How warm is it in Tamarindo in August?

Daytime highs averaged 30.8 °C, night-time lows 25.0 °C. The highest value of the past 10 years was 35.6 °C (3 Aug 2026), the lowest 22.7 °C (4 Aug 2022).

How often does it rain in Tamarindo in August?

On average there were 21.5 rain days (at least 1 mm) with 206 mm of precipitation in total.

How warm is the sea in Tamarindo in August?

The sea temperature averaged 29.3 °C (open-sea point approx. 3 km from the town).

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Tamarindo weather in August: temperature & rain

Photo: Jarle Naustvik · CC BY 2.0

🇨🇷 Weather in Tamarindo in August

This is what the weather in Tamarindo (Guanacaste, Costa Rica) was like in August over the years 2017–2026.

Key facts at a glance

Prevailing weather: Rain

Avg. daytime high

30.8 °C

29.4 °C – 34.0 °C

Avg. night-time low

25.0 °C

24.2 °C – 26.0 °C

Avg. rain days in period

21.5

69 % of days · ≥ 1.0 mm

Avg. precipitation in period

206 mm

64.4 mm – 597 mm

Avg. cloud cover

79 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

29.3 °C

Sea measuring point approx. 3 km from the location

Extremes: Highest temperature 35.6 °C (3 Aug 2026) · Lowest temperature 22.7 °C (4 Aug 2022) · Avg. daily peak wind 16 km/h

Weather mix of all days

5Sunny
29Partly cloudy
45Cloudy
105Light rain
110Rain

Summary

On average 30.8 °C during the day and 25.0 °C at night.
On average 21.5 rain days (Rain day = at least 1.0 mm of precipitation) with 206 mm of precipitation in total.
The sea averaged 29.3 °C.
Prevailing weather: Rain.
Warmest year: 2026 (avg. 34.0 °C), coolest: 2020 (avg. 29.4 °C).
Wettest year: 2021 (597 mm), driest: 2026 (64.4 mm).
Extremes: 35.6 °C on 3 Aug 2026 and 22.7 °C on 4 Aug 2022.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max34.0°Avg. min26.0°
Rain days
15 Rain days
Precipitation
64.4 mm
Avg. cloud cover
–
Sea temperature
30.0 °C
Max 35.6 °C · Min 25.4 °C
2025
Avg. max30.5°Avg. min24.8°
Rain days
22 Rain days
Precipitation
123 mm
Avg. cloud cover
76 % cloudy
Sea temperature
29.3 °C
Max 31.9 °C · Min 23.7 °C
2024
Avg. max30.5°Avg. min25.4°
Rain days
23 Rain days
Precipitation
154 mm
Avg. cloud cover
80 % cloudy
Sea temperature
29.6 °C
Max 32.1 °C · Min 24.2 °C
2023
Avg. max32.6°Avg. min25.6°
Rain days
17 Rain days
Precipitation
106 mm
Avg. cloud cover
78 % cloudy
Sea temperature
30.2 °C
Max 35.5 °C · Min 23.0 °C
2022
Avg. max29.8°Avg. min24.2°
Rain days
23 Rain days
Precipitation
125 mm
Avg. cloud cover
79 % cloudy
Sea temperature
28.5 °C
Max 31.4 °C · Min 22.7 °C
2021
Avg. max29.5°Avg. min24.6°
Rain days
31 Rain days
Precipitation
597 mm
Avg. cloud cover
84 % cloudy
Sea temperature
28.8 °C
Max 31.6 °C · Min 23.3 °C
2020
Avg. max29.4°Avg. min24.7°
Rain days
25 Rain days
Precipitation
249 mm
Avg. cloud cover
80 % cloudy
Sea temperature
28.6 °C
Max 31.9 °C · Min 23.3 °C
2019
Avg. max31.7°Avg. min25.1°
Rain days
18 Rain days
Precipitation
131 mm
Avg. cloud cover
80 % cloudy
Sea temperature
29.4 °C
Max 33.7 °C · Min 23.9 °C
2018
Avg. max30.6°Avg. min24.6°
Rain days
18 Rain days
Precipitation
117 mm
Avg. cloud cover
80 % cloudy
Sea temperature
29.4 °C
Max 31.9 °C · Min 23.6 °C
2017
Avg. max29.7°Avg. min24.6°
Rain days
23 Rain days
Precipitation
398 mm
Avg. cloud cover
77 % cloudy
Sea temperature
29.2 °C
Max 31.4 °C · Min 23.9 °C

Frequently asked questions

How warm is it in Tamarindo in August?: Daytime highs averaged 30.8 °C, night-time lows 25.0 °C. The highest value of the past 10 years was 35.6 °C (3 Aug 2026), the lowest 22.7 °C (4 Aug 2022).
How often does it rain in Tamarindo in August?: On average there were 21.5 rain days (at least 1 mm) with 206 mm of precipitation in total.
How warm is the sea in Tamarindo in August?: The sea temperature averaged 29.3 °C (open-sea point approx. 3 km from the town).

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis); Sea measuring point approx. 3 km from the location (10.310, -85.860)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)