US Treasury rates, September 2026

Zero rates at all 10 fitted maturities on each of 7 trading days this month. Zero rates, not par yields: these discount a single cashflow, and the par yield for the same day is on that day's own page.

4.2%4.4%4.6%4.8%5.0%5.2%5.4%Sep 1, 2026Sep 10, 2026Sep 1, 20262Y zero rate4.368%10Y zero rate4.805%30Y zero rate5.309%Sep 2, 20262Y zero rate4.358%10Y zero rate4.803%30Y zero rate5.309%Sep 3, 20262Y zero rate4.313%10Y zero rate4.776%30Y zero rate5.289%Sep 4, 20262Y zero rate4.351%10Y zero rate4.786%30Y zero rate5.276%Sep 8, 20262Y zero rate4.366%10Y zero rate4.802%30Y zero rate5.284%Sep 9, 20262Y zero rate4.396%10Y zero rate4.831%30Y zero rate5.309%Sep 10, 20262Y zero rate4.533%10Y zero rate4.953%30Y zero rate5.380%
2Y zero rate10Y zero rate30Y zero rate
Zero rate first, last, low and high for each charted tenor across September 2026.
TenorFirstLastChangeLowHigh
2Y4.368%4.533%+16.6 bp4.313%Sep 3, 20264.533%Sep 10, 2026
10Y4.805%4.953%+14.8 bp4.776%Sep 3, 20264.953%Sep 10, 2026
30Y5.309%5.380%+7.0 bp5.276%Sep 4, 20265.380%Sep 10, 2026

Rates are percent; the change column is basis points. A rise in yield is a fall in price, so the colours here describe the rate rather than a bondholder's return.

Every trading day

Zero rate at each of the 10 fitted maturities, for every fitted trading day in September 2026.
Date1Y2Y3Y5Y7Y10Y15Y20Y25Y30Y
Sep 1, 20264.191%4.368%4.445%4.515%4.603%4.805%5.166%5.383%5.420%5.309%
Sep 2, 20264.179%4.358%4.438%4.512%4.601%4.803%5.165%5.384%5.421%5.309%
Sep 3, 20264.135%4.313%4.398%4.482%4.574%4.776%5.139%5.362%5.403%5.289%
Sep 4, 20264.170%4.351%4.435%4.511%4.594%4.786%5.139%5.357%5.393%5.276%
Sep 8, 20264.171%4.366%4.455%4.533%4.614%4.802%5.151%5.367%5.402%5.284%
Sep 9, 20264.194%4.396%4.492%4.575%4.653%4.831%5.171%5.387%5.426%5.309%
Sep 10, 20264.301%4.533%4.633%4.706%4.776%4.953%5.286%5.484%5.505%5.380%

Index levels before September 30, 2026 are back-tested. They were computed after the fact by applying the rules to historical data, which benefits from hindsight in the choice of rules, and an index cannot be invested in directly. Methodology v1.0 takes effect at that rebalance, when levels begin to be struck on the day; the rulebook is identical either way, and the version is published on every row.

A fitted curve is a fit, not a quote. Daily error averages 3.8 basis points across the history and reaches about 20 on the worst days, in December 2008, when the market was genuinely hard to fit one smooth curve to. Every curve page publishes its own fit error rather than burying it.

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Curves are fitted from public Treasury data and carry fit error; figures are not a record of trading, and an index cannot be invested in directly. No claim of compliance with the IOSCO Principles for Financial Benchmarks is made or implied. Not investment advice, not an offer, and not a recommendation to buy or sell any security.