Manatí weather in September

In September, Manatí sees average daytime highs of 30°C and overnight lows near 25°C, with 140 mm of rain across 21.9 wet days and about 12.1 hours of daylight. It is the 3rd-warmest and 2nd-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 22% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Manatí's 12th-clearest and 11th-windiest month. For the whole year in context, see Manatí's year-round climate.

Daytime high
30°
3rd warmest
Overnight low
25°
11th coldest
Rainfall
140 mm
21.9 wet days
Daylight
12 h 06 min
6:17 AM – 6:23 PM
Cloud cover
66%
12th clearest
Wind
12 km/h
11th windiest
Solar energy
5.8 kWh/m²
Travel score
3.6
out of 10

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 Manatí reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 31°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13025
23025
33025
43025
53025
63025
73025
83025
93025
103025
113025
123025
133025
143025
153025
163025
173025
183025
193025
203025
213025
223025
233025
243025
253025
263025
273025
283025
293025
303025

How September really feels in Manatí

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.

Manatí weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 22°378.7117.0
Feb27° / 22°317.511.47.1
Mar28° / 22°539.511.96.7
Apr28° / 23°941312.45.7
May29° / 24°14117.412.94.6
Jun30° / 25°7713.413.14.5
Jul30° / 25°7214.7134.4
Aug30° / 25°9018.412.64.0
Sep30° / 25°14021.912.13.6
Oct29° / 25°12620.811.64.0
Nov28° / 24°10617.311.15.1
Dec27° / 23°4310.510.96.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 21% of September, with mostly cloudy or overcast conditions the remaining 57%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14555
24555
34555
44555
54555
64456
74456
84555
94555
104456
114456
124456
134357
144357
154357
164258
174159
184159
194060
204060
214060
223961
234159
244060
254159
264060
274159
284258
294357
304357

Chance of precipitation in September

Any precipitation

Manatí gets around 140 mm of rain over 21.9 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 72% and peaks near 75% on the wettest days.

0%20%40%60%80%151015202530
Rain chance (%)
169
269
369
469
569
669
769
870
970
1071
1171
1272
1372
1473
1573
1673
1774
1874
1975
2075
2175
2275
2375
2474
2574
2673
2772
2872
2971
3071

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 64% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16238
26238
36238
46337
56337
66337
76436
86436
96436
106436
116535
126535
136535
146535
156535
166436
176436
186436
196436
206337
216337
226337
236436
246436
256436
266535
276535
286634
296634
306733

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 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 30 minutes over September. Sunrise moves from 6:15 AM to 6:20 AM, and sunset from 6:37 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:156:37
212.36:156:36
312.36:156:35
412.36:156:34
512.36:156:33
612.36:166:32
712.36:166:31
812.26:166:31
912.26:166:30
1012.26:166:29
1112.26:166:28
1212.26:176:27
1312.26:176:26
1412.16:176:25
1512.16:176:24
1612.16:176:23
1712.16:176:22
1812.16:186:22
1912.06:186:21
2012.06:186:20
2112.06:186:19
2212.06:186:18
2312.06:186:17
2412.06:196:16
2511.96:196:15
2611.96:196:14
2711.96:196:13
2811.96:196:13
2911.96:206:12
3011.96:206:11

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.8 kWh/m².

For context, solar energy here swings from a low near 4.36 kWh/m² to a high of 6.55 kWh/m² in June across the year — September's 5.8 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.0Intense
46.0Intense
56.0Intense
66.0Intense
76.0Bright
86.0Bright
96.0Bright
105.9Bright
115.9Bright
125.9Bright
135.9Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.6Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Hazard calendar for Manatí

In seasonPeak

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

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

Manatí sees seasonal dust haze (July), heaviest in July.

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

Is September a good time to visit Manatí?

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

3.6
Sightseeing
12th-best month of the year
4.9
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Manatí.

What to pack for Manatí in September

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

In September, Manatí sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.

light clothesrain gearsun protection

Sea temperature near Manatí in September

The nearest coast averages about 29°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 25 km away) is warmest in September at about 29°C and coldest in February near 26°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb26Warm
Mar26Warm
Apr27Warm
May27Warm
Jun28Tropical
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Manatí 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 Manatí peaks around April 13 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highApr 13UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar12Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Manatí 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 Manatí is worst in July — around 24 µg/m³ PM2.5 (moderate), about 4.8× the cleanest month (January, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1324 µg/m³Jan 105 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb7Good
Mar7Good
Apr8Good
May14Moderate
Jun23Moderate
Jul24Moderate
Aug20Moderate
Sep15Moderate
Oct15Moderate
Nov7Good
Dec5Good
Location & terrain

Where is Manatí?

Manatí sits at 18.4°N, 66.5°W, 33 m above sea level, in Puerto Rico. The nearest listed city is Barceloneta, 6.0 km away.

AreciboCandelariaLevittownBayamónCatañoGuaynabo

Topography around Manatí

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

Within 3 km, the terrain around Manatí has only modest variations in elevation — a maximum elevation change of 202 m around an average of 61 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 443 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,307 m.

The land around Manatí is covered by trees (58%), grassland (21%) and artificial surfaces (20%) within 3 km, trees (53%) and water (27%) within 16 km, and water (50%) and trees (39%) within 80 km.

3 km
202 m
16 km
443 m
80 km
1,307 m
treesgrasslandcroplandartificial surfaceswaterwetland
September weather nearby: Barceloneta 6.0 km · Vega Baja 11 km · Arecibo 24 km · Candelaria 30 km · Levittown 33 km · Bayamón 36 km · Cataño 39 km · Guaynabo 41 km

Puerto Rico travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 78% of US
price level, 2025
GDP per capita
$40,620
2025
Happiness
7.0 / 10
World Happiness, 2015
Safe drinking water
99%
of population, 2024
Homicide rate
14.6
per 100k, 2023
Income group
High
World Bank
Religion
Roman Catholic 56%Protestant 33%none 7%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 Manatí (18.4275°, -66.4921°, elevation 33 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).