Arroio Grande weather in September

In September, Arroio Grande sees average daytime highs of 19°C and overnight lows near 12°C, with 124 mm of rain across 10.2 wet days and about 11.8 hours of daylight. It is the 9th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 19°C through the month. The sky is clear or mostly clear about 28% of the time in September, and the air most often feels dry.

Daylight stretches from about 11 h 18 min at the start of September to 12 h 18 min by month's end. Set against the rest of the year, September is Arroio Grande's 11th-clearest and 2nd-windiest month. For the whole year in context, see Arroio Grande's year-round climate.

Daytime high: 19°; 9th warmest
Overnight low: 12°; 4th coldest
Rainfall: 124 mm; 10.2 wet days
Daylight: 11 h 48 min; 7:33 AM – 7:21 PM
Cloud cover: 63%; 11th clearest
Wind: 15 km/h; 2nd windiest
Solar energy: 4.13 kWh/m²
Travel score: 6.0; out of 10

Arroio Grande is human settlement in Brazil.

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

← August Arroio Grande 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 19°C through the month.

A typical September day in Arroio Grande reaches about 19°C in the afternoon and slips back to 12°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 24°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)	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19	20	20	20	20	20	20
Avg low (°C)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	12	12	12	12	12	12	13

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

Arroio Grande weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	28° / 20°	111	10.6	13.9	6.3
Feb	27° / 20°	107	11.2	13.2	6.1
Mar	26° / 19°	103	9.9	12.2	6.7
Apr	23° / 16°	124	9.8	11.2	6.9
May	20° / 13°	96	9	10.4	6.4
Jun	17° / 10°	110	9.3	9.9	5.5
Jul	16° / 9°	107	9.3	10.1	5.3
Aug	18° / 10°	107	8.9	10.8	6.0
Sep	19° / 12°	124	10.2	11.8	6.0
Oct	22° / 14°	133	10.4	12.8	6.4
Nov	24° / 16°	98	8.2	13.7	7.2
Dec	27° / 18°	96	9.5	14.1	6.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 60%.

	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 (%)	41	41	41	41	40	39	39	39	40	40	41	40	40	41	40	40	41	42	41	42	41	42	41	41	40	41	40	40	39	39
Cloudier (%)	59	59	59	59	60	61	61	61	60	60	59	60	60	59	60	60	59	58	59	58	59	58	59	59	60	59	60	60	61	61

	Clearer (%)	Cloudier (%)
1	41	59
2	41	59
3	41	59
4	41	59
5	40	60
6	39	61
7	39	61
8	39	61
9	40	60
10	40	60
11	41	59
12	40	60
13	40	60
14	41	59
15	40	60
16	40	60
17	41	59
18	42	58
19	41	59
20	42	58
21	41	59
22	42	58
23	41	59
24	41	59
25	40	60
26	41	59
27	40	60
28	40	60
29	39	61
30	39	61

Chance of precipitation in September

Any precipitation

Arroio Grande gets around 124 mm of rain over 10.2 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 34% and peaks near 36% 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 (%)	35	35	35	36	36	36	36	36	36	35	35	34	34	34	33	33	33	33	32	32	32	32	33	33	33	34	34	35	35	35

	Rain chance (%)
1	35
2	35
3	35
4	36
5	36
6	36
7	36
8	36
9	36
10	35
11	35
12	34
13	34
14	34
15	33
16	33
17	33
18	33
19	32
20	32
21	32
22	32
23	33
24	33
25	33
26	34
27	34
28	35
29	35
30	35

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 61% 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 (%)	62	61	61	62	62	62	62	62	62	62	62	62	63	62	62	63	63	63	63	63	62	61	60	59	59	57	56	55	53	53
Comfortable (%)	25	25	25	24	24	24	24	24	24	24	24	24	24	25	25	25	25	25	25	25	26	26	27	27	27	28	28	28	29	29
Humid (%)	12	13	13	13	13	13	13	13	13	13	13	13	12	12	12	11	11	11	11	11	11	12	12	13	13	14	15	16	17	17
Muggy (%)	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	62	25	12	1
2	61	25	13	1
3	61	25	13	1
4	62	24	13	1
5	62	24	13	1
6	62	24	13	1
7	62	24	13	1
8	62	24	13	1
9	62	24	13	1
10	62	24	13	1
11	62	24	13	1
12	62	24	13	1
13	63	24	12	1
14	62	25	12	1
15	62	25	12	1
16	63	25	11	1
17	63	25	11	1
18	63	25	11	1
19	63	25	11	1
20	63	25	11	1
21	62	26	11	1
22	61	26	12	1
23	60	27	12	1
24	59	27	13	1
25	59	27	13	1
26	57	28	14	1
27	56	28	15	1
28	55	28	16	1
29	53	29	17	1
30	53	29	17	1

Wind in September

Winds average 15 km/h in September.

