Porto Velho's weather is characterized by a relatively stable and warm climate year-round. Temperatures remain consistently high, with average highs ranging from 33-37°C during the peak summer months of July to September. The rest of the year sees temperatures gradually decrease to around 31-34°C in May and June, before rising again to their highest points. The coolest months are June and July, but even then, temperatures rarely drop below 13-15°C, indicating a mild winter. Overall, Porto Velho's climate is tropical with very little seasonal variation.