Puerto Rico weather in September

In September, Puerto Rico sees average daytime highs of 25°C and overnight lows near 16°C, with 90 mm of rain across 21 wet days and about 12 hours of daylight. It is the 7th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 6% of the time in September, and the air most often feels humid.

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 Puerto Rico's 5th-clearest and 4th-windiest month. For the whole year in context, see Puerto Rico's year-round climate.

Daytime high: 25°; 7th warmest
Overnight low: 16°; 3rd coldest
Rainfall: 90 mm; 21 wet days
Daylight: 12 hours; 5:55 AM – 5:55 PM
Cloud cover: 76%; 5th clearest
Wind: 4 km/h; 4th windiest
Solar energy: 5.48 kWh/m²
Travel score: 4.9; out of 10

Puerto Rico is capital of Puerto Rico municipality, Caquetá Department, Colombia.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Puerto Rico year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 25°C through the month.

A typical September day in Puerto Rico reaches about 25°C in the afternoon and slips back to 16°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 27°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25
Avg low (°C)	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16

	Avg high (°C)	Avg low (°C)
1	25	16
2	25	16
3	25	16
4	25	16
5	25	16
6	25	16
7	25	16
8	25	16
9	25	16
10	25	16
11	25	16
12	25	16
13	25	16
14	25	16
15	25	16
16	25	16
17	25	16
18	25	16
19	25	16
20	25	16
21	25	16
22	25	16
23	25	16
24	25	16
25	25	16
26	25	16
27	25	16
28	25	16
29	25	16
30	25	16

Puerto Rico weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	26° / 16°	80	12.8	11.9	6.0
Feb	26° / 17°	101	14.7	11.9	5.4
Mar	26° / 17°	175	24.1	12	4.3
Apr	25° / 17°	200	27.1	12	3.9
May	24° / 17°	195	27.7	12.1	4.0
Jun	23° / 16°	181	25.9	12.1	4.0
Jul	23° / 16°	168	25.3	12.1	4.3
Aug	24° / 16°	100	20.3	12.1	5.1
Sep	25° / 16°	90	21	12	4.9
Oct	25° / 16°	166	24.3	12	4.3
Nov	26° / 17°	226	26	11.9	4.0
Dec	26° / 16°	141	19.2	11.9	5.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 77%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	28	27	26	26	26	26	25	25	25	24	24	23	23	22	22	21	21	21	21	21	20	20	20	20	20	19	19	18	18	18
Cloudier (%)	72	73	74	74	74	74	75	75	75	76	76	77	77	78	78	79	79	79	79	79	80	80	80	80	80	81	81	82	82	82

	Clearer (%)	Cloudier (%)
1	28	72
2	27	73
3	26	74
4	26	74
5	26	74
6	26	74
7	25	75
8	25	75
9	25	75
10	24	76
11	24	76
12	23	77
13	23	77
14	22	78
15	22	78
16	21	79
17	21	79
18	21	79
19	21	79
20	21	79
21	20	80
22	20	80
23	20	80
24	20	80
25	20	80
26	19	81
27	19	81
28	18	82
29	18	82
30	18	82

Chance of precipitation in September

Any precipitation

Puerto Rico gets around 90 mm of rain over 21 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 70% and peaks near 74% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	65	65	65	66	66	66	67	67	68	68	68	69	69	69	69	70	70	70	71	71	71	72	72	73	73	73	73	74	74	74

	Rain chance (%)
1	65
2	65
3	65
4	66
5	66
6	66
7	67
8	67
9	68
10	68
11	68
12	69
13	69
14	69
15	69
16	70
17	70
18	70
19	71
20	71
21	71
22	72
23	72
24	73
25	73
26	73
27	73
28	74
29	74
30	74

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the humid band about 74% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Comfortable (%)	34	34	34	33	33	32	32	31	30	29	28	27	26	25	24	24	23	22	21	21	20	20	20	20	19	19	19	20	20	20
Humid (%)	66	66	66	67	67	68	68	69	70	71	72	73	74	75	76	76	77	78	79	79	80	80	80	80	80	80	80	79	79	79
Muggy (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1

