San Juan del Cesar weather in September

In September, San Juan del Cesar sees average daytime highs of 29°C and overnight lows near 21°C, with 248 mm of rain across 29.3 wet days and about 12.1 hours of daylight. It is the 3rd-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels muggy.

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 del Cesar's 11th-clearest and 12th-windiest month. For the whole year in context, see San Juan del Cesar's year-round climate.

Daytime high: 29°; 3rd warmest
Overnight low: 21°; 9th coldest
Rainfall: 248 mm; 29.3 wet days
Daylight: 12 h 06 min; 5:45 AM – 5:48 PM
Cloud cover: 88%; 11th clearest
Wind: 3 km/h; 12th windiest
Solar energy: 5.27 kWh/m²
Travel score: 2.8; out of 10

← August San Juan del Cesar 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 29°C through the month.

A typical September day in San Juan del Cesar reaches about 29°C in the afternoon and slips back to 21°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, September runs on par with August and about 1°C warmer than 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)	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29
Avg low (°C)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21

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

San Juan del Cesar weather by month

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

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 19°	63	13.2	11.4	6.1
Feb	28° / 19°	63	11.6	11.6	5.7
Mar	28° / 20°	143	17.3	11.9	4.8
Apr	28° / 21°	274	24.6	12.2	3.6
May	29° / 21°	327	28.6	12.5	3.1
Jun	29° / 21°	179	25	12.6	3.3
Jul	29° / 21°	185	26.9	12.6	3.2
Aug	30° / 21°	229	29.4	12.4	2.8
Sep	29° / 21°	248	29.3	12.1	2.8
Oct	28° / 20°	269	29.4	11.8	3.2
Nov	28° / 20°	222	25.2	11.5	3.9
Dec	28° / 20°	121	18.7	11.4	5.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 92%.

	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 (%)	9	10	10	10	9	9	9	10	10	10	10	10	9	8	8	7	7	7	6	6	6	6	6	6	6	6	6	6	6	6
Cloudier (%)	91	90	90	90	91	91	91	90	90	90	90	90	91	92	92	93	93	93	94	94	94	94	94	94	94	94	94	94	94	94

	Clearer (%)	Cloudier (%)
1	9	91
2	10	90
3	10	90
4	10	90
5	9	91
6	9	91
7	9	91
8	10	90
9	10	90
10	10	90
11	10	90
12	10	90
13	9	91
14	8	92
15	8	92
16	7	93
17	7	93
18	7	93
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	6	94
30	6	94

Chance of precipitation in September

Any precipitation

San Juan del Cesar gets around 248 mm of rain over 29.3 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 98% and peaks near 99% on the wettest days.

	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 (%)	96	96	97	97	97	97	97	98	98	98	98	98	99	99	99	99	99	99	98	98	98	98	98	97	97	97	97	97	97	97

	Rain chance (%)
1	96
2	96
3	97
4	97
5	97
6	97
7	97
8	98
9	98
10	98
11	98
12	98
13	99
14	99
15	99
16	99
17	99
18	99
19	98
20	98
21	98
22	98
23	98
24	97
25	97
26	97
27	97
28	97
29	97
30	97

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 70% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	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
Muggy (%)	76	75	75	74	74	73	73	72	72	71	71	70	69	69	68	68	67	67	67	67	67	67	67	67	67	68	68	68	68	68
Oppressive (%)	24	25	25	26	26	27	27	28	28	29	29	30	31	31	32	32	33	33	33	33	33	33	33	33	33	32	32	32	32	32

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

Wind in September

Winds average 3 km/h in September, the calmest month.

