San Miguel weather in September

In September, San Miguel sees average daytime highs of 31°C and overnight lows near 23°C, with 343 mm of rain across 26.7 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 31°C through the month. The sky is clear or mostly clear about 8% 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 San Miguel's 11th-clearest and 11th-windiest month. For the whole year in context, see San Miguel's year-round climate.

Daytime high
31°
11th warmest
Overnight low
23°
6th coldest
Rainfall
343 mm
26.7 wet days
Daylight
12 h 06 min
5:45 AM – 5:49 PM
Cloud cover
78%
11th clearest
Wind
4 km/h
11th windiest
Solar energy
5.61 kWh/m²
Travel score
2.6
out of 10

San Miguel is city in El Salvador.

Density
416/km²
people per km²
Founded
1530

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 31°C through the month.

A typical September day in San Miguel reaches about 31°C in the afternoon and slips back to 23°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°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)
13223
23223
33223
43223
53223
63223
73223
83223
93223
103223
113123
123123
133123
143123
153123
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273122
283122
293122
303122

How September really feels in San Miguel

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.

San Miguel 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
Jan34° / 21°10.411.34.1
Feb35° / 22°10.311.63.3
Mar36° / 23°92.111.92.8
Apr35° / 24°449.212.32.4
May33° / 24°25822.812.62.3
Jun32° / 23°29123.612.82.6
Jul33° / 23°19518.912.72.8
Aug33° / 23°27122.512.42.6
Sep31° / 23°34326.712.12.6
Oct31° / 22°3042411.73.1
Nov31° / 21°618.811.44.5
Dec33° / 21°61.311.24.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 79%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12674
22674
32674
42575
52575
62575
72476
82476
92476
102377
112377
122377
132377
142278
152179
162179
172080
181981
191981
201882
211783
221783
231783
241783
251783
261783
271783
281882
291882
301981

Chance of precipitation in September

Any precipitation

San Miguel gets around 343 mm of rain over 26.7 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 93% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
182
283
383
484
584
684
785
885
985
1086
1186
1287
1388
1488
1589
1690
1790
1891
1992
2092
2192
2293
2393
2493
2593
2692
2792
2892
2991
3090

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 92% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
12917
21927
31918
41918
50928
60928
70928
80919
90919
100919
110919
120919
130919
140919
150919
160919
170919
180919
190928
200928
210928
220937
230937
240937
250946
260946
270946
280946
291936
301936

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 5:45 AM to 5:45 AM, and sunset from 6:00 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:456:00
212.35:456:00
312.25:455:59
412.25:455:58
512.25:455:57
612.25:455:57
712.25:455:56
812.25:455:55
912.25:455:55
1012.25:455:54
1112.15:455:53
1212.15:455:52
1312.15:455:52
1412.15:455:51
1512.15:455:50
1612.15:455:49
1712.15:455:49
1812.05:455:48
1912.05:455:47
2012.05:455:46
2112.05:455:45
2212.05:455:45
2312.05:455:44
2412.05:455:43
2512.05:455:42
2611.95:455:42
2711.95:455:41
2811.95:455:40
2911.95:455:40
3011.95:455:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.61 kWh/m².

For context, solar energy here swings from a low near 5.17 kWh/m² to a high of 6.68 kWh/m² in March across the year — September's 5.61 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Intense
26.0Bright
36.0Bright
46.0Bright
55.9Bright
65.9Bright
75.9Bright
85.9Bright
95.8Bright
105.8Bright
115.8Bright
125.8Bright
135.7Bright
145.7Bright
155.7Bright
165.6Bright
175.6Bright
185.5Bright
195.5Bright
205.5Bright
215.4Bright
225.4Bright
235.4Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.2Bright
295.2Bright
305.2Bright
Planning a trip in September

Hazard calendar for San Miguel

In seasonPeak

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

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

San Miguel'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 San Miguel?

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

2.6
Sightseeing
8th-best month of the year
3.9
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in San Miguel.

What to pack for San Miguel in September

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

In September, San Miguel sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near San Miguel 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 40 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
Jan28Warm
Feb28Warm
Mar28Tropical
Apr29Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec28Tropical

UV index in San Miguel 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 San Miguel peaks around April 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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 15UV 9
UV index (midday)Level
Jan10Extreme
Feb12Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov10Very high
Dec9Very high

Air quality in San Miguel 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 San Miguel 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 San Miguel?

San Miguel sits at 13.5°N, 88.2°W, 130 m above sea level, in El Salvador. The nearest listed city is San Rafael Oriente, 21 km away.

San Rafael OrienteSan Francisco GoteraSantiago de MaríaUsulutánLa UniónPuerto El TriunfoColomoncaguaLangue

Topography around San Miguel

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

Within 3 km, the terrain around San Miguel has only modest variations in elevation — a maximum elevation change of 126 m around an average of 128 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,078 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,174 m.

The land around San Miguel is covered by artificial surfaces (48%) and trees (36%) within 3 km, trees (51%) and grassland (38%) within 16 km, and trees (45%), water (28%) and grassland (20%) within 80 km.

3 km
126 m
16 km
2,078 m
80 km
2,174 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: San Rafael Oriente 21 km · San Francisco Gotera 25 km · Santiago de María 31 km · Usulután 32 km · La Unión 40 km · Puerto El Triunfo 46 km · Colomoncagua 53 km · Langue 59 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 San Miguel (13.4826°, -88.1821°, elevation 130 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).