Climate averages 1991–2020
Dumai weather
in July.
A hot, wet month: the joint 3rd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Dumai: daytime highs average 30.3°C and nights cool to about 23.9°C. By daytime temperature it is the joint 3rd warmest of the 12 months.
Expect about 162 mm of rain on roughly 20 days, which makes July a wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 12 min on an average July day.
The nearest other city in this atlas is Port Dickson (103 km away). In July its highs average 29.2°C, 1.1°C cooler than Dumai, with 208 mm of rain.
Among the 200 cities listed in Indonesia, Dumai ranks joint 34th of 200 for the warmest July highs and 167th of 200 for the driest July (rainfall, lowest first). The mean July high of those 200 cities is 29.0°C; Dumai is 1.3°C warmer than that mean.
From July to August, average highs stay level at 30.3°C, and monthly rainfall rises from 162 mm to 195 mm.
The annual picture
July in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Dumai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.9°C23.4°C | 23.4°C | 201 | 21.3 | 12.012 h |
| February | 29.7°C23.6°C | 23.6°C | 125 | 16.9 | 12.112 h |
| March | 30.2°C23.9°C | 23.9°C | 217 | 25.1 | 12.112 h |
| April | 30.3°C24.1°C | 24.1°C | 249 | 27.6 | 12.212 h |
| May | 30.5°C24.3°C | 24.3°C | 224 | 26.3 | 12.212 h |
| June | 30.5°C24.2°C | 24.2°C | 156 | 21.2 | 12.212 h |
| July, selected | 30.3°C23.9°C | 23.9°C | 162 | 20.4 | 12.212 h |
| August | 30.3°C23.8°C | 23.8°C | 195 | 24.0 | 12.212 h |
| September | 30.2°C23.6°C | 23.6°C | 253 | 26.1 | 12.112 h |
| October | 29.8°C23.6°C | 23.6°C | 308 | 28.2 | 12.112 h |
| November | 29.1°C23.4°C | 23.4°C | 387 | 28.5 | 12.012 h |
| December | 28.7°C23.4°C | 23.4°C | 343 | 27.7 | 12.012 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Port Dickson in JulyMalaysia · 103 kmHigh 29.2°C · Low 25.0°C · 208 mm rain
- Malacca in JulyMalaysia · 106 kmHigh 28.8°C · Low 25.3°C · 185 mm rain
- Sepang in JulyMalaysia · 119 kmHigh 29.1°C · Low 24.7°C · 155 mm rain
- Pekanbaru in JulyIndonesia · 128 kmHigh 30.2°C · Low 23.3°C · 124 mm rain
- Seremban in JulyMalaysia · 130 kmHigh 29.2°C · Low 23.8°C · 175 mm rain
- Muar in JulyMalaysia · 132 kmHigh 28.9°C · Low 25.1°C · 175 mm rain
- Cyberjaya in JulyMalaysia · 142 kmHigh 29.7°C · Low 23.5°C · 153 mm rain
- Puchong in JulyMalaysia · 149 kmHigh 30.2°C · Low 23.6°C · 100 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Dumai) is explained once on the Dumai year overview and on the Sources, method and limits page.