Rio Grande weather in September

In September, Rio Grande sees average daytime highs of 16°C and overnight lows near 14°C, with 125 mm of rain across 10.4 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 16°C through the month. The sky is clear or mostly clear about 34% 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 Rio Grande's 10th-clearest and 3rd-windiest month. For the whole year in context, see Rio Grande's year-round climate.

Daytime high: 16°; 9th warmest
Overnight low: 14°; 4th coldest
Rainfall: 125 mm; 10.4 wet days
Daylight: 11 h 48 min; 7:29 AM – 7:17 PM
Cloud cover: 59%; 10th clearest
Wind: 24 km/h; 3rd windiest
Solar energy: 4.25 kWh/m²
Travel score: 5.1; out of 10

Rio Grande is municipality of Rio Grande do Sul state, Brazil.

Density: 67/km²; people per km²
Founded: 1737

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

← August Rio 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 16°C through the month.

A typical September day in Rio Grande reaches about 16°C in the afternoon and slips back to 14°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 19°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)	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	17	17	17	17	17	17	17	17	17	17
Avg low (°C)	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	14	15	15	15	15	15	15	15	15

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

Rio 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	24° / 22°	87	8.6	13.9	7.4
Feb	24° / 23°	84	9.7	13.2	7.0
Mar	24° / 22°	92	10	12.2	7.1
Apr	21° / 19°	113	10.2	11.2	6.6
May	19° / 16°	104	9.7	10.4	6.1
Jun	16° / 14°	110	9.7	9.9	5.0
Jul	15° / 12°	112	10.2	10.1	4.4
Aug	15° / 13°	108	9.7	10.8	4.8
Sep	16° / 14°	125	10.4	11.8	5.1
Oct	18° / 17°	129	10.2	12.8	6.0
Nov	21° / 19°	87	7.7	13.6	6.8
Dec	23° / 21°	86	7.8	14.1	7.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 34% 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 54%.

	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 (%)	45	45	46	46	45	45	44	44	44	44	45	46	46	46	47	45	46	47	47	47	47	47	47	47	46	47	46	46	45	45
Cloudier (%)	55	55	54	54	55	55	56	56	56	56	55	54	54	54	53	55	54	53	53	53	53	53	53	53	54	53	54	54	55	55

	Clearer (%)	Cloudier (%)
1	45	55
2	45	55
3	46	54
4	46	54
5	45	55
6	45	55
7	44	56
8	44	56
9	44	56
10	44	56
11	45	55
12	46	54
13	46	54
14	46	54
15	47	53
16	45	55
17	46	54
18	47	53
19	47	53
20	47	53
21	47	53
22	47	53
23	47	53
24	47	53
25	46	54
26	47	53
27	46	54
28	46	54
29	45	55
30	45	55

Chance of precipitation in September

Any precipitation

Rio Grande gets around 125 mm of rain over 10.4 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 35% and peaks near 38% 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 (%)	36	37	37	37	37	38	38	37	37	37	36	35	35	34	34	34	33	33	33	33	32	32	32	32	32	33	33	33	34	34

	Rain chance (%)
1	36
2	37
3	37
4	37
5	37
6	38
7	38
8	37
9	37
10	37
11	36
12	35
13	35
14	34
15	34
16	34
17	33
18	33
19	33
20	33
21	32
22	32
23	32
24	32
25	32
26	33
27	33
28	33
29	34
30	34

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 52% 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 (%)	54	54	54	54	54	55	55	55	55	54	54	54	54	54	54	54	54	54	54	54	52	52	51	50	49	48	47	46	45	44
Comfortable (%)	35	35	35	35	35	34	34	34	34	35	35	35	35	35	35	35	35	35	35	35	36	36	36	37	37	37	37	37	37	37
Humid (%)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	12	12	13	13	14	15	16	17	18	19

	Dry (%)	Comfortable (%)	Humid (%)
1	54	35	11
2	54	35	11
3	54	35	11
4	54	35	11
5	54	35	11
6	55	34	11
7	55	34	11
8	55	34	11
9	55	34	11
10	54	35	11
11	54	35	11
12	54	35	11
13	54	35	11
14	54	35	11
15	54	35	11
16	54	35	11
17	54	35	11
18	54	35	11
19	54	35	11
20	54	35	11
21	52	36	12
22	52	36	12
23	51	36	13
24	50	37	13
25	49	37	14
26	48	37	15
27	47	37	16
28	46	37	17
29	45	37	18
30	44	37	19

Wind in September

Winds average 24 km/h in September.

