Brawley weather in September

In September, Brawley sees average daytime highs of 102°F and overnight lows near 75°F, with 0.3 in of rain across 1.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 106°F in the first days to 99°F by the end. The sky is clear or mostly clear about 89% of the time in September, and the air most often feels dry.

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 Brawley's 2nd-clearest and 8th-windiest month. For the whole year in context, see Brawley's year-round climate.

Daytime high
102°
4th warmest
Overnight low
75°
10th coldest
Rainfall
0.3 in
1.4 wet days
Daylight
12 h 12 min
5:30 AM – 5:42 PM
Cloud cover
13%
2nd clearest
Wind
4 mph
8th windiest
Solar energy
6.32 kWh/m²
Travel score
0.8
out of 10

Brawley is city in Imperial County, California, United States.

Density
1,302/km²
people per km²
Founded
1908

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 106°F in the first days to 99°F by the end.

A typical September day in Brawley reaches about 102°F in the afternoon and slips back to 75°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 95°F and 109°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
110680
210680
310680
410580
510579
610579
710579
810478
910478
1010478
1110477
1210377
1310376
1410376
1510276
1610275
1710275
1810274
1910174
2010174
2110173
2210173
2310073
2410072
2510072
269972
279971
289971
299871
309870

How September really feels in Brawley

Once humidity and wind are folded in, September averages 30 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
30
16 feel dangerously hot (≥ 102°F)
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.

Brawley weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan71° / 47°0.41.510.18.4
Feb75° / 50°0.51.810.88.7
Mar82° / 55°0.31.211.77.9
Apr88° / 60°0.10.512.85.9
May96° / 66°0.00.213.73.1
Jun104° / 74°0.00.114.10.4
Jul109° / 81°0.21.6140.0
Aug108° / 82°0.32.613.20.0
Sep102° / 75°0.31.412.20.8
Oct91° / 64°0.20.611.24.8
Nov79° / 54°0.20.610.38.6
Dec70° / 47°0.31.39.98.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 89% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 5% of September, with mostly cloudy or overcast conditions the remaining 6%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1937
2937
3937
4937
5946
6946
7946
8955
9955
10955
11955
12955
13955
14955
15955
16955
17946
18946
19946
20946
21946
22946
23946
24946
25946
26928
27928
28928
29928
30928

Chance of precipitation in September

Any precipitation

Brawley gets around 0.3 in of rain over 1.4 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 5% and peaks near 9% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
19
29
39
49
58
68
78
87
97
106
116
125
135
144
154
164
173
183
193
203
213
222
232
242
252
262
272
282
292
302

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 61% of days. Sticky, muggy-or-worse air turns up on roughly 16% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
140131620101
24112162191
34212162191
44412152080
54611152070
64711151970
74811151960
85011151860
95211151750
105412141550
115512141450
125812131340
135912131240
146212121130
156312121030
16641311930
17671310820
18671310820
1969139720
2069139720
2170138720
2271138710
2372137710
2472137710
2573137610
2674127610
2774127610
2875117610
2976117510
3077107510

Wind in September

Winds average 4 mph in September.

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
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 5:20 AM to 5:40 AM, and sunset from 6:03 PM to 5:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:206:03
212.75:216:02
312.65:226:01
412.65:225:59
512.65:235:58
612.55:245:56
712.55:245:55
812.55:255:54
912.45:265:52
1012.45:265:51
1112.45:275:50
1212.35:285:48
1312.35:285:47
1412.35:295:45
1512.25:305:44
1612.25:305:42
1712.25:315:41
1812.15:325:40
1912.15:325:38
2012.15:335:37
2112.05:345:35
2212.05:345:34
2312.05:355:33
2411.95:365:31
2511.95:375:30
2611.95:375:28
2711.85:385:27
2811.85:395:26
2911.75:395:24
3011.75:405:23

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.32 kWh/m².

For context, solar energy here swings from a low near 3.3 kWh/m² to a high of 8.53 kWh/m² in June across the year — September's 6.32 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.6Intense
46.6Intense
56.6Intense
66.6Intense
76.5Intense
86.5Intense
96.5Intense
106.5Intense
116.5Intense
126.5Intense
136.4Intense
146.4Intense
156.4Intense
166.3Intense
176.3Intense
186.3Intense
196.3Intense
206.2Intense
216.2Intense
226.2Intense
236.1Intense
246.1Intense
256.0Intense
266.0Intense
276.0Bright
285.9Bright
295.9Bright
305.9Bright
Planning a trip in September

Is September a good time to visit Brawley?

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

0.8
Sightseeing
9th-best month of the year
4.0
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Brawley.

What to pack for Brawley in September

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

In September, Brawley sees daytime highs around 102°F and nights near 75°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Brawley 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 Brawley peaks around June 21 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJun 21UV 11Dec 18UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May8Very high
Jun11Extreme
Jul10Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate
Location & terrain

Where is Brawley?

Brawley sits at 33.0°N, 115.5°W, -112 ft above sea level, in United States. The nearest listed city is Imperial, 9.3 mi away.

Topography around Brawley

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

Within 2 miles, the terrain around Brawley has only modest variations in elevation — a maximum elevation change of 92 ft around an average of -121 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 282 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,010 ft.

The land around Brawley is covered by cropland (40%), artificial surfaces (28%) and bare terrain (25%) within 2 miles, cropland (78%) within 10 miles, and bare terrain (68%) within 50 miles.

2 miles
92 ft
10 miles
282 ft
50 miles
6,010 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Imperial 9.3 mi · El Centro 13 mi · Calexico 21 mi · Santa Isabel 24 mi · Mexicali 25 mi · Puebla 30 mi · Ciudad Guadalupe Victoria 54 mi · Somerton 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 Brawley (32.9787°, -115.5303°, elevation -112 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).