Historical Data Suggests Ether Could Weaken in September Despite August Rally and ETF Inflows

Ether September seasonality often turns negative after strong August rallies: historical data shows that when ETH gains in August, September has averaged a 6.42% decline, though 2025 dynamics—spot Ether ETFs and corporate treasuries—could alter this pattern.

• Historical pattern: When Ether rose in August (2017, 2020, 2021) it fell the following September.

• New variables: Spot Ether ETFs and corporate crypto treasuries create a different liquidity environment in 2025.

• Market flows: August saw major net inflows into spot Ether ETFs (~$2.79B) while BTC spot ETFs saw outflows (approx. $1.2B).

Meta description: Ether September seasonality: historical September pulls after August gains, now challenged by spot Ether ETFs and treasury demand—read key takeaways and how to prepare.

Since 2016, whenever Ether’s price has gone up in August, it has historically fallen in September, data shows.

Ether’s price has climbed 25% since the beginning of August, but historical data suggests the cryptocurrency could lose steam in September. ETH seasonality has shown repeated August-to-September reversals, though 2025’s ETF inflows and treasury accumulations may change that outcome.

‘,
‘

🚀 Advanced Trading Tools Await You!
Maximize your potential. Join now and start trading!

‘,
‘

📈 Professional Trading Platform
Leverage advanced tools and a wide range of coins to boost your investments. Sign up now!

‘
];

var adplace = document.getElementById(“ads-bitget”);
if (adplace) {
var sessperindex = parseInt(sessionStorage.getItem(“adsindexBitget”));
var adsindex = isNaN(sessperindex) ? Math.floor(Math.random() * adscodesBitget.length) : sessperindex;
adplace.innerHTML = adscodesBitget[adsindex];
sessperindex = adsindex === adscodesBitget.length – 1 ? 0 : adsindex + 1;
sessionStorage.setItem(“adsindexBitget”, sessperindex);
}
})();

Market participants are watching whether spot Ether ETFs and corporate treasury buys will sustain momentum through September. Crypto trader CryptoGoos noted the question plainly: “ETH seasonality in September during post-halving years is typically negative. Will this time be different?”

Ether is trading at $4,759 at the time of publication, up roughly $952 from its Aug. 1 opening price of $3,807, according to CoinMarketCap. The crypto asset crossed highs above $4,867 following dovish remarks at the Jackson Hole symposium that markets interpreted as easing the path to lower rates.

What does history say about Ether in September?

History shows caution: since 2016, September has delivered an average loss of 6.42% for Ether, based on CoinGlass data. In the three notable years when August was strongly positive (2017, 2020, 2021), each September saw a material pullback.

Since 2016, September has delivered an average loss of 6.42% for Ether. Source: CoinGlass

Examples: 2017 saw a 92.86% August surge followed by a 21.65% September drop. In 2020, Ether gained 25.32% in August and fell 17.08% in September. In 2021, a 35.62% August rise preceded a 12.55% September decline. These outcomes highlight a recurring seasonal vulnerability.

‘,
‘

🔒 Secure and Fast Transactions
Diversify your investments with a wide range of coins. Join now!

‘,
‘

💎 The Easiest Way to Invest in Crypto
Dont wait to get started. Click now and discover the advantages!

‘
];

var adplace = document.getElementById(“ads-binance”);
if (adplace) {
var sessperindex = parseInt(sessionStorage.getItem(“adsindexBinance”));
var adsindex = isNaN(sessperindex) ? Math.floor(Math.random() * adscodesBinance.length) : sessperindex;
adplace.innerHTML = adscodesBinance[adsindex];
sessperindex = adsindex === adscodesBinance.length – 1 ? 0 : adsindex + 1;
sessionStorage.setItem(“adsindexBinance”, sessperindex);
}
})();

How could 2025 differ from past seasonal patterns?

2025 introduces two major differences: active spot Ether ETFs and sizeable corporate Ether treasuries. Together, these create deeper structural demand that did not exist in earlier cycles. As of Aug. 11, companies with crypto treasuries held more than $13 billion in Ether value, marking a significant on-chain accumulation trend.

Source: Satoshi Stacker

On-chain reporting and blockchain intelligence firms have highlighted large discretionary buys, and market intelligence shows institutional purchases continuing into August. For example, a firm reported that a chairman bought an additional $45 million worth of Ether, bringing a corporate stack to multi-billion levels.

When did spot Ether ETFs and inflows matter most this August?

Spot Ether ETFs attracted roughly $2.79 billion in net inflows during August, while spot Bitcoin ETFs saw approximately $1.2 billion in net outflows, per Farside data. That rotation coincided with a decline in Bitcoin dominance to about 58.19% over 30 days, signaling capital movement into broader crypto assets.

Industry voices noted a “notable shift” in ETF flows toward Ether, underscoring that ETF mechanics can meaningfully influence price discovery and liquidity, especially during seasonally vulnerable months.

‘,
‘

🔥 The Power of the TRON Ecosystem is Yours!
Click now to discover exclusive opportunities!

‘,
‘

💎 Profit Opportunities on the TRON Network
Join now to strengthen your investments!

‘
];

var adplace = document.getElementById(“ads-htx”);
if (adplace) {
var sessperindex = parseInt(sessionStorage.getItem(“adsindexHtx”));
var adsindex = isNaN(sessperindex) ? Math.floor(Math.random() * adscodesHtx.length) : sessperindex;
adplace.innerHTML = adscodesHtx[adsindex];
sessperindex = adsindex === adscodesHtx.length – 1 ? 0 : adsindex + 1;
sessionStorage.setItem(“adsindexHtx”, sessperindex);
}
})();