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Pematangsiantar weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Pematangsiantar?
For a warm holiday, the best week has been 6–12 February (Weather Index 75). Favourable start dates for a 7-day trip run from 29 January to 20 February. May is warmest (31°C), March and July are driest and February, June and July have the most sun.
- Warmest
- May 31°C
- Coolest
- January, November and December 29°C
- Driest
- March and July 84% rain-day chance
- Wettest
- November more than 99% rain-day chance
- Sunniest
- February, June and July 10 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Pematangsiantar
Pematangsiantar historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 29.1 | 22.2 | 89.4 | 27.7 | 256.4 | 8.5 |
| February | 29.6 | 22.2 | 87.1 | 24.4 | 197.6 | 9.7 |
| March | 30.1 | 22.6 | 84.2 | 26.1 | 212.1 | 9.3 |
| April | 30.3 | 23.0 | 94.0 | 28.2 | 240.4 | 8.4 |
| May | 30.6 | 23.3 | 94.2 | 29.2 | 298.2 | 8.6 |
| June | 30.4 | 22.8 | 92.3 | 27.7 | 256.7 | 9.5 |
| July | 30.4 | 22.5 | 83.5 | 25.9 | 206.3 | 9.7 |
| August | 30.1 | 22.4 | 90.0 | 27.9 | 287.8 | 8.9 |
| September | 29.8 | 22.4 | 97.7 | 29.3 | 328.1 | 8.5 |
| October | 29.6 | 22.4 | 95.8 | 29.7 | 341.3 | 7.9 |
| November | 29.0 | 22.6 | 99.7 | 29.9 | 391.7 | 6.7 |
| December | 28.7 | 22.5 | 94.5 | 29.3 | 349.9 | 7.5 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.