Chalchuapa weather in September

In September, Chalchuapa sees average daytime highs of 28°C and overnight lows near 19°C, with 321 mm of rain across 26.9 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 28°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels muggy.

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

Daytime high
28°
11th warmest
Overnight low
19°
8th coldest
Rainfall
321 mm
26.9 wet days
Daylight
12 h 06 min
5:51 AM – 5:55 PM
Cloud cover
84%
12th clearest
Wind
4 km/h
12th windiest
Solar energy
5.02 kWh/m²
Travel score
3.5
out of 10

Chalchuapa is district in Western Santa Ana, El Salvador.

Density
195/km²
people per km²

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 28°C through the month.

A typical September day in Chalchuapa reaches about 28°C in the afternoon and slips back to 19°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12919
22919
32819
42819
52819
62819
72819
82819
92819
102819
112819
122819
132819
142819
152819
162819
172819
182819
192819
202819
212819
222819
232819
242819
252819
262819
272819
282819
292719
302719

Chalchuapa 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
Jan28° / 17°31.111.37.6
Feb30° / 17°31.211.56.8
Mar30° / 18°133.911.95.9
Apr30° / 19°5411.112.34.8
May29° / 20°21023.312.63.7
Jun28° / 20°28625.212.83.6
Jul29° / 20°14216.812.74.4
Aug29° / 20°20321.712.53.9
Sep28° / 19°32126.912.13.5
Oct28° / 19°23120.611.74.7
Nov28° / 18°375.811.46.7
Dec28° / 17°9211.27.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 88%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11783
21684
31684
41585
51585
61486
71486
81486
91486
101387
111387
121387
131387
141288
151189
161189
171189
181189
191189
201090
211090
22991
23991
241090
251090
261090
271090
281189
291288
301387

Chance of precipitation in September

Any precipitation

Chalchuapa gets around 321 mm of rain over 26.9 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 89% and peaks near 92% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
186
287
387
487
587
687
787
887
987
1087
1187
1287
1387
1488
1588
1689
1789
1890
1990
2091
2191
2292
2392
2492
2592
2691
2791
2890
2989
3088

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 94% of days. Sticky, muggy-or-worse air turns up on roughly 95% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
110900
29910
38920
48920
57930
67921
77921
86931
96931
106931
116931
126931
135941
145932
155932
165932
174942
184942
194942
203952
213952
223952
232962
242962
252962
262962
272962
282971
293961
303961

Wind in September

Winds average 4 km/h in September, the calmest month.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
255calm
265calm
275calm
285calm
295calm
305calm

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 5:50 AM to 5:51 AM, and sunset from 6:07 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:506:07
212.35:506:06
312.25:506:05
412.25:506:04
512.25:506:04
612.25:506:03
712.25:506:02
812.25:516:01
912.25:516:01
1012.25:516:00
1112.15:515:59
1212.15:515:58
1312.15:515:58
1412.15:515:57
1512.15:515:56
1612.15:515:55
1712.15:515:55
1812.15:515:54
1912.05:515:53
2012.05:515:52
2112.05:515:51
2212.05:515:51
2312.05:515:50
2412.05:515:49
2512.05:515:48
2611.95:515:48
2711.95:515:47
2811.95:515:46
2911.95:515:45
3011.95:515:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.02 kWh/m².

For context, solar energy here swings from a low near 4.83 kWh/m² to a high of 6.42 kWh/m² in March across the year — September's 5.02 kWh/m² sits near the bottom.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.4Bright
45.3Bright
55.3Bright
65.3Bright
75.3Bright
85.3Bright
95.3Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.1Bright
155.1Bright
165.1Bright
175.0Bright
185.0Bright
195.0Bright
204.9Bright
214.9Bright
224.9Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Chalchuapa

In seasonPeak

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

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

Chalchuapa's monsoon runs August–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 Chalchuapa?

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

3.5
Sightseeing
12th-best month of the year
4.0
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Chalchuapa.

What to pack for Chalchuapa in September

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

In September, Chalchuapa sees daytime highs around 28°C and nights near 19°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near Chalchuapa 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 45 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
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Chalchuapa 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 Chalchuapa peaks around April 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 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 13UV 14Nov 23UV 9
UV index (midday)Level
Jan10Very high
Feb13Extreme
Mar13Extreme
Apr14Extreme
May12Extreme
Jun13Extreme
Jul13Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Chalchuapa 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 Chalchuapa is worst in April — around 34 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (January, 16 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 2233 µg/m³Jan 1416 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb17Moderate
Mar21Moderate
Apr34Moderate
May32Moderate
Jun23Moderate
Jul23Moderate
Aug21Moderate
Sep21Moderate
Oct21Moderate
Nov20Moderate
Dec17Moderate
Location & terrain

Where is Chalchuapa?

Chalchuapa sits at 14.0°N, 89.7°W, 710 m above sea level, in El Salvador. The nearest listed city is Santa Ana, 13 km away.

AhuachapanIzalcoSonzacateSonsonateAsunción MitaJalpataguaJutiapa

Topography around Chalchuapa

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

Within 3 km, the terrain around Chalchuapa has significant variations in elevation — a maximum elevation change of 256 m around an average of 721 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,953 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,703 m.

The land around Chalchuapa is covered by trees (44%) and grassland (20%) within 3 km, trees (65%) within 16 km, and trees (48%) and grassland (23%) within 80 km.

3 km
256 m
16 km
1,953 m
80 km
2,703 m
treesshrubsgrasslandcroplandartificial surfaceswater
September weather nearby: Santa Ana 13 km · Ahuachapan 19 km · Izalco 27 km · Sonzacate 28 km · Sonsonate 30 km · Asunción Mita 39 km · Jalpatagua 39 km · Jutiapa 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 Chalchuapa (13.9867°, -89.6811°, elevation 710 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).