Across September, daily wind ranges from about 3 km/h on the calmest days to 3 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)	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3
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	3	calm
2	3	calm
3	3	calm
4	3	calm
5	3	calm
6	3	calm
7	3	calm
8	3	calm
9	3	calm
10	3	calm
11	3	calm
12	3	calm
13	3	calm
14	3	calm
15	3	calm
16	3	calm
17	3	calm
18	3	calm
19	3	calm
20	3	calm
21	3	calm
22	3	calm
23	3	calm
24	3	calm
25	3	calm
26	3	calm
27	3	calm
28	3	calm
29	3	calm
30	3	calm

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 5:44 AM, and sunset from 5:58 PM to 5:39 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)	12.2	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9
Sunrise (AM)	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:45	5:44	5:44	5:44	5:44	5:44	5:44	5:44	5:44	5:44	5:44	5:44	5:44	5:44
Sunset (PM)	5:58	5:57	5:57	5:56	5:55	5:55	5:54	5:53	5:53	5:52	5:51	5:51	5:50	5:49	5:49	5:48	5:47	5:47	5:46	5:45	5:45	5:44	5:43	5:43	5:42	5:41	5:41	5:40	5:39	5:39

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	5:45	5:58
2	12.2	5:45	5:57
3	12.2	5:45	5:57
4	12.2	5:45	5:56
5	12.2	5:45	5:55
6	12.2	5:45	5:55
7	12.1	5:45	5:54
8	12.1	5:45	5:53
9	12.1	5:45	5:53
10	12.1	5:45	5:52
11	12.1	5:45	5:51
12	12.1	5:45	5:51
13	12.1	5:45	5:50
14	12.1	5:45	5:49
15	12.1	5:45	5:49
16	12.1	5:45	5:48
17	12.0	5:45	5:47
18	12.0	5:44	5:47
19	12.0	5:44	5:46
20	12.0	5:44	5:45
21	12.0	5:44	5:45
22	12.0	5:44	5:44
23	12.0	5:44	5:43
24	12.0	5:44	5:43
25	12.0	5:44	5:42
26	12.0	5:44	5:41
27	11.9	5:44	5:41
28	11.9	5:44	5:40
29	11.9	5:44	5:39
30	11.9	5:44	5:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.27 kWh/m².

For context, solar energy here swings from a low near 4.41 kWh/m² to a high of 5.61 kWh/m² in August across the year — September's 5.27 kWh/m² falls in the middle.

	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)	5.5	5.5	5.5	5.5	5.5	5.5	5.4	5.4	5.4	5.4	5.4	5.3	5.3	5.3	5.3	5.3	5.2	5.2	5.2	5.2	5.2	5.1	5.1	5.1	5.1	5.1	5.1	5.0	5.0	5.0
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	5.5	Bright
2	5.5	Bright
3	5.5	Bright
4	5.5	Bright
5	5.5	Bright
6	5.5	Bright
7	5.4	Bright
8	5.4	Bright
9	5.4	Bright
10	5.4	Bright
11	5.4	Bright
12	5.3	Bright
13	5.3	Bright
14	5.3	Bright
15	5.3	Bright
16	5.3	Bright
17	5.2	Bright
18	5.2	Bright
19	5.2	Bright
20	5.2	Bright
21	5.2	Bright
22	5.1	Bright
23	5.1	Bright
24	5.1	Bright
25	5.1	Bright
26	5.1	Bright
27	5.1	Bright
28	5.0	Bright
29	5.0	Bright
30	5.0	Bright

Planning a trip in September

Is September a good time to visit San Juan del Cesar?

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

2.8

Sightseeing

11th-best month of the year

3.6

Beach & pool

12th-best month of the year

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

What to pack for San Juan del Cesar in September

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

In September, San Juan del Cesar sees daytime highs around 29°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 29 days see rain.

light clothesrain gearsun protection

Sea temperature near San Juan del Cesar 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 68 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	25	25	25	26	27	28	27	28	29	29	28	27
Comfort	Warm	Warm	Warm	Warm	Warm	Warm	Warm	Warm	Tropical	Tropical	Tropical	Warm

	Sea temperature (°C)	Comfort
Jan	25	Warm
Feb	25	Warm
Mar	25	Warm
Apr	26	Warm
May	27	Warm
Jun	28	Warm
Jul	27	Warm
Aug	28	Warm
Sep	29	Tropical
Oct	29	Tropical
Nov	28	Tropical
Dec	27	Warm

UV index in San Juan del Cesar 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 San Juan del Cesar peaks around April 11 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	11	13	14	14	13	13	12	13	13	12	10	10
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high

