São Mateus weather in May

In May, São Mateus sees average daytime highs of 26°C and overnight lows near 22°C, with 70 mm of rain across 13.2 wet days and about 11.1 hours of daylight. It is the 7th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 46% of the time in May, and the air most often feels muggy.

Daylight stretches from about 11 h 18 min at the start of May to 11 hours by month's end. Set against the rest of the year, May is São Mateus's 5th-clearest and 8th-windiest month. For the whole year in context, see São Mateus's year-round climate.

Daytime high
26°
7th warmest
Overnight low
22°
5th coldest
Rainfall
70 mm
13.2 wet days
Daylight
11 h 06 min
7:02 AM – 6:09 PM
Cloud cover
48%
5th clearest
Wind
15 km/h
8th windiest
Solar energy
4.2 kWh/m²
Travel score
6.4
out of 10

São Mateus 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

Day-to-day highs hold fairly steady near 26°C through the month.

A typical May day in São Mateus reaches about 26°C in the afternoon and slips back to 22°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 27°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12723
22723
32723
42623
52623
62623
72623
82623
92623
102623
112623
122623
132623
142622
152622
162622
172622
182622
192622
202622
212622
222622
232622
242622
252622
262622
272622
282622
292622
302522
312522

São Mateus weather by month

How May compares with the rest of the year at a glance. May is the 7th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 24°10613.4135.9
Feb28° / 24°7613.912.65.4
Mar28° / 24°13618.212.15.2
Apr27° / 24°10816.911.65.6
May26° / 22°7013.211.16.4
Jun25° / 21°5211.810.96.8
Jul24° / 21°5713.2116.8
Aug24° / 21°4811.211.47.1
Sep25° / 22°5410.811.96.9
Oct26° / 23°9613.412.46.2
Nov26° / 23°18317.612.95.3
Dec27° / 24°14715.513.15.5

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 21% of May, with mostly cloudy or overcast conditions the remaining 33%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17129
27129
37129
47030
57030
66931
76832
86733
96733
106634
116535
126436
136337
146337
156436
166337
176337
186337
196337
206337
216337
226436
236436
246535
256634
266733
276931
286931
297030
307129
317228

Chance of precipitation in May

Any precipitation

São Mateus gets around 70 mm of rain over 13.2 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 43% and peaks near 51% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
151
250
349
447
546
645
744
844
943
1043
1142
1242
1342
1442
1542
1642
1742
1842
1942
2042
2142
2242
2342
2442
2541
2641
2740
2839
2939
3038
3138

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the muggy band about 46% of days. Sticky, muggy-or-worse air turns up on roughly 87% of them.

0%25%50%75%100%151015202531
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
11538551
21639531
31641511
41742491
51843480
61844460
71945450
81945440
911045440
1011046430
1111146430
1211146420
1311246410
1411246410
1511246410
1611346400
1711346400
1811346400
1911346400
2011346400
2111347390
2211347390
2311447380
2411448380
2511448370
2611549360
2711549350
2811549340
2921650330
3021650320
3121651310

Wind in May

Winds average 15 km/h in May.

Across May, daily wind ranges from about 15 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light breeze
3015light breeze
3115light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 18 min at the start of May to 11 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over May. Sunrise moves from 6:57 AM to 7:08 AM, and sunset from 6:17 PM to 6:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.36:576:17
211.36:576:16
311.36:576:15
411.36:586:15
511.36:586:14
611.36:586:14
711.26:596:13
811.26:596:13
911.26:596:12
1011.27:006:12
1111.27:006:11
1211.27:016:11
1311.27:016:10
1411.17:016:10
1511.17:026:10
1611.17:026:09
1711.17:026:09
1811.17:036:09
1911.17:036:08
2011.17:046:08
2111.17:046:08
2211.17:046:07
2311.07:056:07
2411.07:056:07
2511.07:066:07
2611.07:066:07
2711.07:066:06
2811.07:076:06
2911.07:076:06
3011.07:076:06
3111.07:086:06

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.2 kWh/m².

For context, solar energy here swings from a low near 3.83 kWh/m² to a high of 6.76 kWh/m² in January across the year — May's 4.2 kWh/m² sits near the bottom.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.4Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.1Bright
204.1Bright
214.0Bright
224.0Bright
234.0Bright
244.0Moderate
254.0Moderate
264.0Moderate
274.0Moderate
284.0Moderate
293.9Moderate
303.9Moderate
313.9Moderate
Planning a trip in May

Is May a good time to visit São Mateus?

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

6.4
Sightseeing
5th-best month of the year
6.1
Beach & pool
6th-best month of the year

May is a reasonable time to visit São Mateus for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for São Mateus in May

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

In May, São Mateus sees daytime highs around 26°C and nights near 22°C. Worth packing: light clothes and rain gear. About 13 days see rain.

light clothesrain gear

Sea temperature near São Mateus in May

The nearest coast averages about 26°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 27 km away) is warmest in March at about 28°C and coldest in August near 24°C.

The water stays above 20°C all year — warm enough for a swim any month.

22°24°26°28°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb27Warm
Mar28Warm
Apr27Warm
May26Warm
Jun25Warm
Jul24Warm
Aug24Warm
Sep25Warm
Oct25Warm
Nov26Warm
Dec26Warm

UV index in São Mateus in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 — 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 Mateus peaks around February 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighVery highExtremeFeb 13UV 14Jun 20UV 7
UV index (midday)Level
Jan14Extreme
Feb15Extreme
Mar13Extreme
Apr10Extreme
May8Very high
Jun7High
Jul7High
Aug9Very high
Sep10Extreme
Oct12Extreme
Nov14Extreme
Dec13Extreme
Location & terrain

Where is São Mateus?

São Mateus sits at 18.7°S, 39.9°W, 38 m above sea level, in Brazil. The nearest listed city is Conceição da Barra, 19 km away.

Topography around São Mateus

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

Within 3 km, the terrain around São Mateus has only modest variations in elevation — a maximum elevation change of 51 m around an average of 22 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 95 m; within 80 km, large variations in elevation — a maximum elevation change of 744 m.

The land around São Mateus is covered by trees (34%), artificial surfaces (26%) and grassland (21%) within 3 km, trees (55%) and grassland (26%) within 16 km, and grassland (37%), trees (33%) and water (27%) within 80 km.

3 km
51 m
16 km
95 m
80 km
744 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
May weather nearby: Conceição da Barra 19 km · Jaguaré 31 km · Pinheiros 54 km · Nova Venécia 57 km · Sooretama 59 km · Mucuri 78 km · Linhares 78 km · Rio Bananal 78 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 Mateus (-18.7201°, -39.8589°, elevation 38 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).