Dumai in september: average Weather, Temperature and Climate
Weather in Dumai in september 2025
The weather in Dumai in september comes from statistical datas on the last years. You can view the weather statistics the entire month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
tolerable weather UV index: 7
Weather at 6am
77°F
Partly Cloudy
28% of time
28%
14%
13%
Weather at 12pm
92°F
Moderate rain at times
39% of time
29%
14%
11%
Weather at 6pm
81°F
Partly Cloudy
33% of time
31%
21%
12%
Weather at 3am
77°F
49%
16%
13%
12%
Evolution of daily average temperature and precipitation in Dumai in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Dumai in september.
The climate of Dumai in september is tolerable
In september in Dumai, the climate is wet (with 8.8in of rainfall over 16 days). This is better than the previous month since in august it receives an average of 8.7in of rainfall over 16 days.
The climate is very warm in this city this month. The thermometer averaged maximum of 92°F. In the morning the temperature drops to 77°F. Thus, the mean temperature average in september in Dumai is 85°F. Note that seasonal normals in contrast with those observed in Dumai in the month of september with a maximum record of 101°F in 2018 and a minimum record of 70°F in 2021. You can plan to have 86°F or more throughout the month.
Day length in Dumai in september is 12:07. The sun rises at 06:06 and sets at 18:13.
September: another location on the island of Sumatra?
If you want to go to Sumatra in september, there are destinations with better weather than Dumai:
In september, Palembang, Banda Aceh, Bandar Lampung, Jambi City, Batam and Pulau Bangka have good weather.
Seasonal average climate and temperature of Dumai in september
Check below seasonal norms These datas are set from the weather statements earlier years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 85°F | ||||
| Highest temperature | 92°F | ||||
| Lowest temperature | 77°F | ||||
| Highest record temperature | 101°F (2018) | ||||
| Lowest record temperature | 70°F (2021) | ||||
| Number of days at +86°F | 28 day(s) (93%) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Sea temperature | |||||
| Average sea temperature | 85°F | ||||
| Lowest sea temperature | 83°F | ||||
| Highest sea temperature | 87°F | ||||
| Wind | |||||
| Wind speed | 7km/h | ||||
| Wind temperature | 77°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 8.8in | ||||
| Number of days with rainfall | 16 day(s) (52%) | ||||
| Record daily rainfall | 2.4in (2020) | ||||
| Other climate data | |||||
| Humidity | 92% | ||||
| Visibility | 8.85km | ||||
| Cloud cover | 43% | ||||
| UV index | 7 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:06 | ||||
| Time of sunset | 18:13 | ||||
| Length of day | 12:07 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | tolerable | ||||
How was the weather last september?
Here is the day by day recorded weather in Dumai in september 2024:
74°F to 92°F
76°F to 86°F
76°F to 88°F
76°F to 86°F
76°F to 90°F
76°F to 86°F
74°F to 86°F
76°F to 88°F
74°F to 79°F
74°F to 86°F
72°F to 86°F
74°F to 94°F
74°F to 90°F
74°F to 92°F
74°F to 90°F
74°F to 92°F
74°F to 90°F
76°F to 83°F
72°F to 94°F
72°F to 92°F
74°F to 90°F
76°F to 95°F
76°F to 94°F
76°F to 94°F
76°F to 86°F
74°F to 83°F
72°F to 85°F
74°F to 92°F
76°F to 92°F
74°F to 90°F
Map: other cities on the island of Sumatra in september
Cities near Dumai:
| Pulau Rupat in september | tolerable weather |
| Pekanbaru in september | tolerable weather |
| Tesso Nilo National Park in september | tolerable weather |
| Payakumbuh in september | tolerable weather |
| Padangsidempuan in september | tolerable weather |
| Bukittinggi in september | tolerable weather |
| Kisaran in september | tolerable weather |
| Lac Maninjau in september | tolerable weather |
| Sungaiguntung in september | tolerable weather |
| Pariaman in september | tolerable weather |
| Batam in september | good weather |
| Sibolga in september | tolerable weather |
Click over cities on the map for information about the weather in september.
Dumai
perfect weather
good
tolerable
bad
very bad
Weather data for Dumai in september:
Weather data for Dumai for september are derived from an average of the weather forecast since 2009 in Dumai. There is a margin of error and these forecasts are to be considered as general information only. The weather in Dumai can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Dumai.