Rio Negro weather in August

In August, Rio Negro sees average daytime highs of 21°C and overnight lows near 10°C, with 84 mm of rain across 7.8 wet days and about 11.1 hours of daylight. It is the 9th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 22°C by the end. The sky is clear or mostly clear about 43% of the time in August, and the air most often feels dry.

Daylight stretches from about 10 h 48 min at the start of August to 11 h 24 min by month's end. Set against the rest of the year, August is Rio Negro's 1st-clearest and 6th-windiest month. For the whole year in context, see Rio Negro's year-round climate.

Daytime high: 21°; 9th warmest
Overnight low: 10°; 3rd coldest
Rainfall: 84 mm; 7.8 wet days
Daylight: 11 h 06 min; 7:51 AM – 6:56 PM
Cloud cover: 52%; 1st clearest
Wind: 10 km/h; 6th windiest
Solar energy: 3.88 kWh/m²
Travel score: 7.0; out of 10

Rio Negro is settlement in Brazil.

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

← July Rio Negro year-round climate September →Best places to visit in August

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 22°C by the end.

A typical August day in Rio Negro reaches about 21°C in the afternoon and slips back to 10°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 27°C. Set against its neighbours, August runs about 2°C warmer than July and about 1°C cooler than September.

	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	31
Avg high (°C)	20	20	20	20	20	20	21	21	21	21	21	21	21	21	21	21	21	21	21	21	22	22	22	22	22	22	22	22	22	22	22
Avg low (°C)	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	11	11	11	11	11	11	11	11	11	11	11	11

	Avg high (°C)	Avg low (°C)
1	20	10
2	20	10
3	20	10
4	20	10
5	20	10
6	20	10
7	21	10
8	21	10
9	21	10
10	21	10
11	21	10
12	21	10
13	21	10
14	21	10
15	21	10
16	21	10
17	21	10
18	21	10
19	21	10
20	21	11
21	22	11
22	22	11
23	22	11
24	22	11
25	22	11
26	22	11
27	22	11
28	22	11
29	22	11
30	22	11
31	22	11

Rio Negro weather by month

How August compares with the rest of the year at a glance. August is the 9th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	27° / 18°	183	19.9	13.5	4.9
Feb	27° / 18°	157	17.8	12.9	5.0
Mar	26° / 17°	106	14.2	12.2	5.9
Apr	24° / 15°	71	8.8	11.4	6.9
May	21° / 12°	94	8	10.7	6.6
Jun	19° / 10°	106	9.2	10.4	6.3
Jul	19° / 9°	86	8	10.5	6.5
Aug	21° / 10°	84	7.8	11.1	7.0
Sep	22° / 12°	145	10.8	11.8	6.4
Oct	23° / 14°	144	14.2	12.6	6.0
Nov	25° / 15°	123	13.9	13.3	6.0
Dec	26° / 17°	149	17	13.6	5.4

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of August, with mostly cloudy or overcast conditions the remaining 47%.

	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	31
Clearer (%)	53	53	53	54	54	54	54	52	52	52	50	50	50	50	49	50	50	51	51	52	52	53	53	55	55	55	55	55	55	54	54
Cloudier (%)	47	47	47	46	46	46	46	48	48	48	50	50	50	50	51	50	50	49	49	48	48	47	47	45	45	45	45	45	45	46	46

	Clearer (%)	Cloudier (%)
1	53	47
2	53	47
3	53	47
4	54	46
5	54	46
6	54	46
7	54	46
8	52	48
9	52	48
10	52	48
11	50	50
12	50	50
13	50	50
14	50	50
15	49	51
16	50	50
17	50	50
18	51	49
19	51	49
20	52	48
21	52	48
22	53	47
23	53	47
24	55	45
25	55	45
26	55	45
27	55	45
28	55	45
29	55	45
30	54	46
31	54	46

Chance of precipitation in August

Any precipitation

Rio Negro gets around 84 mm of rain over 7.8 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 25% and peaks near 26% 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	31
Rain chance (%)	25	25	25	25	25	25	25	25	25	25	25	26	26	26	26	26	26	26	25	25	25	25	25	25	25	25	25	25	25	25	25

	Rain chance (%)
1	25
2	25
3	25
4	25
5	25
6	25
7	25
8	25
9	25
10	25
11	25
12	26
13	26
14	26
15	26
16	26
17	26
18	26
19	25
20	25
21	25
22	25
23	25
24	25
25	25
26	25
27	25
28	25
29	25
30	25
31	25

