The altcoin market is experiencing a significant upswing in September 2025, with key indicators pointing to an accelerated altcoin season. The Altcoin Season Index (ASI) has reached 80 points, marking its highest level this year, as altcoins continue to outperform Bitcoin. Analyst Maartunn noted a notable increase in altcoin trading volumes, while Bitcoin and Ethereum volumes have declined, suggesting a liquidity shift towards altcoins. Technical analysis indicates that TOTAL3, representing the total altcoin market cap excluding Bitcoin and Ethereum, is forming a bullish triangle pattern, hinting at a potential breakout. This rising liquidity has also led to new exchange listings, further boosting altcoin trading volumes. Analysts predict the altcoin season could extend from 17 to 117 days, based on historical cycles.