São Marcos weather in September

In September, São Marcos sees average daytime highs of 20°C and overnight lows near 10°C, with 167 mm of rain across 12.4 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 20°C through the month. The sky is clear or mostly clear about 31% 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 São Marcos's 7th-clearest and 1st-windiest month. For the whole year in context, see São Marcos's year-round climate.

Daytime high: 20°; 8th warmest
Overnight low: 10°; 5th coldest
Rainfall: 167 mm; 12.4 wet days
Daylight: 11 h 48 min; 7:24 AM – 7:13 PM
Cloud cover: 61%; 7th clearest
Wind: 11 km/h; 1st windiest
Solar energy: 4.3 kWh/m²
Travel score: 5.9; out of 10

São Marcos is human settlement in Brazil.

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

← August São Marcos 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 20°C through the month.

A typical September day in São Marcos reaches about 20°C in the afternoon and slips back to 10°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 26°C. Set against its neighbours, September runs about 1°C warmer than August and about 2°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)	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	21
Avg low (°C)	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	11	11	11	11	11

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

São Marcos 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	26° / 17°	182	18	13.6	5.4
Feb	26° / 16°	160	17.3	13	5.3
Mar	25° / 15°	142	14.6	12.2	6.1
Apr	22° / 13°	125	11.3	11.3	6.4
May	19° / 10°	140	10.4	10.6	5.9
Jun	17° / 8°	136	10.5	10.2	5.4
Jul	17° / 7°	168	11	10.3	5.3
Aug	19° / 8°	128	10.2	11	6.2
Sep	20° / 10°	167	12.4	11.8	5.9
Oct	22° / 12°	210	14.5	12.7	5.9
Nov	24° / 13°	154	13.4	13.4	6.4
Dec	26° / 15°	172	15.5	13.8	5.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to cloud over as the month goes on.

	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 (%)	50	49	48	48	46	46	45	45	45	44	44	44	43	43	41	42	42	42	41	41	42	43	42	42	41	41	39	39	38	38
Cloudier (%)	50	51	52	52	54	54	55	55	55	56	56	56	57	57	59	58	58	58	59	59	58	57	58	58	59	59	61	61	62	62

	Clearer (%)	Cloudier (%)
1	50	50
2	49	51
3	48	52
4	48	52
5	46	54
6	46	54
7	45	55
8	45	55
9	45	55
10	44	56
11	44	56
12	44	56
13	43	57
14	43	57
15	41	59
16	42	58
17	42	58
18	42	58
19	41	59
20	41	59
21	42	58
22	43	57
23	42	58
24	42	58
25	41	59
26	41	59
27	39	61
28	39	61
29	38	62
30	38	62

Chance of precipitation in September

Any precipitation

São Marcos gets around 167 mm of rain over 12.4 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 41% and peaks near 46% on the wettest days. The odds climb toward the end of the month.

	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 (%)	35	35	36	36	36	37	37	38	38	39	39	40	40	41	42	42	43	43	44	44	44	44	44	45	45	45	45	45	45	46

	Rain chance (%)
1	35
2	35
3	36
4	36
5	36
6	37
7	37
8	38
9	38
10	39
11	39
12	40
13	40
14	41
15	42
16	42
17	43
18	43
19	44
20	44
21	44
22	44
23	44
24	45
25	45
26	45
27	45
28	45
29	45
30	46

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 65% 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 (%)	70	70	69	69	68	68	68	67	67	66	65	65	64	65	64	64	64	64	64	63	64	64	63	63	62	62	61	60	60	59
Comfortable (%)	26	26	27	27	28	28	28	29	29	29	30	30	30	29	29	29	29	28	28	28	27	27	27	27	27	27	28	28	28	28
Humid (%)	4	4	4	4	4	4	4	4	4	5	5	5	6	6	7	7	7	8	8	9	9	9	10	10	11	11	11	12	12	13

	Dry (%)	Comfortable (%)	Humid (%)
1	70	26	4
2	70	26	4
3	69	27	4
4	69	27	4
5	68	28	4
6	68	28	4
7	68	28	4
8	67	29	4
9	67	29	4
10	66	29	5
11	65	30	5
12	65	30	5
13	64	30	6
14	65	29	6
15	64	29	7
16	64	29	7
17	64	29	7
18	64	28	8
19	64	28	8
20	63	28	9
21	64	27	9
22	64	27	9
23	63	27	10
24	63	27	10
25	62	27	11
26	62	27	11
27	61	28	11
28	60	28	12
29	60	28	12
30	59	28	13

Wind in September

Winds average 11 km/h in September, the windiest month of the year.

