Rio Grande weather in May

In May, Rio Grande sees average daytime highs of 19°C and overnight lows near 16°C, with 104 mm of rain across 9.7 wet days and about 10.4 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 17°C by the end. The sky is clear or mostly clear about 35% of the time in May, and the air most often feels dry.

Daylight stretches from about 10 h 48 min at the start of May to 10 h 06 min by month's end. Set against the rest of the year, May is Rio Grande's 8th-clearest and 11th-windiest month. For the whole year in context, see Rio Grande's year-round climate.

Daytime high
19°
7th warmest
Overnight low
16°
5th coldest
Rainfall
104 mm
9.7 wet days
Daylight
10 h 24 min
8:14 AM – 6:36 PM
Cloud cover
58%
8th clearest
Wind
21 km/h
11th windiest
Solar energy
2.82 kWh/m²
Travel score
6.1
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.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 20°C in the first days to 17°C by the end.

A typical May day in Rio Grande reaches about 19°C in the afternoon and slips back to 16°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 21°C. Set against its neighbours, May runs about 3°C cooler than April and about 3°C warmer than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12018
22018
32018
42018
52017
61917
71917
81917
91917
101917
111917
121917
131917
141917
151917
161917
171816
181816
191816
201816
211816
221816
231816
241816
251816
261816
271715
281715
291715
301715
311715

Rio Grande weather by month

How May compares with the rest of the year at a glance. May is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 22°878.613.97.4
Feb24° / 23°849.713.27.0
Mar24° / 22°921012.27.1
Apr21° / 19°11310.211.26.6
May19° / 16°1049.710.46.1
Jun16° / 14°1109.79.95.0
Jul15° / 12°11210.210.14.4
Aug15° / 13°1089.710.84.8
Sep16° / 14°12510.411.85.1
Oct18° / 17°12910.212.86.0
Nov21° / 19°877.713.66.8
Dec23° / 21°867.814.17.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25248
35248
45248
55248
65248
75248
85248
95248
105248
115347
125347
135347
145347
155248
165248
175248
185149
195050
205050
214852
224852
234852
244753
254753
264654
274555
284555
294555
304555
314456

Chance of precipitation in May

Any precipitation

Rio Grande gets around 104 mm of rain over 9.7 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 33% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
133
233
332
432
531
631
731
830
930
1030
1129
1229
1329
1429
1529
1629
1729
1830
1930
2030
2130
2230
2331
2431
2531
2631
2731
2831
2931
3031
3131

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 38% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1302328171
2302428161
3312528151
4312628151
5312628141
6312728130
7312828130
8312828120
9322928110
10322929100
11322929100
1232292990
1333292990
1433292990
1533292990
1634292980
1735292880
1835292870
1937292870
2038292770
2139282660
2241282660
2342272550
2444272450
2545272350
2647262240
2748262140
2851262030
2950272030
3052271920
3153271820

Wind in May

Winds average 21 km/h in May.

Across May, daily wind ranges from about 21 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
121breezy
221breezy
321breezy
421breezy
521breezy
621breezy
721breezy
821breezy
921breezy
1021breezy
1121breezy
1221breezy
1321breezy
1421breezy
1521breezy
1621breezy
1721breezy
1821breezy
1921breezy
2021breezy
2121breezy
2221breezy
2321breezy
2421breezy
2521breezy
2621breezy
2721breezy
2821breezy
2921breezy
3021breezy
3121breezy

Sunrise & sunset in May

DaylightNight

Daylight runs from about 10 h 48 min at the start of May to 10 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over May. Sunrise moves from 8:03 AM to 8:23 AM, and sunset from 6:48 PM to 6:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.88:036:48
210.78:046:47
310.78:046:46
410.78:056:45
510.68:066:45
610.68:066:44
710.68:076:43
810.68:086:42
910.58:096:41
1010.58:096:40
1110.58:106:39
1210.58:116:39
1310.48:116:38
1410.48:126:37
1510.48:136:36
1610.48:146:36
1710.38:146:35
1810.38:156:34
1910.38:166:34
2010.38:166:33
2110.38:176:33
2210.28:186:32
2310.28:186:31
2410.28:196:31
2510.28:206:30
2610.28:206:30
2710.18:216:30
2810.18:226:29
2910.18:226:29
3010.18:236:28
3110.18:236:28

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 2.82 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 — May's 2.82 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.2Moderate
23.2Moderate
33.2Moderate
43.1Moderate
53.1Moderate
63.1Moderate
73.1Moderate
83.0Moderate
93.0Moderate
103.0Moderate
113.0Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.8Moderate
172.8Moderate
182.8Moderate
192.8Moderate
202.7Moderate
212.7Moderate
222.7Moderate
232.7Moderate
242.6Moderate
252.6Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.5Moderate
312.5Moderate
Planning a trip in May

Is May a good time to visit Rio Grande?

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

6.1
Sightseeing
7th-best month of the year
2.3
Beach & pool
7th-best month of the year

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

What to pack for Rio Grande in May

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

In May, Rio Grande sees daytime highs around 19°C and nights near 16°C. Worth packing: rain gear and a windbreaker. About 10 days see rain.

rain geara windbreaker

Sea temperature near Rio Grande in May

The nearest coast averages about 19°C in May — 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.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan24Refreshing
Feb24Warm
Mar24Refreshing
Apr22Refreshing
May19Cool
Jun16Cool
Jul14Bracing
Aug14Bracing
Sep15Cool
Oct18Cool
Nov20Cool
Dec22Refreshing

UV index in Rio Grande in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 4 — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highModerateHighVery highExtremeJan 16UV 12Jun 19UV 3
UV index (midday)Level
Jan12Extreme
Feb12Extreme
Mar9Very high
Apr7High
May4Moderate
Jun3Moderate
Jul3Moderate
Aug5Moderate
Sep7High
Oct7Very high
Nov11Extreme
Dec12Extreme
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
16 km
33 m
80 km
357 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
May 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
Roman Catholic 57%Evangelical 27%none 9%other 4%

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).