Across September, daily wind ranges from about 23 km/h on the calmest days to 24 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)	23	23	23	23	23	23	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24	24
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

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

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 7:49 AM to 7:09 AM, and sunset from 7:07 PM to 7:26 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)	7:49	7:47	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	7:29	7:27	7:26	7:24	7:23	7:22	7:20	7:19	7:18	7:16	7:15	7:13	7:12	7:11	7:09
Sunset (PM)	7:07	7:08	7:09	7:09	7:10	7:11	7:11	7:12	7:12	7:13	7:14	7:14	7:15	7:16	7:16	7:17	7:18	7:18	7:19	7:19	7:20	7:21	7:21	7:22	7:23	7:23	7:24	7:25	7:25	7:26

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.3	7:49	7:07
2	11.3	7:47	7:08
3	11.4	7:46	7:09
4	11.4	7:45	7:09
5	11.4	7:44	7:10
6	11.5	7:42	7:11
7	11.5	7:41	7:11
8	11.5	7:39	7:12
9	11.6	7:38	7:12
10	11.6	7:37	7:13
11	11.6	7:35	7:14
12	11.7	7:34	7:14
13	11.7	7:33	7:15
14	11.7	7:31	7:16
15	11.8	7:30	7:16
16	11.8	7:29	7:17
17	11.8	7:27	7:18
18	11.9	7:26	7:18
19	11.9	7:24	7:19
20	11.9	7:23	7:19
21	12.0	7:22	7:20
22	12.0	7:20	7:21
23	12.0	7:19	7:21
24	12.1	7:18	7:22
25	12.1	7:16	7:23
26	12.1	7:15	7:23
27	12.2	7:13	7:24
28	12.2	7:12	7:25
29	12.2	7:11	7:25
30	12.3	7:09	7:26

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 2.38 kWh/m² to a high of 7.08 kWh/m² in December across the year — September's 4.25 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)	3.7	3.8	3.8	3.8	3.9	3.9	3.9	4.0	4.0	4.0	4.1	4.1	4.1	4.2	4.2	4.3	4.3	4.3	4.4	4.4	4.5	4.5	4.5	4.6	4.6	4.6	4.7	4.7	4.7	4.8
Level	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	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.7	Moderate
2	3.8	Moderate
3	3.8	Moderate
4	3.8	Moderate
5	3.9	Moderate
6	3.9	Moderate
7	3.9	Moderate
8	4.0	Moderate
9	4.0	Moderate
10	4.0	Bright
11	4.1	Bright
12	4.1	Bright
13	4.1	Bright
14	4.2	Bright
15	4.2	Bright
16	4.3	Bright
17	4.3	Bright
18	4.3	Bright
19	4.4	Bright
20	4.4	Bright
21	4.5	Bright
22	4.5	Bright
23	4.5	Bright
24	4.6	Bright
25	4.6	Bright
26	4.6	Bright
27	4.7	Bright
28	4.7	Bright
29	4.7	Bright
30	4.8	Bright

Planning a trip in September

Is September a good time to visit Rio Grande?

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

5.1

Sightseeing

9th-best month of the year

0.9

Beach & pool

9th-best month of the year

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

What to pack for Rio Grande in September

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

In September, Rio Grande sees daytime highs around 16°C and nights near 14°C. Worth packing: a warm layer, rain gear and a windbreaker. About 10 days see rain.

a warm layerrain geara windbreaker

Sea temperature near Rio Grande in September

The nearest coast averages about 15°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in February at about 24°C and coldest in July near 14°C.

It's comfortable for a long swim from Nov 18 to May 4 — about 5.5 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	24	24	24	22	19	16	14	14	15	18	20	22
Comfort	Refreshing	Warm	Refreshing	Refreshing	Cool	Cool	Bracing	Bracing	Cool	Cool	Cool	Refreshing

	Sea temperature (°C)	Comfort
Jan	24	Refreshing
Feb	24	Warm
Mar	24	Refreshing
Apr	22	Refreshing
May	19	Cool
Jun	16	Cool
Jul	14	Bracing
Aug	14	Bracing
Sep	15	Cool
Oct	18	Cool
Nov	20	Cool
Dec	22	Refreshing

UV index in Rio 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 Rio Grande peaks around January 16 at about 12 (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)	12	12	9	7	4	3	3	5	7	7	11	12
Level	Extreme	Extreme	Very high	High	Moderate	Moderate	Moderate	Moderate	High	Very high	Extreme	Extreme

	UV index (midday)	Level
Jan	12	Extreme
Feb	12	Extreme
Mar	9	Very high
Apr	7	High
May	4	Moderate
Jun	3	Moderate
Jul	3	Moderate
Aug	5	Moderate
Sep	7	High
Oct	7	Very high
Nov	11	Extreme
Dec	12	Extreme

Location & terrain

Where is Rio Grande?

Rio Grande sits at 32.0°S, 52.1°W, 7 m above sea level, in Brazil. The nearest listed city is São José do Norte, 6.0 km away.

Topography around Rio Grande

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

Within 3 km, the terrain around Rio Grande has only modest variations in elevation — a maximum elevation change of 11 m around an average of 1 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 33 m; within 80 km, significant variations in elevation — a maximum elevation change of 357 m.

The land around Rio Grande is covered by water (61%) and artificial surfaces (29%) within 3 km, water (52%) and grassland (20%) within 16 km, and water (48%) within 80 km.