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 11 h 18 min at the start of September to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over September. Sunrise moves from 7:53 AM to 7:13 AM, and sunset from 7:11 PM to 7:30 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)	11.3	11.3	11.4	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.8	11.9	11.9	11.9	12.0	12.0	12.0	12.1	12.1	12.1	12.2	12.2	12.2	12.3
Sunrise (AM)	7:53	7:52	7:50	7:49	7:48	7:46	7:45	7:44	7:42	7:41	7:39	7:38	7:37	7:35	7:34	7:33	7:31	7:30	7:28	7:27	7:26	7:24	7:23	7:21	7:20	7:19	7:17	7:16	7:15	7:13
Sunset (PM)	7:11	7:12	7:13	7:13	7:14	7:14	7:15	7:16	7:16	7:17	7:18	7:18	7:19	7:20	7:20	7:21	7:21	7:22	7:23	7:23	7:24	7:25	7:25	7:26	7:27	7:27	7:28	7:29	7:29	7:30

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	7:53	7:11
2	11.3	7:52	7:12
3	11.4	7:50	7:13
4	11.4	7:49	7:13
5	11.4	7:48	7:14
6	11.5	7:46	7:14
7	11.5	7:45	7:15
8	11.5	7:44	7:16
9	11.6	7:42	7:16
10	11.6	7:41	7:17
11	11.6	7:39	7:18
12	11.7	7:38	7:18
13	11.7	7:37	7:19
14	11.7	7:35	7:20
15	11.8	7:34	7:20
16	11.8	7:33	7:21
17	11.8	7:31	7:21
18	11.9	7:30	7:22
19	11.9	7:28	7:23
20	11.9	7:27	7:23
21	12.0	7:26	7:24
22	12.0	7:24	7:25
23	12.0	7:23	7:25
24	12.1	7:21	7:26
25	12.1	7:20	7:27
26	12.1	7:19	7:27
27	12.2	7:17	7:28
28	12.2	7:16	7:29
29	12.2	7:15	7:29
30	12.3	7:13	7:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.13 kWh/m².

For context, solar energy here swings from a low near 2.3 kWh/m² to a high of 6.9 kWh/m² in December across the year — September's 4.13 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)	3.6	3.6	3.7	3.7	3.7	3.8	3.8	3.8	3.9	3.9	3.9	4.0	4.0	4.0	4.1	4.1	4.2	4.2	4.3	4.3	4.3	4.4	4.4	4.5	4.5	4.5	4.5	4.5	4.6	4.6
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.6	Moderate
2	3.6	Moderate
3	3.7	Moderate
4	3.7	Moderate
5	3.7	Moderate
6	3.8	Moderate
7	3.8	Moderate
8	3.8	Moderate
9	3.9	Moderate
10	3.9	Moderate
11	3.9	Moderate
12	4.0	Moderate
13	4.0	Bright
14	4.0	Bright
15	4.1	Bright
16	4.1	Bright
17	4.2	Bright
18	4.2	Bright
19	4.3	Bright
20	4.3	Bright
21	4.3	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	4.6	Bright
30	4.6	Bright

Planning a trip in September

Is September a good time to visit Arroio Grande?

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

6.0

Sightseeing

9th-best month of the year

2.7

Beach & pool

9th-best month of the year

September is a reasonable time to visit Arroio Grande for sightseeing.

What to pack for Arroio Grande in September

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

In September, Arroio Grande sees daytime highs around 19°C and nights near 12°C. Worth packing: rain gear. About 10 days see rain.

rain gear

UV index in Arroio Grande in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Arroio Grande peaks around January 15 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	12	10	6	4	3	3	4	7	7	11	12
Level	Extreme	Extreme	Very high	High	Moderate	Moderate	Moderate	Moderate	High	High	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	12	Extreme
Mar	10	Very high
Apr	6	High
May	4	Moderate
Jun	3	Moderate
Jul	3	Moderate
Aug	4	Moderate
Sep	7	High
Oct	7	High
Nov	11	Extreme
Dec	12	Extreme

Location & terrain

Where is Arroio Grande?

Arroio Grande sits at 32.2°S, 53.1°W, 31 m above sea level, in Brazil. The nearest listed city is Jaguarão, 46 km away.

Topography around Arroio Grande

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

Within 3 km, the terrain around Arroio Grande has only modest variations in elevation — a maximum elevation change of 62 m around an average of 33 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 240 m; within 80 km, significant variations in elevation — a maximum elevation change of 480 m.

The land around Arroio Grande is covered by cropland (34%), trees (27%) and grassland (26%) within 3 km, cropland (48%), grassland (25%) and trees (24%) within 16 km, and grassland (35%), cropland (22%) and trees (20%) within 80 km.