	Comfortable (%)	Humid (%)	Muggy (%)
1	34	66	0
2	34	66	0
3	34	66	0
4	33	67	0
5	33	67	0
6	32	68	0
7	32	68	0
8	31	69	0
9	30	70	0
10	29	71	0
11	28	72	0
12	27	73	0
13	26	74	0
14	25	75	0
15	24	76	0
16	24	76	0
17	23	77	0
18	22	78	0
19	21	79	0
20	21	79	0
21	20	80	0
22	20	80	0
23	20	80	0
24	20	80	0
25	19	80	1
26	19	80	1
27	19	80	1
28	20	79	1
29	20	79	1
30	20	79	1

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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm

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 5:59 AM to 5:50 AM, and sunset from 6:01 PM to 5:50 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	5:59	5:59	5:59	5:58	5:58	5:58	5:57	5:57	5:57	5:57	5:56	5:56	5:56	5:55	5:55	5:55	5:54	5:54	5:54	5:53	5:53	5:53	5:52	5:52	5:52	5:52	5:51	5:51	5:51	5:50
Sunset (PM)	6:01	6:01	6:01	6:00	6:00	5:59	5:59	5:59	5:58	5:58	5:57	5:57	5:57	5:56	5:56	5:55	5:55	5:54	5:54	5:54	5:53	5:53	5:52	5:52	5:51	5:51	5:51	5:50	5:50	5:50

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.0	5:59	6:01
2	12.0	5:59	6:01
3	12.0	5:59	6:01
4	12.0	5:58	6:00
5	12.0	5:58	6:00
6	12.0	5:58	5:59
7	12.0	5:57	5:59
8	12.0	5:57	5:59
9	12.0	5:57	5:58
10	12.0	5:57	5:58
11	12.0	5:56	5:57
12	12.0	5:56	5:57
13	12.0	5:56	5:57
14	12.0	5:55	5:56
15	12.0	5:55	5:56
16	12.0	5:55	5:55
17	12.0	5:54	5:55
18	12.0	5:54	5:54
19	12.0	5:54	5:54
20	12.0	5:53	5:54
21	12.0	5:53	5:53
22	12.0	5:53	5:53
23	12.0	5:52	5:52
24	12.0	5:52	5:52
25	12.0	5:52	5:51
26	12.0	5:52	5:51
27	12.0	5:51	5:51
28	12.0	5:51	5:50
29	12.0	5:51	5:50
30	12.0	5:50	5:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.48 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.95 kWh/m² to a high of 5.48 kWh/m² in September across the year — September's 5.48 kWh/m² sits near the top of that range.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	5.3	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.4	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	5.3	Bright
2	5.4	Bright
3	5.4	Bright
4	5.4	Bright
5	5.4	Bright
6	5.4	Bright
7	5.4	Bright
8	5.4	Bright
9	5.4	Bright
10	5.4	Bright
11	5.4	Bright
12	5.5	Bright
13	5.5	Bright
14	5.5	Bright
15	5.5	Bright
16	5.5	Bright
17	5.5	Bright
18	5.5	Bright
19	5.5	Bright
20	5.5	Bright
21	5.5	Bright
22	5.5	Bright
23	5.5	Bright
24	5.5	Bright
25	5.5	Bright
26	5.5	Bright
27	5.5	Bright
28	5.5	Bright
29	5.5	Bright
30	5.5	Bright

Planning a trip in September

Is September a good time to visit Puerto Rico?

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

4.9

Sightseeing

5th-best month of the year

4.4

Beach & pool

4th-best month of the year

September is a reasonable time to visit Puerto Rico for sightseeing.

