Ponce weather in September

In September, Ponce sees average daytime highs of 28°C and overnight lows near 24°C, with 124 mm of rain across 18.9 wet days and about 12.1 hours of daylight. It is the 3rd-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 23% 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 Ponce's 12th-clearest and 10th-windiest month. For the whole year in context, see Ponce's year-round climate.

Daytime high
28°
3rd warmest
Overnight low
24°
11th coldest
Rainfall
124 mm
18.9 wet days
Daylight
12 h 06 min
6:18 AM – 6:24 PM
Cloud cover
65%
12th clearest
Wind
13 km/h
10th windiest
Solar energy
5.87 kWh/m²
Travel score
4.6
out of 10

Ponce is historic district in Ponce, Puerto Rico.

Founded
1646

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 Ponce reaches about 28°C in the afternoon and slips back to 24°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12825
22825
32825
42825
52825
62825
72825
82825
92825
102825
112825
122825
132824
142824
152824
162824
172824
182824
192824
202824
212824
222824
232824
242824
252824
262824
272824
282824
292824
302824

How September really feels in Ponce

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.

Ponce weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 22°227117.5
Feb26° / 22°216.411.47.5
Mar26° / 22°368.811.97.1
Apr27° / 22°5411.912.46.4
May27° / 23°8615.612.85.6
Jun28° / 24°4812.713.15.7
Jul29° / 24°5511.8135.6
Aug29° / 25°7715.412.65.0
Sep28° / 24°12418.912.14.6
Oct28° / 24°10519.611.65.0
Nov27° / 23°7614.411.25.9
Dec26° / 22°287.610.97.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
14753
24753
34753
44852
54852
64951
74951
84852
94852
104753
114753
124753
134654
144654
154654
164555
174456
184456
194258
204159
214159
224060
234159
244060
254060
264060
274060
284159
294159
304159

Chance of precipitation in September

Any precipitation

Ponce gets around 124 mm of rain over 18.9 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 63% and peaks near 68% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
155
255
355
455
556
656
757
858
959
1060
1161
1262
1363
1464
1565
1666
1766
1867
1967
2067
2168
2268
2368
2467
2567
2667
2766
2866
2966
3066

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 (%)
10955
20955
30955
40955
50955
60955
70955
80955
90946
100946
110946
120946
130946
140946
150946
160946
170946
180946
190946
200946
210955
220955
230955
240955
250955
260955
270964
281954
291954
301954

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

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
212.36:166:36
312.36:166:35
412.36:166:34
512.36:166:34
612.36:166:33
712.36:166:32
812.26:176:31
912.26:176:30
1012.26:176:29
1112.26:176:28
1212.26:176:27
1312.26:176:27
1412.16:186:26
1512.16:186:25
1612.16:186:24
1712.16:186:23
1812.16:186:22
1912.06:186:21
2012.06:186:20
2112.06:196:19
2212.06:196:18
2312.06:196:18
2412.06:196:17
2511.96:196:16
2611.96:196:15
2711.96:206:14
2811.96:206:13
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 5.87 kWh/m².

For context, solar energy here swings from a low near 4.52 kWh/m² to a high of 6.64 kWh/m² in June across the year — September's 5.87 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.2Intense
36.1Intense
46.1Intense
56.1Intense
66.1Intense
76.1Intense
86.1Intense
96.0Intense
106.0Intense
116.0Bright
126.0Bright
135.9Bright
145.9Bright
155.9Bright
165.9Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.6Bright
275.6Bright
285.6Bright
295.6Bright
305.6Bright
Planning a trip in September

Hazard calendar for Ponce

In seasonPeak

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

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

Ponce's rainy season runs August–November, when most of the year's rain falls.

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

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

Is September a good time to visit Ponce?

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

4.6
Sightseeing
12th-best month of the year
5.4
Beach & pool
11th-best month of the year

September is a reasonable time to visit Ponce for sightseeing.

What to pack for Ponce in September

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

In September, Ponce sees daytime highs around 28°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

Sea temperature near Ponce 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 15 km away) is warmest in September at about 29°C and coldest in February near 27°C.

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

26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar27Warm
Apr27Warm
May28Warm
Jun28Tropical
Jul28Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Ponce 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 Ponce 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
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep12Extreme
Oct10Very high
Nov8Very high
Dec7Very high

Air quality in Ponce 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 Ponce is worst in July — around 25 µg/m³ PM2.5 (moderate), about 4.8× the cleanest month (January, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1025 µg/m³Jan 15 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb7Good
Mar7Good
Apr8Good
May15Moderate
Jun25Moderate
Jul25Moderate
Aug20Moderate
Sep15Moderate
Oct15Moderate
Nov8Good
Dec5Good
Location & terrain

Where is Ponce?

Ponce sits at 18.0°N, 66.6°W, 15 m above sea level, in Puerto Rico. The nearest listed city is Yauco, 24 km away.

YaucoLa PargueraSan GermánManatíCayeyBarcelonetaAreciboGuayama

Topography around Ponce

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

Within 3 km, the terrain around Ponce has only modest variations in elevation — a maximum elevation change of 178 m around an average of 33 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,046 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,307 m.

The land around Ponce is covered by artificial surfaces (62%) and trees (28%) within 3 km, trees (47%) and water (37%) within 16 km, and water (53%) and trees (37%) within 80 km.

3 km
178 m
16 km
1,046 m
80 km
1,307 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: Yauco 24 km · La Parguera 45 km · San Germán 45 km · Manatí 48 km · Cayey 50 km · Barceloneta 50 km · Arecibo 52 km · Guayama 54 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 Ponce (18.0103°, -66.624°, elevation 15 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).