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 70% 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	31
Dry (%)	77	76	75	75	75	74	74	73	73	72	72	72	71	71	71	71	71	71	70	70	69	68	68	67	65	65	64	63	62	61	60
Comfortable (%)	23	23	24	24	24	25	25	25	25	26	26	26	27	27	27	27	27	27	28	28	29	30	30	31	32	32	33	33	34	35	35
Humid (%)	0	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	3	3	3	4	4	4	5

	Dry (%)	Comfortable (%)	Humid (%)
1	77	23	0
2	76	23	1
3	75	24	1
4	75	24	1
5	75	24	1
6	74	25	1
7	74	25	1
8	73	25	2
9	73	25	2
10	72	26	2
11	72	26	2
12	72	26	2
13	71	27	2
14	71	27	2
15	71	27	2
16	71	27	2
17	71	27	2
18	71	27	2
19	70	28	2
20	70	28	2
21	69	29	2
22	68	30	2
23	68	30	2
24	67	31	2
25	65	32	3
26	65	32	3
27	64	33	3
28	63	33	4
29	62	34	4
30	61	35	4
31	60	35	5

Wind in August

Winds average 10 km/h in August.

Across August, daily wind ranges from about 10 km/h on the calmest days to 10 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	31
Wind speed (km/h)	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	10	10	10	10	10	10
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	calm

	Wind speed (km/h)	Feels
1	10	calm
2	10	calm
3	10	calm
4	10	calm
5	10	calm
6	10	calm
7	10	calm
8	10	calm
9	10	calm
10	10	calm
11	10	calm
12	10	calm
13	10	calm
14	10	calm
15	10	calm
16	10	calm
17	10	calm
18	10	calm
19	10	calm
20	10	calm
21	10	calm
22	10	calm
23	10	calm
24	10	calm
25	10	calm
26	10	calm
27	10	calm
28	10	calm
29	10	calm
30	10	calm
31	10	calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 10 h 48 min at the start of August to 11 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over August. Sunrise moves from 8:02 AM to 7:36 AM, and sunset from 6:48 PM to 7:02 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	31
Daylight (h)	10.8	10.8	10.8	10.8	10.8	10.9	10.9	10.9	10.9	10.9	11.0	11.0	11.0	11.0	11.1	11.1	11.1	11.1	11.1	11.2	11.2	11.2	11.2	11.3	11.3	11.3	11.3	11.4	11.4	11.4	11.4
Sunrise (AM)	8:02	8:02	8:01	8:00	8:00	7:59	7:58	7:58	7:57	7:56	7:55	7:54	7:54	7:53	7:52	7:51	7:50	7:49	7:48	7:47	7:46	7:45	7:44	7:43	7:42	7:41	7:40	7:39	7:38	7:37	7:36
Sunset (PM)	6:48	6:49	6:49	6:50	6:50	6:51	6:51	6:52	6:52	6:53	6:53	6:54	6:54	6:55	6:55	6:56	6:56	6:56	6:57	6:57	6:58	6:58	6:59	6:59	7:00	7:00	7:01	7:01	7:01	7:02	7:02

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.8	8:02	6:48
2	10.8	8:02	6:49
3	10.8	8:01	6:49
4	10.8	8:00	6:50
5	10.8	8:00	6:50
6	10.9	7:59	6:51
7	10.9	7:58	6:51
8	10.9	7:58	6:52
9	10.9	7:57	6:52
10	10.9	7:56	6:53
11	11.0	7:55	6:53
12	11.0	7:54	6:54
13	11.0	7:54	6:54
14	11.0	7:53	6:55
15	11.1	7:52	6:55
16	11.1	7:51	6:56
17	11.1	7:50	6:56
18	11.1	7:49	6:56
19	11.1	7:48	6:57
20	11.2	7:47	6:57
21	11.2	7:46	6:58
22	11.2	7:45	6:58
23	11.2	7:44	6:59
24	11.3	7:43	6:59
25	11.3	7:42	7:00
26	11.3	7:41	7:00
27	11.3	7:40	7:01
28	11.4	7:39	7:01
29	11.4	7:38	7:01
30	11.4	7:37	7:02
31	11.4	7:36	7:02

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.88 kWh/m².

