Waco weather in September

In September, Waco sees average daytime highs of 89°F and overnight lows near 70°F, with 2.4 in of rain across 6 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 92°F in the first days to 86°F by the end. The sky is clear or mostly clear about 55% of the time in September, and the air most often feels muggy.

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 Waco's 2nd-clearest and 12th-windiest month. For the whole year in context, see Waco's year-round climate.

Daytime high
89°
4th warmest
Overnight low
70°
9th coldest
Rainfall
2.4 in
6 wet days
Daylight
12 h 12 min
6:17 AM – 6:29 PM
Cloud cover
42%
2nd clearest
Wind
7 mph
12th windiest
Solar energy
5.19 kWh/m²
Travel score
4.7
out of 10

Waco is city in and seat of McLennan County, Texas, United States.

Density
505/km²
people per km²
Founded
1849

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 92°F in the first days to 86°F by the end.

A typical September day in Waco reaches about 89°F in the afternoon and slips back to 70°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 80°F and 96°F. Set against its neighbours, September runs about 6°F cooler than August and about 10°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19374
29374
39273
49273
59273
69273
79172
89172
99172
109072
119071
129071
139071
148971
158970
168970
178970
188969
198869
208869
218868
228868
238767
248767
258767
268766
278666
288666
298665
308565

How September really feels in Waco

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.

Waco 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
Jan59° / 40°2.86.910.25.0
Feb63° / 44°2.87.410.85.9
Mar70° / 50°3.5911.86.7
Apr77° / 57°3.48.512.77.1
May84° / 66°4.710.513.65.5
Jun91° / 73°2.98.4143.8
Jul95° / 76°1.45.713.82.8
Aug95° / 76°1.95.313.22.8
Sep89° / 70°2.4612.24.7
Oct80° / 59°4.27.211.27.2
Nov69° / 49°2.97.210.47.0
Dec61° / 42°3.37.1105.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 29%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17327
27129
37129
47129
57030
67030
76931
86832
96733
106733
116733
126634
136634
146634
156634
166634
176733
186832
196832
207030
217129
227327
237426
247426
257624
267624
277723
287723
297723
307624

Chance of precipitation in September

Any precipitation

Waco gets around 2.4 in of rain over 6 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 20% and peaks near 23% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
122
223
323
423
523
623
723
823
923
1023
1123
1223
1323
1422
1522
1621
1721
1820
1919
2019
2118
2217
2317
2416
2516
2616
2716
2816
2916
3016

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 32% of days. Sticky, muggy-or-worse air turns up on roughly 55% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
147204128
248204027
358203927
468213827
568213827
678213727
788213727
888203727
998203627
1098193627
11108193627
12118183627
13118183527
14128183527
15129183426
16139183426
17149183325
181510183225
191611183124
201712183023
211912182922
222113182820
232214182619
242414182518
252515192417
262715192315
272816192314
282916192213
293116192212
303216192112

Wind in September

Winds average 7 mph in September, the calmest month.

Across September, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 6:08 AM to 6:26 AM, and sunset from 6:49 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:086:49
212.66:096:47
312.66:096:46
412.66:106:45
512.56:106:43
612.56:116:42
712.56:126:41
812.56:126:39
912.46:136:38
1012.46:146:37
1112.46:146:35
1212.36:156:34
1312.36:156:33
1412.36:166:31
1512.26:176:30
1612.26:176:29
1712.26:186:27
1812.16:186:26
1912.16:196:25
2012.16:206:23
2112.06:206:22
2212.06:216:20
2312.06:226:19
2411.96:226:18
2511.96:236:16
2611.96:236:15
2711.86:246:14
2811.86:256:12
2911.86:256:11
3011.76:266:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.19 kWh/m².

For context, solar energy here swings from a low near 2.67 kWh/m² to a high of 6.83 kWh/m² in July across the year — September's 5.19 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.5Bright
55.5Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
274.9Bright
284.9Bright
294.9Bright
304.8Bright
Planning a trip in September

Is September a good time to visit Waco?

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
7.3
Beach & pool
1st-best month of the year

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

What to pack for Waco in September

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

In September, Waco sees daytime highs around 89°F and nights near 70°F. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Waco 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 Waco peaks around July 24 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 highExtremeVery highHighModerateJul 24UV 10Dec 20UV 3
UV index (midday)Level
Jan4Moderate
Feb5High
Mar6High
Apr9Very high
May10Very high
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Waco 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 Waco is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (December, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1517 µg/m³Dec 116 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb7Good
Mar10Good
Apr10Good
May14Moderate
Jun15Moderate
Jul18Moderate
Aug13Moderate
Sep10Good
Oct7Good
Nov6Good
Dec6Good
Location & terrain

Where is Waco?

Waco sits at 31.5°N, 97.1°W, 469 ft above sea level, in United States. The nearest listed city is Temple, 34 mi away.

Topography around Waco

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

Within 2 miles, the terrain around Waco has only modest variations in elevation — a maximum elevation change of 236 ft around an average of 476 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 410 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,060 ft.

The land around Waco is covered by artificial surfaces (49%) and trees (38%) within 2 miles, grassland (38%) and trees (29%) within 10 miles, and grassland (53%) and trees (27%) within 50 miles.

2 miles
236 ft
10 miles
410 ft
50 miles
1,060 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Temple 34 mi · Gatesville 36 mi · Belton 39 mi · Harker Heights 44 mi · Killeen 45 mi · Fort Cavazos 47 mi · Copperas Cove 53 mi · Corsicana 55 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 Waco (31.5493°, -97.1467°, elevation 469 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).