Baytown weather in September

In September, Baytown sees average daytime highs of 88°F and overnight lows near 71°F, with 5.1 in of rain across 12.5 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 1st-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 43% 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 Baytown's 2nd-clearest and 10th-windiest month. For the whole year in context, see Baytown's year-round climate.

Daytime high
88°
4th warmest
Overnight low
71°
9th coldest
Rainfall
5.1 in
12.5 wet days
Daylight
12 h 12 min
6:09 AM – 6:20 PM
Cloud cover
50%
2nd clearest
Wind
6 mph
10th windiest
Solar energy
4.93 kWh/m²
Travel score
4.4
out of 10

Baytown is city in Harris County, Texas, United States.

Density
807/km²
people per km²
Founded
1948

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 Baytown reaches about 88°F in the afternoon and slips back to 71°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 82°F and 93°F. Set against its neighbours, September runs about 4°F cooler than August and about 7°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19074
29074
39074
49074
59074
68974
78973
88973
98973
108973
118973
128973
138872
148872
158872
168872
178871
188771
198771
208771
218770
228770
238769
248669
258669
268668
278668
288568
298567
308567

How September really feels in Baytown

Once humidity and wind are folded in, September averages 23 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
23
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.

Baytown weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan63° / 45°4.31010.35.5
Feb66° / 49°3.48.910.96.1
Mar72° / 55°3.99.611.86.8
Apr78° / 61°3.88.912.76.9
May84° / 69°3.810.413.55.5
Jun89° / 75°4.714.213.93.8
Jul91° / 76°3.91413.73.3
Aug91° / 76°4.514.513.13.1
Sep88° / 71°5.112.512.24.4
Oct81° / 62°4.38.911.36.8
Nov71° / 53°4.38.710.56.9
Dec64° / 47°4.41010.15.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% 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
25347
35347
45446
55446
65545
75545
85545
95644
105644
115644
125644
135644
145743
155842
165842
175941
186040
196139
206238
216436
226535
236634
246733
256931
267030
277129
287129
297129
307129

Chance of precipitation in September

Any precipitation

Baytown gets around 5.1 in of rain over 12.5 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 50% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
150
250
350
450
549
649
749
848
947
1047
1146
1245
1344
1444
1543
1642
1741
1840
1939
2038
2137
2236
2335
2434
2533
2632
2731
2831
2930
3030

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 45% of days. Sticky, muggy-or-worse air turns up on roughly 82% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1015135427
2115145326
3116145325
4116155324
5126165223
6126165322
7126175321
8126175321
9136185220
10236185120
11236185120
12236185120
13246185020
14347194820
15347194819
16347194719
17457194619
18458204518
19558204418
20669204217
21769204116
228610204015
239711203815
2410711213714
2511812213613
2612812213512
2713812223411
2814913223310
291591322329
301691322328

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
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 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 6:01 AM to 6:17 AM, and sunset from 6:38 PM to 6:02 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:016:38
212.66:016:37
312.66:026:36
412.56:026:35
512.56:036:34
612.56:036:32
712.56:046:31
812.46:056:30
912.46:056:29
1012.46:066:27
1112.36:066:26
1212.36:076:25
1312.36:076:23
1412.26:086:22
1512.26:086:21
1612.26:096:20
1712.16:096:18
1812.16:106:17
1912.16:116:16
2012.16:116:14
2112.06:126:13
2212.06:126:12
2312.06:136:10
2411.96:136:09
2511.96:146:08
2611.96:146:07
2711.86:156:05
2811.86:166:04
2911.86:166:03
3011.76:176:02

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.93 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 July across the year — September's 4.93 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.1Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for Baytown

In seasonPeak

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

Baytown 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 Baytown?

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

4.4
Sightseeing
9th-best month of the year
6.4
Beach & pool
4th-best month of the year

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

What to pack for Baytown in September

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

In September, Baytown sees daytime highs around 88°F and nights near 71°F. Pack light clothes. Worth having: rain gear and sun protection. About 13 days see rain.

light clothesrain gearsun protection

Sea temperature near Baytown in September

The nearest coast averages about 84°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 33 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 21 — about 7.6 months when the water holds above 68°F.

60°70°80°90°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan58Bracing
Feb59Cool
Mar64Cool
Apr71Refreshing
May78Warm
Jun83Tropical
Jul85Tropical
Aug86Tropical
Sep84Tropical
Oct78Warm
Nov69Refreshing
Dec62Cool

UV index in Baytown 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 Baytown peaks around July 24 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 24UV 11Dec 20UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr10Very high
May10Extreme
Jun10Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Baytown 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 Baytown is worst in July — around 24 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1523 µg/m³Dec 2010 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb10Good
Mar12Moderate
Apr12Moderate
May16Moderate
Jun20Moderate
Jul24Moderate
Aug18Moderate
Sep15Moderate
Oct11Good
Nov10Good
Dec10Good
Location & terrain

Where is Baytown?

Baytown sits at 29.7°N, 95.0°W, 26 ft above sea level, in United States. The nearest listed city is La Porte, 5.6 mi away.

Topography around Baytown

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

Within 2 miles, the terrain around Baytown has only modest variations in elevation — a maximum elevation change of 66 ft around an average of 26 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 118 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 354 ft.

The land around Baytown is covered by trees (42%) and artificial surfaces (35%) within 2 miles, trees (28%), water (27%) and grassland (21%) within 10 miles, and trees (38%), water (22%) and grassland (20%) within 50 miles.

2 miles
66 ft
10 miles
118 ft
50 miles
354 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: La Porte 5.6 mi · Channelview 8.7 mi · Deer Park 9.3 mi · Cloverleaf 12 mi · Pasadena 14 mi · South Houston 16 mi · League City 17 mi · Dickinson 19 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 Baytown (29.7355°, -94.9774°, elevation 26 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).