Climate averages 1991–2020
Pematangsiantar weather
in May.
A hot, very wet month: the 2nd 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 Pematangsiantar: daytime highs average 28.2°C and nights cool to about 21.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 265 mm of rain on roughly 29 days, which makes May a very wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 15 min on an average May day.
The nearest other city in this atlas is Tebingtinggi (42 km away). In May its highs average 30.1°C, 1.8°C warmer than Pematangsiantar, with 203 mm of rain.
Among the 200 cities listed in Indonesia, Pematangsiantar ranks joint 162nd of 200 for the warmest May highs and joint 185th of 200 for the driest May (rainfall, lowest first). The mean May high of those 200 cities is 29.2°C; Pematangsiantar is 0.9°C cooler than that mean.
From May to June, average highs rise by 0.1°C to 28.3°C, and monthly rainfall falls from 265 mm to 231 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
Pematangsiantar climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.6°C20.2°C | 20.2°C | 240 | 27.9 | 12.012 h |
| February | 27.1°C20.2°C | 20.2°C | 190 | 24.3 | 12.012 h |
| March | 27.8°C20.7°C | 20.7°C | 217 | 26.4 | 12.112 h |
| April | 27.9°C21.0°C | 21.0°C | 249 | 28.6 | 12.212 h |
| May, selected | 28.2°C21.3°C | 21.3°C | 265 | 29.2 | 12.312 h |
| June | 28.3°C21.1°C | 21.1°C | 231 | 27.1 | 12.312 h |
| July | 28.1°C20.8°C | 20.8°C | 236 | 26.7 | 12.312 h |
| August | 27.9°C20.7°C | 20.7°C | 274 | 28.7 | 12.212 h |
| September | 27.5°C20.6°C | 20.6°C | 361 | 29.4 | 12.112 h |
| October | 27.1°C20.6°C | 20.6°C | 375 | 30.2 | 12.112 h |
| November | 26.6°C20.6°C | 20.6°C | 351 | 29.4 | 12.012 h |
| December | 26.3°C20.5°C | 20.5°C | 315 | 29.6 | 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
- Tebingtinggi in MayIndonesia · 42 kmHigh 30.1°C · Low 24.1°C · 203 mm rain
- Kisaran in MayIndonesia · 61 kmHigh 30.4°C · Low 24.1°C · 232 mm rain
- Kabanjahe in MayIndonesia · 66 kmHigh 25.6°C · Low 17.9°C · 196 mm rain
- Perbaungan in MayIndonesia · 69 kmHigh 30.0°C · Low 24.6°C · 182 mm rain
- Percut in MayIndonesia · 77 kmHigh 30.1°C · Low 24.0°C · 250 mm rain
- Tanjungbalai in MayIndonesia · 81 kmHigh 30.1°C · Low 25.0°C · 235 mm rain
- Medan in MayIndonesia · 82 kmHigh 30.2°C · Low 23.2°C · 279 mm rain
- Sunggal in MayIndonesia · 85 kmHigh 30.3°C · Low 22.8°C · 266 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 Pematangsiantar) is explained once on the Pematangsiantar year overview and on the Sources, method and limits page.