Santa Helena weather in May

In May, Santa Helena sees average daytime highs of 24°C and overnight lows near 16°C, with 139 mm of rain across 9.1 wet days and about 10.8 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 26°C in the first days to 23°C by the end. The sky is clear or mostly clear about 40% of the time in May, and the air most often feels humid.

Daylight stretches from about 11 h 06 min at the start of May to 10 h 36 min by month's end. Set against the rest of the year, May is Santa Helena's 7th-clearest and 6th-windiest month. For the whole year in context, see Santa Helena's year-round climate.

Daytime high
24°
10th warmest
Overnight low
16°
4th coldest
Rainfall
139 mm
9.1 wet days
Daylight
10 h 48 min
8:10 AM – 6:57 PM
Cloud cover
54%
7th clearest
Wind
10 km/h
6th windiest
Solar energy
3.37 kWh/m²
Travel score
7.1
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 26°C in the first days to 23°C by the end.

A typical May day in Santa Helena reaches about 24°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 29°C. Set against its neighbours, May runs about 4°C cooler than April and about 1°C warmer than June.

10°15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
12618
22618
32618
42617
52517
62517
72517
82517
92517
102517
112517
122417
132416
142416
152416
162416
172416
182416
192416
202416
212316
222316
232316
242316
252315
262315
272315
282315
292315
302315
312315

How May really feels in Santa Helena

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.

Santa Helena weather by month

How May compares with the rest of the year at a glance. May is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°12815.213.43.9
Feb31° / 23°12513.812.94.0
Mar30° / 22°1011212.24.7
Apr28° / 19°1068.411.46.3
May24° / 16°1399.110.87.1
Jun23° / 15°1148.810.57.1
Jul23° / 14°997.910.67.4
Aug25° / 15°856.511.17.7
Sep27° / 17°1339.211.86.8
Oct29° / 20°16212.612.65.3
Nov30° / 21°13311.613.24.9
Dec31° / 22°15414.413.54.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% of May, with mostly cloudy or overcast conditions the remaining 48%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25545
35545
45545
55545
65446
75545
85446
95446
105446
115446
125347
135347
145347
155248
165248
175248
185248
195149
205149
215149
225149
235050
245050
255050
265050
275050
285050
295050
305050
315149

Chance of precipitation in May

Any precipitation

Santa Helena gets around 139 mm of rain over 9.1 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 29% and peaks near 33% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
125
225
325
425
524
625
725
825
925
1026
1126
1226
1327
1427
1528
1629
1729
1830
1931
2031
2132
2232
2333
2433
2533
2633
2733
2832
2932
3032
3131

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the humid band about 35% of days. Sticky, muggy-or-worse air turns up on roughly 21% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1121438324
2131538314
3141638293
4151738283
5151838273
6161937262
7162037252
8162136242
9172236231
10172336221
11182436211
12182536211
13182536201
14182636191
15192636181
16192736171
17192736171
18202835161
19202835151
20212835151
21222934141
22232934141
23242933141
24242932131
25252932131
26262931131
27272930131
28282830131
29292829131
30292829131
31302829131

Wind in May

Winds average 10 km/h in May.

Across May, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 06 min at the start of May to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over May. Sunrise moves from 8:02 AM to 8:17 AM, and sunset from 7:07 PM to 6:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.18:027:07
211.18:037:06
311.08:037:05
411.08:047:05
511.08:047:04
611.08:057:03
711.08:057:03
810.98:067:02
910.98:067:01
1010.98:077:01
1110.98:077:00
1210.98:087:00
1310.88:086:59
1410.88:096:58
1510.88:096:58
1610.88:106:57
1710.88:106:57
1810.88:116:56
1910.78:116:56
2010.78:126:56
2110.78:126:55
2210.78:136:55
2310.78:136:54
2410.78:146:54
2510.78:146:54
2610.68:156:53
2710.68:156:53
2810.68:166:53
2910.68:166:53
3010.68:176:52
3110.68:176:52

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 3.37 kWh/m².

For context, solar energy here swings from a low near 2.97 kWh/m² to a high of 6.39 kWh/m² in December across the year — May's 3.37 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.7Moderate
73.7Moderate
83.7Moderate
93.6Moderate
103.6Moderate
113.6Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.4Moderate
163.4Moderate
173.3Moderate
183.3Moderate
193.3Moderate
203.2Moderate
213.2Moderate
223.2Moderate
233.1Moderate
243.1Moderate
253.1Moderate
263.1Moderate
273.0Moderate
283.0Moderate
293.0Moderate
303.0Moderate
313.0Moderate
Planning a trip in May

Is May a good time to visit Santa Helena?

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

7.1
Sightseeing
3rd-best month of the year
6.1
Beach & pool
8th-best month of the year

May is one of the better times to visit Santa Helena for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Santa Helena in May

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

In May, Santa Helena sees daytime highs around 24°C and nights near 16°C. Worth packing: light clothes and rain gear. About 9 days see rain.

light clothesrain gear

UV index in Santa Helena in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santa Helena peaks around January 19 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 5 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighExtremeJan 19UV 15Jul 11UV 5
UV index (midday)Level
Jan15Extreme
Feb14Extreme
Mar12Extreme
Apr9Very high
May6High
Jun5High
Jul5Moderate
Aug7High
Sep6High
Oct10Very high
Nov12Extreme
Dec13Extreme

Air quality in Santa Helena 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 Santa Helena is worst in September — around 21 µg/m³ PM2.5 (moderate), about 3.6× the cleanest month (March, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1620 µg/m³Mar 156 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb6Good
Mar6Good
Apr7Good
May7Good
Jun8Good
Jul7Good
Aug12Moderate
Sep21Moderate
Oct12Good
Nov8Good
Dec7Good
Location & terrain

Where is Santa Helena?

Santa Helena sits at 24.9°S, 54.3°W, 254 m above sea level, in Brazil. The nearest listed city is Marechal Cândido Rondon, 44 km away.

Topography around Santa Helena

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

Within 3 km, the terrain around Santa Helena has only modest variations in elevation — a maximum elevation change of 72 m around an average of 238 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 259 m; within 80 km, large variations in elevation — a maximum elevation change of 674 m.

The land around Santa Helena is covered by cropland (31%), trees (30%) and water (20%) within 3 km, trees (33%), cropland (31%) and water (28%) within 16 km, and cropland (57%) and trees (28%) within 80 km.

3 km
72 m
16 km
259 m
80 km
674 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Marechal Cândido Rondon 44 km · Medianeira 54 km · Matelândia 55 km · São Miguel do Iguaçu 55 km · Toledo 62 km · Santa Terezinha de Itaipu 65 km · Ciudad del Este 78 km · Foz do Iguacu 81 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 Santa Helena (-24.8603°, -54.3328°, elevation 254 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).