San Agustin weather in September

In September, San Agustin sees average daytime highs of 18°C and overnight lows near 10°C, with 93 mm of rain across 23.3 wet days and about 12 hours of daylight. It is the 8th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 18°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels dry.

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 Agustin's 4th-clearest and 1st-windiest month. For the whole year in context, see San Agustin's year-round climate.

Daytime high: 18°; 8th warmest
Overnight low: 10°; 2nd coldest
Rainfall: 93 mm; 23.3 wet days
Daylight: 12 hours; 5:59 AM – 6:00 PM
Cloud cover: 82%; 4th clearest
Wind: 5 km/h; 1st windiest
Solar energy: 5.3 kWh/m²
Travel score: 3.9; out of 10

← August San Agustin 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 18°C through the month.

A typical September day in San Agustin reaches about 18°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 20°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler 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)	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	19	19	19	19	19	19	19	19	19	19	19	19	19
Avg low (°C)	9	9	9	9	9	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10

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

San Agustin weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 12th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	20° / 11°	152	22.3	11.9	4.3
Feb	20° / 11°	151	22.3	11.9	4.0
Mar	19° / 11°	198	28.6	12	3.4
Apr	19° / 11°	194	28.6	12	3.2
May	18° / 11°	163	28.9	12.1	3.2
Jun	17° / 10°	174	28.1	12.1	3.1
Jul	17° / 10°	180	28.2	12.1	3.1
Aug	17° / 9°	121	25.7	12.1	3.5
Sep	18° / 10°	93	23.3	12	3.9
Oct	20° / 11°	157	26.3	12	3.7
Nov	20° / 12°	191	27	11.9	3.6
Dec	20° / 11°	165	25.1	11.9	4.0

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 88%.

	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 (%)	13	12	12	12	13	13	14	14	14	14	14	14	13	13	13	12	12	12	12	12	12	11	10	10	10	10	9	9	9	9
Cloudier (%)	87	88	88	88	87	87	86	86	86	86	86	86	87	87	87	88	88	88	88	88	88	89	90	90	90	90	91	91	91	91

	Clearer (%)	Cloudier (%)
1	13	87
2	12	88
3	12	88
4	12	88
5	13	87
6	13	87
7	14	86
8	14	86
9	14	86
10	14	86
11	14	86
12	14	86
13	13	87
14	13	87
15	13	87
16	12	88
17	12	88
18	12	88
19	12	88
20	12	88
21	12	88
22	11	89
23	10	90
24	10	90
25	10	90
26	10	90
27	9	91
28	9	91
29	9	91
30	9	91

Chance of precipitation in September

Any precipitation

San Agustin gets around 93 mm of rain over 23.3 wet days in September, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 78% and peaks near 80% 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 (%)	78	78	78	78	77	77	77	77	77	77	77	77	77	78	78	78	78	78	78	78	78	78	78	78	79	79	79	80	80	80

	Rain chance (%)
1	78
2	78
3	78
4	78
5	77
6	77
7	77
8	77
9	77
10	77
11	77
12	77
13	77
14	78
15	78
16	78
17	78
18	78
19	78
20	78
21	78
22	78
23	78
24	78
25	79
26	79
27	79
28	80
29	80
30	80

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

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

	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
Dry (%)	100	100	100	99	99	99	99	99	99	99	99	99	98	98	98	98	98	98	98	98	98	98	98	97	97	96	96	95	94	93
Comfortable (%)	0	0	0	1	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	3	3	4	4	5	6	7

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	97	3
25	97	3
26	96	4
27	96	4
28	95	5
29	94	6
30	93	7

Wind in September

Winds average 5 km/h in September, the windiest month of the year.

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

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 6:04 AM to 5:55 AM, and sunset from 6:06 PM to 5:54 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)	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	6:04	6:03	6:03	6:03	6:03	6:02	6:02	6:02	6:01	6:01	6:01	6:00	6:00	6:00	5:59	5:59	5:59	5:58	5:58	5:58	5:57	5:57	5:57	5:57	5:56	5:56	5:56	5:55	5:55	5:55
Sunset (PM)	6:06	6:05	6:05	6:05	6:04	6:04	6:03	6:03	6:03	6:02	6:02	6:01	6:01	6:01	6:00	6:00	5:59	5:59	5:58	5:58	5:58	5:57	5:57	5:56	5:56	5:56	5:55	5:55	5:54	5:54

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.0	6:04	6:06
2	12.0	6:03	6:05
3	12.0	6:03	6:05
4	12.0	6:03	6:05
5	12.0	6:03	6:04
6	12.0	6:02	6:04
7	12.0	6:02	6:03
8	12.0	6:02	6:03
9	12.0	6:01	6:03
10	12.0	6:01	6:02
11	12.0	6:01	6:02
12	12.0	6:00	6:01
13	12.0	6:00	6:01
14	12.0	6:00	6:01
15	12.0	5:59	6:00
16	12.0	5:59	6:00
17	12.0	5:59	5:59
18	12.0	5:58	5:59
19	12.0	5:58	5:58
20	12.0	5:58	5:58
21	12.0	5:57	5:58
22	12.0	5:57	5:57
23	12.0	5:57	5:57
24	12.0	5:57	5:56
25	12.0	5:56	5:56
26	12.0	5:56	5:56
27	12.0	5:56	5:55
28	12.0	5:55	5:55
29	12.0	5:55	5:54
30	12.0	5:55	5:54

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.3 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.9 kWh/m² to a high of 5.3 kWh/m² in September across the year — September's 5.3 kWh/m² sits near the top of that range.