What to pack for Puerto Rico in September

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

In September, Puerto Rico sees daytime highs around 25°C and nights near 16°C. Pack rain gear. Worth having: light clothes and sun protection. About 21 days see rain.

rain gearlight clothessun protection

UV index in Puerto Rico in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Puerto Rico peaks around February 13 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 at about 11 (extreme).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	14	15	14	13	14	13	12	11	14	13	12	11
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	15	Extreme
Mar	14	Extreme
Apr	13	Extreme
May	14	Extreme
Jun	13	Extreme
Jul	12	Extreme
Aug	11	Extreme
Sep	14	Extreme
Oct	13	Extreme
Nov	12	Extreme
Dec	11	Extreme

Air quality in Puerto Rico 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 Puerto Rico is worst in February — around 54 µg/m³ PM2.5 (poor), about 5.3× the cleanest month (July, 10 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	23	54	29	19	13	11	10	13	14	13	13	13
Level	Moderate	Poor	Moderate	Moderate	Moderate	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	23	Moderate
Feb	54	Poor
Mar	29	Moderate
Apr	19	Moderate
May	13	Moderate
Jun	11	Good
Jul	10	Good
Aug	13	Moderate
Sep	14	Moderate
Oct	13	Moderate
Nov	13	Moderate
Dec	13	Moderate

Location & terrain

Where is Puerto Rico?

Puerto Rico sits at 1.9°N, 75.2°W, 259 m above sea level, in Colombia. The nearest listed city is El Doncello, 29 km away.

Topography around Puerto Rico

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

Within 3 km, the terrain around Puerto Rico has only modest variations in elevation — a maximum elevation change of 240 m around an average of 266 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,995 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,253 m.

The land around Puerto Rico is covered by grassland (60%) and trees (33%) within 3 km, trees (58%) and grassland (41%) within 16 km, and trees (57%) and grassland (42%) within 80 km.

3 km

240 m

grassland 60%

16 km

1,995 m

trees 58%

80 km

3,253 m

trees 57%

treesgrasslandartificial surfaceswater

← August Puerto Rico year-round climate October →Best places to visit in September

September weather nearby: El Doncello 29 km · Florencia 59 km · Garzón 61 km · Guadalupe 68 km · Gigante 68 km · Tarqui 77 km · Campoalegre 88 km · Rivera 97 km

Colombia travel facts

Travel advisory: Level 3; Reconsider Travel
Power plugs: Type A / B; 120 / 240 V · 60 Hz
Prices: ≈ 38% of US; price level, 2025
GDP per capita: $8,562; 2025
Happiness: 6.0 / 10; World Happiness, 2025
Safe drinking water: 74%; of population, 2024
Homicide rate: 24.9; per 100k, 2023
Road deaths: 15.4; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Low; EF EPI 480
Religion

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 Puerto Rico (1.91°, -75.1593°, elevation 259 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. 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).

	Avg high (°C)	Avg low (°C)
1	25	16
2	25	16
3	25	16
4	25	16
5	25	16
6	25	16
7	25	16
8	25	16
9	25	16
10	25	16
11	25	16
12	25	16
13	25	16
14	25	16
15	25	16
16	25	16
17	25	16
18	25	16
19	25	16
20	25	16
21	25	16
22	25	16
23	25	16
24	25	16
25	25	16
26	25	16
27	25	16
28	25	16
29	25	16
30	25	16

	Clearer (%)	Cloudier (%)
1	28	72
2	27	73
3	26	74
4	26	74
5	26	74
6	26	74
7	25	75
8	25	75
9	25	75
10	24	76
11	24	76
12	23	77
13	23	77
14	22	78
15	22	78
16	21	79
17	21	79
18	21	79
19	21	79
20	21	79
21	20	80
22	20	80
23	20	80
24	20	80
25	20	80
26	19	81
27	19	81
28	18	82
29	18	82
30	18	82

	Rain chance (%)
1	65
2	65
3	65
4	66
5	66
6	66
7	67
8	67
9	68
10	68
11	68
12	69
13	69
14	69
15	69
16	70
17	70
18	70
19	71
20	71
21	71
22	72
23	72
24	73
25	73
26	73
27	73
28	74
29	74
30	74

	Comfortable (%)	Humid (%)	Muggy (%)
1	34	66	0
2	34	66	0
3	34	66	0
4	33	67	0
5	33	67	0
6	32	68	0
7	32	68	0
8	31	69	0
9	30	70	0
10	29	71	0
11	28	72	0
12	27	73	0
13	26	74	0
14	25	75	0
15	24	76	0
16	24	76	0
17	23	77	0
18	22	78	0
19	21	79	0
20	21	79	0
21	20	80	0
22	20	80	0
23	20	80	0
24	20	80	0
25	19	80	1
26	19	80	1
27	19	80	1
28	20	79	1
29	20	79	1
30	20	79	1

