Santa Isabel weather in September

In September, Santa Isabel sees average daytime highs of 39°C and overnight lows near 24°C, with 9 mm of rain across 1.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 41°C in the first days to 37°C by the end. The sky is clear or mostly clear about 88% 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 Santa Isabel's 2nd-clearest and 10th-windiest month. For the whole year in context, see Santa Isabel's year-round climate.

Daytime high
39°
4th warmest
Overnight low
24°
10th coldest
Rainfall
9 mm
1.4 wet days
Daylight
12 h 12 min
5:31 AM – 5:43 PM
Cloud cover
14%
2nd clearest
Wind
7 km/h
10th windiest
Solar energy
6.31 kWh/m²
Travel score
0.8
out of 10

Santa Isabel is Baja California.

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 41°C in the first days to 37°C by the end.

A typical September day in Santa Isabel reaches about 39°C in the afternoon and slips back to 24°C overnight — a 15°C spread between the day's warmth and the night's chill. On most days the high lands between 35°C and 43°C. Set against its neighbours, September runs about 3°C cooler than August and about 6°C warmer than October.

20°30°40°151015202530
Avg high (°C)Avg low (°C)
14127
24127
34127
44126
54126
64026
74026
84026
94025
104025
114025
124025
133924
143924
153924
163924
173924
183923
193823
203823
213823
223823
233822
243822
253822
263722
273722
283721
293721
303721

How September really feels in Santa Isabel

Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
30
15 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
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.

Santa Isabel weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 91.710.18.4
Feb24° / 10°12210.88.7
Mar28° / 12°81.111.87.9
Apr31° / 15°30.512.85.8
May36° / 19°10.213.73.1
Jun40° / 23°0014.10.4
Jul43° / 27°51.513.90.0
Aug42° / 28°92.513.20.0
Sep39° / 24°91.412.20.8
Oct33° / 18°50.711.24.8
Nov26° / 12°40.610.38.6
Dec21° / 91.59.98.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 88% of the time in September.

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

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1937
2937
3937
4937
5937
6955
7955
8955
9955
10955
11955
12955
13955
14955
15955
16955
17946
18946
19946
20946
21946
22946
23937
24937
25937
26937
27937
28937
29937
30928

Chance of precipitation in September

Any precipitation

Santa Isabel gets around 9 mm 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.

0%10%20%30%151015202530
Rain chance (%)
19
29
38
48
58
67
77
86
96
106
115
125
135
144
154
164
174
184
194
203
213
223
233
243
253
263
273
283
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 (%)
140121620101
241121620101
342111620101
44311161991
54511161991
64611161891
74711161780
84911161680
95211151480
105411151370
115611141270
125811141160
136011131060
14621113950
15641112850
16661111840
17671111740
18691110730
19691210630
20701210620
2171129620
2272119620
2373118610
2474118610
2574118610
2674118610
2776107610
2876107610
2978107500
307997500

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)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
268calm
278calm
288calm
298calm
308calm

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 5:21 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)
112.75:216:03
212.75:216:02
312.65:226:00
412.65:235:59
512.65:235:58
612.55:245:56
712.55:255:55
812.55:255:54
912.45:265:52
1012.45:275:51
1112.45:275:50
1212.35:285:48
1312.35:295:47
1412.35:295:45
1512.25:305:44
1612.25:315:43
1712.25:315:41
1812.15:325:40
1912.15:335:38
2012.15:335:37
2112.05:345:36
2212.05:355:34
2312.05:355:33
2411.95:365:31
2511.95:375:30
2611.95:375:29
2711.85:385:27
2811.85:395:26
2911.85:395:24
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 6.31 kWh/m².

For context, solar energy here swings from a low near 3.33 kWh/m² to a high of 8.52 kWh/m² in June across the year — September's 6.31 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.7Intense
26.6Intense
36.6Intense
46.6Intense
56.5Intense
66.5Intense
76.5Intense
86.5Intense
96.5Intense
106.5Intense
116.4Intense
126.4Intense
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
286.0Bright
295.9Bright
305.9Bright
Planning a trip in September

Is September a good time to visit Santa Isabel?

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
4.1
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Santa Isabel.

What to pack for Santa Isabel in September

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

In September, Santa Isabel sees daytime highs around 39°C and nights near 24°C. Pack light clothes and sun protection.

light clothessun protection

UV index in Santa Isabel 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 Santa Isabel 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 Santa Isabel?

Santa Isabel sits at 32.6°N, 115.6°W, -8 m above sea level, in Mexico. The nearest listed city is Calexico, 9.0 km away.

Topography around Santa Isabel

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Santa Isabel.

Within 3 km, the terrain around Santa Isabel has only modest variations in elevation — a maximum elevation change of 8 m around an average of 0 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 788 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,962 m.

The land around Santa Isabel is covered by bare terrain (56%) and cropland (21%) within 3 km, bare terrain (48%) and cropland (29%) within 16 km, and bare terrain (53%), shrubs (20%) and cropland (20%) within 80 km.

3 km
8 m
16 km
788 m
80 km
1,962 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Calexico 9.0 km · Mexicali 11 km · El Centro 18 km · Puebla 22 km · Imperial 24 km · Brawley 39 km · Ciudad Guadalupe Victoria 58 km · San Luis 76 km

Mexico travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 / 127 V · 60 Hz
Prices
≈ 54% of US
price level, 2025
GDP per capita
$13,889
2025
Happiness
7.0 / 10
World Happiness, 2025
Safe drinking water
43%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
12.8
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 440
Religion
Catholic 78%no religion 11%other Evangelical Churches 8%Jehovah Witness 1%

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 Santa Isabel (32.6307°, -115.5704°, elevation -8 m), 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).