Temperature
Pleasant by day, warm at night.
77°Ftypical September high
Typical range
September climate
September in Sao Tome
Sao Tome and Principe · Africa
Warm coastal days and some sun.
Excellent time to visit
Early to mid
Daytime high
77°F
Lows around 76°F
Rain
Several rainy days
Sun
10 h/day
Air feel
Humid
Sea temp
79°F
Great for swimming
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days, mostly brief and on-and-off. About 8 wet days, fewer than in most months.
27%wet-day frequency
AmountWet-day chance
Sunshine
A mix of sunshine and cloud.
10 hSeptember sunshine
Heat & humidity by month
Warm days, with humid periods.
100%September Heat feel
Easy airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 78° and nights feel near 77°.
ComfortableWarmHotNight hours
Clear sky
Mostly cloudy skies this month.
27%September Clear sky
Clear skyCloud
Wind pattern
September's typical breeze keeps the air from feeling as stagnant.
12 mphSeptember Breezy
Sea temperature
79°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September stays around 77°F through the day and night.
Avg temp Typical range
Morning77°F
Rain19%
Cloud74%
Humid airVery high
Sun intensityModerate
Midday77°F
Rain17%
Cloud71%
Humid airVery high
Sun intensityStrong
Late afternoon77°F
Rain12%
Cloud68%
Humid airVery high
Sun intensityLow
Early evening77°F
Rain12%
Cloud70%
Humid airVery high
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 81 | 78 | 5.2 | 23 | 10.2 | 82 | 83 |
| Feb | 82 | 79 | 4.5 | 19 | 10.2 | 82 | 84 |
| Mar | 82 | 79 | 5.2 | 20 | 9.7 | 81 | 85 |
| Apr | 82 | 79 | 5.2 | 18 | 9.4 | 82 | 84 |
| May | 80 | 78 | 4.7 | 17 | 9.8 | 83 | 83 |
| Jun | 77 | 76 | 0.9 | 5 | 10.3 | 83 | 79 |
| Jul | 76 | 74 | 0.3 | 2 | 10.3 | 82 | 78 |
| Aug | 76 | 74 | 0.6 | 3 | 10.2 | 83 | 78 |
| Sep | 77 | 76 | 1.9 | 8 | 10.0 | 84 | 79 |
| Oct | 79 | 77 | 6.5 | 22 | 9.9 | 84 | 81 |
| Nov | 80 | 77 | 8.5 | 25 | 9.8 | 84 | 82 |
| Dec | 80 | 78 | 7.2 | 26 | 9.8 | 83 | 83 |
Similar climates
Similar
Similar travel styleSt. LuciaSaint LuciaSimilar travel styleMooreaFrench PolynesiaSimilar travel styleBocas del ToroPanamaSimilar travel styleSavusavuFiji
Want a side-by-side climate view? Compare Sao Tome with St. Lucia.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology