# Boston king tides and high water in 2026

> In 2026 (record through Sep 30, 2026), NOAA's Boston tide gauge recorded water high enough for FloodRoute's model to put at least one Boston road at risk on 39 days. The highest was 12.80 ft on Tuesday, June 16, 2026, 0.82 ft above the tide tables, with 16 roads at risk, including Chelsea Street, William T. Morrissey Boulevard and Marginal Street.

**Estimates, not records of actual flooding.** Each day is NOAA's verified high water at the tide gauge, run through FloodRoute's flood model on today's roads and elevations, in dry weather. Drains, levees, tide gates, rain, road changes and elevation error all mean real conditions differed. Not for property, real-estate, insurance, lending, engineering or legal decisions.

## Every day with roads at risk (39)

| Date | High water (Boston gauge, ft MLLW) | vs tide tables | Roads at risk | Severity | Deepest streets (model) |
|---|---|---|---|---|---|
| Jan 1, 2026 | 12.17 | +1.15 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jan 3, 2026 | 12.24 | +0.74 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jan 4, 2026 | 12.43 | +0.94 ft | 8 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jan 5, 2026 | 11.94 | +0.65 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jan 6, 2026 | 11.99 | +1.06 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jan 7, 2026 | 11.78 | +1.38 ft | 2 | Possible | Chelsea Street |
| Feb 1, 2026 | 12.51 | +1.51 ft | 10 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Feb 2, 2026 | 12.52 | +1.47 ft | 10 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Feb 3, 2026 | 11.84 | +0.94 ft | 2 | Possible | Chelsea Street |
| Feb 23, 2026 | 12.42 | +2.05 ft | 8 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 23, 2026 | 12.07 | +1.03 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Mar 24, 2026 | 12.03 | +1.27 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 18, 2026 | 11.97 | +0.59 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 19, 2026 | 12.56 | +0.92 ft | 10 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 20, 2026 | 11.86 | +0.21 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Apr 21, 2026 | 11.79 | +0.35 ft | 2 | Possible | Chelsea Street |
| May 16, 2026 | 11.84 | +0.02 ft | 2 | Possible | Chelsea Street |
| May 18, 2026 | 12.17 | +0.20 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 19, 2026 | 12.15 | +0.25 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| May 20, 2026 | 11.91 | +0.29 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 12, 2026 | 12.02 | +0.85 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 13, 2026 | 12.35 | +0.75 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 14, 2026 | 12.69 | +0.80 ft | 14 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 16, 2026 | 12.80 | +0.82 ft | 16 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 17, 2026 | 12.68 | +0.79 ft | 14 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 18, 2026 | 12.42 | +0.81 ft | 8 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jun 19, 2026 | 12.19 | +1.01 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jul 12, 2026 | 12.01 | +0.59 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jul 13, 2026 | 12.18 | +0.52 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jul 14, 2026 | 12.54 | +0.78 ft | 10 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jul 16, 2026 | 12.59 | +0.91 ft | 12 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Jul 17, 2026 | 12.08 | +0.66 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Aug 10, 2026 | 11.99 | +0.93 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Aug 11, 2026 | 12.35 | +1.06 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Aug 12, 2026 | 12.29 | +0.90 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Aug 14, 2026 | 12.16 | +0.85 ft | 5 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 27, 2026 | 12.27 | +1.66 ft | 6 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 28, 2026 | 12.45 | +1.53 ft | 8 | Likely | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |
| Sep 29, 2026 | 11.96 | +0.86 ft | 4 | Possible | Chelsea Street, William T. Morrissey Boulevard, Marginal Street |

[All Boston history](https://floodroute.com/ma/boston/history.md) · [Live forecast](https://floodroute.com/ma/boston.md)

Data: [CSV](https://floodroute.com/data/history/ma/boston.csv) · [JSON](https://floodroute.com/data/history/ma/boston.json) · Open Database License (ODbL) 1.0 (https://opendatacommons.org/licenses/odbl/1-0/) · Credit: FloodRoute (floodroute.com), © OpenStreetMap contributors, NOAA CO-OPS · [All towns](https://floodroute.com/data.md)

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