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

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 7:42 AM to 7:06 AM, and sunset from 7:06 PM to 7:21 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	11.7	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)	7:42	7:41	7:40	7:39	7:37	7:36	7:35	7:34	7:33	7:31	7:30	7:29	7:28	7:26	7:25	7:24	7:22	7:21	7:20	7:19	7:17	7:16	7:15	7:14	7:12	7:11	7:10	7:09	7:07	7:06
Sunset (PM)	7:06	7:06	7:07	7:07	7:08	7:08	7:09	7:09	7:10	7:10	7:11	7:11	7:12	7:12	7:13	7:13	7:14	7:15	7:15	7:16	7:16	7:17	7:17	7:18	7:18	7:19	7:19	7:20	7:20	7:21

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.4	7:42	7:06
2	11.4	7:41	7:06
3	11.4	7:40	7:07
4	11.5	7:39	7:07
5	11.5	7:37	7:08
6	11.5	7:36	7:08
7	11.6	7:35	7:09
8	11.6	7:34	7:09
9	11.6	7:33	7:10
10	11.7	7:31	7:10
11	11.7	7:30	7:11
12	11.7	7:29	7:11
13	11.7	7:28	7:12
14	11.8	7:26	7:12
15	11.8	7:25	7:13
16	11.8	7:24	7:13
17	11.9	7:22	7:14
18	11.9	7:21	7:15
19	11.9	7:20	7:15
20	11.9	7:19	7:16
21	12.0	7:17	7:16
22	12.0	7:16	7:17
23	12.0	7:15	7:17
24	12.1	7:14	7:18
25	12.1	7:12	7:18
26	12.1	7:11	7:19
27	12.2	7:10	7:19
28	12.2	7:09	7:20
29	12.2	7:07	7:20
30	12.2	7:06	7:21

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.3 kWh/m².

For context, solar energy here swings from a low near 2.56 kWh/m² to a high of 6.35 kWh/m² in December across the year — September's 4.3 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	4.1	4.2	4.2	4.2	4.2	4.2	4.2	4.2	4.3	4.3	4.3	4.3	4.3	4.3	4.4	4.4	4.4	4.4	4.5	4.5	4.5	4.5	4.5	4.5	4.6
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	4.1	Bright
7	4.2	Bright
8	4.2	Bright
9	4.2	Bright
10	4.2	Bright
11	4.2	Bright
12	4.2	Bright
13	4.2	Bright
14	4.3	Bright
15	4.3	Bright
16	4.3	Bright
17	4.3	Bright
18	4.3	Bright
19	4.3	Bright
20	4.4	Bright
21	4.4	Bright
22	4.4	Bright
23	4.4	Bright
24	4.5	Bright
25	4.5	Bright
26	4.5	Bright
27	4.5	Bright
28	4.5	Bright
29	4.5	Bright
30	4.6	Bright

Planning a trip in September

Is September a good time to visit São Marcos?

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

5.9

Sightseeing

5th-best month of the year

3.2

Beach & pool

8th-best month of the year

September is a reasonable time to visit São Marcos for sightseeing.

What to pack for São Marcos in September

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

In September, São Marcos sees daytime highs around 20°C and nights near 10°C. Worth packing: rain gear. About 12 days see rain.

rain gear

UV index in São Marcos in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in São Marcos peaks around January 17 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 4 (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	11	8	5	4	4	6	8	8	12	13
Level	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate	High	Very high	Very high	Extreme	Extreme

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

Air quality in São Marcos 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 São Marcos is worst in August — around 22 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (February, 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)	10	9	10	11	12	12	15	22	18	12	11	10
Level	Good	Good	Good	Good	Moderate	Good	Moderate	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	10	Good
Feb	9	Good
Mar	10	Good
Apr	11	Good
May	12	Moderate
Jun	12	Good
Jul	15	Moderate
Aug	22	Moderate
Sep	18	Moderate
Oct	12	Good
Nov	11	Good
Dec	10	Good

Location & terrain

Where is São Marcos?

São Marcos sits at 29.0°S, 51.1°W, 741 m above sea level, in Brazil. The nearest listed city is Flores da Cunha, 13 km away.

Topography around São Marcos

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

Within 3 km, the terrain around São Marcos has significant variations in elevation — a maximum elevation change of 399 m around an average of 750 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 716 m; within 80 km, large variations in elevation — a maximum elevation change of 1,135 m.

The land around São Marcos is covered by trees (55%) and grassland (27%) within 3 km, trees (65%) and grassland (30%) within 16 km, and trees (59%) and grassland (24%) within 80 km.