For context, solar energy here swings from a low near 2.77 kWh/m² to a high of 5.66 kWh/m² in December across the year — August's 3.88 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	31
Solar energy (kWh/m²)	3.4	3.5	3.5	3.5	3.5	3.6	3.6	3.6	3.6	3.7	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	4.1	4.2	4.2	4.2	4.2	4.2	4.2
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.4	Moderate
2	3.5	Moderate
3	3.5	Moderate
4	3.5	Moderate
5	3.5	Moderate
6	3.6	Moderate
7	3.6	Moderate
8	3.6	Moderate
9	3.6	Moderate
10	3.7	Moderate
11	3.7	Moderate
12	3.7	Moderate
13	3.7	Moderate
14	3.8	Moderate
15	3.8	Moderate
16	3.8	Moderate
17	3.9	Moderate
18	3.9	Moderate
19	3.9	Moderate
20	4.0	Moderate
21	4.0	Moderate
22	4.0	Bright
23	4.1	Bright
24	4.1	Bright
25	4.1	Bright
26	4.2	Bright
27	4.2	Bright
28	4.2	Bright
29	4.2	Bright
30	4.2	Bright
31	4.2	Bright

Planning a trip in August

Is August a good time to visit Rio Negro?

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

7.0

Sightseeing

1st-best month of the year

4.3

Beach & pool

9th-best month of the year

August is one of the better times to visit Rio Negro for general sightseeing.

What to pack for Rio Negro in August

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

In August, Rio Negro sees daytime highs around 21°C and nights near 10°C. Little to plan around — just the basics. About 8 days see rain.

UV index in Rio Negro in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August 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 Negro peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).

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)	15	14	12	9	6	6	5	7	8	11	13	14
Level	Extreme	Extreme	Extreme	Very high	High	High	High	High	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	15	Extreme
Feb	14	Extreme
Mar	12	Extreme
Apr	9	Very high
May	6	High
Jun	6	High
Jul	5	High
Aug	7	High
Sep	8	Very high
Oct	11	Extreme
Nov	13	Extreme
Dec	14	Extreme

Air quality in Rio Negro in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Rio Negro is worst in September — around 16 µg/m³ PM2.5 (moderate), about 1.8× 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)	9	9	9	11	12	12	14	15	16	11	10	9
Level	Good	Good	Good	Good	Moderate	Good	Moderate	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	9	Good
Feb	9	Good
Mar	9	Good
Apr	11	Good
May	12	Moderate
Jun	12	Good
Jul	14	Moderate
Aug	15	Moderate
Sep	16	Moderate
Oct	11	Good
Nov	10	Good
Dec	9	Good

Location & terrain

Where is Rio Negro?

Rio Negro sits at 26.1°S, 49.8°W, 795 m above sea level, in Brazil. The nearest listed city is Mafra, 1.0 km away.

Topography around Rio Negro

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

Within 3 km, the terrain around Rio Negro has only modest variations in elevation — a maximum elevation change of 110 m around an average of 800 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 196 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,275 m.

The land around Rio Negro is covered by trees (43%) and artificial surfaces (38%) within 3 km, trees (58%) and cropland (30%) within 16 km, and trees (68%) and cropland (23%) within 80 km.

3 km

110 m

trees 43%

16 km

196 m

trees 58%

80 km

1,275 m

trees 68%

treesgrasslandcroplandartificial surfaceswater

← July Rio Negro year-round climate September →Best places to visit in August

August weather nearby: Mafra 1.0 km · Itaiópolis 28 km · Rio Negrinho 32 km · Lapa 38 km · Quitandinha 40 km · São Bento do Sul 45 km · Papanduva 45 km · Três Barras 52 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 Negro (-26.1058°, -49.7975°, elevation 795 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	10
2	20	10
3	20	10
4	20	10
5	20	10
6	20	10
7	21	10
8	21	10
9	21	10
10	21	10
11	21	10
12	21	10
13	21	10
14	21	10
15	21	10
16	21	10
17	21	10
18	21	10
19	21	10
20	21	11
21	22	11
22	22	11
23	22	11
24	22	11
25	22	11
26	22	11
27	22	11
28	22	11
29	22	11
30	22	11
31	22	11

	Clearer (%)	Cloudier (%)
1	53	47
2	53	47
3	53	47
4	54	46
5	54	46
6	54	46
7	54	46
8	52	48
9	52	48
10	52	48
11	50	50
12	50	50
13	50	50
14	50	50
15	49	51
16	50	50
17	50	50
18	51	49
19	51	49
20	52	48
21	52	48
22	53	47
23	53	47
24	55	45
25	55	45
26	55	45
27	55	45
28	55	45
29	55	45
30	54	46
31	54	46

	Rain chance (%)
1	25
2	25
3	25
4	25
5	25
6	25
7	25
8	25
9	25
10	25
11	25
12	26
13	26
14	26
15	26
16	26
17	26
18	26
19	25
20	25
21	25
22	25
23	25
24	25
25	25
26	25
27	25
28	25
29	25
30	25
31	25

