How warm is it in Tamarindo in December?

Daytime highs averaged 30.0 °C, night-time lows 23.3 °C. The highest value of the past 10 years was 33.8 °C (31 Dec 2021), the lowest 20.5 °C (13 Dec 2017).

How often does it rain in Tamarindo in December?

On average there were 5.2 rain days (at least 1 mm) with 27.3 mm of precipitation in total.

How warm is the sea in Tamarindo in December?

The sea temperature averaged 28.0 °C (open-sea point approx. 3 km from the town).

Holiday Weather Rewind

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Tamarindo weather in December: temperature & rain

Photo: Jarle Naustvik · CC BY 2.0

🇨🇷 Weather in Tamarindo in December

This is what the weather in Tamarindo (Guanacaste, Costa Rica) was like in December over the years 2016–2025.

Key facts at a glance

Prevailing weather: Sunny

Avg. daytime high

30.0 °C

28.7 °C – 31.6 °C

Avg. night-time low

23.3 °C

22.6 °C – 24.2 °C

Avg. rain days in period

5.2

17 % of days · ≥ 1.0 mm

Avg. precipitation in period

27.3 mm

4.4 mm – 85.7 mm

Avg. cloud cover

40 %

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

Avg. sea temperature

28.0 °C

Sea temperature available for 4 of 10 years.

Extremes: Highest temperature 33.8 °C (31 Dec 2021) · Lowest temperature 20.5 °C (13 Dec 2017) · Avg. daily peak wind 22 km/h

Weather mix of all days

132Sunny
97Partly cloudy
29Cloudy
42Light rain
10Rain

Summary

On average 30.0 °C during the day and 23.3 °C at night.
On average 5.2 rain days (Rain day = at least 1.0 mm of precipitation) with 27.3 mm of precipitation in total.
The sea averaged 28.0 °C.
Prevailing weather: Sunny.
Warmest year: 2018 (avg. 31.6 °C), coolest: 2016 (avg. 28.7 °C).
Wettest year: 2016 (85.7 mm), driest: 2021 (4.4 mm).
Extremes: 33.8 °C on 31 Dec 2021 and 20.5 °C on 13 Dec 2017.

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

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2025
Avg. max30.2°Avg. min23.2°
Rain days
6 Rain days
Precipitation
22.9 mm
Avg. cloud cover
40 % cloudy
Sea temperature
28.4 °C
Max 31.8 °C · Min 22.0 °C
2024
Avg. max29.3°Avg. min23.7°
Rain days
9 Rain days
Precipitation
64.2 mm
Avg. cloud cover
62 % cloudy
Sea temperature
27.9 °C
Max 30.7 °C · Min 22.0 °C
2023
Avg. max30.9°Avg. min24.2°
Rain days
4 Rain days
Precipitation
16.9 mm
Avg. cloud cover
36 % cloudy
Sea temperature
–
Max 32.8 °C · Min 21.5 °C
2022
Avg. max29.5°Avg. min22.6°
Rain days
2 Rain days
Precipitation
6.7 mm
Avg. cloud cover
27 % cloudy
Sea temperature
27.7 °C
Max 31.1 °C · Min 21.2 °C
2021
Avg. max31.3°Avg. min23.4°
Rain days
2 Rain days
Precipitation
4.4 mm
Avg. cloud cover
33 % cloudy
Sea temperature
28.0 °C
Max 33.8 °C · Min 22.4 °C
2020
Avg. max28.9°Avg. min22.6°
Rain days
7 Rain days
Precipitation
39.6 mm
Avg. cloud cover
39 % cloudy
Sea temperature
–
Max 30.0 °C · Min 21.2 °C
2019
Avg. max30.4°Avg. min23.7°
Rain days
5 Rain days
Precipitation
11.9 mm
Avg. cloud cover
51 % cloudy
Sea temperature
–
Max 32.3 °C · Min 22.6 °C
2018
Avg. max31.6°Avg. min23.2°
Rain days
2 Rain days
Precipitation
6.2 mm
Avg. cloud cover
27 % cloudy
Sea temperature
–
Max 33.4 °C · Min 21.8 °C
2017
Avg. max29.5°Avg. min22.7°
Rain days
3 Rain days
Precipitation
14.6 mm
Avg. cloud cover
40 % cloudy
Sea temperature
–
Max 31.1 °C · Min 20.5 °C
2016
Avg. max28.7°Avg. min23.2°
Rain days
12 Rain days
Precipitation
85.7 mm
Avg. cloud cover
51 % cloudy
Sea temperature
–
Max 29.8 °C · Min 21.7 °C

Frequently asked questions

How warm is it in Tamarindo in December?: Daytime highs averaged 30.0 °C, night-time lows 23.3 °C. The highest value of the past 10 years was 33.8 °C (31 Dec 2021), the lowest 20.5 °C (13 Dec 2017).
How often does it rain in Tamarindo in December?: On average there were 5.2 rain days (at least 1 mm) with 27.3 mm of precipitation in total.
How warm is the sea in Tamarindo in December?: The sea temperature averaged 28.0 °C (open-sea point approx. 3 km from the town).

Check your exact travel dates

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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)