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Sumba Weather in September
September in Sumba brings very high temperatures, with highs of 31°C (88°F) and nights dropping to 22°C (72°F). With excellent weather conditions overall, it's a good time to visit.
Rainfall in Sumba in September
Historically, approximately a single day this month are expected to have rain, averaging 16 mm (0.6 in). Any rain that does arrive tends to come in a single sharp spell rather than prolonged drizzle.
Temperature in Sumba in September
September is a good time to be in Sumba. Days are excellent, reaching 31°C (88°F), with nights around 22°C (72°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. With overnight lows of 22°C (72°F), evenings stay pleasantly warm.For Sumba itself, July generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Sumba Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
31°C (88°F)
Chance of Rain
4%
Precipitation
16 mm (0.6 in)
Rainy days
a single day
Sumba Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sumba - and find the best time to visit.
Daily Historical Temperatures
46-year average (1976-2025)
Based on our historical records, temperatures in Sumba typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 22°C (72°F).
Average temperatures in September
Daily Historical Precipitation
46-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Sumba in September
Browse day-by-day weather records for Sumba spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sumba historical weather extremes in September
Based on 22 years of weather observations in Sumba between 2004 and 2026, these are the recorded extremes.
- The warmest day in September was on September 3, 2021, with a maximum of 35°C (95°F).
- The coldest September day was on September 3, 2014, with a maximum of 23°C (73°F).
- The lowest overnight temperature recorded in September was 17°C (63°F) (September 2, 2006).
Best Places in Indonesia in September
Find out more about the weather in Indonesia and which places have the best travel conditions in this month. See all of Indonesia 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 Sumba in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Almost no rain is expected, so no need to bring rain gear.
What To Do in Sumba in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling8/10 -
Walking8/10 -
Camping10/10 -
Outdoor sports8/10
Sumba 3-Day Forecast
More climate data for Sumba
See the full Sumba climate overview or explore weather in Indonesia.
Popular in September
Where to go in September - average daytime high across popular destinations.
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