Guayaquil weather in September

In September, Guayaquil sees average daytime highs of 27°C and overnight lows near 21°C, with 96 mm of rain across 16.9 wet days and about 12 hours of daylight. It is the 10th-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 27°C through the month. The sky is clear or mostly clear about 4% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Guayaquil's 3rd-clearest and 3rd-windiest month. For the whole year in context, see Guayaquil's year-round climate.

Daytime high
27°
10th warmest
Overnight low
21°
2nd coldest
Rainfall
96 mm
16.9 wet days
Daylight
12 hours
6:14 AM – 6:14 PM
Cloud cover
80%
3rd clearest
Wind
8 km/h
3rd windiest
Solar energy
4.4 kWh/m²
Travel score
5.1
out of 10

Guayaquil is city of Ecuador.

Density
7,684/km²
people per km²
Founded
1534

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 27°C through the month.

A typical September day in Guayaquil reaches about 27°C in the afternoon and slips back to 21°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12721
22721
32721
42721
52721
62721
72721
82721
92721
102721
112721
122721
132721
142721
152721
162721
172721
182721
192721
202721
212721
222721
232721
242721
252721
262721
272721
282721
292721
302721

How September really feels in Guayaquil

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Guayaquil weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 23°24923.312.13.7
Feb29° / 24°37825.912.13.0
Mar29° / 24°39426.1123.2
Apr29° / 24°31824.6123.3
May29° / 23°22924.111.93.6
Jun28° / 22°14720.811.94.5
Jul27° / 21°11918.911.95.0
Aug27° / 21°8415.711.95.4
Sep27° / 21°9616.9125.1
Oct27° / 21°7013.9125.5
Nov28° / 21°539.512.15.7
Dec29° / 22°12014.312.14.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 84%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11981
21981
32179
42179
52179
62179
72278
82278
92278
102080
111981
121981
131981
141882
151783
161684
171684
181486
191486
201486
211387
221288
231189
241189
251189
261090
271090
281090
291090
301090

Chance of precipitation in September

Any precipitation

Guayaquil gets around 96 mm of rain over 16.9 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 56% and peaks near 58% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
155
255
356
456
556
657
757
857
958
1058
1158
1258
1358
1458
1558
1658
1758
1858
1958
2057
2157
2256
2355
2454
2554
2653
2753
2852
2952
3052

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 88% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)
11927
21927
31927
41927
51927
61927
72908
82908
92908
102899
112899
1228810
1328810
1428711
1528711
1628612
1728612
1828513
1928513
2018613
2118613
2218613
2318613
2418613
2518613
2618712
2718712
2818712
2918811
3018811

Wind in September

Winds average 8 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
309calm

Sunrise & sunset in September

DaylightNight

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

Days grow by about 0 minutes over September. Sunrise moves from 6:21 AM to 6:08 AM, and sunset from 6:18 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:216:18
212.06:206:18
312.06:206:17
412.06:196:17
512.06:196:17
612.06:196:17
712.06:186:16
812.06:186:16
912.06:176:16
1012.06:176:15
1112.06:166:15
1212.06:166:15
1312.06:166:14
1412.06:156:14
1512.06:156:14
1612.06:146:14
1712.06:146:13
1812.06:136:13
1912.06:136:13
2012.06:126:12
2112.06:126:12
2212.06:126:12
2312.06:116:11
2412.06:116:11
2512.06:106:11
2612.06:106:10
2712.06:106:10
2812.06:096:10
2912.06:096:10
3012.06:086:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.4 kWh/m².

For context, solar energy here swings from a low near 3.49 kWh/m² to a high of 4.5 kWh/m² in November across the year — September's 4.4 kWh/m² sits near the top of that range.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Guayaquil

In seasonPeak

None of Guayaquil's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Guayaquil's rainy season runs January–May, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Guayaquil?

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

5.1
Sightseeing
4th-best month of the year
5.3
Beach & pool
5th-best month of the year

September is a reasonable time to visit Guayaquil for sightseeing.

What to pack for Guayaquil in September

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

In September, Guayaquil sees daytime highs around 27°C and nights near 21°C. Pack light clothes and rain gear. About 17 days see rain.

light clothesrain gear

Sea temperature near Guayaquil in September

The nearest coast averages about 23°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 55 km away) is warmest in March at about 27°C and coldest in September near 23°C.

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

22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb27Warm
Mar27Warm
Apr26Warm
May26Warm
Jun25Warm
Jul24Refreshing
Aug23Refreshing
Sep23Refreshing
Oct23Refreshing
Nov24Refreshing
Dec25Warm

UV index in Guayaquil in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Guayaquil peaks around March 11 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 14 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 11UV 15Jul 14UV 10
UV index (midday)Level
Jan14Extreme
Feb14Extreme
Mar15Extreme
Apr12Extreme
May12Extreme
Jun10Extreme
Jul10Very high
Aug11Extreme
Sep11Extreme
Oct13Extreme
Nov11Extreme
Dec11Extreme

Air quality in Guayaquil 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 Guayaquil is worst in March — around 21 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (August, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateMar 1621 µg/m³Aug 179 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb19Moderate
Mar21Moderate
Apr19Moderate
May15Moderate
Jun12Moderate
Jul10Good
Aug9Good
Sep10Good
Oct14Moderate
Nov18Moderate
Dec18Moderate
Location & terrain

Where is Guayaquil?

Guayaquil sits at 2.2°S, 79.9°W, 14 m above sea level, in Ecuador. The nearest listed city is Eloy Alfaro, 6.0 km away.

Topography around Guayaquil

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

Within 3 km, the terrain around Guayaquil has only modest variations in elevation — a maximum elevation change of 86 m around an average of 6 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 463 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,581 m.

The land around Guayaquil is covered by artificial surfaces (58%) and water (27%) within 3 km, water (28%) and artificial surfaces (26%) within 16 km, and trees (37%) and grassland (24%) within 80 km.

3 km
86 m
16 km
463 m
80 km
3,581 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Eloy Alfaro 6.0 km · Yaguachi Nuevo 24 km · El Triunfo 31 km · Samborondón 32 km · Milagro 33 km · Daule 39 km · Naranjito 47 km · Pedro Carbo 57 km

Ecuador travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 43% of US
price level, 2025
GDP per capita
$7,125
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
70%
of population, 2024
Homicide rate
45.7
per 100k, 2023
Road deaths
20.1
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 466
Religion
Roman Catholic 68%Protestant 19%none 8%other 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 Guayaquil (-2.1962°, -79.8862°, elevation 14 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. 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).