moderate
Jul24Moderate
Aug19Moderate
Sep14Moderate
Oct11Good
Nov9Good
Dec8Good
Location & terrain

Where is Hammond?

Hammond sits at 30.5°N, 90.5°W, 43 ft above sea level, in United States. The nearest listed city is Laplace, 30 mi away.

Topography around Hammond

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

Within 2 miles, the terrain around Hammond has only modest variations in elevation — a maximum elevation change of 92 ft around an average of 49 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 197 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 525 ft.

The land around Hammond is covered by trees (61%) and artificial surfaces (20%) within 2 miles, trees (76%) within 10 miles, and trees (67%) within 50 miles.

2 miles
92 ft
10 miles
197 ft
50 miles
525 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Laplace 30 mi · Shenandoah 33 mi · Prairieville 34 mi · Central 34 mi · Kenner 38 mi · Metairie 40 mi · Metairie Terrace 40 mi · Zachary 42 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 Hammond (30.5046°, -90.4629°, elevation 43 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). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).