Average annual temperature is 25.5 °C
Absolute maximum temperature: 34.4 °C
Absolute minimum temperature: 19.6 °C
Number of sunny days: 11 days
Number of rainy days: 354 days
Look at detailed online map of Bandarsiantar
* Weather data for Bandarsiantar Indonesia is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 30.0 | 30.1 | 32.0 | 32.7 | 32.8 | 34.4 | 34.1 | 32.8 | 33.1 | 32.6 | 30.9 | 30.8 |
| Average daytime temperature (°C) | 28.5 | 28.8 | 29.8 | 30.5 | 31.1 | 31.2 | 31.1 | 30.4 | 30.6 | 29.9 | 29.2 | 28.8 |
| Average temperature (°C) | 24.4 | 24.5 | 24.9 | 25.7 | 26.2 | 26.3 | 26.2 | 25.6 | 25.9 | 25.4 | 25.1 | 25.1 |
| Average night temperature (°C) | 21.7 | 21.5 | 21.7 | 22.6 | 23.0 | 23.1 | 22.9 | 22.7 | 23.0 | 22.6 | 22.7 | 22.6 |
| Absolute minimum temperature (°C) | 19.7 | 19.6 | 20.5 | 20.6 | 21.6 | 22.2 | 21.7 | 21.9 | 22.3 | 21.5 | 22.2 | 22.0 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 |
| Daylight mean duration (h) | 12.0 | 12.0 | 12.1 | 12.2 | 12.3 | 12.3 | 12.3 | 12.2 | 12.1 | 12.0 | 12.0 | 11.9 |
| Daylight minimum duration (h) | 11.0 | 11.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 |
| Sunshine mean duration (h) | 8.0 | 8.9 | 8.8 | 8.0 | 8.7 | 8.6 | 8.7 | 7.8 | 7.6 | 7.0 | 6.5 | 7.0 |
| Precipitation (mm) | 268 | 229 | 267 | 228 | 316 | 230 | 180 | 364 | 304 | 539 | 365 | 462 |
| Sunny days | 1 | 0 | 0 | 0 | 2 | 3 | 4 | 0 | 1 | 0 | 0 | 0 |
| Rainy days | 30 | 28 | 31 | 30 | 29 | 27 | 27 | 31 | 29 | 31 | 30 | 31 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Bandarsiantar is at