Fortuna weather in May

In May, Fortuna sees average daytime highs of 31°C and overnight lows near 22°C, with 73 mm of rain across 11.5 wet days and about 11.7 hours of daylight. It is the 8th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 24% of the time in May, and the air most often feels oppressive.

Daylight stretches from about 11 h 48 min at the start of May to 11 h 42 min by month's end. Set against the rest of the year, May is Fortuna's 6th-clearest and 6th-windiest month. For the whole year in context, see Fortuna's year-round climate.

Daytime high
31°
8th warmest
Overnight low
22°
8th coldest
Rainfall
73 mm
11.5 wet days
Daylight
11 h 42 min
6:01 AM – 5:45 PM
Cloud cover
61%
6th clearest
Wind
7 km/h
6th windiest
Solar energy
4.79 kWh/m²
Travel score
4.2
out of 10

Fortuna 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 31°C through the month.

A typical May day in Fortuna reaches about 31°C in the afternoon and slips back to 22°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, May runs on par with April and about 1°C cooler than June.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13122
23122
33122
43122
53122
63122
73122
83122
93122
103122
113122
123122
133122
143122
153122
163122
173122
183122
193122
203122
213122
223122
233122
243122
253122
263122
273122
283222
293222
303222
313222

How May really feels in Fortuna

Once humidity and wind are folded in, May averages 31 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
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Fortuna weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 22°2342612.32.9
Feb30° / 22°22024.312.22.9
Mar30° / 22°24827.6122.8
Apr31° / 22°17321.911.93.3
May31° / 22°7311.511.74.2
Jun32° / 22°8211.74.8
Jul33° / 22°70.711.74.7
Aug34° / 22°10.211.84.0
Sep35° / 23°131.7123.2
Oct35° / 23°304.612.13.1
Nov33° / 23°9111.912.33.2
Dec32° / 23°13717.612.33.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 26% of May, with mostly cloudy or overcast conditions the remaining 49%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13268
23466
33466
43664
53763
63862
74060
84159
94357
104456
114555
124852
134951
145050
155149
165248
175248
185446
195446
205644
215743
225743
235941
246040
256139
266238
276337
286436
296535
306634
316832

Chance of precipitation in May

Any precipitation

Fortuna gets around 73 mm of rain over 11.5 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 37% and peaks near 55% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
155
254
352
451
549
648
746
844
942
1041
1139
1238
1337
1436
1536
1635
1735
1834
1934
2033
2132
2232
2331
2430
2529
2628
2726
2825
2923
3022
3120

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the oppressive band about 74% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1048214
2048313
3058213
4068212
5068212
6078211
7088111
8098110
90108010
100117910
110127810
120127810
130137710
140137710
15014779
16015769
17015769
18016759
19017758
20118738
21119728
22120727
23121717
24123706
25225676
26226675
27228655
28331624
29433594
30435583
31538543

Wind in May

Winds average 7 km/h in May.

Across May, daily wind ranges from about 6 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
318calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 11 h 48 min at the start of May to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over May. Sunrise moves from 6:00 AM to 6:03 AM, and sunset from 5:48 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.86:005:48
211.86:005:48
311.86:005:47
411.86:005:47
511.86:005:47
611.86:005:47
711.86:005:46
811.86:005:46
911.86:005:46
1011.86:005:46
1111.86:005:46
1211.86:005:46
1311.86:005:45
1411.76:005:45
1511.76:015:45
1611.76:015:45
1711.76:015:45
1811.76:015:45
1911.76:015:45
2011.76:015:45
2111.76:015:45
2211.76:025:45
2311.76:025:45
2411.76:025:45
2511.76:025:45
2611.76:025:45
2711.76:025:45
2811.76:035:45
2911.76:035:45
3011.76:035:45
3111.76:035:45

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 4.79 kWh/m².

For context, solar energy here swings from a low near 4.46 kWh/m² to a high of 6.43 kWh/m² in September across the year — May's 4.79 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.7Bright
54.7Bright
64.7Bright
74.7Bright
84.7Bright
94.7Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.8Bright
154.8Bright
164.8Bright
174.8Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
305.0Bright
315.0Bright
Planning a trip in May

Hazard calendar for Fortuna

In seasonPeak

None of Fortuna's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Fortuna's monsoon runs December–April, when most of the year's rain falls.

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

Is May a good time to visit Fortuna?

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

4.2
Sightseeing
3rd-best month of the year
6.4
Beach & pool
6th-best month of the year

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

What to pack for Fortuna in May

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

In May, Fortuna sees daytime highs around 31°C and nights near 22°C. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Fortuna in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fortuna peaks around March 11 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 10 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 11UV 15Aug 10UV 10
UV index (midday)Level
Jan13Extreme
Feb15Extreme
Mar15Extreme
Apr14Extreme
May11Extreme
Jun10Very high
Jul10Very high
Aug10Very high
Sep12Extreme
Oct12Extreme
Nov11Extreme
Dec11Extreme

Air quality in Fortuna 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 Fortuna is worst in October — around 53 µg/m³ PM2.5 (poor), about 8.4× the cleanest month (June, 6 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModeratePoorModerateOct 953 µg/m³Jun 167 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar12Good
Apr11Good
May8Good
Jun6Good
Jul8Good
Aug25Moderate
Sep53Poor
Oct53Poor
Nov23Moderate
Dec17Moderate
Location & terrain

Where is Fortuna?

Fortuna sits at 5.7°S, 44.2°W, 210 m above sea level, in Brazil. The nearest listed city is São Domingos do Maranhão, 31 km away.

Topography around Fortuna

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

Within 3 km, the terrain around Fortuna has only modest variations in elevation — a maximum elevation change of 108 m around an average of 211 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 278 m; within 80 km, significant variations in elevation — a maximum elevation change of 410 m.

The land around Fortuna is covered by grassland (56%) and trees (35%) within 3 km, trees (59%) and grassland (32%) within 16 km, and trees (68%) and grassland (27%) within 80 km.

3 km
108 m
16 km
278 m
80 km
410 m
treesshrubsgrasslandcroplandartificial surfaces
May weather nearby: São Domingos do Maranhão 31 km · Colinas 34 km · Buriti Bravo 38 km · Presidente Dutra 61 km · Passagem Franca 65 km · Mirador 74 km · Tuntum 76 km · São João do Soter 79 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 Fortuna (-5.7333°, -44.1583°, elevation 210 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).