São Borja weather in May

In May, São Borja sees average daytime highs of 23°C and overnight lows near 14°C, with 119 mm of rain across 8.3 wet days and about 10.6 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 24°C in the first days to 21°C by the end. The sky is clear or mostly clear about 39% of the time in May, and the air most often feels dry.

Daylight stretches from about 10 h 54 min at the start of May to 10 h 18 min by month's end. Set against the rest of the year, May is São Borja's 10th-clearest and 8th-windiest month. For the whole year in context, see São Borja's year-round climate.

Daytime high
23°
9th warmest
Overnight low
14°
4th coldest
Rainfall
119 mm
8.3 wet days
Daylight
10 h 36 min
8:23 AM – 6:58 PM
Cloud cover
55%
10th clearest
Wind
12 km/h
8th windiest
Solar energy
3 kWh/m²
Travel score
7.1
out of 10

São Borja is human settlement in Brazil.

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 24°C in the first days to 21°C by the end.

A typical May day in São Borja reaches about 23°C in the afternoon and slips back to 14°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 28°C. Set against its neighbours, May runs about 4°C cooler than April and about 2°C warmer than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12515
22415
32415
42415
52415
62415
72414
82414
92414
102314
112314
122314
132314
142314
152314
162314
172313
182213
192213
202213
212213
222213
232213
242213
252113
262113
272112
282112
292112
302112
312112

How May really feels in São Borja

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

São Borja weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan32° / 22°15911.913.63.9
Feb31° / 21°13211.2134.3
Mar30° / 20°12810.212.25.2
Apr27° / 17°16510.111.36.7
May23° / 14°1198.310.67.1
Jun21° / 12°1179.210.26.5
Jul20° / 11°1138.810.46.7
Aug23° / 12°1038.5117.2
Sep24° / 14°15110.111.87.0
Oct27° / 16°21011.512.76.4
Nov29° / 18°155913.45.7
Dec31° / 20°15710.613.84.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 12% of May, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25446
35446
45446
55446
65347
75347
85347
95347
105347
115347
125347
135248
145149
155149
165149
175149
185050
194951
205050
215050
224951
234852
244852
254852
264852
274852
284852
294852
304852
314951

Chance of precipitation in May

Any precipitation

São Borja gets around 119 mm of rain over 8.3 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 27% and peaks near 28% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
128
227
327
426
526
626
726
826
925
1025
1126
1226
1326
1426
1527
1627
1727
1827
1928
2028
2128
2228
2328
2428
2528
2628
2728
2828
2928
3028
3128

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 42% of days. Sticky, muggy-or-worse air turns up on roughly 15% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1312222223
2322221223
3332221222
4342320222
5342320211
6352420211
7352420201
8362519191
9362519190
10372619180
11372619170
12382719160
13382719160
14392719150
15392719150
16402719140
17402719130
18412619130
19422619120
20432619110
21442519101
22462519101
2347241991
2448241891
2549231881
2650231881
2752221781
2852221781
2953221771
3053221771
3155211671

Wind in May

Winds average 12 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 10 h 54 min at the start of May to 10 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over May. Sunrise moves from 8:14 AM to 8:32 AM, and sunset from 7:09 PM to 6:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.98:147:09
210.98:147:08
310.98:157:07
410.88:167:06
510.88:167:05
610.88:177:05
710.88:177:04
810.78:187:03
910.78:197:02
1010.78:197:01
1110.78:207:01
1210.78:217:00
1310.68:216:59
1410.68:226:59
1510.68:226:58
1610.68:236:58
1710.68:246:57
1810.58:246:56
1910.58:256:56
2010.58:256:55
2110.58:266:55
2210.58:276:54
2310.48:276:54
2410.48:286:54
2510.48:286:53
2610.48:296:53
2710.48:296:52
2810.48:306:52
2910.48:316:52
3010.38:316:51
3110.38:326:51

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3 kWh/m².

For context, solar energy here swings from a low near 2.53 kWh/m² to a high of 6.86 kWh/m² in December across the year — May's 3 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.5Moderate
23.4Moderate
33.4Moderate
43.4Moderate
53.3Moderate
63.3Moderate
73.3Moderate
83.2Moderate
93.2Moderate
103.2Moderate
113.1Moderate
123.1Moderate
133.1Moderate
143.0Moderate
153.0Moderate
163.0Moderate
173.0Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.8Moderate
252.8Moderate
262.8Moderate
272.7Moderate
282.7Moderate
292.7Moderate
302.7Moderate
312.7Moderate
Planning a trip in May

Is May a good time to visit São Borja?

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

7.1
Sightseeing
2nd-best month of the year
5.3
Beach & pool
9th-best month of the year

May is one of the better times to visit São Borja for general sightseeing.

What to pack for São Borja in May

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

In May, São Borja sees daytime highs around 23°C and nights near 14°C. Worth packing: light clothes and rain gear. About 8 days see rain.

light clothesrain gear

UV index in São Borja in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in São Borja peaks around January 21 at about 14 (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 highModerateHighExtremeJan 21UV 14Jun 19UV 3
UV index (midday)Level
Jan14Extreme
Feb13Extreme
Mar11Extreme
Apr8Very high
May5Moderate
Jun3Moderate
Jul4Moderate
Aug5Moderate
Sep8Very high
Oct5High
Nov11Extreme
Dec12Extreme

Air quality in São Borja in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in São Borja is worst in September — around 16 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (March, 6 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodGoodModerateGoodSep 1116 µg/m³Mar 226 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb14Moderate
Mar6Good
Apr7Good
May6Good
Jun7Good
Jul10Good
Aug15Moderate
Sep16Moderate
Oct9Good
Nov9Good
Dec6Good
Location & terrain

Where is São Borja?

São Borja sits at 28.7°S, 56.0°W, 98 m above sea level, in Brazil. The nearest listed city is Santo Tomé, 13 km away.

Topography around São Borja

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

Within 3 km, the terrain around São Borja has only modest variations in elevation — a maximum elevation change of 43 m around an average of 79 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 80 m; within 80 km, significant variations in elevation — a maximum elevation change of 276 m.

The land around São Borja is covered by artificial surfaces (26%) and cropland (24%) within 3 km, cropland (47%) within 16 km, and grassland (39%) and cropland (25%) within 80 km.

3 km
43 m
16 km
80 m
80 km
276 m
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Santo Tomé 13 km · Gobernador Virasora 68 km · Itaqui 74 km · Apóstoles 87 km · São Luiz Gonzaga 106 km · Santiago 125 km · Alegrete 127 km · São Francisco de Assis 130 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 São Borja (-28.6606°, -56.0044°, elevation 98 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).