Santiago weather in September

In September, Santiago sees average daytime highs of 22°C and overnight lows near 12°C, with 160 mm of rain across 10.5 wet days and about 11.8 hours of daylight. It is the 8th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 22°C through the month. The sky is clear or mostly clear about 39% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Santiago's 9th-clearest and 1st-windiest month. For the whole year in context, see Santiago's year-round climate.

Daytime high: 22°; 8th warmest
Overnight low: 12°; 5th coldest
Rainfall: 160 mm; 10.5 wet days
Daylight: 11 h 48 min; 7:39 AM – 7:29 PM
Cloud cover: 55%; 9th clearest
Wind: 13 km/h; 1st windiest
Solar energy: 4.45 kWh/m²
Travel score: 6.6; out of 10

Santiago is human settlement in Brazil.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Santiago 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 22°C through the month.

A typical September day in Santiago reaches about 22°C in the afternoon and slips back to 12°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 29°C. Set against its neighbours, September runs about 1°C warmer than August and about 3°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)	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	22	23	23	23	23	23	23	23
Avg low (°C)	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	13	13	13	13	13	13	13	13	13

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

Santiago weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 5th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 20°	174	14.2	13.7	4.6
Feb	29° / 19°	154	13.4	13	4.9
Mar	28° / 18°	144	11.7	12.2	5.9
Apr	25° / 15°	161	10.5	11.3	6.8
May	21° / 12°	125	9.4	10.6	6.6
Jun	19° / 10°	136	9.9	10.2	6.1
Jul	19° / 9°	150	9.9	10.3	6.2
Aug	21° / 11°	130	9.2	11	6.8
Sep	22° / 12°	160	10.5	11.8	6.6
Oct	25° / 15°	236	12.6	12.7	6.5
Nov	27° / 16°	155	10.4	13.5	6.4
Dec	29° / 18°	169	12.2	13.8	5.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% 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 51%.

	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 (%)	52	52	51	50	49	49	47	47	47	47	47	47	47	48	48	48	49	49	49	51	51	51	51	51	50	50	50	48	48	47
Cloudier (%)	48	48	49	50	51	51	53	53	53	53	53	53	53	52	52	52	51	51	51	49	49	49	49	49	50	50	50	52	52	53

	Clearer (%)	Cloudier (%)
1	52	48
2	52	48
3	51	49
4	50	50
5	49	51
6	49	51
7	47	53
8	47	53
9	47	53
10	47	53
11	47	53
12	47	53
13	47	53
14	48	52
15	48	52
16	48	52
17	49	51
18	49	51
19	49	51
20	51	49
21	51	49
22	51	49
23	51	49
24	51	49
25	50	50
26	50	50
27	50	50
28	48	52
29	48	52
30	47	53

Chance of precipitation in September

Any precipitation

Santiago gets around 160 mm of rain over 10.5 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 36% and peaks near 37% 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 (%)	33	34	34	35	35	36	36	36	36	36	36	36	37	37	36	36	36	36	35	35	35	35	35	35	35	36	36	37	37	37

	Rain chance (%)
1	33
2	34
3	34
4	35
5	35
6	36
7	36
8	36
9	36
10	36
11	36
12	36
13	37
14	37
15	36
16	36
17	36
18	36
19	35
20	35
21	35
22	35
23	35
24	35
25	35
26	36
27	36
28	37
29	37
30	37

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 51% 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 (%)	53	54	53	53	53	53	54	52	53	53	53	53	52	53	52	51	52	52	52	50	50	50	49	48	47	46	45	44	43	42
Comfortable (%)	24	23	23	23	23	23	22	23	23	23	23	23	24	24	24	25	25	25	25	26	26	27	27	27	28	28	28	28	28	28
Humid (%)	21	21	22	22	22	22	22	22	21	21	21	21	21	20	20	20	19	19	19	19	19	19	19	19	19	20	20	20	20	20
Muggy (%)	2	2	2	2	2	2	2	3	3	3	3	3	3	3	4	4	4	4	4	5	5	5	5	6	6	7	7	8	8	9

