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São Tomé Weather in September
September is one of the excellent months to visit São Tomé, with daytime temperatures of 27°C (81°F) and lows of 24°C (75°F) at night. Do note that quite a bit of rainfall is typical, averaging around 65 mm (2.6 in).
Rainfall in São Tomé in September
Records from the past 30 years suggest around 14 days of rain, with 65 mm (2.6 in) average for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in São Tomé in September
São Tomé in September has excellent weather. Days reach 27°C (81°F) and nights cool to 24°C (75°F). This kind of day-to-night contrast is typical for this time of year. At 24°C (75°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in São Tomé in September
The area enjoys a balanced 121 hours of sunlight, ensuring it's neither too overcast nor too sunny.Our weather planner can help you find worldwide destinations with pleasant weather during this period. June, July, August and September typically offer the best weather for São Tomé.
São Tomé Temperature in September
Min Temperature
24°C (75°F)
Max Temperature
27°C (81°F)
Chance of Rain
46%
Precipitation
65 mm (2.6 in)
Rainy days
14 days
Humidity
80%
Sunshine
121 hours
Percentage Sunshine
São Tomé Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in São Tomé - and find the best time to visit.
Historical weather records for São Tomé in September
Browse day-by-day weather records for São Tomé spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
São Tomé historical weather extremes in September
The extremes listed below come from historical weather data collected in São Tomé from 2006 through 2025.
- São Tomé recorded its highest September temperature of 33°C (91°F) on September 26, 2021.
- São Tomé experienced its chilliest September day on September 1, 2006, reaching only 25°C (77°F).
- The lowest overnight temperature recorded in September was 20°C (68°F) (September 26, 2013).
Best Places in São Tomé & Príncipe in September
Find out more about the weather in São Tomé & Príncipe and which places have the best travel conditions in this month. See all of São Tomé & Príncipe in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in São Tomé in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Rain gear is recommended, you can expect wet weather on multiple days. Sunglasses could come in handy during the sunnier parts of your trip.
What To Do in São Tomé in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling8/10 -
Walking8/10 -
Camping8/10 -
Outdoor sports8/10
São Tomé 3-Day Forecast
More climate data for São Tomé
Temperature Rainfall Sunshine Humidity
See the full São Tomé climate overview or explore weather in São Tomé & Príncipe.
Popular in September
Where to go in September - average daytime high across popular destinations.
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