San Juan Nepomuceno weather in September

In September, San Juan Nepomuceno sees average daytime highs of 31°C and overnight lows near 24°C, with 218 mm of rain across 27.2 wet days and about 12.1 hours of daylight. It is the 10th-warmest and 3rd-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 1% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 12 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 Juan Nepomuceno's 10th-clearest and 7th-windiest month. For the whole year in context, see San Juan Nepomuceno's year-round climate.

Daytime high
31°
10th warmest
Overnight low
24°
6th coldest
Rainfall
218 mm
27.2 wet days
Daylight
12 h 06 min
5:53 AM – 5:56 PM
Cloud cover
90%
10th clearest
Wind
5 km/h
7th windiest
Solar energy
4.67 kWh/m²
Travel score
2.4
out of 10

San Juan Nepomuceno is Colombia.

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 Juan Nepomuceno reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°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)
13224
23224
33224
43124
53124
63124
73124
83124
93124
103124
113124
123124
133124
143124
153124
163124
173124
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293124
303124

How September really feels in San Juan Nepomuceno

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 Juan Nepomuceno weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan34° / 24°194.611.53.7
Feb35° / 24°235.511.72.8
Mar34° / 25°5812.211.92.6
Apr33° / 25°15023.512.22.3
May32° / 25°24328.112.42.3
Jun32° / 25°17324.112.62.6
Jul32° / 25°14123.612.52.5
Aug32° / 25°18526.712.32.3
Sep31° / 24°21827.212.12.4
Oct31° / 24°25228.411.82.6
Nov31° / 24°1742411.53.0
Dec32° / 24°7313.111.43.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 4% of September, with mostly cloudy or overcast conditions the remaining 95%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1595
2595
3595
4595
5595
6595
7595
8595
9694
10694
11694
12694
13694
14694
15694
16694
17694
18694
19595
20595
21595
22595
23595
24595
25595
26595
27595
28595
29595
30595

Chance of precipitation in September

Any precipitation

San Juan Nepomuceno gets around 218 mm of rain over 27.2 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 90% and peaks near 91% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
191
290
390
490
590
690
790
890
990
1090
1190
1290
1390
1490
1590
1690
1790
1891
1991
2091
2191
2291
2391
2491
2591
2691
2791
2891
2991
3091

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
12179
22179
32179
42278
52278
62278
72377
82377
92476
102476
112575
122575
132674
142674
152773
162773
172773
182872
192872
202872
212971
222971
232971
242971
252971
262971
272971
282971
292971
302971

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 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 18 minutes over September. Sunrise moves from 5:54 AM to 5:52 AM, and sunset from 6:06 PM to 5:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:546:06
212.25:546:05
312.25:546:05
412.25:546:04
512.25:546:03
612.15:546:03
712.15:546:02
812.15:546:01
912.15:546:01
1012.15:546:00
1112.15:536:00
1212.15:535:59
1312.15:535:58
1412.15:535:58
1512.15:535:57
1612.15:535:56
1712.05:535:56
1812.05:535:55
1912.05:535:54
2012.05:535:54
2112.05:535:53
2212.05:535:52
2312.05:525:52
2412.05:525:51
2512.05:525:50
2612.05:525:50
2712.05:525:49
2811.95:525:49
2911.95:525:48
3011.95:525:47

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.67 kWh/m².

For context, solar energy here swings from a low near 4.24 kWh/m² to a high of 5.67 kWh/m² in February across the year — September's 4.67 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.7Bright
174.6Bright
184.6Bright
194.6Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Is September a good time to visit San Juan Nepomuceno?

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

2.4
Sightseeing
9th-best month of the year
3.7
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in San Juan Nepomuceno.

What to pack for San Juan Nepomuceno in September

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

In September, San Juan Nepomuceno sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near San Juan Nepomuceno 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 60 km away) is warmest in July at about 30°C and coldest in March 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
Jan29Tropical
Feb28Tropical
Mar28Warm
Apr28Tropical
May29Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in San Juan Nepomuceno 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 Juan Nepomuceno peaks around June 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 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 highJun 11UV 13Dec 12UV 9
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar12Extreme
Apr12Extreme
May12Extreme
Jun13Extreme
Jul11Extreme
Aug12Extreme
Sep12Extreme
Oct11Extreme
Nov10Very high
Dec9Very high

Air quality in San Juan Nepomuceno 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 Juan Nepomuceno is worst in March — around 48 µg/m³ PM2.5 (poor), about 3.2× the cleanest month (November, 15 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateMar 1745 µg/m³Nov 1915 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb26Moderate
Mar48Poor
Apr30Moderate
May26Moderate
Jun24Moderate
Jul26Moderate
Aug21Moderate
Sep17Moderate
Oct16Moderate
Nov15Moderate
Dec15Moderate
Location & terrain

Where is San Juan Nepomuceno?

San Juan Nepomuceno sits at 10.0°N, 75.1°W, 172 m above sea level, in Colombia. The nearest listed city is San Jacinto, 14 km away.

Topography around San Juan Nepomuceno

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

Within 3 km, the terrain around San Juan Nepomuceno has significant variations in elevation — a maximum elevation change of 294 m around an average of 228 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 786 m; within 80 km, large variations in elevation — a maximum elevation change of 811 m.

The land around San Juan Nepomuceno is covered by trees (47%) and grassland (46%) within 3 km, trees (72%) and grassland (28%) within 16 km, and grassland (53%) and trees (28%) within 80 km.

3 km
294 m
16 km
786 m
80 km
811 m
treesgrasslandartificial surfaceswaterwetlandmangroves
September weather nearby: San Jacinto 14 km · San Pablo 23 km · María la Baja 24 km · El Carmen de Bolívar 26 km · Mahates 33 km · Plato 37 km · Santa Lucía 44 km · Arjona 44 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
Roman Catholic 64%Protestant 17%none 14%atheist 1%

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 Juan Nepomuceno (9.9516°, -75.082°, elevation 172 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).