The highest day temperature in January 2026 was 59°F. The lowest night temperature was 30°F. The average values for day and night temperatures during January were 49.8°F и 45.4°F respectivly.

The average sea surface temperature in January 2026 for Arcachon was 52.9°F. The maximum and minimum values were 52.0°F and 54.2°F respectively.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Arcachon is 2.9 in. It makes january one of the most rainy months of the year.

The average wind speed in January is 10.0 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Arcachon in January is 4.4 hours.