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

Planning a trip in September

Is September a good time to visit San Agustin?

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

3.9

Sightseeing

4th-best month of the year

1.4

Beach & pool

7th-best month of the year

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

What to pack for San Agustin in September

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

In September, San Agustin sees daytime highs around 18°C and nights near 10°C. Pack rain gear. Worth having: sun protection. About 23 days see rain.

rain gearsun protection

UV index in San Agustin in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 15 (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 Agustin peaks around February 19 at about 17 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 10 at about 13 (extreme).

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)	16	17	17	14	15	14	13	13	15	15	13	13
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	16	Extreme
Feb	17	Extreme
Mar	17	Extreme
Apr	14	Extreme
May	15	Extreme
Jun	14	Extreme
Jul	13	Extreme
Aug	13	Extreme
Sep	15	Extreme
Oct	15	Extreme
Nov	13	Extreme
Dec	13	Extreme

Air quality in San Agustin 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 Agustin is worst in March — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (July, 9 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)	15	18	19	16	12	10	9	12	16	13	13	14
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	15	Moderate
Feb	18	Moderate
Mar	19	Moderate
Apr	16	Moderate
May	12	Moderate
Jun	10	Good
Jul	9	Good
Aug	12	Good
Sep	16	Moderate
Oct	13	Moderate
Nov	13	Moderate
Dec	14	Moderate

Location & terrain

Where is San Agustin?

San Agustin sits at 1.9°N, 76.3°W, 0 m above sea level, in Colombia. The nearest listed city is Isnos, 7.0 km away.

Topography around San Agustin

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

Within 3 km, the terrain around San Agustin has significant variations in elevation — a maximum elevation change of 559 m around an average of 1,619 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,905 m; within 80 km, extreme variations in elevation — a maximum elevation change of 4,369 m.

The land around San Agustin is covered by trees (67%) and grassland (29%) within 3 km, trees (70%) and grassland (30%) within 16 km, and trees (78%) and grassland (22%) within 80 km.

3 km

559 m

trees 67%

16 km

1,905 m

trees 70%

80 km

4,369 m

trees 78%

treesgrasslandartificial surfaces

← August San Agustin year-round climate October →Best places to visit in September

September weather nearby: Isnos 7.0 km · Pitalito 24 km · Tarqui 56 km · Guadalupe 59 km · La Plata 71 km · Popayán 73 km · Florencia 79 km · Garzón 79 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 Agustin (1.8788°, -76.2672°, elevation 0 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).

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

	Clearer (%)	Cloudier (%)
1	13	87
2	12	88
3	12	88
4	12	88
5	13	87
6	13	87
7	14	86
8	14	86
9	14	86
10	14	86
11	14	86
12	14	86
13	13	87
14	13	87
15	13	87
16	12	88
17	12	88
18	12	88
19	12	88
20	12	88
21	12	88
22	11	89
23	10	90
24	10	90
25	10	90
26	10	90
27	9	91
28	9	91
29	9	91
30	9	91

	Rain chance (%)
1	78
2	78
3	78
4	78
5	77
6	77
7	77
8	77
9	77
10	77
11	77
12	77
13	77
14	78
15	78
16	78
17	78
18	78
19	78
20	78
21	78
22	78
23	78
24	78
25	79
26	79
27	79
28	80
29	80
30	80

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	97	3
25	97	3
26	96	4
27	96	4
28	95	5
29	94	6
30	93	7

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

	Clearer (%)	Cloudier (%)
1	13	87
2	12	88
3	12	88
4	12	88
5	13	87
6	13	87
7	14	86
8	14	86
9	14	86
10	14	86
11	14	86
12	14	86
13	13	87
14	13	87
15	13	87
16	12	88
17	12	88
18	12	88
19	12	88
20	12	88
21	12	88
22	11	89
23	10	90
24	10	90
25	10	90
26	10	90
27	9	91
28	9	91
29	9	91
30	9	91

	Rain chance (%)
1	78
2	78
3	78
4	78
5	77
6	77
7	77
8	77
9	77
10	77
11	77
12	77
13	77
14	78
15	78
16	78
17	78
18	78
19	78
20	78
21	78
22	78
23	78
24	78
25	79
26	79
27	79
28	80
29	80
30	80

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	97	3
25	97	3
26	96	4
27	96	4
28	95	5
29	94	6
30	93	7

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

	Clearer (%)	Cloudier (%)
1	13	87
2	12	88
3	12	88
4	12	88
5	13	87
6	13	87
7	14	86
8	14	86
9	14	86
10	14	86
11	14	86
12	14	86
13	13	87
14	13	87
15	13	87
16	12	88
17	12	88
18	12	88
19	12	88
20	12	88
21	12	88
22	11	89
23	10	90
24	10	90
25	10	90
26	10	90
27	9	91
28	9	91
29	9	91
30	9	91

	Rain chance (%)
1	78
2	78
3	78
4	78
5	77
6	77
7	77
8	77
9	77
10	77
11	77
12	77
13	77
14	78
15	78
16	78
17	78
18	78
19	78
20	78
21	78
22	78
23	78
24	78
25	79
26	79
27	79
28	80
29	80
30	80

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	97	3
25	97	3
26	96	4
27	96	4
28	95	5
29	94	6
30	93	7