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	53	24	21	2
2	54	23	21	2
3	53	23	22	2
4	53	23	22	2
5	53	23	22	2
6	53	23	22	2
7	54	22	22	2
8	52	23	22	3
9	53	23	21	3
10	53	23	21	3
11	53	23	21	3
12	53	23	21	3
13	52	24	21	3
14	53	24	20	3
15	52	24	20	4
16	51	25	20	4
17	52	25	19	4
18	52	25	19	4
19	52	25	19	4
20	50	26	19	5
21	50	26	19	5
22	50	27	19	5
23	49	27	19	5
24	48	27	19	6
25	47	28	19	6
26	46	28	20	7
27	45	28	20	7
28	44	28	20	8
29	43	28	20	8
30	42	28	20	9

Wind in September

Winds average 13 km/h in September, the windiest month of the year.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 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)	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	12	12	12	12	13	13	13	13	13
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	13	light breeze
2	13	light breeze
3	13	light breeze
4	13	light breeze
5	13	light breeze
6	13	light breeze
7	13	light breeze
8	13	light breeze
9	13	light breeze
10	13	light breeze
11	13	light breeze
12	13	light breeze
13	13	light breeze
14	13	light breeze
15	13	light breeze
16	13	light breeze
17	13	light breeze
18	13	light breeze
19	13	light breeze
20	13	light breeze
21	13	light breeze
22	12	light breeze
23	12	light breeze
24	12	light breeze
25	12	light breeze
26	13	light breeze
27	13	light breeze
28	13	light breeze
29	13	light breeze
30	13	light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 24 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over September. Sunrise moves from 7:58 AM to 7:21 AM, and sunset from 7:21 PM to 7:36 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)	11.4	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.8	11.9	11.9	11.9	11.9	12.0	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.2	12.2
Sunrise (AM)	7:58	7:56	7:55	7:54	7:53	7:52	7:50	7:49	7:48	7:47	7:45	7:44	7:43	7:42	7:40	7:39	7:38	7:36	7:35	7:34	7:33	7:31	7:30	7:29	7:28	7:26	7:25	7:24	7:23	7:21
Sunset (PM)	7:21	7:21	7:22	7:22	7:23	7:23	7:24	7:24	7:25	7:25	7:26	7:27	7:27	7:28	7:28	7:29	7:29	7:30	7:30	7:31	7:31	7:32	7:32	7:33	7:33	7:34	7:35	7:35	7:36	7:36

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.4	7:58	7:21
2	11.4	7:56	7:21
3	11.4	7:55	7:22
4	11.5	7:54	7:22
5	11.5	7:53	7:23
6	11.5	7:52	7:23
7	11.6	7:50	7:24
8	11.6	7:49	7:24
9	11.6	7:48	7:25
10	11.6	7:47	7:25
11	11.7	7:45	7:26
12	11.7	7:44	7:27
13	11.7	7:43	7:27
14	11.8	7:42	7:28
15	11.8	7:40	7:28
16	11.8	7:39	7:29
17	11.9	7:38	7:29
18	11.9	7:36	7:30
19	11.9	7:35	7:30
20	11.9	7:34	7:31
21	12.0	7:33	7:31
22	12.0	7:31	7:32
23	12.0	7:30	7:32
24	12.1	7:29	7:33
25	12.1	7:28	7:33
26	12.1	7:26	7:34
27	12.2	7:25	7:35
28	12.2	7:24	7:35
29	12.2	7:23	7:36
30	12.2	7:21	7:36

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.45 kWh/m².

For context, solar energy here swings from a low near 2.52 kWh/m² to a high of 6.78 kWh/m² in December across the year — September's 4.45 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)	4.0	4.1	4.1	4.1	4.1	4.2	4.2	4.2	4.2	4.3	4.3	4.3	4.3	4.4	4.4	4.5	4.5	4.5	4.6	4.6	4.6	4.7	4.7	4.7	4.8	4.8	4.8	4.8	4.8	4.8
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	4.0	Bright
2	4.1	Bright
3	4.1	Bright
4	4.1	Bright
5	4.1	Bright
6	4.2	Bright
7	4.2	Bright
8	4.2	Bright
9	4.2	Bright
10	4.3	Bright
11	4.3	Bright
12	4.3	Bright
13	4.3	Bright
14	4.4	Bright
15	4.4	Bright
16	4.5	Bright
17	4.5	Bright
18	4.5	Bright
19	4.6	Bright
20	4.6	Bright
21	4.6	Bright
22	4.7	Bright
23	4.7	Bright
24	4.7	Bright
25	4.8	Bright
26	4.8	Bright
27	4.8	Bright
28	4.8	Bright
29	4.8	Bright
30	4.8	Bright

Planning a trip in September

Is September a good time to visit Santiago?

