Climate averages 1991–2020
Dumai weather
in May.
A hot, very wet month: one of the warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Dumai: daytime highs average 30.5°C and nights cool to about 24.3°C. By daytime temperature it is one of the warmest months of the year.
Expect about 224 mm of rain on roughly 26 days, which makes May a very wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 12 min on an average May day.
The nearest other city in this atlas is Port Dickson (103 km away). In May its highs average 29.6°C, 0.9°C cooler than Dumai, with 218 mm of rain.
Among the 200 cities listed in Indonesia, Dumai ranks joint 5th of 200 for the warmest May highs and 163rd of 200 for the driest May (rainfall, lowest first). The mean May high of those 200 cities is 29.2°C; Dumai is 1.3°C warmer than that mean.
From May to June, average highs stay level at 30.5°C, and monthly rainfall falls from 224 mm to 156 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Port Dickson in MayMalaysia · 103 kmHigh 29.6°C · Low 25.3°C · 218 mm rain
- Malacca in MayMalaysia · 106 kmHigh 29.4°C · Low 25.6°C · 217 mm rain
- Sepang in MayMalaysia · 119 kmHigh 29.5°C · Low 25.0°C · 197 mm rain
- Pekanbaru in MayIndonesia · 128 kmHigh 30.4°C · Low 23.9°C · 191 mm rain
- Seremban in MayMalaysia · 130 kmHigh 29.8°C · Low 24.3°C · 220 mm rain
- Muar in MayMalaysia · 132 kmHigh 29.5°C · Low 25.3°C · 213 mm rain
- Cyberjaya in MayMalaysia · 142 kmHigh 29.9°C · Low 23.9°C · 220 mm rain
- Puchong in MayMalaysia · 149 kmHigh 30.1°C · Low 24.0°C · 154 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.