Dallas weather in September

In September, Dallas sees average daytime highs of 75°F and overnight lows near 51°F, with 1.5 in of rain across 5 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 78°F in the first days to 71°F by the end. The sky is clear or mostly clear about 52% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Dallas's 3rd-clearest and 12th-windiest month. For the whole year in context, see Dallas's year-round climate.

Daytime high
75°
3rd warmest
Overnight low
51°
10th coldest
Rainfall
1.5 in
5 wet days
Daylight
12 h 18 min
5:58 AM – 6:17 PM
Cloud cover
40%
3rd clearest
Wind
4 mph
12th windiest
Solar energy
4.62 kWh/m²
Travel score
7.9
out of 10

Dallas is county seat of Polk County, Oregon, United States.

Density
1,226/km²
people per km²
Founded
1845

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 78°F in the first days to 71°F by the end.

A typical September day in Dallas reaches about 75°F in the afternoon and slips back to 51°F overnight — a 24°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 87°F. Set against its neighbours, September runs about 6°F cooler than August and about 12°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17954
27953
37853
47853
57853
67853
77853
87753
97753
107753
117752
127652
137652
147652
157552
167551
177551
187451
197451
207451
217450
227350
237350
247350
257249
267249
277149
287149
297149
307048

How September really feels in Dallas

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Dallas weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan47° / 36°6.916.81.891.1
Feb50° / 37°5.314.41.710.11.9
Mar54° / 39°5.916.81.111.62.8
Apr59° / 41°4.315.20.113.23.9
May66° / 46°2.610.1014.66.0
Jun72° / 51°1.56.4015.37.3
Jul80° / 55°0.31.7015.18.1
Aug81° / 55°0.52.4013.98.0
Sep75° / 51°1.55012.37.9
Oct63° / 45°3.910.7010.75.4
Nov51° / 39°6.916.40.39.42.2
Dec46° / 35°8.117.41.78.70.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 35%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17327
27327
37228
47129
57129
67030
76931
86832
96733
106634
116436
126436
136337
146238
156337
166337
176337
186238
196238
206238
216337
226337
236337
246337
256337
266436
276337
286337
296238
306139

Chance of precipitation in September

Any precipitation

Dallas gets around 1.5 in of rain over 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 17% and peaks near 24% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
111
212
312
412
512
612
713
814
915
1015
1116
1217
1317
1418
1518
1618
1719
1819
1919
2019
2120
2220
2320
2420
2521
2621
2721
2822
2923
3024

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 88% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
185150
285150
385150
486140
586140
686140
786140
886140
986140
1087130
1187130
1287130
1387130
1487130
1587130
1687130
1787130
1888120
1988120
2088120
2188111
2288111
2389101
249091
259091
269181
279181
289271
299271
309271

Wind in September

Winds average 4 mph in September, the calmest month.

Across September, daily wind ranges from about 4 mph on the calmest days to 5 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
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 90 minutes over September. Sunrise moves from 5:40 AM to 6:16 AM, and sunset from 6:46 PM to 5:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.15:406:46
213.05:416:44
313.05:426:42
412.95:446:40
512.95:456:38
612.85:466:36
712.85:476:35
812.75:496:33
912.75:506:31
1012.65:516:29
1112.65:526:27
1212.55:536:25
1312.55:556:23
1412.45:566:21
1512.45:576:19
1612.35:586:17
1712.36:006:15
1812.26:016:13
1912.16:026:11
2012.16:036:09
2112.06:056:07
2212.06:066:05
2311.96:076:03
2411.96:086:01
2511.86:105:59
2611.86:115:57
2711.76:125:55
2811.76:135:53
2911.66:155:51
3011.66:165:49

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.62 kWh/m².

For context, solar energy here swings from a low near 1.07 kWh/m² to a high of 7.04 kWh/m² in July across the year — September's 4.62 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.3Bright
35.3Bright
45.2Bright
55.2Bright
65.1Bright
75.1Bright
85.0Bright
95.0Bright
104.9Bright
114.8Bright
124.8Bright
134.7Bright
144.7Bright
154.6Bright
164.5Bright
174.5Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.2Bright
234.1Bright
244.1Bright
254.0Bright
264.0Moderate
273.9Moderate
283.8Moderate
293.8Moderate
303.7Moderate
Planning a trip in September

Hazard calendar for Dallas

In seasonPeak

None of Dallas's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Dallas's rainy season runs October–April, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Dallas?

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

7.9
Sightseeing
3rd-best month of the year
6.5
Beach & pool
3rd-best month of the year

September is one of the better times to visit Dallas for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Dallas in September

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

In September, Dallas sees daytime highs around 75°F and nights near 51°F. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

Sea temperature near Dallas in September

The nearest coast averages about 57°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 40 mi away) is warmest in July at about 57°F and coldest in February near 50°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

50°55°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan50Bracing
Feb50Bracing
Mar50Bracing
Apr51Bracing
May54Bracing
Jun57Bracing
Jul57Bracing
Aug57Bracing
Sep57Bracing
Oct55Bracing
Nov53Bracing
Dec51Bracing

UV index in Dallas in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Dallas peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery highHighModerateLowJul 17UV 8Dec 17UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May8Very high
Jun7High
Jul8Very high
Aug7Very high
Sep5Moderate
Oct4Moderate
Nov1Low
Dec1Low

Air quality in Dallas 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 Dallas is worst in September — around 34 µg/m³ PM2.5 (moderate), about 5.1× the cleanest month (January, 7 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1531 µg/m³Jan 167 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar11Good
Apr11Good
May9Good
Jun8Good
Jul7Good
Aug14Moderate
Sep34Moderate
Oct11Good
Nov10Good
Dec8Good
Location & terrain

Where is Dallas?

Dallas sits at 44.9°N, 123.3°W, 325 ft above sea level, in United States. The nearest listed city is Salem, 14 mi away.

Topography around Dallas

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

Within 2 miles, the terrain around Dallas has only modest variations in elevation — a maximum elevation change of 614 ft around an average of 397 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,657 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,738 ft.

The land around Dallas is covered by trees (49%) and grassland (28%) within 2 miles, trees (52%), cropland (26%) and grassland (20%) within 10 miles, and trees (63%) within 50 miles.

2 miles
614 ft
10 miles
2,657 ft
50 miles
4,738 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Salem 14 mi · Keizer 15 mi · Four Corners 16 mi · Hayesville 17 mi · McMinnville 21 mi · Albany 22 mi · Corvallis 25 mi · Woodburn 27 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 Dallas (44.9193°, -123.317°, elevation 325 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. 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).