Costa Rica
Costa Rica in August: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Costa Rica in August is climatically mixed. The average daily high is around 31 °C, and the sea is about 29 °C. With about 22 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
51/100 · #10
Warmth
#7
Dryness
#9
Sun
#6
Sea warmth
#4
Published best categories: none
Costa Rica · AugustPhoto: Shiva Shenoy from Flower Mound, United States · CC BY 2.0Climate facts
- Average high
- 31 °C
- Average low
- 25 °C
- Sea
- 29 °C
- Rainy days (est.)
- 22 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 80 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| July | 31 | 25 | 21 | 153 | 6.2 | 80 | 2.4 | 29 | 52 |
| August (selected) | 31 | 25 | 22 | 189 | 6.2 | 80 | 2.1 | 29 | 51 |
| September | 30 | 25 | 26 | 270 | 6.1 | 83 | 1.9 | 29 | 52 |
How do the previous and next months compare?
Baseline: August (51/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| July | +1 | -0.1 °C | ±0 °C | -1.1 | -35.7 mm | ±0 h | +0.2 % | +0.3 m/s | -0.1 °C |
| September | +1 | -0.9 °C | -0.1 °C | +4.1 | +81 mm | -0.1 h | +3.3 % | -0.2 m/s | -0.1 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Costa Rica in August?
The average daily high is around 31 °C, with an average daily low of about 25 °C.
Can you swim in Costa Rica in August?
The sea is about 29 °C (very warm).
Does it rain a lot in Costa Rica in August?
The curated estimate is about 22 rainy days per month, not a directly measured long-term average. Total precipitation averages around 189 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Costa Rica?
By the climate score, January, February, March and December are the strongest months for Costa Rica. For a beach trip: January, February, November and December. August is not among them.