São Tomé weather in September
In September, São Tomé sees average daytime highs of 25°C and overnight lows near 24°C, with 46 mm of rain across 7.8 wet days and about 12 hours of daylight. It is the 9th-warmest and 9th-wettest month of the year here.
Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 9% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is São Tomé's 4th-clearest and 4th-windiest month. For the whole year in context, see São Tomé's year-round climate.
- Daytime high
- 25°
- 9th warmest
- Overnight low
- 24°
- 3rd coldest
- Rainfall
- 46 mm
- 7.8 wet days
- Daylight
- 12 hours
- 5:27 AM – 5:27 PM
- Cloud cover
- 69%
- 4th clearest
- Wind
- 20 km/h
- 4th windiest
- Solar energy
- 5.28 kWh/m²
- Travel score
- 6.9
- 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 September
Day-to-day highs hold fairly steady near 25°C through the month.
A typical September day in São Tomé reaches about 25°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 26°C. Set against its neighbours, September runs on par with August and on par with October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 25 | 24 |
| 2 | 25 | 24 |
| 3 | 25 | 24 |
| 4 | 25 | 24 |
| 5 | 25 | 24 |
| 6 | 25 | 24 |
| 7 | 25 | 24 |
| 8 | 25 | 24 |
| 9 | 25 | 24 |
| 10 | 25 | 24 |
| 11 | 25 | 24 |
| 12 | 25 | 24 |
| 13 | 25 | 24 |
| 14 | 25 | 24 |
| 15 | 25 | 24 |
| 16 | 25 | 24 |
| 17 | 25 | 24 |
| 18 | 25 | 24 |
| 19 | 25 | 24 |
| 20 | 25 | 24 |
| 21 | 25 | 24 |
| 22 | 25 | 24 |
| 23 | 25 | 25 |
| 24 | 25 | 25 |
| 25 | 25 | 25 |
| 26 | 25 | 25 |
| 27 | 25 | 25 |
| 28 | 25 | 25 |
| 29 | 25 | 25 |
| 30 | 25 | 25 |
São Tomé weather by month
How September compares with the rest of the year at a glance. September is the 9th-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 26° | 135 | 23.6 | 12 | 4.3 |
| Feb | 28° / 26° | 113 | 19.3 | 12 | 4.6 |
| Mar | 28° / 26° | 133 | 20.5 | 12 | 4.4 |
| Apr | 28° / 26° | 130 | 18.7 | 12 | 4.8 |
| May | 27° / 26° | 119 | 17 | 12 | 5.3 |
| Jun | 25° / 24° | 23 | 4 | 12 | 7.5 |
| Jul | 24° / 24° | 8 | 2 | 12 | 8.0 |
| Aug | 24° / 24° | 14 | 2.6 | 12 | 7.9 |
| Sep | 25° / 24° | 46 | 7.8 | 12 | 6.9 |
| Oct | 26° / 25° | 152 | 21.5 | 12 | 4.9 |
| Nov | 26° / 25° | 210 | 25.7 | 12 | 4.1 |
| Dec | 27° / 25° | 174 | 26.1 | 12 | 4.1 |
Cloud cover in September
The sky is clear or mostly clear about 9% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 27% of September, with mostly cloudy or overcast conditions the remaining 64%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 39 | 38 | 39 | 38 | 38 | 38 | 38 | 38 | 38 | 38 | 37 | 37 | 36 | 36 | 35 | 35 | 35 | 34 | 34 | 34 | 34 | 34 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 34 |
| Cloudier (%) | 61 | 62 | 61 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 63 | 63 | 64 | 64 | 65 | 65 | 65 | 66 | 66 | 66 | 66 | 66 | 67 | 67 | 66 | 66 | 66 | 66 | 66 | 66 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 39 | 61 |
| 2 | 38 | 62 |
| 3 | 39 | 61 |
| 4 | 38 | 62 |
| 5 | 38 | 62 |
| 6 | 38 | 62 |
| 7 | 38 | 62 |
| 8 | 38 | 62 |
| 9 | 38 | 62 |
| 10 | 38 | 62 |
| 11 | 37 | 63 |
| 12 | 37 | 63 |
| 13 | 36 | 64 |
| 14 | 36 | 64 |
| 15 | 35 | 65 |
| 16 | 35 | 65 |
| 17 | 35 | 65 |
| 18 | 34 | 66 |
| 19 | 34 | 66 |
| 20 | 34 | 66 |
| 21 | 34 | 66 |
| 22 | 34 | 66 |
| 23 | 33 | 67 |
| 24 | 33 | 67 |
| 25 | 34 | 66 |
| 26 | 34 | 66 |
| 27 | 34 | 66 |
| 28 | 34 | 66 |
| 29 | 34 | 66 |
| 30 | 34 | 66 |
Chance of precipitation in September
