Zacatecoluca weather in September

In September, Zacatecoluca sees average daytime highs of 30°C and overnight lows near 22°C, with 373 mm of rain across 28.2 wet days and about 12.1 hours of daylight. It is the 11th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 6% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Zacatecoluca's 11th-clearest and 10th-windiest month. For the whole year in context, see Zacatecoluca's year-round climate.

Daytime high
30°
11th warmest
Overnight low
22°
7th coldest
Rainfall
373 mm
28.2 wet days
Daylight
12 h 06 min
5:48 AM – 5:52 PM
Cloud cover
81%
11th clearest
Wind
4 km/h
10th windiest
Solar energy
5.37 kWh/m²
Travel score
2.8
out of 10

Zacatecoluca is city in El Salvador.

Density
123/km²
people per km²
Founded
1852

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical September day in Zacatecoluca reaches about 30°C in the afternoon and slips back to 22°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 32°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13022
23022
33022
43022
53022
63022
73022
83022
93022
103022
113022
123022
133022
143022
153022
163022
173022
183022
193022
203022
213022
223022
233022
243022
253022
263022
273022
283022
293022
303022

How September really feels in Zacatecoluca

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
heat index over the day's high
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.

Zacatecoluca weather by month

How September compares with the rest of the year at a glance. September is the 11th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan33° / 20°30.911.34.8
Feb33° / 21°41.211.64.3
Mar34° / 22°154.411.93.8
Apr33° / 23°6413.712.33.2
May32° / 23°2962612.62.7
Jun31° / 23°3262612.82.8
Jul31° / 23°23021.412.73.1
Aug31° / 23°30325.312.42.9
Sep30° / 22°37328.212.12.8
Oct30° / 22°34025.211.73.3
Nov31° / 21°7510.511.44.7
Dec32° / 21°92.111.25.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 83%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12179
22080
31981
41981
51981
61981
71981
82080
92080
101981
111981
121882
131882
141882
151783
161783
171684
181585
191585
201585
211585
221486
231486
241486
251486
261585
271585
281585
291684
301684

Chance of precipitation in September

Any precipitation

Zacatecoluca gets around 373 mm of rain over 28.2 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 93% and peaks near 96% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
190
290
391
491
591
691
791
892
992
1092
1192
1292
1393
1493
1593
1694
1794
1895
1995
2095
2196
2296
2396
2496
2596
2695
2795
2895
2994
3094

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 95% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
10946
20946
30955
40955
50955
60955
70955
80955
90946
100946
110946
120946
130946
140946
150946
160946
170946
180946
190946
200955
210955
220955
230964
240964
250964
260964
270964
281954
291954
301954

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 5:47 AM to 5:48 AM, and sunset from 6:03 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:476:03
212.35:476:02
312.25:476:02
412.25:476:01
512.25:476:00
612.25:476:00
712.25:475:59
812.25:475:58
912.25:475:57
1012.25:475:57
1112.15:485:56
1212.15:485:55
1312.15:485:54
1412.15:485:54
1512.15:485:53
1612.15:485:52
1712.15:485:51
1812.05:485:51
1912.05:485:50
2012.05:485:49
2112.05:485:48
2212.05:485:47
2312.05:485:47
2412.05:485:46
2512.05:485:45
2611.95:485:45
2711.95:485:44
2811.95:485:43
2911.95:485:42
3011.95:485:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.37 kWh/m².

For context, solar energy here swings from a low near 5.03 kWh/m² to a high of 6.51 kWh/m² in March across the year — September's 5.37 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.6Bright
95.6Bright
105.6Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.4Bright
165.4Bright
175.3Bright
185.3Bright
195.3Bright
205.2Bright
215.2Bright
225.2Bright
235.1Bright
245.1Bright
255.1Bright
265.1Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
Planning a trip in September

Hazard calendar for Zacatecoluca

In seasonPeak

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

Zacatecoluca sits in the Atlantic hurricane belt; the season peaks August–October.

Zacatecoluca's monsoon runs May–October, when most of the year's rain falls.

Atlantic hurricane
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Zacatecoluca?

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

2.8
Sightseeing
10th-best month of the year
3.8
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Zacatecoluca.

What to pack for Zacatecoluca in September

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

In September, Zacatecoluca sees daytime highs around 30°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

Sea temperature near Zacatecoluca in September

The nearest coast averages about 30°C 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 31 km away) is warmest in August at about 30°C and coldest in January near 28°C.

The water stays above 20°C all year — warm enough for a swim any month.

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Tropical
Feb28Tropical
Mar29Tropical
Apr29Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Zacatecoluca in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Zacatecoluca peaks around April 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 9 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highApr 10UV 13Dec 13UV 9
UV index (midday)Level
Jan10Very high
Feb13Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Zacatecoluca 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 Zacatecoluca is worst in April — around 34 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (January, 13 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 2234 µg/m³Jan 1113 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb15Moderate
Mar22Moderate
Apr34Moderate
May32Moderate
Jun21Moderate
Jul25Moderate
Aug20Moderate
Sep18Moderate
Oct17Moderate
Nov16Moderate
Dec13Moderate
Location & terrain

Where is Zacatecoluca?

Zacatecoluca sits at 13.5°N, 88.9°W, 220 m above sea level, in El Salvador. The nearest listed city is San Vicente, 17 km away.

San VicenteCojutepequeSan MartínIlopangoSoyapangoSan MarcosSan SalvadorDelgado

Topography around Zacatecoluca

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

Within 3 km, the terrain around Zacatecoluca has significant variations in elevation — a maximum elevation change of 319 m around an average of 210 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,166 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,143 m.

The land around Zacatecoluca is covered by trees (55%) and grassland (26%) within 3 km, trees (44%), grassland (33%) and cropland (20%) within 16 km, and trees (42%), water (28%) and grassland (21%) within 80 km.

3 km
319 m
16 km
2,166 m
80 km
2,143 m
treesshrubsgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: San Vicente 17 km · Cojutepeque 24 km · San Martín 31 km · Ilopango 34 km · Soyapango 37 km · San Marcos 38 km · San Salvador 40 km · Delgado 40 km

El Salvador travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
115 V · 60 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$5,767
2025
Happiness
6.6 / 10
World Happiness, 2025
Homicide rate
7.9
per 100k, 2022
Road deaths
20.9
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 523
Religion
Roman Catholic 44%Protestant 40%none 16%

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 Zacatecoluca (13.5087°, -88.8702°, elevation 220 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. 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).