Riau Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Riau, Indonesia in September.

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Pekanbaru Dumai Duri

Planning a journey to Riau, Indonesia this September and curious over the weather conditions to await? Your essential details are found on this page, answering your query:

What to Expect in Riau in September

Riau, Indonesia is a region in Indonesia. September in Riau generally has very warm temperatures, with heavy precipitation.

Temperatures

You can expect very warm maximum daytime temperatures of around 33°C (91°F) and nighttime temperatures around 24°C (75°F) in Pekanbaru. The temperatures mentioned for daytime and nighttime are general averages. However there can be days that surpass these temperatures. So equip yourself with clothing that can handle the potential heat.

To learn more about the conditions in specific areas of Riau, Indonesia, check out the map below.

Precipitation

In September, precipitation varies across different areas. From heavy rainfall in Pekanbaru with an average of 213 mm (8.4 in) to heavy rainfall in Dumai with 266 mm (10 in).

Explore Riau by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Best Places to Visit in Riau in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Riau.

Conditions Temperatures Precipitation
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).

Popular Destinations in Riau

What is the weather like in September for some of the most popular destinations in Riau, Indonesia?

Temperature range in Riau (September)

Precipitation variation in Riau (September)

Pekanbaru

In September Pekanbaru generally has very high temperatures with maximum daytime temperatures around 33°C (91°F), minimum nighttime temperatures around 24°C (75°F) and heavy monthly rainfall. So on average the conditions are poor that month.

« August
September
October »
August
September
October
Max temperature
33°C (91°F)
33°C (91°F)
33°C (91°F)
Min temperature
24°C (75°F)
24°C (75°F)
24°C (75°F)
Monthly rainfall
170 mm (6.7 in)
213 mm (8.4 in)
257 mm (10 in)
Monthly rainy days
15 days
16 days
19 days
Weather conditions
tolerable
poor
poor
Climate in Pekanbaru →

Dumai

In September Dumai generally has very high temperatures with maximum daytime temperatures around 33°C (91°F), minimum nighttime temperatures around 24°C (75°F) and heavy monthly rainfall. So on average the conditions are poor that month.

« August
September
October »
August
September
October
Max temperature
33°C (91°F)
33°C (91°F)
33°C (91°F)
Min temperature
24°C (75°F)
24°C (75°F)
24°C (75°F)
Monthly rainfall
200 mm (7.9 in)
266 mm (10 in)
311 mm (12 in)
Monthly rainy days
15 days
17 days
20 days
Weather conditions
poor
poor
poor
Climate in Dumai →

Duri

In September Duri generally has very high temperatures with maximum daytime temperatures around 33°C (91°F), minimum nighttime temperatures around 24°C (75°F) and heavy monthly rainfall. So on average the conditions are poor that month.

« August
September
October »
August
September
October
Max temperature
33°C (91°F)
33°C (91°F)
33°C (91°F)
Min temperature
24°C (75°F)
24°C (75°F)
24°C (75°F)
Monthly rainfall
174 mm (6.9 in)
231 mm (9.1 in)
267 mm (11 in)
Monthly rainy days
15 days
17 days
20 days
Weather conditions
tolerable
poor
poor
Climate in Duri →

Is your destination not in the list? Have a look at all destinations in Riau, in Indonesia.

In our records: Indonesia September extremes

Notable September records observed across cities in Indonesia in our climate database (1976 – 2026). Historic readings can vary in quality, so treat these as illustrative.

  • In our records, the coldest September daytime high in Indonesia was 18°C (64°F) in Bandung on September 23, 2003.

Popular cities in September

Day & night temperatures, rainfall and average weather in Riau in September.

City Weather Day temp Night temp Rainfall
Pekanbaru 33°C (91°F) 24°C (75°F) 213 mm (8.4 in)
Dumai 33°C (91°F) 24°C (75°F) 266 mm (10 in)
Duri 33°C (91°F) 24°C (75°F) 231 mm (9.1 in)

Riau weather in September: frequently asked questions

What is the weather like in Riau, Indonesia in September?

In September, Riau, Indonesia generally has poor weather conditions. Pekanbaru sees daytime temperatures near 33°C (91°F), with nights cooling to roughly 24°C (75°F).

What is the average temperature in Riau, Indonesia in September?

In Pekanbaru, the average daytime high in September is 33°C (91°F), while nighttime temperatures drop to around 24°C (75°F).

Does Riau, Indonesia get a lot of rain in September?

Rainfall in Riau, Indonesia peaks during September. Pekanbaru averages roughly 213 mm (8.4 in), so frequent and sometimes heavy showers are the norm.

Is September a Good Time to Visit Riau, Indonesia?

In our opinion, September may not be the ideal time to visit Riau, Indonesia due to the typically poor weather in Pekanbaru.

Generally speaking, the best visiting conditions can be found in offering mostly poor weather in Pekanbaru.

Interested in more climate information?

We have much more information about the climate in Riau.

Weather and climate has detailed information for every country in the world. Are you going to Indonesia? Get detailed historical weather averages for many cities in Indonesia.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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