Zachary weather in September

In September, Zachary sees average daytime highs of 87°F and overnight lows near 69°F, with 3.8 in of rain across 9.9 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 89°F in the first days to 85°F by the end. The sky is clear or mostly clear about 42% 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 Zachary's 3rd-clearest and 9th-windiest month. For the whole year in context, see Zachary's year-round climate.

Daytime high
87°
4th warmest
Overnight low
69°
9th coldest
Rainfall
3.8 in
9.9 wet days
Daylight
12 h 12 min
5:53 AM – 6:04 PM
Cloud cover
50%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
4.98 kWh/m²
Travel score
4.7
out of 10

Zachary is city in East Baton Rouge Parish, Louisiana, United States.

Density
265/km²
people per km²
Founded
1889

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 85°F by the end.

A typical September day in Zachary reaches about 87°F in the afternoon and slips back to 69°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 93°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)
19072
29072
38972
48971
58971
68971
78971
88971
98971
108971
118970
128870
138870
148870
158870
168869
178869
188769
198769
208768
218768
228768
238667
248667
258667
268566
278566
288565
298565
308465

How September really feels in Zachary

Once humidity and wind are folded in, September averages 19 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
19
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.

Zachary 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° / 42°5.19.610.25.0
Feb64° / 45°4.69.410.95.7
Mar71° / 51°4.810.311.86.6
Apr77° / 57°4.59.212.77.0
May84° / 65°4.09.713.55.6
Jun89° / 72°4.613.413.93.8
Jul90° / 74°4.916.613.83.2
Aug91° / 73°5.015.413.13.2
Sep87° / 69°3.89.912.24.7
Oct79° / 59°3.47.211.27.2
Nov69° / 49°3.78.110.46.9
Dec62° / 44°4.89.310.15.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% 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 40%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
25149
35149
45248
55446
65446
75545
85644
95644
105842
115941
125941
136040
146040
156139
166139
176139
186238
196238
206337
216436
226436
236436
246634
256634
266634
276733
286733
296733
306733

Chance of precipitation in September

Any precipitation

Zachary gets around 3.8 in of rain over 9.9 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
639
738
837
937
1036
1135
1235
1335
1435
1534
1634
1734
1833
1933
2032
2131
2230
2330
2429
2528
2627
2727
2826
2925
3024

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 44% of days. Sticky, muggy-or-worse air turns up on roughly 74% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1146186110
215619609
315719608
416719598
516720597
617720587
727721576
827721576
928822555
1038823535
1138824534
1238924524
1348925504
14481025494
15581026474
16581127464
17681227444
18781228424
19881328404
20981428384
211081428364
221181528344
231381528333
241481627313
251591727303
261691727283
271891826273
2819101825253
2920101825252
3021111824242

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 5:45 AM to 6:02 AM, and sunset from 6:24 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:456:24
212.65:456:23
312.65:466:21
412.65:476:20
512.55:476:19
612.55:486:18
712.55:486:16
812.45:496:15
912.45:496:14
1012.45:506:12
1112.35:516:11
1212.35:516:10
1312.35:526:08
1412.25:526:07
1512.25:536:06
1612.25:536:04
1712.25:546:03
1812.15:556:02
1912.15:556:00
2012.15:565:59
2112.05:565:58
2212.05:575:56
2312.05:585:55
2411.95:585:54
2511.95:595:53
2611.95:595:51
2711.86:005:50
2811.86:015:49
2911.86:015:47
3011.76:025:46

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.98 kWh/m².

For context, solar energy here swings from a low near 2.6 kWh/m² to a high of 6.16 kWh/m² in May across the year — September's 4.98 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.7Bright
304.7Bright
Planning a trip in September

Is September a good time to visit Zachary?

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 Zachary for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Zachary in September

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

In September, Zachary sees daytime highs around 87°F and nights near 69°F. Pack light clothes. Worth having: rain gear and sun protection. About 10 days see rain.

light clothesrain gearsun protection

UV index in Zachary 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 Zachary peaks around July 13 at about 10 (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 highVery highHighModerateJul 13UV 10Dec 20UV 3
UV index (midday)Level
Jan4Moderate
Feb6High
Mar6High
Apr10Very high
May10Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep8Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Zachary 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 Zachary is worst in July — around 24 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (January, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1623 µg/m³Jan 249 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb9Good
Mar11Good
Apr11Good
May15Moderate
Jun19Moderate
Jul24Moderate
Aug18Moderate
Sep13Moderate
Oct12Good
Nov10Good
Dec9Good
Location & terrain

Where is Zachary?

Zachary sits at 30.6°N, 91.2°W, 102 ft above sea level, in United States. The nearest listed city is Central, 9.9 mi away.

Topography around Zachary

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

Within 2 miles, the terrain around Zachary has only modest variations in elevation — a maximum elevation change of 95 ft around an average of 108 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 259 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 535 ft.

The land around Zachary is covered by trees (65%) and grassland (23%) within 2 miles, trees (66%) and grassland (25%) within 10 miles, and trees (75%) within 50 miles.

2 miles
95 ft
10 miles
259 ft
50 miles
535 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: Central 9.9 mi · Baton Rouge 14 mi · Shenandoah 19 mi · Prairieville 26 mi · Hammond 42 mi · Opelousas 55 mi · Laplace 57 mi · Lafayette 59 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 Zachary (30.6485°, -91.1565°, elevation 102 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).