Fonseca weather in September

In September, Fonseca sees average daytime highs of 31°C and overnight lows near 22°C, with 171 mm of rain across 26 wet days and about 12.1 hours of daylight. It is the 4th-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 4% of the time in September, and the air most often feels oppressive.

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 Fonseca's 10th-clearest and 11th-windiest month. For the whole year in context, see Fonseca's year-round climate.

Daytime high
31°
4th warmest
Overnight low
22°
7th coldest
Rainfall
171 mm
26 wet days
Daylight
12 h 06 min
5:44 AM – 5:48 PM
Cloud cover
86%
10th clearest
Wind
4 km/h
11th windiest
Solar energy
5.42 kWh/m²
Travel score
2.6
out of 10

Fonseca is place in Columbia.

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 Fonseca reaches about 31°C in the afternoon and slips back to 22°C overnight — a 9°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 about 1°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13222
23222
33222
43222
53222
63222
73222
83222
93222
103122
113122
123122
133122
143122
153122
163122
173122
183122
193122
203122
213122
223122
233122
243122
253122
263122
273122
283122
293122
303122

How September really feels in Fonseca

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.

Fonseca weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 20°27811.45.4
Feb30° / 21°287.811.65.0
Mar31° / 21°6513.111.94.1
Apr31° / 22°12220.712.23.1
May31° / 23°19025.812.52.7
Jun31° / 22°11920.612.63.0
Jul32° / 22°10419.512.63.0
Aug32° / 22°14823.912.42.6
Sep31° / 22°1712612.12.6
Oct30° / 21°17527.111.82.8
Nov30° / 21°12022.211.53.5
Dec30° / 21°6015.211.44.5

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 7% of September, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11288
21288
31486
41486
51486
61486
71387
81387
91387
101387
111387
121387
131288
141288
151288
161090
171090
181090
19991
20892
21892
22793
23793
24793
25793
26892
27892
28892
29892
30892

Chance of precipitation in September

Any precipitation

Fonseca gets around 171 mm of rain over 26 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 87% and peaks near 89% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
181
282
382
482
583
683
784
885
985
1086
1187
1287
1387
1488
1588
1688
1789
1889
1989
2089
2189
2289
2389
2489
2588
2688
2788
2888
2988
3088

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 (%)
13952
23952
33952
43952
53952
63952
72962
82953
92953
102953
112953
122944
132944
142944
152944
162935
171945
181945
191945
201945
211945
221945
231945
241945
251945
261954
271954
281954
291954
301954

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.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 5:45 AM to 5:43 AM, and sunset from 5:57 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:455:57
212.25:455:57
312.25:455:56
412.25:455:56
512.25:455:55
612.25:455:54
712.25:445:54
812.15:445:53
912.15:445:52
1012.15:445:52
1112.15:445:51
1212.15:445:50
1312.15:445:50
1412.15:445:49
1512.15:445:48
1612.15:445:48
1712.05:445:47
1812.05:445:46
1912.05:445:45
2012.05:445:45
2112.05:445:44
2212.05:445:43
2312.05:445:43
2412.05:435:42
2512.05:435:41
2612.05:435:41
2711.95:435:40
2811.95:435:39
2911.95:435:39
3011.95:435:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.42 kWh/m².

For context, solar energy here swings from a low near 4.49 kWh/m² to a high of 5.8 kWh/m² in August across the year — September's 5.42 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.6Bright
65.6Bright
75.6Bright
85.6Bright
95.6Bright
105.5Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.4Bright
165.4Bright
175.4Bright
185.4Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.1Bright
Planning a trip in September

Is September a good time to visit Fonseca?

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

2.6
Sightseeing
11th-best month of the year
3.9
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Fonseca.

What to pack for Fonseca in September

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

In September, Fonseca sees daytime highs around 31°C and nights near 22°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

Sea temperature near Fonseca 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 62 km away) is warmest in October at about 29°C and coldest in February near 25°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar25Warm
Apr26Warm
May27Warm
Jun28Warm
Jul27Warm
Aug28Warm
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Fonseca in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fonseca peaks around March 24 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 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 highMar 24UV 14Dec 12UV 10
UV index (midday)Level
Jan11Extreme
Feb13Extreme
Mar14Extreme
Apr14Extreme
May13Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep13Extreme
Oct12Extreme
Nov10Very high
Dec10Very high

Air quality in Fonseca 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 Fonseca is worst in June — around 30 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (January, 11 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 1530 µg/m³Jan 1011 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb15Moderate
Mar22Moderate
Apr25Moderate
May28Moderate
Jun30Moderate
Jul27Moderate
Aug28Moderate
Sep19Moderate
Oct16Moderate
Nov13Moderate
Dec11Good
Location & terrain

Where is Fonseca?

Fonseca sits at 10.9°N, 72.8°W, 182 m above sea level, in Colombia. The nearest listed city is Barrancas, 10 km away.

Topography around Fonseca

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

Within 3 km, the terrain around Fonseca has only modest variations in elevation — a maximum elevation change of 41 m around an average of 181 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,192 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,193 m.

The land around Fonseca is covered by grassland (37%), trees (28%) and cropland (20%) within 3 km, trees (51%) and grassland (27%) within 16 km, and trees (62%) and grassland (21%) within 80 km.

3 km
41 m
16 km
1,192 m
80 km
5,193 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Barrancas 10 km · San Juan del Cesar 21 km · Hatonuevo 22 km · Villanueva 34 km · Albania 41 km · Valledupar 64 km · San Diego 71 km · Riohacha 73 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 Fonseca (10.8861°, -72.8487°, elevation 182 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).