Last updated: August 21, 2025
In August, San Jose, Costa Rica experiences a warm tropical climate characterized by an average temperature of 25°C (77°F), peaking at a maximum of 29°C (85°F) and dipping to a minimum of 22°C (72°F). This month is marked by high humidity at 82%, contributing to the city's lush green surroundings. However, be prepared for significant rainfall, as 286 mm (11.2 in) of precipitation falls throughout the month, with rain occurring on 30 days. Travelers can expect the vibrant atmosphere of the city paired with delightful warmth, punctuated by the sounds of tropical rain.
In August, San Jose, Costa Rica, experiences a pleasant and temperate climate, with temperatures that typically range from a minimum of 22°C (72°F) to a comfortable maximum of 29°C (85°F). The average temperature hovers around 25°C (77°F), reflecting a consistent warmth that characterizes much of Central America during this month. Compared to the preceding months, August shows a slight increase in nighttime temperatures, corresponding with an overall trend of warmth that builds throughout the year. Despite the mild weather, it retains a refreshing quality, offering a delightful escape from the sweltering heat common in many other regions during summer. This month serves as a perfect time to explore the lush landscapes and vibrant culture of this captivating city.
In August, San Jose, Costa Rica experiences considerable rainfall, with an average precipitation of 286 mm (11.2 in) falling over 30 days. As part of the city's rainy season, this month aligns closely with the preceding July, which recorded 270 mm (10.6 in), maintaining a trend of abundant moisture. This persistent pattern signifies that visitors should be prepared for frequent showers while enjoying the lush, vibrant landscapes that characterize this beautiful country during its wettest months. The precipitation amounts gradually build into September, where 272 mm (10.7 in) is typical, underscoring the reliability of this seasonal downpour that nourishes the local flora and fauna.
August in San Jose, Costa Rica, sees a noticeable shift in humidity levels, with an average of 82% marking the month as one of the more humid times of the year. Following July's peak at 85%, the humidity begins to gradually decline, paving the way for a slight relief as September approaches, where levels drop to 80%. The trend throughout the year showcases a distinct seasonal pattern: humidity is generally lower in the initial months, ranging from 63% to 66%, before climbing to a mid-year high in the wetter seasons of June and July. As the year progresses, San Jose experiences the sultry embrace of the tropical climate, but August remains a month where humidity lingers in the air, creating a lush atmosphere typical of this vibrant locale.
In August, the UV Index in San Jose, Costa Rica, registers at 13, maintaining its status in the extreme exposure category, just a notch below the peak levels observed in the previous months. With a burn time of only 10 minutes, this persistent high level of UV radiation emphasizes the need for sun protection during this time. Remarkably, from January through August, the UV Index has largely hovered around the 14 mark, reflecting a consistent pattern of intense solar exposure throughout the dry season. As September approaches, the UV Index remains steady at 13, highlighting the continued need for vigilance against the sun’s rays. For more insights on UV levels throughout the year, check out San Jose UV Index.
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August in San Jose, Costa Rica, brings a delightful balance of vibrant sunshine and refreshing breezes, boasting 293 hours of glorious daylight. This month mirrors the sunny disposition established through the heart of the year, where the sun graces the city with its presence in June and May at the same count. Following the peak sunshine of March with 332 hours, the trend of abundant daylight gently wanes into the fall, yet August retains a warmth that invites outdoor adventures and exploration. As the year progresses towards its close, the hours gradually decline, but the enchanting allure of San Jose remains steadfast, promising sunny days until the very end.
In August, San Jose, Costa Rica, experiences a significant dip in sunshine, with only a 9% chance of sunny weather, making it one of the cloudiest months of the year. This trend follows a consistent decline from the relatively sunnier months of January through April, where chances of sun hover between 29% and 51%. As the rainy season intensifies through May and June, the likelihood of clear skies plummets, culminating in the grayness of August. With such limited sunshine, travelers looking for bright days might want to consider alternate months, especially as the sun starts to reemerge again in October.