	Dry (%)	Comfortable (%)	Humid (%)
1	77	23	0
2	76	23	1
3	75	24	1
4	75	24	1
5	75	24	1
6	74	25	1
7	74	25	1
8	73	25	2
9	73	25	2
10	72	26	2
11	72	26	2
12	72	26	2
13	71	27	2
14	71	27	2
15	71	27	2
16	71	27	2
17	71	27	2
18	71	27	2
19	70	28	2
20	70	28	2
21	69	29	2
22	68	30	2
23	68	30	2
24	67	31	2
25	65	32	3
26	65	32	3
27	64	33	3
28	63	33	4
29	62	34	4
30	61	35	4
31	60	35	5

	Avg high (°C)	Avg low (°C)
1	20	10
2	20	10
3	20	10
4	20	10
5	20	10
6	20	10
7	21	10
8	21	10
9	21	10
10	21	10
11	21	10
12	21	10
13	21	10
14	21	10
15	21	10
16	21	10
17	21	10
18	21	10
19	21	10
20	21	11
21	22	11
22	22	11
23	22	11
24	22	11
25	22	11
26	22	11
27	22	11
28	22	11
29	22	11
30	22	11
31	22	11

	Clearer (%)	Cloudier (%)
1	53	47
2	53	47
3	53	47
4	54	46
5	54	46
6	54	46
7	54	46
8	52	48
9	52	48
10	52	48
11	50	50
12	50	50
13	50	50
14	50	50
15	49	51
16	50	50
17	50	50
18	51	49
19	51	49
20	52	48
21	52	48
22	53	47
23	53	47
24	55	45
25	55	45
26	55	45
27	55	45
28	55	45
29	55	45
30	54	46
31	54	46

	Rain chance (%)
1	25
2	25
3	25
4	25
5	25
6	25
7	25
8	25
9	25
10	25
11	25
12	26
13	26
14	26
15	26
16	26
17	26
18	26
19	25
20	25
21	25
22	25
23	25
24	25
25	25
26	25
27	25
28	25
29	25
30	25
31	25

	Dry (%)	Comfortable (%)	Humid (%)
1	77	23	0
2	76	23	1
3	75	24	1
4	75	24	1
5	75	24	1
6	74	25	1
7	74	25	1
8	73	25	2
9	73	25	2
10	72	26	2
11	72	26	2
12	72	26	2
13	71	27	2
14	71	27	2
15	71	27	2
16	71	27	2
17	71	27	2
18	71	27	2
19	70	28	2
20	70	28	2
21	69	29	2
22	68	30	2
23	68	30	2
24	67	31	2
25	65	32	3
26	65	32	3
27	64	33	3
28	63	33	4
29	62	34	4
30	61	35	4
31	60	35	5

	Avg high (°C)	Avg low (°C)
1	20	10
2	20	10
3	20	10
4	20	10
5	20	10
6	20	10
7	21	10
8	21	10
9	21	10
10	21	10
11	21	10
12	21	10
13	21	10
14	21	10
15	21	10
16	21	10
17	21	10
18	21	10
19	21	10
20	21	11
21	22	11
22	22	11
23	22	11
24	22	11
25	22	11
26	22	11
27	22	11
28	22	11
29	22	11
30	22	11
31	22	11

	Clearer (%)	Cloudier (%)
1	53	47
2	53	47
3	53	47
4	54	46
5	54	46
6	54	46
7	54	46
8	52	48
9	52	48
10	52	48
11	50	50
12	50	50
13	50	50
14	50	50
15	49	51
16	50	50
17	50	50
18	51	49
19	51	49
20	52	48
21	52	48
22	53	47
23	53	47
24	55	45
25	55	45
26	55	45
27	55	45
28	55	45
29	55	45
30	54	46
31	54	46

	Rain chance (%)
1	25
2	25
3	25
4	25
5	25
6	25
7	25
8	25
9	25
10	25
11	25
12	26
13	26
14	26
15	26
16	26
17	26
18	26
19	25
20	25
21	25
22	25
23	25
24	25
25	25
26	25
27	25
28	25
29	25
30	25
31	25

	Dry (%)	Comfortable (%)	Humid (%)
1	77	23	0
2	76	23	1
3	75	24	1
4	75	24	1
5	75	24	1
6	74	25	1
7	74	25	1
8	73	25	2
9	73	25	2
10	72	26	2
11	72	26	2
12	72	26	2
13	71	27	2
14	71	27	2
15	71	27	2
16	71	27	2
17	71	27	2
18	71	27	2
19	70	28	2
20	70	28	2
21	69	29	2
22	68	30	2
23	68	30	2
24	67	31	2
25	65	32	3
26	65	32	3
27	64	33	3
28	63	33	4
29	62	34	4
30	61	35	4
31	60	35	5