Ocean · sea level
Brest, two centuries of tides
The Brest tide gauge has measured sea level since 1807, one of the longest records in the world. Each ring is one year of PSMSL monthly means.
- Year
- —
- Mean level
- —
Brest, latest month
7,175 mm
Global mean sea level (altimetry)
83.6 mm
Period at Brest
1807 → 2025
PSMSL RLR monthly mean sea level, Brest (station 1) · Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · 10/23/26
Global mean sea level from satellite altimetry (NOAA STAR LSA) · U.S. Government work, public domain; acknowledge NOAA/NESDIS/STAR LSA altimetry · 10/23/26
Annual mean height of the Brest PSMSL RLR record; colour from blue (low) to red (high).
Latest altimetry value
83.6 mm
2025-02
anomaly, no isostatic correction
Global mean sea level from satellite altimetry (NOAA STAR LSA) · U.S. Government work, public domain; acknowledge NOAA/NESDIS/STAR LSA altimetry · 10/23/26
Brest, latest month
7,175 mm
2025-06
RLR height (≈ 7000 mm below mean level)
PSMSL RLR monthly mean sea level, Brest (station 1) · Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · 10/23/26
Honolulu, latest month
7,149 mm
2025-12
RLR height (≈ 7000 mm below mean level)
PSMSL RLR monthly mean sea level, Honolulu (station 155) · Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · 10/23/26
Marseille, latest month
7,044 mm
2025-06
RLR height (≈ 7000 mm below mean level)
PSMSL RLR monthly mean sea level, Marseille (station 61) · Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · 10/23/26
Global mean sea level from altimetry since 1993
Global mean sea level from satellite altimetry (NOAA STAR LSA) · U.S. Government work, public domain; acknowledge NOAA/NESDIS/STAR LSA altimetry · 10/23/26
Show the data as a table
Brest, Marseille and Honolulu tide gauges, yearly mean
PSMSL RLR monthly mean sea level, Brest (station 1) · Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · 10/23/26
PSMSL RLR monthly mean sea level, Marseille (station 61) · Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · 10/23/26
PSMSL RLR monthly mean sea level, Honolulu (station 155) · Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · 10/23/26
Show the data as a table
Brest, monthly level since 1990
PSMSL RLR monthly mean sea level, Brest (station 1) · Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · 10/23/26
Show the data as a table
Method and sources
Global mean sea level comes from satellite altimetry (TOPEX/Poseidon, Jason-1/2/3, Sentinel-6MF) processed by the NOAA STAR altimetry laboratory, about one value every ten days. Tide gauges come from PSMSL (Revised Local Reference): monthly heights in mm relative to a fixed datum per station, about 7000 mm below mean level.
Tide-gauge levels include vertical land motion; they are not corrected here.
Reading these data
Altimetry and tide gauges do not measure the same thing: a geocentric level for the first, a level relative to the coast for the second. Local trends differ from the global mean (≈ 3 mm/yr since 1993).
SOURCES OF THIS PAGE
- PSMSL RLR monthly mean sea level, Brest (station 1)
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Holgate, S. J., et al. (2013). New data systems and products at the Permanent Service for Mean Sea Level. Journal of Coastal Research, 29(3), 493–504. Data: PSMSL, Brest, RLR monthly.
· doi:10.2112/JCOASTRES-D-12-00175.1 · source page ↗
Licence : Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · retrieved on Oct 23, 2026 · SHA-256 ac740112080d… - Global mean sea level from satellite altimetry (NOAA STAR LSA)
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NOAA/NESDIS/STAR Laboratory for Satellite Altimetry, global mean sea level anomaly from TOPEX/Poseidon, Jason-1/2/3 and Sentinel-6MF (66°S–66°N, seasonal signals removed, no GIA correction).
· source page ↗
Licence : U.S. Government work, public domain; acknowledge NOAA/NESDIS/STAR LSA altimetry · retrieved on Oct 23, 2026 · SHA-256 539ecde7a3e9… - PSMSL RLR monthly mean sea level, Honolulu (station 155)
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Holgate, S. J., et al. (2013). New data systems and products at the Permanent Service for Mean Sea Level. Journal of Coastal Research, 29(3), 493–504. Data: PSMSL, Honolulu, RLR monthly.
· doi:10.2112/JCOASTRES-D-12-00175.1 · source page ↗
Licence : Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · retrieved on Oct 23, 2026 · SHA-256 8f9b9b6ec7bd… - PSMSL RLR monthly mean sea level, Marseille (station 61)
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Holgate, S. J., et al. (2013). New data systems and products at the Permanent Service for Mean Sea Level. Journal of Coastal Research, 29(3), 493–504. Data: PSMSL, Marseille, RLR monthly.
· doi:10.2112/JCOASTRES-D-12-00175.1 · source page ↗
Licence : Free for research and educational use with citation of PSMSL and Holgate et al. (2013) · retrieved on Oct 23, 2026 · SHA-256 0724de0867e9… - Holgate (2013)
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Holgate, S. J., et al. (2013). New data systems and products at the Permanent Service for Mean Sea Level. Journal of Coastal Research, 29(3), 493–504.
· doi:10.2112/JCOASTRES-D-12-00175.1
Licence : Published literature; cited