	UV index (midday)	Level
Jan	11	Extreme
Feb	13	Extreme
Mar	14	Extreme
Apr	14	Extreme
May	13	Extreme
Jun	13	Extreme
Jul	12	Extreme
Aug	13	Extreme
Sep	13	Extreme
Oct	12	Extreme
Nov	10	Extreme
Dec	10	Very high

Air quality in San Juan del Cesar 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 del Cesar is worst in March — around 34 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (December, 12 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)	13	20	34	27	26	27	25	27	18	16	13	12
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Good

	PM2.5 (µg/m³)	Level
Jan	13	Moderate
Feb	20	Moderate
Mar	34	Moderate
Apr	27	Moderate
May	26	Moderate
Jun	27	Moderate
Jul	25	Moderate
Aug	27	Moderate
Sep	18	Moderate
Oct	16	Moderate
Nov	13	Moderate
Dec	12	Good

Location & terrain

Where is San Juan del Cesar?

San Juan del Cesar sits at 10.8°N, 73.0°W, 214 m above sea level, in Colombia. The nearest listed city is Villanueva, 18 km away.

Topography around San Juan del Cesar

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

Within 3 km, the terrain around San Juan del Cesar has only modest variations in elevation — a maximum elevation change of 105 m around an average of 214 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,124 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,722 m.

The land around San Juan del Cesar is covered by grassland (64%) within 3 km, grassland (49%) and trees (38%) within 16 km, and trees (65%) and grassland (22%) within 80 km.

3 km

105 m

grassland 64%

16 km

1,124 m

grassland 49%

80 km

5,722 m

trees 65%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← August San Juan del Cesar year-round climate October →Best places to visit in September

September weather nearby: Villanueva 18 km · Fonseca 21 km · Barrancas 31 km · Hatonuevo 42 km · Valledupar 44 km · San Diego 52 km · Albania 62 km · Agustín Codazzi 86 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 San Juan del Cesar (10.7711°, -73.0031°, elevation 214 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).

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

	Clearer (%)	Cloudier (%)
1	9	91
2	10	90
3	10	90
4	10	90
5	9	91
6	9	91
7	9	91
8	10	90
9	10	90
10	10	90
11	10	90
12	10	90
13	9	91
14	8	92
15	8	92
16	7	93
17	7	93
18	7	93
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	96
2	96
3	97
4	97
5	97
6	97
7	97
8	98
9	98
10	98
11	98
12	98
13	99
14	99
15	99
16	99
17	99
18	99
19	98
20	98
21	98
22	98
23	98
24	97
25	97
26	97
27	97
28	97
29	97
30	97

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

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

	Clearer (%)	Cloudier (%)
1	9	91
2	10	90
3	10	90
4	10	90
5	9	91
6	9	91
7	9	91
8	10	90
9	10	90
10	10	90
11	10	90
12	10	90
13	9	91
14	8	92
15	8	92
16	7	93
17	7	93
18	7	93
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	96
2	96
3	97
4	97
5	97
6	97
7	97
8	98
9	98
10	98
11	98
12	98
13	99
14	99
15	99
16	99
17	99
18	99
19	98
20	98
21	98
22	98
23	98
24	97
25	97
26	97
27	97
28	97
29	97
30	97

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

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

	Clearer (%)	Cloudier (%)
1	9	91
2	10	90
3	10	90
4	10	90
5	9	91
6	9	91
7	9	91
8	10	90
9	10	90
10	10	90
11	10	90
12	10	90
13	9	91
14	8	92
15	8	92
16	7	93
17	7	93
18	7	93
19	6	94
20	6	94
21	6	94
22	6	94
23	6	94
24	6	94
25	6	94
26	6	94
27	6	94
28	6	94
29	6	94
30	6	94

	Rain chance (%)
1	96
2	96
3	97
4	97
5	97
6	97
7	97
8	98
9	98
10	98
11	98
12	98
13	99
14	99
15	99
16	99
17	99
18	99
19	98
20	98
21	98
22	98
23	98
24	97
25	97
26	97
27	97
28	97
29	97
30	97

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