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

6.6

Sightseeing

3rd-best month of the year

4.7

Beach & pool

8th-best month of the year

September is a reasonable time to visit Santiago for sightseeing.

What to pack for Santiago in September

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

In September, Santiago sees daytime highs around 22°C and nights near 12°C. Worth packing: light clothes and rain gear. About 11 days see rain.

light clothesrain gear

UV index in Santiago in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santiago peaks around January 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 3 (moderate).

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)	14	13	10	8	5	3	4	5	8	6	11	12
Level	Extreme	Extreme	Extreme	Very high	Moderate	Moderate	Moderate	Moderate	Very high	High	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	13	Extreme
Mar	10	Extreme
Apr	8	Very high
May	5	Moderate
Jun	3	Moderate
Jul	4	Moderate
Aug	5	Moderate
Sep	8	Very high
Oct	6	High
Nov	11	Extreme
Dec	12	Extreme

Location & terrain

Where is Santiago?

Santiago sits at 29.2°S, 54.9°W, 426 m above sea level, in Brazil. The nearest listed city is São Francisco de Assis, 47 km away.

Topography around Santiago

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

Within 3 km, the terrain around Santiago has only modest variations in elevation — a maximum elevation change of 127 m around an average of 392 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 285 m; within 80 km, significant variations in elevation — a maximum elevation change of 475 m.

The land around Santiago is covered by grassland (39%), artificial surfaces (31%) and trees (26%) within 3 km, grassland (53%) and trees (27%) within 16 km, and cropland (41%), grassland (38%) and trees (20%) within 80 km.

3 km

127 m

grassland 39%

16 km

285 m

grassland 53%

80 km

475 m

cropland 41%

treesgrasslandcroplandartificial surfaces

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

September weather nearby: São Francisco de Assis 47 km · São Pedro do Sul 82 km · São Luiz Gonzaga 88 km · Tupanciretã 101 km · Alegrete 111 km · Júlio de Castilhos 115 km · Santo Ângelo 115 km · Santa Maria 116 km

Brazil travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / N; 127 / 220 V · 60 Hz
Prices: ≈ 46% of US; price level, 2025
GDP per capita: $10,713; 2025
Happiness: 6.6 / 10; World Happiness, 2025
Safe drinking water: 89%; of population, 2024
Homicide rate: 19.3; per 100k, 2023
Road deaths: 16; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Low; EF EPI 482
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 Santiago (-29.1917°, -54.8672°, elevation 426 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. 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	22	12
2	22	12
3	22	12
4	22	12
5	22	12
6	22	12
7	22	12
8	22	12
9	22	12
10	22	12
11	22	12
12	22	12
13	22	12
14	22	12
15	22	12
16	22	12
17	22	12
18	22	12
19	22	12
20	22	12
21	22	12
22	22	13
23	22	13
24	23	13
25	23	13
26	23	13
27	23	13
28	23	13
29	23	13
30	23	13

	Clearer (%)	Cloudier (%)
1	52	48
2	52	48
3	51	49
4	50	50
5	49	51
6	49	51
7	47	53
8	47	53
9	47	53
10	47	53
11	47	53
12	47	53
13	47	53
14	48	52
15	48	52
16	48	52
17	49	51
18	49	51
19	49	51
20	51	49
21	51	49
22	51	49
23	51	49
24	51	49
25	50	50
26	50	50
27	50	50
28	48	52
29	48	52
30	47	53

