Average annual temperature is 18.4 °C
Absolute maximum temperature: 42.9 °C
Absolute minimum temperature: 1.5 °C
Number of sunny days: 277 days
Number of rainy days: 88 days
Look at detailed online map of Old Siam
* Weather data for Old Siam Australia is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 42.0 | 41.2 | 38.4 | 30.0 | 24.0 | 26.1 | 20.3 | 29.5 | 35.9 | 35.7 | 42.5 | 42.9 |
| Average daytime temperature (°C) | 33.7 | 33.4 | 29.7 | 23.7 | 19.4 | 17.0 | 16.8 | 20.4 | 26.2 | 25.9 | 30.5 | 30.0 |
| Average temperature (°C) | 25.8 | 25.4 | 22.2 | 17.3 | 13.5 | 12.1 | 10.7 | 13.3 | 18.1 | 18.0 | 22.1 | 22.5 |
| Average night temperature (°C) | 18.7 | 18.0 | 15.6 | 11.8 | 8.5 | 8.2 | 5.8 | 7.5 | 10.1 | 10.6 | 14.5 | 15.8 |
| Absolute minimum temperature (°C) | 13.9 | 10.6 | 11.6 | 7.3 | 4.7 | 3.1 | 1.5 | 2.4 | 2.4 | 5.9 | 10.9 | 11.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 14.0 | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 |
| Daylight mean duration (h) | 14.0 | 13.2 | 12.3 | 11.3 | 10.5 | 10.1 | 10.3 | 11.0 | 11.9 | 12.9 | 13.8 | 14.2 |
| Daylight minimum duration (h) | 13.0 | 12.0 | 11.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 |
| Sunshine mean duration (h) | 11.7 | 11.7 | 10.3 | 8.9 | 8.1 | 7.3 | 8.2 | 8.8 | 10.9 | 11.6 | 12.1 | 11.7 |
| Precipitation (mm) | 18 | 6 | 7 | 41 | 9 | 55 | 4 | 9 | 3 | 2 | 17 | 105 |
| Sunny days | 24 | 26 | 24 | 22 | 20 | 17 | 23 | 20 | 24 | 29 | 24 | 24 |
| Rainy days | 7 | 2 | 7 | 8 | 11 | 13 | 8 | 11 | 6 | 2 | 6 | 7 |
| Snow days | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The largest precipitation sum in Old Siam is at