São Tomé gets around 46 mm of rain over 7.8 wet days in September. 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 43% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 12 | 12 | 13 | 14 | 14 | 15 | 16 | 17 | 19 | 20 | 21 | 23 | 24 | 26 | 27 | 28 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 36 | 37 | 38 | 39 | 41 | 42 | 43 |
| Rain chance (%) | |
|---|---|
| 1 | 12 |
| 2 | 12 |
| 3 | 13 |
| 4 | 14 |
| 5 | 14 |
| 6 | 15 |
| 7 | 16 |
| 8 | 17 |
| 9 | 19 |
| 10 | 20 |
| 11 | 21 |
| 12 | 23 |
| 13 | 24 |
| 14 | 26 |
| 15 | 27 |
| 16 | 28 |
| 17 | 30 |
| 18 | 31 |
| 19 | 32 |
| 20 | 33 |
| 21 | 34 |
| 22 | 35 |
| 23 | 36 |
| 24 | 36 |
| 25 | 37 |
| 26 | 38 |
| 27 | 39 |
| 28 | 41 |
| 29 | 42 |
| 30 | 43 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 89% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 31 | 29 | 27 | 25 | 22 | 20 | 18 | 17 | 15 | 14 | 12 | 11 | 10 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 4 | 3 | 3 |
| Oppressive (%) | 69 | 71 | 73 | 75 | 78 | 80 | 82 | 83 | 85 | 86 | 88 | 89 | 90 | 91 | 92 | 92 | 93 | 93 | 94 | 94 | 94 | 95 | 95 | 95 | 96 | 96 | 96 | 96 | 97 | 97 |
| Muggy (%) | Oppressive (%) | |
|---|---|---|
| 1 | 31 | 69 |
| 2 | 29 | 71 |
| 3 | 27 | 73 |
| 4 | 25 | 75 |
| 5 | 22 | 78 |
| 6 | 20 | 80 |
| 7 | 18 | 82 |
| 8 | 17 | 83 |
| 9 | 15 | 85 |
| 10 | 14 | 86 |
| 11 | 12 | 88 |
| 12 | 11 | 89 |
| 13 | 10 | 90 |
| 14 | 9 | 91 |
| 15 | 8 | 92 |
| 16 | 8 | 92 |
| 17 | 7 | 93 |
| 18 | 7 | 93 |
| 19 | 6 | 94 |
| 20 | 6 | 94 |
| 21 | 6 | 94 |
| 22 | 5 | 95 |
| 23 | 5 | 95 |
| 24 | 5 | 95 |
| 25 | 4 | 96 |
| 26 | 4 | 96 |
| 27 | 4 | 96 |
| 28 | 4 | 96 |
| 29 | 3 | 97 |
| 30 | 3 | 97 |
Wind in September
Winds average 20 km/h in September.
Across September, daily wind ranges from about 18 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 20 | breezy |
| 2 | 20 | breezy |
| 3 | 20 | breezy |
| 4 | 20 | breezy |
| 5 | 20 | breezy |
| 6 | 20 | breezy |
| 7 | 20 | light breeze |
| 8 | 20 | light breeze |
| 9 | 20 | light breeze |
| 10 | 20 | light breeze |
| 11 | 20 | light breeze |
| 12 | 20 | light breeze |
| 13 | 20 | light breeze |
| 14 | 20 | light breeze |
| 15 | 20 | light breeze |
| 16 | 20 | light breeze |
| 17 | 20 | light breeze |
| 18 | 20 | light breeze |
| 19 | 19 | light breeze |
| 20 | 19 | light breeze |
| 21 | 19 | light breeze |
| 22 | 19 | light breeze |
| 23 | 19 | light breeze |
| 24 | 19 | light breeze |
| 25 | 19 | light breeze |
| 26 | 19 | light breeze |
| 27 | 19 | light breeze |
| 28 | 19 | light breeze |
| 29 | 19 | light breeze |
| 30 | 18 | light breeze |
Sunrise & sunset in September
Daylight runs from about 12 hours at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 0 minutes over September. Sunrise moves from 5:33 AM to 5:22 AM, and sunset from 5:33 PM to 5:22 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Sunrise (AM) | 5:33 | 5:32 | 5:32 | 5:32 | 5:31 | 5:31 | 5:31 | 5:30 | 5:30 | 5:30 | 5:29 | 5:29 | 5:28 | 5:28 | 5:28 | 5:27 | 5:27 | 5:27 | 5:26 | 5:26 | 5:26 | 5:25 | 5:25 | 5:24 | 5:24 | 5:24 | 5:23 | 5:23 | 5:23 | 5:22 |
| Sunset (PM) | 5:33 | 5:33 | 5:32 | 5:32 | 5:32 | 5:31 | 5:31 | 5:30 | 5:30 | 5:30 | 5:29 | 5:29 | 5:29 | 5:28 | 5:28 | 5:27 | 5:27 | 5:27 | 5:26 | 5:26 | 5:26 | 5:25 | 5:25 | 5:24 | 5:24 | 5:24 | 5:23 | 5:23 | 5:23 | 5:22 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.0 | 5:33 | 5:33 |
| 2 | 12.0 | 5:32 | 5:33 |
| 3 | 12.0 | 5:32 | 5:32 |
| 4 | 12.0 | 5:32 | 5:32 |
| 5 | 12.0 | 5:31 | 5:32 |
| 6 | 12.0 | 5:31 | 5:31 |
| 7 | 12.0 | 5:31 | 5:31 |
| 8 | 12.0 | 5:30 | 5:30 |
| 9 | 12.0 | 5:30 | 5:30 |
| 10 | 12.0 | 5:30 | 5:30 |
| 11 | 12.0 | 5:29 | 5:29 |
| 12 | 12.0 | 5:29 | 5:29 |
| 13 | 12.0 | 5:28 | 5:29 |
| 14 | 12.0 | 5:28 | 5:28 |
