Last updated: August 21, 2025
In September, Turrialba, Costa Rica experiences a lush and vibrant climate characterized by mild temperatures and frequent rain. With a maximum temperature reaching 26°C (79°F) and an average of 19°C (67°F), the weather remains comfortably cool. Nights can dip to a refreshing 15°C (59°F). However, this month is marked by significant rainfall, totaling 284 mm (11.2 in) over the course of 29 days, making it one of the wettest periods of the year. This high humidity level of 81% contributes to the area's rich biodiversity and thriving landscapes, ideal for those looking to embrace the beauty of Costa Rica's rainy season.
In September, Turrialba, Costa Rica, experiences mild temperatures that reflect the transition into the heart of the rainy season. With minimums hovering around 15°C (59°F) and maximums reaching up to 26°C (79°F), the climate remains comfortably cool. The average temperature stays steady at 19°C (67°F), mirroring the trends noted in the preceding months of July and August. This consistent warmth, coupled with the lush greenery brought by the rains, creates an inviting atmosphere for both locals and visitors. As the month progresses, expect more frequent showers, further enriching the landscape and enhancing the vibrant natural beauty of this charming region.
September in Turrialba, Costa Rica, typically sees a significant precipitation total of 284 mm (11.2 in), spread over 29 rainy days. This month continues the trend of the wet season, building on the heavy rainfall from May, which recorded an impressive 468 mm (18.4 in). As the rainy season peaks, the consistent rainfall not only enhances the lush landscape, with vibrant flora in full bloom, but also prepares the region for the subsequent downpour in October, where totals can soar to 479 mm (18.9 in). Overall, September serves as a critical transitional month, tempering the intense rains of the preceding months while setting the stage for what lies ahead.
September in Turrialba, Costa Rica, experiences a notable humidity level of 81%, continuing a trend established over the preceding months of a humid climate. The rainy season reaches its peak from June to August, with humidity soaring to a high of 85% in July. As we transition into September, there is a slight decrease, yet the humidity remains palpable. This month follows a pattern of high humidity that characterizes the latter half of the year, with levels dropping only modestly to 80% in October and November. Overall, September contributes to Turrialba's reputation for a warm, tropical feel, where the lush landscapes thrive under the rich humidity.
In September, Turrialba, Costa Rica, maintains its trend of high UV exposure, with an UV Index consistently hitting 14, placing it in the extreme category. This level of UV radiation means that even short exposure can lead to burns in just 10 minutes, emphasizing the need for sun protection. This month continues a pattern of elevated UV indices seen throughout the year's earlier months, where figures have ranged from 12 to a peak of 15. As such, anyone relishing outdoor activities must prioritize safety while basking in Turrialba's tropical allure. For more detailed information, you can visit Turrialba UV Index.
UV Risk Categories
September in Turrialba, Costa Rica, brings a delightful blend of sunshine, as the region enjoys 270 hours of radiant daylight. Following the peak of spring with March's impressive 330 hours, the sunshine hours gradually taper off leading into the later months of the year. While September experiences slightly less sunlight than its immediate predecessor August with 261 hours, it remains consistent with the late-year trend characterized by steady availability of daytime warmth. Even as the region approaches the rainy season, the lingering hours of sunshine offer a refreshing embrace, inviting visitors to explore the lush landscapes and vibrant culture that flourish under the sun’s gentle gaze.
In Turrialba, Costa Rica, the prospects for sunny weather in September are notably low, with only a 12% chance of sunshine. This trend is consistent with the preceding months, particularly August, which sees an even lower likelihood at 8%. As the rainy season peaks, the chances for clear skies diminish significantly, contrasting sharply with the more favorable conditions found at the beginning of the year, such as January's 41% chance of sun. While September may not offer much in terms of sunny days, the lush landscapes nurtured by the rain bring a unique beauty to the region, making it a different yet captivating time to visit.
In Turrialba, Costa Rica, the rhythm of daylight exhibits a fascinating pattern throughout the year. Notably, September boasts a consistent 12 hours of daylight, mirroring the extended light that characterizes the heart of the rainy season. This marks a peak in daylight duration, which remains stable from March through August, before gradually diminishing in the final months of the year. As October approaches, daylight retreats to 11 hours, signaling a gentle transition towards shorter days. This steady cadence not only enhances the vibrant biodiversity of the region but also enriches the daily lives of its residents, who bask in the warm, consistent daylight that September so graciously provides.
September in Turrialba, Costa Rica, greets visitors with a gentle embrace as the average wind speed settles at 1.2 m/s (3 mph). This marks one of the calmest months of the year, following a gradual decline from the slightly breezier spring months. As the dry season begins to fade, the winds remain soft and soothing, providing a tranquil backdrop for the vibrant landscapes that characterize this remarkable region. The consistently mild winds in September reflect a broader trend of decreasing air movement as the year progresses towards its quieter months, inviting both locals and travelers to fully immerse themselves in the serene beauty of Turrialba’s lush surroundings.
Weather in Turrialba varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Turrialba, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is typically warmer and more humid, with average temperatures ranging from a minimum of 15°C (59°F) to a maximum of 26°C (79°F). This month also sees significant rainfall, with total precipitation reaching 284 mm (11.2 in) across 29 days. In contrast, January experiences milder temperatures, averaging between 11°C (52°F) and 24°C (75°F), and significantly lower precipitation of 194 mm (7.6 in) over just 17 days. The humidity in January drops to 68%, making it a less muggy month compared to September. For a more detailed look at January's weather, you can visit Turrialba weather in January.
