This study analyzes trends and variability in climate parameters, specifically precipitation and air temperature in three regions with distinct geographic characteristics in Indonesia: Surakarta / Solo (lowlands of Java), Mataram (dry tropical island), and Wamena (highlands of Papua), during the period 1995–2025. ERA5-Land reanalysis data from the ECMWF were extracted using Google Earth Engine and analyzed using the Modified Mann-Kendall trend test, Sen’s Slope estimation, the Precipitation Concentration Index (PCI). The results indicate that Wamena experienced the most significant climate change, with clear upward trends in rainfall intensity indices (SDII, R95p, PRCPTOT), rainfall frequency indices (R10mm, R20mm), and temperature extremes (TXx, TN90p). In contrast, Surakarta and Mataram did not show significant precipitation trends, suggesting that long-term rainfall signals in these regions may be obscured by strong interannual variability. Nevertheless, all three locations exhibited consistent and statistically significant trends toward warmer average temperatures and an increase in the frequency of warm nights (TN90p), underscoring the uniform impact of anthropogenic climate change across Indonesia’s various climate zones. These findings underscore the importance of region-specific climate adaptation strategies in water resource management and agricultural planning in Indonesia.