In August, San Jose, Costa Rica enjoys a delightful average of 12 hours of daylight—consistent with the preceding months from March through July. This continuity in daylight duration creates a vibrant atmosphere, allowing residents and visitors alike to bask in the warm glow of tropical sunlight. As summer transitions to fall, the daylight begins to ebb slightly, returning to 11 hours in October. However, August stands out as part of a period where longer days reign supreme, making it a perfect time for outdoor adventures and exploration in this beautiful Central American city. The gradual change in daylight highlights the rhythmic dance of the seasons, offering a charming predictability that complements the lush landscape of Costa Rica.
As August settles over San Jose, Costa Rica, the wind takes on a notably gentle character, with average speeds dropping to 3.0 m/s (7 mph). This month marks a continuation of a trend seen since the peak winds of March, where gusts averaged 5.7 m/s (13 mph), showcasing a gradual decline as the region shifts into the heart of the rainy season. Following July’s consistent 4.5 m/s (10 mph) breezes, August's winds whisper softness, complementing the lush surroundings that come alive with vibrant greenery. As the year progresses towards the cooler months, September mirrors August's calm winds, suggesting a period of tranquility in the air before conditions shift once more with the return of stronger breezes in November.
Weather in San Jose varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in San Jose, focusing on differences in temperature, rainfall, humidity, and UV levels.
August and January exhibit notable differences in weather patterns. In August, temperatures range from a minimum of 22°C (72°F) to a maximum of 29°C (85°F), creating a warm and humid environment with an average temperature of 25°C (77°F). This month also experiences significant rainfall, totaling 286 mm (11.2 in) over 30 days, contributing to a high humidity level of 82%. In contrast, January features slightly cooler temperatures, with a minimum of 20°C (68°F) and a maximum of 27°C (82°F), averaging 24°C (75°F). Rainfall is significantly reduced in January, with only 148 mm (5.8 in) over 22 days and lower humidity at 66%. For more detailed information on January weather, visit San Jose weather in January.
When comparing the weather in August and February, August tends to be hotter and much more humid. In August, temperatures range from a minimum of 22°C (72°F) to a maximum of 29°C (85°F), with an average of 25°C (77°F). The month is characterized by significant rainfall, receiving 286 mm (11.2 inches) over 30 days and a high humidity of 82%. In contrast, February has slightly milder temperatures, with a minimum of 20°C (68°F), an average of 24°C (76°F), and a maximum of 28°C (83°F). Additionally, February experiences much less precipitation, totaling only 96 mm (3.8 inches) over 20 days, and a lower humidity level of 64%. For more specific information on February weather patterns, you can visit San Jose weather in February.
August and March exhibit distinct weather patterns. While both months have similar minimum temperatures—August at 22°C (72°F) and March at 21°C (69°F)—August tends to be slightly warmer overall, with an average of 25°C (77°F) compared to March's 24°C (76°F). Humidity is notably higher in August at 82%, making it feel more oppressive, while March offers a more comfortable level at 63%. Precipitation is considerably more intense in August, with 286 mm (11.2 in) of rain over 30 days, versus March's 102 mm (4.0 in) across 23 days of rain. For more details on weather conditions during March, you can check San Jose weather in March.
In comparing the weather between August and April, we see noteworthy differences. August tends to be more humid, with an average humidity of 82%, while April has a more comfortable humidity level of 63%. Although both months have a similar minimum temperature of around 22°C (72°F), April enjoys slightly warmer average and maximum temperatures, reaching up to 30°C (87°F), compared to August's max of 29°C (85°F). Additionally, August experiences significantly more rainfall, with 286 mm (11.2 in) spread over 30 days, whereas April has much lighter precipitation of 75 mm (2.9 in) over just 19 days. For more details about the weather in April, check out San Jose weather in April.