	Avg high (°C)	Avg low (°C)
1	25	16
2	25	16
3	25	16
4	25	16
5	25	16
6	25	16
7	25	16
8	25	16
9	25	16
10	25	16
11	25	16
12	25	16
13	25	16
14	25	16
15	25	16
16	25	16
17	25	16
18	25	16
19	25	16
20	25	16
21	25	16
22	25	16
23	25	16
24	25	16
25	25	16
26	25	16
27	25	16
28	25	16
29	25	16
30	25	16

	Clearer (%)	Cloudier (%)
1	28	72
2	27	73
3	26	74
4	26	74
5	26	74
6	26	74
7	25	75
8	25	75
9	25	75
10	24	76
11	24	76
12	23	77
13	23	77
14	22	78
15	22	78
16	21	79
17	21	79
18	21	79
19	21	79
20	21	79
21	20	80
22	20	80
23	20	80
24	20	80
25	20	80
26	19	81
27	19	81
28	18	82
29	18	82
30	18	82

	Rain chance (%)
1	65
2	65
3	65
4	66
5	66
6	66
7	67
8	67
9	68
10	68
11	68
12	69
13	69
14	69
15	69
16	70
17	70
18	70
19	71
20	71
21	71
22	72
23	72
24	73
25	73
26	73
27	73
28	74
29	74
30	74

	Comfortable (%)	Humid (%)	Muggy (%)
1	34	66	0
2	34	66	0
3	34	66	0
4	33	67	0
5	33	67	0
6	32	68	0
7	32	68	0
8	31	69	0
9	30	70	0
10	29	71	0
11	28	72	0
12	27	73	0
13	26	74	0
14	25	75	0
15	24	76	0
16	24	76	0
17	23	77	0
18	22	78	0
19	21	79	0
20	21	79	0
21	20	80	0
22	20	80	0
23	20	80	0
24	20	80	0
25	19	80	1
26	19	80	1
27	19	80	1
28	20	79	1
29	20	79	1
30	20	79	1

	Avg high (°C)	Avg low (°C)
1	25	16
2	25	16
3	25	16
4	25	16
5	25	16
6	25	16
7	25	16
8	25	16
9	25	16
10	25	16
11	25	16
12	25	16
13	25	16
14	25	16
15	25	16
16	25	16
17	25	16
18	25	16
19	25	16
20	25	16
21	25	16
22	25	16
23	25	16
24	25	16
25	25	16
26	25	16
27	25	16
28	25	16
29	25	16
30	25	16

	Clearer (%)	Cloudier (%)
1	28	72
2	27	73
3	26	74
4	26	74
5	26	74
6	26	74
7	25	75
8	25	75
9	25	75
10	24	76
11	24	76
12	23	77
13	23	77
14	22	78
15	22	78
16	21	79
17	21	79
18	21	79
19	21	79
20	21	79
21	20	80
22	20	80
23	20	80
24	20	80
25	20	80
26	19	81
27	19	81
28	18	82
29	18	82
30	18	82

	Rain chance (%)
1	65
2	65
3	65
4	66
5	66
6	66
7	67
8	67
9	68
10	68
11	68
12	69
13	69
14	69
15	69
16	70
17	70
18	70
19	71
20	71
21	71
22	72
23	72
24	73
25	73
26	73
27	73
28	74
29	74
30	74

	Comfortable (%)	Humid (%)	Muggy (%)
1	34	66	0
2	34	66	0
3	34	66	0
4	33	67	0
5	33	67	0
6	32	68	0
7	32	68	0
8	31	69	0
9	30	70	0
10	29	71	0
11	28	72	0
12	27	73	0
13	26	74	0
14	25	75	0
15	24	76	0
16	24	76	0
17	23	77	0
18	22	78	0
19	21	79	0
20	21	79	0
21	20	80	0
22	20	80	0
23	20	80	0
24	20	80	0
25	19	80	1
26	19	80	1
27	19	80	1
28	20	79	1
29	20	79	1
30	20	79	1