San Lorenzo weather in September

In September, San Lorenzo sees average daytime highs of 24°C and overnight lows near 15°C, with 258 mm of rain across 24.5 wet days and about 12 hours of daylight. It is the 2nd-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels comfortable.

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 San Lorenzo's 4th-clearest and 3rd-windiest month. For the whole year in context, see San Lorenzo's year-round climate.

Daytime high
24°
2nd warmest
Overnight low
15°
1st coldest
Rainfall
258 mm
24.5 wet days
Daylight
12 hours
6:03 AM – 6:03 PM
Cloud cover
82%
4th clearest
Wind
3 km/h
3rd windiest
Solar energy
5.59 kWh/m²
Travel score
4.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical September day in San Lorenzo reaches about 24°C in the afternoon and slips back to 15°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 26°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

10°15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12415
22415
32415
42415
52415
62415
72415
82415
92415
102415
112415
122415
132415
142415
152415
162415
172415
182415
192415
202415
212415
222415
232415
242415
252415
262415
272415
282315
292315
302315

San Lorenzo weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan22° / 15°34229.211.93.7
Feb23° / 15°34326.3123.6
Mar23° / 15°40129.6123.6
Apr23° / 15°44129.3123.5
May23° / 15°39229.112.13.6
Jun23° / 15°27024.312.14.3
Jul24° / 15°18120.112.15.2
Aug24° / 15°14718.4125.4
Sep24° / 15°25824.5124.3
Oct23° / 15°38129.6123.6
Nov22° / 15°39328.911.93.4
Dec22° / 15°38829.611.93.6

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 10% of September, with mostly cloudy or overcast conditions the remaining 87%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11882
21882
31882
41882
51882
61783
71783
81684
91684
101585
111486
121486
131387
141288
151288
161090
171090
181090
191090
20991
21991
221090
23991
24991
25991
26991
27991
28991
29991
30991

Chance of precipitation in September

Any precipitation

San Lorenzo gets around 258 mm of rain over 24.5 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 82% and peaks near 91% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
170
270
370
471
572
672
773
874
975
1077
1178
1279
1380
1481
1583
1684
1785
1886
1987
2087
2188
2289
2389
2490
2590
2690
2791
2891
2991
3091

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the comfortable band about 79% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
132653
231663
330673
429683
528693
627703
726713
824733
923743
1022753
1120773
1219774
1317794
1416804
1514815
1613825
1712826
1811836
199856
208857
217867
227858
236868
245869
2558510
2648511
2748412
2848412
2938413
3038314

Wind in September

Winds average 3 km/h in September.

Across September, daily wind ranges from about 3 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
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm

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 6:08 AM to 5:59 AM, and sunset from 6:09 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.06:086:09
212.06:076:09
312.06:076:09
412.06:076:08
512.06:076:08
612.06:066:08
712.06:066:07
812.06:066:07
912.06:056:06
1012.06:056:06
1112.06:056:05
1212.06:046:05
1312.06:046:05
1412.06:046:04
1512.06:036:04
1612.06:036:03
1712.06:036:03
1812.06:026:03
1912.06:026:02
2012.06:026:02
2112.06:016:01
2212.06:016:01
2312.06:016:01
2412.06:006:00
2512.06:006:00
2612.06:005:59
2712.05:595:59
2812.05:595:59
2912.05:595:58
3012.05:595:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.59 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 4.51 kWh/m² to a high of 5.59 kWh/m² in September across the year — September's 5.59 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.6Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.5Bright
265.5Bright
275.5Bright
285.4Bright
295.4Bright
305.4Bright
Planning a trip in September

Is September a good time to visit San Lorenzo?

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

4.3
Sightseeing
3rd-best month of the year
3.7
Beach & pool
3rd-best month of the year

September is a reasonable time to visit San Lorenzo for sightseeing.

What to pack for San Lorenzo in September

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

In September, San Lorenzo sees daytime highs around 24°C and nights near 15°C. Pack rain gear. Worth having: light clothes and sun protection. About 25 days see rain.

rain gearlight clothessun protection

UV index in San Lorenzo 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 San Lorenzo peaks around February 19 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 at about 12 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 19UV 16Jul 24UV 12
UV index (midday)Level
Jan15Extreme
Feb16Extreme
Mar16Extreme
Apr14Extreme
May15Extreme
Jun13Extreme
Jul12Extreme
Aug12Extreme
Sep14Extreme
Oct14Extreme
Nov13Extreme
Dec13Extreme

Air quality in San Lorenzo 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 Lorenzo is worst in March — around 18 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (July, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateMar 1218 µg/m³Jul 1111 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb18Moderate
Mar18Moderate
Apr16Moderate
May13Moderate
Jun11Good
Jul11Good
Aug14Moderate
Sep17Moderate
Oct15Moderate
Nov14Moderate
Dec14Moderate
Location & terrain

Where is San Lorenzo?

San Lorenzo sits at 1.5°N, 77.2°W, 2,074 m above sea level, in Colombia. The nearest listed city is La Unión, 15 km away.

Topography around San Lorenzo

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

Within 3 km, the terrain around San Lorenzo has very significant variations in elevation — a maximum elevation change of 1,424 m around an average of 2,225 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,258 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,121 m.

The land around San Lorenzo is covered by trees (63%) and grassland (35%) within 3 km, trees (51%) and grassland (48%) within 16 km, and trees (76%) and grassland (23%) within 80 km.

3 km
1,424 m
16 km
2,258 m
80 km
4,121 m
treesshrubsgrasslandartificial surfaces
September weather nearby: La Unión 15 km · Buesaco 15 km · Providencia 29 km · Pasto 33 km · Samaniego 46 km · Balboa 60 km · Túquerres 64 km · Patía 65 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 Lorenzo (1.5029°, -77.2154°, elevation 2,074 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).