France · Somme
Sea temperature at Onival
Warm and pleasant for swimming
Sample dataUpdated hourly from the live marine forecast. See the 12-month typical range and, where available, real measured readings further down the page.
7-day outlook
Sample dataModeled placeholder forecast for demonstration — will be replaced by a live marine-weather feed.
Sea temperature
Next 7 days, °C
View as table
| Day | Sea temp (°C) |
|---|---|
| Wed 2 | 26.9 |
| Thu 3 | 26.8 |
| Fri 4 | 26.3 |
| Sat 5 | 25.8 |
| Sun 6 | 25.8 |
| Mon 7 | 26.2 |
| Tue 8 | 26.7 |
Sea temperature by month
Modeled climatology derived from latitude and season.
Typical vs. measured sea temperature
12-month view, °C — modeled line vs. measured sample averages
View as table
| Month | Modeled (°C) | Measured avg. (°C) |
|---|---|---|
| Jan | 14 | — |
| Feb | 13 | — |
| Mar | 14 | — |
| Apr | 16 | — |
| May | 19 | — |
| Jun | 22 | — |
| Jul | 24 | — |
| Aug | 25 | — |
| Sep | 24 | — |
| Oct | 22 | — |
| Nov | 19 | — |
| Dec | 16 | — |
No measured in-season sea temperature has been published for Onival yet — the chart above shows the modeled climatology only. Some countries (Croatia, via IZOR) also record the sea temperature at each official water sample; check the water quality page for this beach's sampling status.
Frequently asked questions
Is the sea warm at Onival today?
That ~26°C figure is a placeholder, not a live reading — Onival's marine feed couldn't be reached, and it'll be swapped for the real value automatically once it responds again. That's the reading right off Somme.
What's the ideal time of year to swim at Onival?
For water above the comfortably-warm 22°C mark, target June–October — August is typically the high point of that window on the modeled curve. That applies to the water around Somme.
Is the sea temperature chart above measured or estimated?
Estimated, not measured, for Onival: the chart above models from latitude and season. Some national authorities (Croatia, via IZOR) additionally publish the sea temperature at each official sample, shown alongside the modeled curve when that data exists.