3 km

399 m

trees 55%

16 km

716 m

trees 65%

80 km

1,135 m

trees 59%

treesgrasslandcroplandartificial surfaceswater

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

September weather nearby: Flores da Cunha 13 km · Caxias do Sul 24 km · Farroupilha 39 km · Nova Petrópolis 45 km · Veranópolis 47 km · Gramado 49 km · Bento Gonçalves 49 km · Canela 49 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 São Marcos (-28.9711°, -51.0681°, elevation 741 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	20	9
2	20	10
3	20	10
4	20	10
5	20	10
6	20	10
7	20	10
8	20	10
9	20	10
10	20	10
11	20	10
12	20	10
13	20	10
14	20	10
15	20	10
16	20	10
17	20	10
18	20	10
19	20	10
20	20	10
21	20	10
22	20	10
23	20	10
24	20	10
25	20	10
26	20	11
27	20	11
28	20	11
29	20	11
30	21	11

	Clearer (%)	Cloudier (%)
1	50	50
2	49	51
3	48	52
4	48	52
5	46	54
6	46	54
7	45	55
8	45	55
9	45	55
10	44	56
11	44	56
12	44	56
13	43	57
14	43	57
15	41	59
16	42	58
17	42	58
18	42	58
19	41	59
20	41	59
21	42	58
22	43	57
23	42	58
24	42	58
25	41	59
26	41	59
27	39	61
28	39	61
29	38	62
30	38	62

	Rain chance (%)
1	35
2	35
3	36
4	36
5	36
6	37
7	37
8	38
9	38
10	39
11	39
12	40
13	40
14	41
15	42
16	42
17	43
18	43
19	44
20	44
21	44
22	44
23	44
24	45
25	45
26	45
27	45
28	45
29	45
30	46

	Dry (%)	Comfortable (%)	Humid (%)
1	70	26	4
2	70	26	4
3	69	27	4
4	69	27	4
5	68	28	4
6	68	28	4
7	68	28	4
8	67	29	4
9	67	29	4
10	66	29	5
11	65	30	5
12	65	30	5
13	64	30	6
14	65	29	6
15	64	29	7
16	64	29	7
17	64	29	7
18	64	28	8
19	64	28	8
20	63	28	9
21	64	27	9
22	64	27	9
23	63	27	10
24	63	27	10
25	62	27	11
26	62	27	11
27	61	28	11
28	60	28	12
29	60	28	12
30	59	28	13

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

	Clearer (%)	Cloudier (%)
1	50	50
2	49	51
3	48	52
4	48	52
5	46	54
6	46	54
7	45	55
8	45	55
9	45	55
10	44	56
11	44	56
12	44	56
13	43	57
14	43	57
15	41	59
16	42	58
17	42	58
18	42	58
19	41	59
20	41	59
21	42	58
22	43	57
23	42	58
24	42	58
25	41	59
26	41	59
27	39	61
28	39	61
29	38	62
30	38	62

	Rain chance (%)
1	35
2	35
3	36
4	36
5	36
6	37
7	37
8	38
9	38
10	39
11	39
12	40
13	40
14	41
15	42
16	42
17	43
18	43
19	44
20	44
21	44
22	44
23	44
24	45
25	45
26	45
27	45
28	45
29	45
30	46

	Dry (%)	Comfortable (%)	Humid (%)
1	70	26	4
2	70	26	4
3	69	27	4
4	69	27	4
5	68	28	4
6	68	28	4
7	68	28	4
8	67	29	4
9	67	29	4
10	66	29	5
11	65	30	5
12	65	30	5
13	64	30	6
14	65	29	6
15	64	29	7
16	64	29	7
17	64	29	7
18	64	28	8
19	64	28	8
20	63	28	9
21	64	27	9
22	64	27	9
23	63	27	10
24	63	27	10
25	62	27	11
26	62	27	11
27	61	28	11
28	60	28	12
29	60	28	12
30	59	28	13

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

	Clearer (%)	Cloudier (%)
1	50	50
2	49	51
3	48	52
4	48	52
5	46	54
6	46	54
7	45	55
8	45	55
9	45	55
10	44	56
11	44	56
12	44	56
13	43	57
14	43	57
15	41	59
16	42	58
17	42	58
18	42	58
19	41	59
20	41	59
21	42	58
22	43	57
23	42	58
24	42	58
25	41	59
26	41	59
27	39	61
28	39	61
29	38	62
30	38	62

	Rain chance (%)
1	35
2	35
3	36
4	36
5	36
6	37
7	37
8	38
9	38
10	39
11	39
12	40
13	40
14	41
15	42
16	42
17	43
18	43
19	44
20	44
21	44
22	44
23	44
24	45
25	45
26	45
27	45
28	45
29	45
30	46

	Dry (%)	Comfortable (%)	Humid (%)
1	70	26	4
2	70	26	4
3	69	27	4
4	69	27	4
5	68	28	4
6	68	28	4
7	68	28	4
8	67	29	4
9	67	29	4
10	66	29	5
11	65	30	5
12	65	30	5
13	64	30	6
14	65	29	6
15	64	29	7
16	64	29	7
17	64	29	7
18	64	28	8
19	64	28	8
20	63	28	9
21	64	27	9
22	64	27	9
23	63	27	10
24	63	27	10
25	62	27	11
26	62	27	11
27	61	28	11
28	60	28	12
29	60	28	12
30	59	28	13