São Tomé weather in August

In August, São Tomé sees average daytime highs of 24°C and overnight lows near 24°C, with 14 mm of rain across 2.6 wet days and about 12 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 12% of the time in August, and the air most often feels muggy.

Daylight stretches from about 12 hours at the start of August to 12 hours by month's end. Set against the rest of the year, August is São Tomé's 3rd-clearest and 2nd-windiest month. For the whole year in context, see São Tomé's year-round climate.

Daytime high
24°
11th warmest
Overnight low
24°
2nd coldest
Rainfall
14 mm
2.6 wet days
Daylight
12 hours
5:37 AM – 5:38 PM
Cloud cover
66%
3rd clearest
Wind
20 km/h
2nd windiest
Solar energy
5.28 kWh/m²
Travel score
7.9
out of 10

São Tomé is capital city of São Tomé and Príncipe.

Density
3,135/km²
people per km²
Founded
1485

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 24°C through the month.

A typical August day in São Tomé reaches about 24°C in the afternoon and slips back to 24°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 25°C. Set against its neighbours, August runs on par with July and on par with September.

20°23°25°28°30°151015202531
Avg high (°C)Avg low (°C)
12423
22423
32424
42424
52424
62424
72424
82424
92424
102424
112424
122424
132424
142424
152424
162424
172424
182424
192424
202424
212524
222524
232524
242524
252524
262524
272524
282524
292524
302524
312524

São Tomé weather by month

How August compares with the rest of the year at a glance. August is the 11th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 26°13523.6124.3
Feb28° / 26°11319.3124.6
Mar28° / 26°13320.5124.4
Apr28° / 26°13018.7124.8
May27° / 26°11917125.3
Jun25° / 24°234127.5
Jul24° / 24°82128.0
Aug24° / 24°142.6127.9
Sep25° / 24°467.8126.9
Oct26° / 25°15221.5124.9
Nov26° / 25°21025.7124.1
Dec27° / 25°17426.1124.1

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 29% of August, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24555
34555
44654
54654
64555
74555
84555
94456
104456
114357
124357
134159
144159
154060
163961
173961
183862
193763
203763
213763
223763
233763
243664
253763
263763
273862
283862
293862
303961
313961

Chance of precipitation in August

Any precipitation

São Tomé gets around 14 mm of rain over 2.6 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 8% and peaks near 12% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
14
24
34
45
55
65
75
85
96
106
116
127
137
147
158
168
178
189
199
2010
2110
2210
2311
2411
2511
2612
2712
2812
2912
3012
3112

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the muggy band about 57% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)Oppressive (%)
117326
217326
317227
417128
517029
616930
716831
816633
916534
1016435
1116336
1216138
1316039
1415940
1515841
1615742
1715643
1815544
1915544
2015445
2115247
2205248
2305149
2404951
2504753
2604555
2704357
2804159
2903961
3003664
3103466

Wind in August

Winds average 20 km/h in August.

Across August, daily wind ranges from about 20 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
120breezy
220breezy
320breezy
420breezy
520breezy
620breezy
720breezy
820breezy
920breezy
1020breezy
1120breezy
1220breezy
1320breezy
1420breezy
1520breezy
1620breezy
1720breezy
1820breezy
1920breezy
2020breezy
2120breezy
2220breezy
2320breezy
2420breezy
2520breezy
2620breezy
2720breezy
2820breezy
2920breezy
3020breezy
3120breezy

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 hours at the start of August to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over August. Sunrise moves from 5:39 AM to 5:33 AM, and sunset from 5:40 PM to 5:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.05:395:40
212.05:395:40
312.05:395:39
412.05:395:39
512.05:385:39
612.05:385:39
712.05:385:39
812.05:385:39
912.05:385:39
1012.05:385:39
1112.05:385:38
1212.05:385:38
1312.05:375:38
1412.05:375:38
1512.05:375:38
1612.05:375:38
1712.05:375:37
1812.05:365:37
1912.05:365:37
2012.05:365:37
2112.05:365:36
2212.05:355:36
2312.05:355:36
2412.05:355:35
2512.05:355:35
2612.05:345:35
2712.05:345:35
2812.05:345:34
2912.05:345:34
3012.05:335:34
3112.05:335:33

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5.28 kWh/m².

For context, solar energy here swings from a low near 4.89 kWh/m² to a high of 5.48 kWh/m² in March across the year — August's 5.28 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.2Bright
85.2Bright
95.3Bright
105.3Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.4Bright
295.4Bright
305.4Bright
315.4Bright
Planning a trip in August

Hazard calendar for São Tomé

In seasonPeak

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

São Tomé's rainy season runs October–May, when most of the year's rain falls.

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

Is August a good time to visit São Tomé?

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

7.9
Sightseeing
2nd-best month of the year
6.9
Beach & pool
2nd-best month of the year

August is one of the better times to visit São Tomé for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for São Tomé in August

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

In August, São Tomé sees daytime highs around 24°C and nights near 24°C. Worth packing: light clothes, sun protection and a windbreaker.

light clothessun protectiona windbreaker

Sea temperature near São Tomé in August

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

The sea offshore is warmest in March at about 29°C and coldest in August near 26°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb29Tropical
Mar29Tropical
Apr29Tropical
May28Tropical
Jun27Warm
Jul26Warm
Aug26Warm
Sep26Warm
Oct27Warm
Nov28Warm
Dec28Tropical

UV index in São Tomé in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in São Tomé peaks around March 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near August 12 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highExtremeMar 21UV 14Aug 12UV 9
UV index (midday)Level
Jan11Extreme
Feb12Extreme
Mar14Extreme
Apr13Extreme
May11Extreme
Jun9Very high
Jul9Very high
Aug8Very high
Sep12Extreme
Oct13Extreme
Nov12Extreme
Dec11Extreme

Air quality in São Tomé in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in São Tomé is worst in February — around 24 µg/m³ PM2.5 (moderate), about 4.6× the cleanest month (October, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateGoodModerateFeb 1023 µg/m³Oct 175 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb24Moderate
Mar15Moderate
Apr11Good
May12Moderate
Jun16Moderate
Jul17Moderate
Aug13Moderate
Sep8Good
Oct5Good
Nov8Good
Dec15Moderate
Location & terrain

Where is São Tomé?

São Tomé sits at 0.3°N, 6.7°E, 140 m above sea level, in Sao Tome and Principe. The nearest listed city is Port-Gentil, 257 km away.

Topography around São Tomé

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

Within 3 km, the terrain around São Tomé has only modest variations in elevation — a maximum elevation change of 111 m around an average of 23 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,396 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,938 m.

The land around São Tomé is covered by water (43%), trees (31%) and artificial surfaces (24%) within 3 km, water (60%) and trees (36%) within 16 km, and water (90%) within 80 km.

3 km
111 m
16 km
1,396 m
80 km
1,938 m
treesgrasslandartificial surfaceswater
August weather nearby: Port-Gentil 257 km · Akanda 291 km · Libreville 303 km · Owendo 309 km · Ntoum 337 km · Bata 378 km · Lambaréné 407 km · Malabo 443 km

Sao Tome and Principe travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type C / F
220 V · 50 Hz
Prices
≈ 61% of US
price level, 2025
GDP per capita
$4,084
2025
Safe drinking water
37%
of population, 2024
Homicide rate
3.2
per 100k, 2011
Road deaths
27.9
per 100k/yr, 2019
Income group
Lower middle
World Bank
Religion
Catholic 56%none 21%other 6%Adventist 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 Tomé (0.3376°, 6.7299°, elevation 140 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. 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).