Common information
CountryIndonesia
Population143 760
Weather, climate, temperature by months in Dumai
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 38 | 36 | 40 | 38 | 37 | 38 | 38 | 37 | 35 | 38 | 37 | 35 | 40 |
| Average high, °C | 30 | 31 | 30 | 30 | 31 | 32 | 32 | 32 | 31 | 31 | 30 | 30 | 31 |
| Average temperature, °C | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 27 | 27 | 27 |
| Average low, °C | 22 | 23 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 22 | 22 | 22 |
| Record low, °C | 21 | 21 | 20 | 20 | 21 | 20 | 20 | 19 | 20 | 20 | 21 | 20 | 19 |
| Fog, days | 7 | 6 | 2 | 1 | 1 | 0 | 4 | 5 | 5 | 6 | 5 | 9 | 51 |
| Thunderstorms, days | 14 | 16 | 16 | 7 | 3 | 6 | 12 | 18 | 19 | 15 | 16 | 13 | 155 |
| Average precipitation, mm. | 218 | 233 | 238 | 204 | 156 | 145 | 186 | 213 | 166 | 165 | 156 | 181 | 2260 |
| Relative humidity, % | 84 | 84 | 85 | 84 | 82 | 81 | 82 | 84 | 84 | 83 | 84 | 83 | 83 |
| Relative humidity morning, % | 97 | 97 | 97 | 94 | 92 | 92 | 95 | 97 | 97 | 97 | 97 | 97 | 96 |
| Relative humidity evening, % | 70 | 71 | 75 | 71 | 63 | 64 | 67 | 71 | 71 | 69 | 69 | 69 | 69 |
| Wind speed, km/h | 7 | 7 | 7 | 8 | 9 | 9 | 8 | 7 | 7 | 7 | 7 | 7 | 8 |
| Day Length, of hours | 13 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 12 |
| Dew point, °C | 24 | 24 | 25 | 24 | 24 | 24 | 24 | 25 | 25 | 24 | 24 | 24 | 291 |
| Growing degree-day, °C | 516 | 536 | 516 | 521 | 524 | 489 | 549 | 531 | 549 | 522 | 530 | 533 | 6315 |
| Solar radiation, global, Mj/m2 | 18 | 18 | 16 | 15 | 18 | 20 | 21 | 20 | 18 | 18 | 18 | 18 | 18 |