San Jacinto weather in September

In September, San Jacinto sees average daytime highs of 31°C and overnight lows near 24°C, with 192 mm of rain across 26.4 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 Jacinto's 10th-clearest and 7th-windiest month. For the whole year in context, see San Jacinto's year-round climate.

Daytime high
31°
10th warmest
Overnight low
24°
5th coldest
Rainfall
192 mm
26.4 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
4.62 kWh/m²
Travel score
2.6
out of 10

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 Jacinto 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)
13124
23124
33124
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 Jacinto

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 Jacinto 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
Jan33° / 24°174.411.54.0
Feb35° / 24°215.611.73.0
Mar34° / 25°531211.92.7
Apr32° / 25°13822.412.22.5
May31° / 25°21327.712.42.4
Jun31° / 24°15323.112.62.7
Jul32° / 24°11720.812.52.8
Aug32° / 24°15524.712.32.6
Sep31° / 24°19226.412.12.6
Oct30° / 24°22428.311.82.6
Nov31° / 24°1532411.53.0
Dec32° / 24°5912.111.44.0

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 94%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1694
2694
3694
4694
5694
6595
7595
8595
9595
10595
11595
12595
13694
14694
15694
16694
17694
18694
19694
20694
21595
22595
23595
24595
25595
26595
27595
28595
29595
30595

Chance of precipitation in September

Any precipitation

San Jacinto gets around 192 mm of rain over 26.4 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 88% and peaks near 90% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
187
287
387
487
587
687
787
887
987
1087
1187
1287
1388
1488
1588
1688
1788
1888
1988
2089
2189
2289
2389
2489
2589
2689
2790
2890
2990
3090

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 67% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
13070
23070
33070
43070
53070
63070
73169
83169
93169
103169
113268
123268
133268
143268
153367
163367
173466
183466
193565
203565
213565
223664
233664
243664
253664
263763
273763
283763
293763
303763

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
45calm
55calm
65calm
75calm
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
812.15:546:02
912.15:546:01
1012.15:546:00
1112.15:546:00
1212.15:545:59
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
2212.05:535:53
2312.05:535:52
2412.05:525:51
2512.05:525:51
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 4.62 kWh/m².

For context, solar energy here swings from a low near 4.22 kWh/m² to a high of 5.66 kWh/m² in February across the year — September's 4.62 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.7Bright
114.7Bright
124.7Bright
134.7Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.6Bright
194.6Bright
204.6Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Is September a good time to visit San Jacinto?

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

2.6
Sightseeing
8th-best month of the year
3.8
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in San Jacinto.

What to pack for San Jacinto in September

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

In September, San Jacinto sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

Sea temperature near San Jacinto 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 55 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 Jacinto 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 Jacinto 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 Jacinto 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 Jacinto 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 Jacinto?

San Jacinto sits at 9.8°N, 75.1°W, 235 m above sea level, in Colombia. The nearest listed city is El Carmen de Bolívar, 12 km away.

Topography around San Jacinto

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

Within 3 km, the terrain around San Jacinto has significant variations in elevation — a maximum elevation change of 255 m around an average of 279 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 773 m; within 80 km, large variations in elevation — a maximum elevation change of 811 m.

The land around San Jacinto is covered by grassland (55%) and trees (39%) within 3 km, trees (69%) and grassland (30%) within 16 km, and grassland (53%) and trees (26%) within 80 km.

3 km
255 m
16 km
773 m
80 km
811 m
treesgrasslandartificial surfaceswaterwetlandmangroves
September weather nearby: El Carmen de Bolívar 12 km · San Juan Nepomuceno 14 km · María la Baja 26 km · San Pablo 30 km · Plato 37 km · San Onofre 45 km · Mahates 46 km · Arjona 53 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 Jacinto (9.8277°, -75.1217°, elevation 235 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).