Ethereum in September: seasonality and history
Since 2015, Ethereum has risen in September in 42% of years (5 of 12), with an average return of −8.58% and a median of −9.07%. That makes September its #11 month of 12.
Average−8.58%
Years up42%
Best year2016 · +14.24%
Worst year2015 · −45.38%
The seasonal path through September
Cumulative sum of each day's average return through September, all years since 2015.
| Strongest days | Avg | Up |
|---|---|---|
| Sep 12 | +3.27% | 75% |
| Sep 1 | +2.37% | 58% |
| Sep 26 | +1.77% | 67% |
| Weakest days | Avg | Up |
|---|---|---|
| Sep 24 | −3.19% | 25% |
| Sep 11 | −2.59% | 33% |
| Sep 13 | −2.37% | 42% |
Seasonal trend windows touching September
- ▼ Bearish Sep 21 – Sep 25 · 5 days · seasonal Σ −7.44%
September in recent years
| Year | Ethereum in September |
|---|---|
| 2026 | +8.79% |
| 2025 | −5.56% |
| 2024 | +3.57% |
| 2023 | +1.55% |
| 2022 | −14.53% |
| 2021 | −12.58% |
| 2020 | −17.27% |
| 2019 | +4.29% |
| 2018 | −17.72% |
| 2017 | −22.38% |
Questions
Is September a bad month for Ethereum?
On average, yes: −8.58% since 2015, rising in 42% of years. But the range is wide, from −45.38% in 2015 to +14.24% in 2016, so an average is a tendency, not a forecast.
What are the strongest days in September?
Sep 12 (+3.27%, up 75% of years), Sep 1 (+2.37%, up 58% of years), Sep 26 (+1.77%, up 67% of years).