September and February present distinct weather patterns, highlighting the transition from the rainy season to the drier months. September typically experiences warmer temperatures, with a minimum of 15°C (59°F) and an average of 19°C (67°F), peaking at 26°C (79°F). However, it is also characterized by heavy rainfall, with 284 mm (11.2 in) spread over 29 days and a high humidity level of 81%. In contrast, February offers a cooler climate, with minimum temperatures around 10°C (51°F) and an average of 17°C (63°F), reaching a maximum of 24°C (76°F). The precipitation in February is significantly lower at 105 mm (4.1 in), over just 18 days, accompanied by a more comfortable humidity level of 68%. For a detailed look at the February weather, you can explore Turrialba weather in February.
September and March present contrasting weather experiences. In September, temperatures range from a minimum of 15°C (59°F) to a maximum of 26°C (79°F), with an average of 19°C (67°F). This month sees significant precipitation, totaling 284 mm (11.2 in) over 29 days, accompanied by high humidity levels of 81%. In contrast, March has milder temperatures, with a minimum of 11°C (51°F) and a maximum of 24°C (75°F), leading to a slightly lower average of 17°C (63°F). Precipitation drops to 117 mm (4.6 in) over 20 days, and humidity is more comfortable at 66%. For more detailed insights about the weather in March, you can visit Turrialba weather in March.
When comparing the weather in September and April, both months exhibit similar average temperatures, hovering around 19°C (66-67°F), with maximums peaking at 26°C (78-79°F). However, September is significantly wetter, receiving 284 mm (11.2 in) of precipitation across 29 days, compared to April's 167 mm (6.6 in) over 27 days. Additionally, the humidity in September is higher at 81%, whereas April's humidity is more comfortable at 67%. For more detailed information about April weather, you can visit Turrialba weather in April.
When comparing September and May weather, both months exhibit mild temperatures, with September featuring a minimum of 15°C (59°F), an average of 19°C (67°F), and a maximum of 26°C (79°F). In contrast, May has slightly warmer conditions, with temperatures ranging from a minimum of 14°C (58°F), an average of 20°C (67°F), to a maximum of 28°C (82°F). However, May is significantly wetter than September, receiving 468 mm (18.4 in) of precipitation over 30 days, compared to September's 284 mm (11.2 in) over 29 days. Additionally, humidity levels in September are higher at 81%, while May has a more comfortable humidity of 69%. For a more detailed look at May weather, you can check Turrialba weather in May.
When comparing the weather in September and June, both months exhibit similar temperature ranges, with minimums around 15°C (59°F) and maximums slightly varying from 26°C (79°F) in September to 27°C (80°F) in June. However, June is characterized by a marginally higher average temperature of 20°C (68°F) compared to September's 19°C (67°F). Precipitation levels are comparable, with September receiving 284 mm (11.2 in) and June slightly more at 292 mm (11.5 in), both spread over 29 days. Both months also experience high humidity, with September at 81% and June at 84%. For a more detailed look at June weather, you can refer to Turrialba weather in June.
September and July exhibit similar temperature ranges, with both months showing a minimum of 15°C and an average of 19°C. However, September typically experiences slightly warmer maximum temperatures at 26°C compared to July's 25°C. Precipitation is notably higher in September, with 284 mm over 29 days, whereas July sees 254 mm across 28 days. Humidity levels are also comparable, though September is marginally lower at 81% compared to July's 85%. For more detailed insights on July weather, check out Turrialba weather in July.
In comparing the weather between September and August, we see that both months share similar temperature ranges, with a minimum of 15°C (59°F), an average of 19°C (67°F), and a maximum of 26°C (79°F). However, September experiences slightly more precipitation, totaling 284 mm (11.2 in) over 29 days, compared to August's 243 mm (9.5 in) over the same number of days. The humidity remains quite high in both months, with September at 81% and August at 82%. For more detailed insights into August weather, you can visit Turrialba weather in August.
September and October weather exhibit some similarities but also notable differences. Both months maintain an average temperature of around 19°C (67°F), with October slightly warmer at a maximum of 27°C (81°F) compared to September's 26°C (79°F). However, October experiences significantly higher precipitation, with 479 mm (18.9 in) of rain over 30 days, in contrast to September’s 284 mm (11.2 in) over 29 days. Humidity levels remain relatively consistent, with September at 81% and October at 80%. For a closer look at the specific weather patterns in October, you can check out Turrialba weather in October.
September and November share similar average temperatures, with September experiencing a slightly warmer maximum of 26°C (79°F) compared to November's 24°C (76°F). However, November sees increased precipitation, totaling 341 mm (13.4 in) over 27 days, compared to September's 284 mm (11.2 in) across 29 days. Additionally, humidity levels remain high in both months, with September at 81% and November slightly lower at 80%. For more details on November weather conditions, you can check Turrialba weather in November.
September and December exhibit distinct weather patterns, with September being slightly warmer but more humid. September experiences average temperatures ranging from 15°C (59°F) to a maximum of 26°C (79°F) and notably high humidity at 81%. In contrast, December's temperatures are a bit cooler, averaging between 12°C (54°F) and 23°C (74°F), with lower humidity at 72%. Precipitation levels are similar, with September receiving 284 mm (11.2 in) over 29 days and December totaling 290 mm (11.4 in) over just 20 days. For more detailed information, you can check Turrialba weather in December.
September in Turrialba is characterized by notable humidity and frequent rain, which sets it apart from other months in the year. With an average temperature that hovers around a pleasant 19°C (67°F), this month brings a comfortable warmth despite the heavy downpours—amounting to approximately 284 mm (11.2 in) over 29 days. This unique combination of cool temperatures and high precipitation creates a lush, vibrant landscape, making it an ideal time for nature enthusiasts to explore the region’s rich biodiversity. For a deeper understanding of how Turrialba's weather patterns develop throughout the year, check out the detailed insights available at Turrialba Climate.