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🇨🇷 Weather in Tamarindo in September
This is what the weather in Tamarindo (Guanacaste, Costa Rica) was like in September over the years 2017–2026.
Key facts at a glance
Prevailing weather: Rain
Avg. daytime high
30.5 °C
29.0 °C – 33.8 °C
Avg. night-time low
25.0 °C
24.5 °C – 25.9 °C
Avg. rain days in period
26.8
89 % of days · ≥ 1.0 mm
Avg. precipitation in period
302 mm
141 mm – 508 mm
Avg. cloud cover
83 %
This data source has no sunshine hours – average cloud cover is shown instead.
Avg. sea temperature
29.2 °C
Sea measuring point approx. 3 km from the location
Extremes: Highest temperature 35.9 °C (23 Sep 2023) · Lowest temperature 23.4 °C (1 Sep 2021) · Avg. daily peak wind 13 km/h
Weather mix of all days
- 7Partly cloudy
- 16Cloudy
- 97Light rain
- 171Rain
Summary
- On average 30.5 °C during the day and 25.0 °C at night.
- On average 26.8 rain days (Rain day = at least 1.0 mm of precipitation) with 302 mm of precipitation in total.
- The sea averaged 29.2 °C.
- Prevailing weather: Rain.
- Warmest year: 2023 (avg. 33.8 °C), coolest: 2022 (avg. 29.0 °C).
- Wettest year: 2020 (508 mm), driest: 2023 (141 mm).
- Extremes: 35.9 °C on 23 Sep 2023 and 23.4 °C on 1 Sep 2021.
Overall values from all 10 years. How is this calculated?
Charts
Temperatures per year
Average over your travel period
Avg. daytime high: 2017 29°, 2018 31°, 2019 31°, 2020 29°, 2021 29°, 2022 29°, 2023 34°, 2024 30°, 2025 30°, 2026 33°. Avg. night-time low: 2017 25°, 2018 25°, 2019 25°, 2020 25°, 2021 25°, 2022 25°, 2023 26°, 2024 25°, 2025 25°, 2026 26°. Sea temperature: 2017 29°, 2018 29°, 2019 29°, 2020 28°, 2021 29°, 2022 29°, 2023 30°, 2024 29°, 2025 29°, 2026 30°.
Precipitation & rain days
Precipitation (mm): 2017 307, 2018 161, 2019 221, 2020 508, 2021 497, 2022 224, 2023 141, 2024 377, 2025 328, 2026 253.
Year by year
2026
Avg. max32.6°Avg. min25.9°- Rain days
- 21 Rain days
- Precipitation
- 253 mm
- Avg. cloud cover
- –
- Sea temperature
- 30.5 °C
Max 35.4 °C · Min 24.7 °C
2025
Avg. max30.0°Avg. min25.0°- Rain days
- 28 Rain days
- Precipitation
- 328 mm
- Avg. cloud cover
- 86 % cloudy
- Sea temperature
- 28.8 °C
Max 31.6 °C · Min 23.9 °C
2024
Avg. max29.8°Avg. min25.3°- Rain days
- 29 Rain days
- Precipitation
- 377 mm
- Avg. cloud cover
- 88 % cloudy
- Sea temperature
- 29.2 °C
Max 32.4 °C · Min 23.9 °C
2023
Avg. max33.8°Avg. min25.8°- Rain days
- 20 Rain days
- Precipitation
- 141 mm
- Avg. cloud cover
- 76 % cloudy
- Sea temperature
- 30.3 °C
Max 35.9 °C · Min 23.6 °C
2022
Avg. max29.0°Avg. min24.6°- Rain days
- 27 Rain days
- Precipitation
- 224 mm
- Avg. cloud cover
- 88 % cloudy
- Sea temperature
- 28.8 °C
Max 31.7 °C · Min 23.8 °C
2021
Avg. max29.5°Avg. min24.5°- Rain days
- 27 Rain days
- Precipitation
- 497 mm
- Avg. cloud cover
- 79 % cloudy
- Sea temperature
- 28.6 °C
Max 31.2 °C · Min 23.4 °C
2020
Avg. max29.5°Avg. min24.6°- Rain days
- 29 Rain days
- Precipitation
- 508 mm
- Avg. cloud cover
- 79 % cloudy
- Sea temperature
- 28.3 °C
Max 30.8 °C · Min 23.8 °C
2019
Avg. max30.6°Avg. min24.9°- Rain days
- 28 Rain days
- Precipitation
- 221 mm
- Avg. cloud cover
- 84 % cloudy
- Sea temperature
- 28.9 °C
Max 33.5 °C · Min 24.1 °C
2018
Avg. max30.7°Avg. min24.8°- Rain days
- 29 Rain days
- Precipitation
- 161 mm
- Avg. cloud cover
- 81 % cloudy
- Sea temperature
- 29.4 °C
Max 32.5 °C · Min 23.4 °C
2017
Avg. max29.2°Avg. min24.8°- Rain days
- 30 Rain days
- Precipitation
- 307 mm
- Avg. cloud cover
- 85 % cloudy
- Sea temperature
- 29.1 °C
Max 30.9 °C · Min 24.2 °C
Frequently asked questions
- How warm is it in Tamarindo in September?
- Daytime highs averaged 30.5 °C, night-time lows 25.0 °C. The highest value of the past 10 years was 35.9 °C (23 Sep 2023), the lowest 23.4 °C (1 Sep 2021).
- How often does it rain in Tamarindo in September?
- On average there were 26.8 rain days (at least 1 mm) with 302 mm of precipitation in total.
- How warm is the sea in Tamarindo in September?
- The sea temperature averaged 29.2 °C (open-sea point approx. 3 km from the town).
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Other destinations in September
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)