Weather in Sumatra - 14-day forecast

Detailed weather forecast for Sumatra, Indonesia: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Sumatra

today☀️ 31°💧 0.8 mm

Sun☁️ 34°💧 0.6 mm

Mon☁️ 34°💧 1.2 mm

Tue☁️ 36°💧 0.8 mm

Wed🌧️ 31°💧 5.3 mm

Thu🌧️ 35°💧 4.2 mm

Fri🌧️ 27°💧 1.7 mm

Sat🌧️ 28°💧 16.9 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Saturday 5 Sept in Sumatra, the forecast high is 31°C. Typical daytime temperatures at this time of year range from 27°C to 29°C, so it will be exceptionally warm. It is warmer than 99% of similar days.

Saturday 5 Sept

31°Cexceptionally warm

usually 27°C–29°C

warmer than 99% of similar days

night: exceptionally warm rain: typical rainfall wind: exceptionally strong

Sunday 6 Sept

34°Cexceptionally warm

usually 27°C–29°C

warmer than 99% of similar days

night: exceptionally warm rain: typical rainfall wind: exceptionally strong

Monday 7 Sept

34°Cexceptionally warm

usually 27°C–29°C

warmer than 99% of similar days

night: exceptionally warm rain: typical rainfall wind: stronger than usual

Tuesday 8 Sept

36°Cexceptionally warm

usually 27°C–29°C

warmer than 99% of similar days

night: exceptionally warm rain: typical rainfall wind: stronger than usual

Wednesday 9 Sept

31°Cexceptionally warm

usually 27°C–29°C

warmer than 99% of similar days

night: exceptionally warm rain: typical rainfall wind: exceptionally strong

Thursday 10 Sept

35°Cexceptionally warm

usually 27°C–29°C

warmer than 99% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Friday 11 Sept

27°Ccooler than usual

usually 27°C–29°C

cooler than 82% of similar days

night: exceptionally warm rain: typical rainfall wind: exceptionally strong

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 28°C by day. The coolest year was 1997 (27°C) and the warmest was 1982 (30°C). The current forecast averages 33°C - higher than in 100% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Sumatra

Sumatra - 14-day weather forecast infographic

Day-by-day forecast for Sumatra

Saturday5 September 2026

☀️31°clear sky

sunrise 06:10 · sunset 18:16 · night 24° · evening 29° · rain 0.79 mm · humidity 48% · wind 3 m/s · clouds 5%

Sunday6 September 2026

☁️34°broken clouds

sunrise 06:10 · sunset 18:16 · night 25° · evening 29° · rain 0.6 mm · humidity 37% · wind 2 m/s · clouds 81%

Monday7 September 2026

☁️34°overcast clouds

sunrise 06:10 · sunset 18:16 · night 25° · evening 28° · rain 1.2 mm · humidity 35% · wind 2 m/s · clouds 93%

Tuesday8 September 2026

☁️36°overcast clouds

sunrise 06:09 · sunset 18:15 · night 27° · evening 28° · rain 0.84 mm · humidity 35% · wind 2 m/s · clouds 88%

Wednesday9 September 2026

🌧️31°light rain

sunrise 06:09 · sunset 18:15 · night 24° · evening 25° · rain 5.32 mm · humidity 62% · wind 3 m/s · clouds 98%

Thursday10 September 2026

🌧️35°light rain

sunrise 06:09 · sunset 18:15 · night 24° · evening 27° · rain 4.24 mm · humidity 41% · wind 2 m/s · clouds 100%

Friday11 September 2026

🌧️27°light rain

sunrise 06:08 · sunset 18:14 · night 24° · evening 25° · rain 1.68 mm · humidity 74% · wind 3 m/s · clouds 100%

Saturday12 September 2026

🌧️28°moderate rain

sunrise 06:08 · sunset 18:14 · night 24° · evening 24° · rain 16.89 mm · humidity 76% · wind 2 m/s · clouds 82%

Sunday13 September 2026

🌧️30°light rain

sunrise 06:08 · sunset 18:14 · night 24° · evening 24° · rain 8.85 mm · humidity 63% · wind 2 m/s · clouds 100%

Monday14 September 2026

☁️32°overcast clouds

sunrise 06:07 · sunset 18:13 · night 25° · evening 26° · rain 1.29 mm · humidity 48% · wind 3 m/s · clouds 89%

Tuesday15 September 2026

☁️33°broken clouds

sunrise 06:07 · sunset 18:13 · night 25° · evening 28° · rain 12.21 mm · humidity 45% · wind 2 m/s · clouds 82%

Wednesday16 September 2026

🌧️32°moderate rain

sunrise 06:07 · sunset 18:13 · night 24° · evening 26° · rain 9.42 mm · humidity 58% · wind 2 m/s · clouds 83%

Thursday17 September 2026

🌧️29°light rain

sunrise 06:06 · sunset 18:12 · night 23° · evening 24° · rain 11.43 mm · humidity 70% · wind 2 m/s · clouds 100%

Friday18 September 2026

🌧️33°moderate rain

sunrise 06:06 · sunset 18:12 · night 23° · evening 24° · rain 15.3 mm · humidity 54% · wind 1 m/s · clouds 78%

Saturday19 September 2026

🌧️35°light rain

sunrise 06:05 · sunset 18:12 · night 24° · evening 24° · rain 0.93 mm · humidity 41% · wind 2 m/s · clouds 95%

Sunday20 September 2026

🌧️34°light rain

sunrise 06:05 · sunset 18:11 · night 24° · evening 26° · rain 0.69 mm · humidity 44% · wind 2 m/s · clouds 97%

UV index in Sumatra - is it safe to sunbathe?

Today the UV index in Sumatra is 9 (very high) - unprotected fair skin can burn in about 20 minutes. SPF 50, long sleeves and shade between 10:00 and 16:00.

Upcoming public holidays in Indonesia: Christmas Day — 25 December · New Year's Day — 1 January · Good Friday — 26 March.

Nearby and related places

MalaccaSerembanSumbaLombokSumbawaJakartaTimorBorneo

FAQ - Sumatra weather

What is the weather like in Sumatra today?

Today it is about 31° during the day and 24° at night, clear sky.

How far ahead can I check the forecast for Sumatra?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.