| 15 | 12.0 | 5:28 | 5:28 |
| 16 | 12.0 | 5:27 | 5:27 |
| 17 | 12.0 | 5:27 | 5:27 |
| 18 | 12.0 | 5:27 | 5:27 |
| 19 | 12.0 | 5:26 | 5:26 |
| 20 | 12.0 | 5:26 | 5:26 |
| 21 | 12.0 | 5:26 | 5:26 |
| 22 | 12.0 | 5:25 | 5:25 |
| 23 | 12.0 | 5:25 | 5:25 |
| 24 | 12.0 | 5:24 | 5:24 |
| 25 | 12.0 | 5:24 | 5:24 |
| 26 | 12.0 | 5:24 | 5:24 |
| 27 | 12.0 | 5:23 | 5:23 |
| 28 | 12.0 | 5:23 | 5:23 |
| 29 | 12.0 | 5:23 | 5:23 |
| 30 | 12.0 | 5:22 | 5:22 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, 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 — September's 5.28 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 | 5.2 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.4 | Bright |
| 2 | 5.4 | Bright |
| 3 | 5.4 | Bright |
| 4 | 5.4 | Bright |
| 5 | 5.4 | Bright |
| 6 | 5.3 | Bright |
| 7 | 5.3 | Bright |
| 8 | 5.3 | Bright |
| 9 | 5.3 | Bright |
| 10 | 5.3 | Bright |
| 11 | 5.3 | Bright |
| 12 | 5.3 | Bright |
| 13 | 5.3 | Bright |
| 14 | 5.3 | Bright |
| 15 | 5.3 | Bright |
| 16 | 5.2 | Bright |
| 17 | 5.2 | Bright |
| 18 | 5.2 | Bright |
| 19 | 5.2 | Bright |
| 20 | 5.2 | Bright |
| 21 | 5.2 | Bright |
| 22 | 5.2 | Bright |
| 23 | 5.2 | Bright |
| 24 | 5.2 | Bright |
| 25 | 5.2 | Bright |
| 26 | 5.2 | Bright |
| 27 | 5.2 | Bright |
| 28 | 5.2 | Bright |
| 29 | 5.2 | Bright |
| 30 | 5.2 | Bright |
Hazard calendar for São Tomé
None of São Tomé's seasonal hazards are active in September. 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.
Is September a good time to visit São Tomé?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit São Tomé for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for São Tomé in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, São Tomé sees daytime highs around 25°C and nights near 24°C. Worth packing: light clothes and sun protection. About 8 days see rain.
Sea temperature near São Tomé in September
The nearest coast averages about 26°C in September — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 29 | 29 | 29 | 29 | 28 | 27 | 26 | 26 | 26 | 27 | 28 | 28 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm | Warm | Warm | Warm | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 29 | Tropical |
| Mar | 29 | Tropical |
| Apr | 29 | Tropical |
| May | 28 | Tropical |
| Jun | 27 | Warm |
| Jul | 26 | Warm |
| Aug | 26 | Warm |
| Sep | 26 | Warm |
| Oct | 27 | Warm |
| Nov | 28 | Warm |
| Dec | 28 | Tropical |
UV index in São Tomé in September
Clear-sky midday UV in September peaks around 12 (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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 12 | 14 | 13 | 11 | 9 | 9 | 8 | 12 | 13 | 12 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 12 | Extreme |
| Mar | 14 | Extreme |
| Apr | 13 | Extreme |
| May | 11 | Extreme |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 12 | Extreme |
| Oct | 13 | Extreme |
| Nov | 12 | Extreme |
| Dec | 11 | Extreme |
Air quality in São Tomé in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 22 | 24 | 15 | 11 | 12 | 16 | 17 | 13 | 8 | 5 | 8 | 15 |
| Level | Moderate | Moderate | Moderate | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 22 | Moderate |
| Feb | 24 | Moderate |
| Mar | 15 | Moderate |
| Apr | 11 | Good |
| May | 12 | Moderate |
| Jun | 16 | Moderate |
| Jul | 17 | Moderate |
| Aug | 13 | Moderate |
| Sep | 8 | Good |
| Oct | 5 | Good |
| Nov | 8 | Good |
| Dec | 15 | Moderate |
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.
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
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).