Pematangsiantar Temperature by Month

The average annual maximum temperature in Pematangsiantar, Sumatra, Indonesia is 30°C (86°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Pematangsiantar compares to cities worldwide.

The temperature in Pematangsiantar changes very little across the seasons, maintaining a similar climate throughout the year. Maximum daytime temperatures range from a comfortable 29°C (84°F) in December to a very warm 31°C (88°F) in May. Nighttime lows range from 22°C (72°F) in May to 21°C (70°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Pematangsiantar by month:

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest.

The chart below shows the average temperature throughout the year:

Pematangsiantar's average annual maximum temperature is 30°C (86°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Pematangsiantar this rarely lasts long on the ground.

For more on Pematangsiantar's weather, including monthly rainfall, sunshine hours, and humidity, visit our Pematangsiantar climate page.