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NOAA Tides and Water Levels — Official US Observations

Under maintenance

Try for free

Tide and water level readings from NOAA stations as flat rows — time, value, sigma and quality flags. Free public API, no key.

Pricing

from $0.50 / 1,000 results

Rating

0.0

(0)

Developer

alaudin burki

Actor stats

Bookmarked

Total users

Monthly active users

6 hours ago

Last modified

What you get

time, value, sigma, flags, quality.

Sample output

{ "time": "2026-10-18 02:00", "value": "1.234", "sigma": "0.012", "quality": "v" }

Limitations

date: "latest" returns ONE row — the most recent reading. Use today, or a range like 20261001-20261007, for a series.
value is a string, as NOAA publishes it, and the unit depends on your units choice (metric or english). It is not converted.
quality is NOAA's own flag (v verified, p preliminary) — a preliminary reading can be revised later.
Tide predictions and observations are different products. water_level is measured; predictions is astronomical and cannot see a storm surge.
US stations only.

Pricing

Pay per result.

Fields

Field	Type	What it holds
`time`	string	Time this row refers to.
`value`	number	The measured value for this row. Units are in the README and sometimes in a sibling field.
`sigma`	string	Standard deviation of the height prediction, in the source's units. A measure of how uncertain the tide forecast is, not of the tide itself.
`flags`	string	Quality or status flags the source sets on the observation, in its own coding.
`quality`	string	Quality flag from the source. For a postcode this is 1 for a real one and lower for an approximate or terminated one.

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