3 km

62 m

cropland 34%

16 km

240 m

cropland 48%

80 km

480 m

grassland 35%

treesgrasslandcroplandartificial surfaceswaterwetland

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

September weather nearby: Jaguarão 46 km · Capão do Leão 78 km · Pelotas 87 km · Piratini 88 km · Rio Grande 96 km · Canguçu 101 km · São José do Norte 101 km · Melo 102 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 Arroio Grande (-32.2375°, -53.0869°, elevation 31 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	19	11
2	19	11
3	19	11
4	19	11
5	19	11
6	19	11
7	19	11
8	19	11
9	19	11
10	19	11
11	19	11
12	19	11
13	19	11
14	19	11
15	19	11
16	19	12
17	19	12
18	19	12
19	19	12
20	19	12
21	19	12
22	19	12
23	19	12
24	19	12
25	20	12
26	20	12
27	20	12
28	20	12
29	20	12
30	20	13

	Clearer (%)	Cloudier (%)
1	41	59
2	41	59
3	41	59
4	41	59
5	40	60
6	39	61
7	39	61
8	39	61
9	40	60
10	40	60
11	41	59
12	40	60
13	40	60
14	41	59
15	40	60
16	40	60
17	41	59
18	42	58
19	41	59
20	42	58
21	41	59
22	42	58
23	41	59
24	41	59
25	40	60
26	41	59
27	40	60
28	40	60
29	39	61
30	39	61

	Rain chance (%)
1	35
2	35
3	35
4	36
5	36
6	36
7	36
8	36
9	36
10	35
11	35
12	34
13	34
14	34
15	33
16	33
17	33
18	33
19	32
20	32
21	32
22	32
23	33
24	33
25	33
26	34
27	34
28	35
29	35
30	35

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	62	25	12	1
2	61	25	13	1
3	61	25	13	1
4	62	24	13	1
5	62	24	13	1
6	62	24	13	1
7	62	24	13	1
8	62	24	13	1
9	62	24	13	1
10	62	24	13	1
11	62	24	13	1
12	62	24	13	1
13	63	24	12	1
14	62	25	12	1
15	62	25	12	1
16	63	25	11	1
17	63	25	11	1
18	63	25	11	1
19	63	25	11	1
20	63	25	11	1
21	62	26	11	1
22	61	26	12	1
23	60	27	12	1
24	59	27	13	1
25	59	27	13	1
26	57	28	14	1
27	56	28	15	1
28	55	28	16	1
29	53	29	17	1
30	53	29	17	1

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

	Clearer (%)	Cloudier (%)
1	41	59
2	41	59
3	41	59
4	41	59
5	40	60
6	39	61
7	39	61
8	39	61
9	40	60
10	40	60
11	41	59
12	40	60
13	40	60
14	41	59
15	40	60
16	40	60
17	41	59
18	42	58
19	41	59
20	42	58
21	41	59
22	42	58
23	41	59
24	41	59
25	40	60
26	41	59
27	40	60
28	40	60
29	39	61
30	39	61

	Rain chance (%)
1	35
2	35
3	35
4	36
5	36
6	36
7	36
8	36
9	36
10	35
11	35
12	34
13	34
14	34
15	33
16	33
17	33
18	33
19	32
20	32
21	32
22	32
23	33
24	33
25	33
26	34
27	34
28	35
29	35
30	35

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	62	25	12	1
2	61	25	13	1
3	61	25	13	1
4	62	24	13	1
5	62	24	13	1
6	62	24	13	1
7	62	24	13	1
8	62	24	13	1
9	62	24	13	1
10	62	24	13	1
11	62	24	13	1
12	62	24	13	1
13	63	24	12	1
14	62	25	12	1
15	62	25	12	1
16	63	25	11	1
17	63	25	11	1
18	63	25	11	1
19	63	25	11	1
20	63	25	11	1
21	62	26	11	1
22	61	26	12	1
23	60	27	12	1
24	59	27	13	1
25	59	27	13	1
26	57	28	14	1
27	56	28	15	1
28	55	28	16	1
29	53	29	17	1
30	53	29	17	1

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

	Clearer (%)	Cloudier (%)
1	41	59
2	41	59
3	41	59
4	41	59
5	40	60
6	39	61
7	39	61
8	39	61
9	40	60
10	40	60
11	41	59
12	40	60
13	40	60
14	41	59
15	40	60
16	40	60
17	41	59
18	42	58
19	41	59
20	42	58
21	41	59
22	42	58
23	41	59
24	41	59
25	40	60
26	41	59
27	40	60
28	40	60
29	39	61
30	39	61

	Rain chance (%)
1	35
2	35
3	35
4	36
5	36
6	36
7	36
8	36
9	36
10	35
11	35
12	34
13	34
14	34
15	33
16	33
17	33
18	33
19	32
20	32
21	32
22	32
23	33
24	33
25	33
26	34
27	34
28	35
29	35
30	35

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	62	25	12	1
2	61	25	13	1
3	61	25	13	1
4	62	24	13	1
5	62	24	13	1
6	62	24	13	1
7	62	24	13	1
8	62	24	13	1
9	62	24	13	1
10	62	24	13	1
11	62	24	13	1
12	62	24	13	1
13	63	24	12	1
14	62	25	12	1
15	62	25	12	1
16	63	25	11	1
17	63	25	11	1
18	63	25	11	1
19	63	25	11	1
20	63	25	11	1
21	62	26	11	1
22	61	26	12	1
23	60	27	12	1
24	59	27	13	1
25	59	27	13	1
26	57	28	14	1
27	56	28	15	1
28	55	28	16	1
29	53	29	17	1
30	53	29	17	1