When comparing the weather in August and May, we notice several key differences. In August, temperatures range from a minimum of 22°C (72°F) to an average of 25°C (77°F) and reach a maximum of 29°C (85°F), with high humidity at 82%. Precipitation is significant, totaling 286 mm (11.2 in) over 30 days. In contrast, May features slightly warmer temperatures, with a minimum of 22°C (73°F) and an average of 26°C (78°F) peaking at 30°C (85°F). However, May experiences even higher rainfall, accumulating 297 mm (11.7 in) across 28 days, but with lower humidity at 63%. For a detailed look at the weather patterns, you can check San Jose weather in May.
In comparing the weather of August and June, both months exhibit similar average temperatures, ranging from a minimum of 22°C (72°F) to a maximum of 29°C (85°F). However, June tends to have a slightly higher minimum temperature of 23°C (73°F) compared to August. Precipitation is notably heavier in June, with 337 mm (13.3 in) falling over 30 days, whereas August sees 286 mm (11.2 in) during the same number of days. Additionally, humidity levels are higher in August at 82%, compared to June's 74%, creating a more muggy atmosphere by late summer. For more details, you can check San Jose weather in June.
In comparing the weather between August and July, both months experienced similar average temperatures, with minimums of 22°C (72°F) and averages around 25°C (77°F). However, August saw slightly higher maximum temperatures at 29°C (85°F), compared to July's 28°C (84°F). Precipitation levels increased in August, reaching 286 mm (11.2 in) over 30 days, while July recorded 270 mm (10.6 in) under the same duration. Humidity was also marginally lower in August at 82% compared to July's humidity level of 85%. For more details, check out San Jose weather in July.
August and September exhibit quite similar weather patterns, with little variation in temperature and humidity. Both months maintain a minimum temperature of around 22°C (72°F), an average of 25°C (77°F), and a maximum of 29°C (85°F for August and 84°F for September). However, August tends to be slightly wetter, receiving 286 mm (11.2 in) of precipitation over 30 days, compared to September's 272 mm (10.7 in) over 29 days. The humidity is also marginally higher in August at 82%, while September sees a slight decrease to 80%. For more detailed weather insights, visit San Jose weather in September.
In comparing the weather of August and October, both months experience similar temperature ranges, with minimums at 22°C (72°F) and averages around 25°C (77°F). However, August tends to be slightly warmer, peaking at 29°C (85°F) compared to October's maximum of 28°C (83°F). Precipitation is notably higher in October, with 387 mm (15.2 in) falling over 28 days, compared to 286 mm (11.2 in) over 30 days in August. Humidity levels remain high in both months, though October is marginally lower at 79%, compared to August's 82%. For a more detailed look, you can visit San Jose weather in October.
August tends to be hotter and more humid compared to November, with average temperatures peaking at 25°C (77°F) and maximums reaching 29°C (85°F). The month experiences significant rainfall, accumulating around 286 mm (11.2 in) over 30 days, leading to a high humidity level of 82%. In contrast, November offers a slight decrease in temperature, averaging 24°C (76°F) with maximums of 28°C (82°F). However, it sees an increase in precipitation, totaling 306 mm (12.0 in) over 28 days, resulting in a slightly lower humidity of 79%. For more detailed information on the weather in November, you can visit San Jose weather in November.
August and December in San Jose feature relatively similar temperatures, with August slightly warmer, exhibiting a minimum of 22°C (72°F) and an average of 25°C (77°F), compared to December's minimum of 20°C (69°F) and average of 24°C (75°F). However, August experiences significantly higher precipitation, with 286 mm (11.2 in) over 30 days, compared to December’s 212 mm (8.3 in) across 27 days. Additionally, August has a higher humidity level at 82%, while December is more comfortable at 70%. For more detailed information, you can explore San Jose weather in December.
August in San Jose presents a unique blend of warm temperatures and high humidity, making it distinctly different from the other months. With an average temperature hovering around 25°C and frequent rainfall throughout the month, visitors can expect a lush, vibrant landscape. The 286 mm of precipitation over 30 days creates a muggy atmosphere, ideal for experiencing the rich biodiversity of the region. While other months might offer a drier climate, August’s persistent rain and warmth invite adventure amidst the greenery. To learn more about the overall climate patterns, visit San Jose Climate.