Offshore Stays

Surf Tamarindo in September

Surfing Tamarindo in September: in the main surf season, air around 27°C, sea around 29°C, 10.6 mm of rain a day on average. Wetsuit: boardshorts or a rash vest.

Surf season

In season

Air temperature

27°C

Sea temperature

29°C

Rain

10.6 mm/day

Wind

9 km/h avg

Average wave height

1.4 m (5 ft)

Big days (top 10%)

1.7 m (6 ft)+

Swell period

13 s

Main swell direction

From SSW (203°)

What to wear: with the sea around 29°C in September, expect boardshorts or a rash vest.

Surf size in Tamarindo in September

Offshore of Tamarindo, waves in September average 1.4 m (5 ft), above the year-round average of 1.3 m — the 2nd biggest month of the year. One hour in ten is 1.7 m (6 ft) or bigger. The dominant swell runs at about 13 seconds from the SSW.

These are open-ocean figures from 10 years of hourly wave data, not a beach forecast: a sheltered break will be smaller, an exposed reef or point can be bigger.

September in the context of Tamarindo's surf season

Tamarindo's main surf season runs May–November. September is inside it.

Full Tamarindo surf and remote-work guide →

Frequently asked questions

Is September a good month to surf Tamarindo?
Yes — September falls in Tamarindo's main surf season (May–November).
How warm is the sea in Tamarindo in September?
About 29°C on average, which calls for boardshorts or a rash vest.
What is the weather like in Tamarindo in September?
Air temperature averages 27°C, with about 10.6 mm of rain per day and average winds of 9 km/h.
Climate: NASA POWER (MERRA-2) monthly climatology, 2001–2020. Sea temperature: NOAA Coral Reef Watch CoralTemp v3.1, 5 km monthly SST, 2015–2025 mean (nearest ocean cell). Surf season is Offshore Stays editorial. Waves: Open-Meteo Marine API, ECMWF ERA5-Ocean hourly reanalysis, 2016–2025 (offshore grid cell 10.5°N 86.0°W), retrieved 22 Oct 2026.