Andes weather in September

In September, Andes sees average daytime highs of 25°C and overnight lows near 16°C, with 340 mm of rain across 29.9 wet days and about 12 hours of daylight. It is the 3rd-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 0% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Andes's 8th-clearest and 2nd-windiest month. For the whole year in context, see Andes's year-round climate.

Daytime high
25°
3rd warmest
Overnight low
16°
7th coldest
Rainfall
340 mm
29.9 wet days
Daylight
12 hours
5:57 AM – 5:59 PM
Cloud cover
91%
8th clearest
Wind
3 km/h
2nd windiest
Solar energy
4.82 kWh/m²
Travel score
3.4
out of 10

Andes is Colombia settlement.

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 25°C through the month.

A typical September day in Andes reaches about 25°C in the afternoon and slips back to 16°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12516
22516
32516
42516
52516
62516
72516
82516
92516
102516
112516
122516
132516
142516
152516
162516
172516
182516
192516
202516
212516
222516
232516
242516
252516
262516
272516
282516
292516
302516

Andes weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan25° / 16°20029.411.73.8
Feb25° / 16°21126.811.83.7
Mar25° / 17°29130.5123.5
Apr25° / 17°36229.912.13.4
May24° / 17°40330.812.33.4
Jun25° / 16°28229.912.33.4
Jul25° / 16°26030.912.33.4
Aug26° / 16°3023112.23.4
Sep25° / 16°34029.9123.4
Oct24° / 16°40930.711.93.5
Nov24° / 16°37529.311.73.6
Dec24° / 16°25929.911.73.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 2% of September, with mostly cloudy or overcast conditions the remaining 97%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1397
2397
3397
4397
5397
6397
7397
8397
9397
10397
11298
12298
13298
14298
15298
16298
17298
18298
19298
20298
21298
22298
23298
24298
25298
26298
27298
28298
29199
30199

Chance of precipitation in September

Any precipitation

Andes gets around 340 mm of rain over 29.9 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 100% and peaks near 100% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)
13970
23970
33970
42980
52980
62980
72980
82980
92980
102971
112971
122971
131981
141981
151981
161981
171981
181981
191981
201981
210991
220991
230991
240991
250991
260982
270982
280982
290982
300982

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 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
13calm
23calm
33calm
43calm
53calm
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 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over September. Sunrise moves from 6:00 AM to 5:54 AM, and sunset from 6:06 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.16:006:06
212.16:006:06
312.16:006:06
412.15:596:05
512.15:596:05
612.15:596:04
712.15:596:03
812.15:596:03
912.15:586:02
1012.15:586:02
1112.15:586:01
1212.15:586:01
1312.05:586:00
1412.05:576:00
1512.05:575:59
1612.05:575:59
1712.05:575:58
1812.05:565:58
1912.05:565:57
2012.05:565:57
2112.05:565:56
2212.05:565:56
2312.05:555:55
2412.05:555:55
2512.05:555:54
2612.05:555:54
2712.05:555:53
2812.05:545:52
2912.05:545:52
3012.05:545:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.82 kWh/m².

For context, solar energy here swings from a low near 3.82 kWh/m² to a high of 5.11 kWh/m² in August across the year — September's 4.82 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
104.9Bright
114.9Bright
124.9Bright
134.9Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.6Bright
294.5Bright
304.5Bright
Planning a trip in September

Is September a good time to visit Andes?

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

3.4
Sightseeing
7th-best month of the year
3.1
Beach & pool
7th-best month of the year

September is a weaker month for outdoor sightseeing in Andes.

What to pack for Andes in September

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

In September, Andes sees daytime highs around 25°C and nights near 16°C. Pack rain gear. Worth having: light clothes and sun protection. About 30 days see rain.

rain gearlight clothessun protection

UV index in Andes 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 Andes peaks around February 22 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 12 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 22UV 15Dec 14UV 12
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr12Extreme
May14Extreme
Jun13Extreme
Jul13Extreme
Aug12Extreme
Sep13Extreme
Oct13Extreme
Nov12Extreme
Dec11Extreme

Air quality in Andes 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 Andes is worst in March — around 30 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (October, 18 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1530 µg/m³Oct 2118 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb27Moderate
Mar30Moderate
Apr24Moderate
May21Moderate
Jun20Moderate
Jul20Moderate
Aug21Moderate
Sep20Moderate
Oct18Moderate
Nov19Moderate
Dec22Moderate
Location & terrain

Where is Andes?

Andes sits at 5.7°N, 75.9°W, 1,282 m above sea level, in Colombia. The nearest listed city is Ciudad Bolívar, 27 km away.

Topography around Andes

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

Within 3 km, the terrain around Andes has large variations in elevation — a maximum elevation change of 774 m around an average of 1,470 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,814 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,018 m.

The land around Andes is covered by trees (84%) within 3 km, trees (82%) within 16 km, and trees (79%) and grassland (20%) within 80 km.

3 km
774 m
16 km
2,814 m
80 km
4,018 m
treesgrasslandartificial surfaces
September weather nearby: Ciudad Bolívar 27 km · Riosucio 33 km · Supía 34 km · Salgar 36 km · Anserma 37 km · Fredonia 38 km · Quinchía 39 km · Concordia 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 Andes (5.6561°, -75.8788°, elevation 1,282 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).