	Rain chance (%)
1	33
2	34
3	34
4	35
5	35
6	36
7	36
8	36
9	36
10	36
11	36
12	36
13	37
14	37
15	36
16	36
17	36
18	36
19	35
20	35
21	35
22	35
23	35
24	35
25	35
26	36
27	36
28	37
29	37
30	37

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	53	24	21	2
2	54	23	21	2
3	53	23	22	2
4	53	23	22	2
5	53	23	22	2
6	53	23	22	2
7	54	22	22	2
8	52	23	22	3
9	53	23	21	3
10	53	23	21	3
11	53	23	21	3
12	53	23	21	3
13	52	24	21	3
14	53	24	20	3
15	52	24	20	4
16	51	25	20	4
17	52	25	19	4
18	52	25	19	4
19	52	25	19	4
20	50	26	19	5
21	50	26	19	5
22	50	27	19	5
23	49	27	19	5
24	48	27	19	6
25	47	28	19	6
26	46	28	20	7
27	45	28	20	7
28	44	28	20	8
29	43	28	20	8
30	42	28	20	9

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

	Clearer (%)	Cloudier (%)
1	52	48
2	52	48
3	51	49
4	50	50
5	49	51
6	49	51
7	47	53
8	47	53
9	47	53
10	47	53
11	47	53
12	47	53
13	47	53
14	48	52
15	48	52
16	48	52
17	49	51
18	49	51
19	49	51
20	51	49
21	51	49
22	51	49
23	51	49
24	51	49
25	50	50
26	50	50
27	50	50
28	48	52
29	48	52
30	47	53

	Rain chance (%)
1	33
2	34
3	34
4	35
5	35
6	36
7	36
8	36
9	36
10	36
11	36
12	36
13	37
14	37
15	36
16	36
17	36
18	36
19	35
20	35
21	35
22	35
23	35
24	35
25	35
26	36
27	36
28	37
29	37
30	37

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	53	24	21	2
2	54	23	21	2
3	53	23	22	2
4	53	23	22	2
5	53	23	22	2
6	53	23	22	2
7	54	22	22	2
8	52	23	22	3
9	53	23	21	3
10	53	23	21	3
11	53	23	21	3
12	53	23	21	3
13	52	24	21	3
14	53	24	20	3
15	52	24	20	4
16	51	25	20	4
17	52	25	19	4
18	52	25	19	4
19	52	25	19	4
20	50	26	19	5
21	50	26	19	5
22	50	27	19	5
23	49	27	19	5
24	48	27	19	6
25	47	28	19	6
26	46	28	20	7
27	45	28	20	7
28	44	28	20	8
29	43	28	20	8
30	42	28	20	9

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

	Clearer (%)	Cloudier (%)
1	52	48
2	52	48
3	51	49
4	50	50
5	49	51
6	49	51
7	47	53
8	47	53
9	47	53
10	47	53
11	47	53
12	47	53
13	47	53
14	48	52
15	48	52
16	48	52
17	49	51
18	49	51
19	49	51
20	51	49
21	51	49
22	51	49
23	51	49
24	51	49
25	50	50
26	50	50
27	50	50
28	48	52
29	48	52
30	47	53

	Rain chance (%)
1	33
2	34
3	34
4	35
5	35
6	36
7	36
8	36
9	36
10	36
11	36
12	36
13	37
14	37
15	36
16	36
17	36
18	36
19	35
20	35
21	35
22	35
23	35
24	35
25	35
26	36
27	36
28	37
29	37
30	37

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	53	24	21	2
2	54	23	21	2
3	53	23	22	2
4	53	23	22	2
5	53	23	22	2
6	53	23	22	2
7	54	22	22	2
8	52	23	22	3
9	53	23	21	3
10	53	23	21	3
11	53	23	21	3
12	53	23	21	3
13	52	24	21	3
14	53	24	20	3
15	52	24	20	4
16	51	25	20	4
17	52	25	19	4
18	52	25	19	4
19	52	25	19	4
20	50	26	19	5
21	50	26	19	5
22	50	27	19	5
23	49	27	19	5
24	48	27	19	6
25	47	28	19	6
26	46	28	20	7
27	45	28	20	7
28	44	28	20	8
29	43	28	20	8
30	42	28	20	9