3 km

11 m

water 61%

16 km

33 m

water 52%

80 km

357 m

water 48%

treesgrasslandcroplandartificial surfacesbare terrainwaterwetland

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

September weather nearby: São José do Norte 6.0 km · Pelotas 37 km · Capão do Leão 47 km · São Lourenço do Sul 75 km · Canguçu 90 km · Arroio Grande 96 km · Piratini 115 km · Jaguarão 134 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 Rio Grande (-32.035°, -52.0986°, elevation 7 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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	16	14
2	16	14
3	16	14
4	16	14
5	16	14
6	16	14
7	16	14
8	16	14
9	16	14
10	16	14
11	16	14
12	16	14
13	16	14
14	16	14
15	16	14
16	16	14
17	16	14
18	16	14
19	16	14
20	16	14
21	17	14
22	17	14
23	17	15
24	17	15
25	17	15
26	17	15
27	17	15
28	17	15
29	17	15
30	17	15

	Clearer (%)	Cloudier (%)
1	45	55
2	45	55
3	46	54
4	46	54
5	45	55
6	45	55
7	44	56
8	44	56
9	44	56
10	44	56
11	45	55
12	46	54
13	46	54
14	46	54
15	47	53
16	45	55
17	46	54
18	47	53
19	47	53
20	47	53
21	47	53
22	47	53
23	47	53
24	47	53
25	46	54
26	47	53
27	46	54
28	46	54
29	45	55
30	45	55

	Rain chance (%)
1	36
2	37
3	37
4	37
5	37
6	38
7	38
8	37
9	37
10	37
11	36
12	35
13	35
14	34
15	34
16	34
17	33
18	33
19	33
20	33
21	32
22	32
23	32
24	32
25	32
26	33
27	33
28	33
29	34
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	54	35	11
2	54	35	11
3	54	35	11
4	54	35	11
5	54	35	11
6	55	34	11
7	55	34	11
8	55	34	11
9	55	34	11
10	54	35	11
11	54	35	11
12	54	35	11
13	54	35	11
14	54	35	11
15	54	35	11
16	54	35	11
17	54	35	11
18	54	35	11
19	54	35	11
20	54	35	11
21	52	36	12
22	52	36	12
23	51	36	13
24	50	37	13
25	49	37	14
26	48	37	15
27	47	37	16
28	46	37	17
29	45	37	18
30	44	37	19

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

	Clearer (%)	Cloudier (%)
1	45	55
2	45	55
3	46	54
4	46	54
5	45	55
6	45	55
7	44	56
8	44	56
9	44	56
10	44	56
11	45	55
12	46	54
13	46	54
14	46	54
15	47	53
16	45	55
17	46	54
18	47	53
19	47	53
20	47	53
21	47	53
22	47	53
23	47	53
24	47	53
25	46	54
26	47	53
27	46	54
28	46	54
29	45	55
30	45	55

	Rain chance (%)
1	36
2	37
3	37
4	37
5	37
6	38
7	38
8	37
9	37
10	37
11	36
12	35
13	35
14	34
15	34
16	34
17	33
18	33
19	33
20	33
21	32
22	32
23	32
24	32
25	32
26	33
27	33
28	33
29	34
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	54	35	11
2	54	35	11
3	54	35	11
4	54	35	11
5	54	35	11
6	55	34	11
7	55	34	11
8	55	34	11
9	55	34	11
10	54	35	11
11	54	35	11
12	54	35	11
13	54	35	11
14	54	35	11
15	54	35	11
16	54	35	11
17	54	35	11
18	54	35	11
19	54	35	11
20	54	35	11
21	52	36	12
22	52	36	12
23	51	36	13
24	50	37	13
25	49	37	14
26	48	37	15
27	47	37	16
28	46	37	17
29	45	37	18
30	44	37	19

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

	Clearer (%)	Cloudier (%)
1	45	55
2	45	55
3	46	54
4	46	54
5	45	55
6	45	55
7	44	56
8	44	56
9	44	56
10	44	56
11	45	55
12	46	54
13	46	54
14	46	54
15	47	53
16	45	55
17	46	54
18	47	53
19	47	53
20	47	53
21	47	53
22	47	53
23	47	53
24	47	53
25	46	54
26	47	53
27	46	54
28	46	54
29	45	55
30	45	55

	Rain chance (%)
1	36
2	37
3	37
4	37
5	37
6	38
7	38
8	37
9	37
10	37
11	36
12	35
13	35
14	34
15	34
16	34
17	33
18	33
19	33
20	33
21	32
22	32
23	32
24	32
25	32
26	33
27	33
28	33
29	34
30	34

	Dry (%)	Comfortable (%)	Humid (%)
1	54	35	11
2	54	35	11
3	54	35	11
4	54	35	11
5	54	35	11
6	55	34	11
7	55	34	11
8	55	34	11
9	55	34	11
10	54	35	11
11	54	35	11
12	54	35	11
13	54	35	11
14	54	35	11
15	54	35	11
16	54	35	11
17	54	35	11
18	54	35	11
19	54	35	11
20	54	35	11
21	52	36	12
22	52	36	12
23	51	36	13
24	50	37	13
25	49	37	14
26	48	37	15
27	47	37	16
28	46	37	17
29	45	37	18
30	44	37	19