Last updated: August 21, 2025
September in Santa Ana, Costa Rica is characterized by a tropical climate that keeps the temperatures mild and enjoyable. The maximum temperature reaches around 27°C (80°F), while the average hovers at a comfortable 20°C (69°F), with a minimum recorded at 15°C (60°F). However, this month is also marked by significant rainfall, totaling 436 mm (17.2 in) across 28 rainy days, contributing to the region's lush greenery. Humidity levels remain high at 81%, creating a vibrant atmosphere, perfect for experiencing the abundant natural beauty of this charming Central American destination.
September in Santa Ana, Costa Rica offers a delightful respite with temperatures that typically range from a minimum of 15°C (60°F) to a maximum of 27°C (80°F). This month maintains the trend of mild temperatures seen throughout the year, with an average of 20°C (69°F), creating a comfortable climate for outdoor activities. Notably, September is part of the rainy season, yet the temperatures remain consistent, mirroring those of the preceding months. As the year transitions from summer to fall, visitors can enjoy pleasant days tempered by the refreshing afternoon rains, making it an ideal time to explore the lush landscapes and vibrant culture of the region.
In September, Santa Ana, Costa Rica, experiences a significant uptick in precipitation, with a remarkable 436 mm (17.2 in) of rainfall recorded over 28 days. This surge marks the peak of the rainy season, as the region transitions from the drier months of early-year, where rainfall barely touched 32 mm in January and 13 mm in February. As the rain persists throughout the month, it sets the stage for October, which is historically even wetter, showcasing a pattern of increasing precipitation leading into the heart of the rainy season. This trend highlights September as a pivotal month in the annual weather cycle, characterized by both frequent rainfall and lush, vibrant landscapes that emerge as a result.
September in Santa Ana, Costa Rica, experiences a notable humidity level of 81%, reflecting the region's transition into the rainy season. This month showcases a slight decrease from the peaks of July and June, which register at 85% and 84%, respectively. The humidity remains high, consistent with the trend observed during the preceding summer months. As the year progresses into October and November, humidity levels begin to stabilize, hovering around 80%. Overall, September’s humidity embodies the tropical climate's lushness, serving as a reminder of the vibrant, verdant landscapes that thrive in Santa Ana.
In September, Santa Ana, Costa Rica, sees a UV Index of 13, maintaining the extreme exposure category. This trend demonstrates a consistent emphasis on sun safety, as the region has experienced high UV levels throughout the year, ranging from 12 to 15. Travelers and locals alike should continue to exercise caution, as the burn time remains a quick 10 minutes. With the UV Index persisting at elevated levels, it's crucial to plan outdoor activities wisely and stay protected. For more detailed information, check out Santa Ana UV Index.
UV Risk Categories
September in Santa Ana, Costa Rica, greets visitors with a warm embrace, showcasing 230 hours of brilliant sunshine. This month stands out as a transition point, situated between the lush, rain-soaked summer and the drier months to come. As the year progresses, September's sunny disposition reflects a subtle dip from the vibrant peaks of March, which boasts the highest sunshine hours at 329. Nevertheless, it maintains a delightful brightness, comfortably above the less radiant July and June, which hover around 209 and 226 hours respectively. As the days begin to shorten, the golden rays of September serve as a gentle reminder of the stunning weather that defines this beautiful region.
In September, the likelihood of sunny weather in Santa Ana, Costa Rica drops significantly to a mere 8%, marking it as one of the cloudiest months of the year. This trend of diminishing sunshine begins in April and descends steadily through the midsummer months, hitting a low in August before slightly rebounding in October. The clear shift toward overcast skies during the latter part of the rainy season makes September a prime time for lush landscapes but not for sun-seekers. While the lush greenery thrives, those looking for sunny adventures may need to pack their umbrellas instead and embrace the frequent showers that define this period.
In September, Santa Ana, Costa Rica enjoys approximately 12 hours of daylight, continuing a trend established in the previous five months. This consistency provides a perfect backdrop for outdoor adventures and exploration of the lush surroundings. As the year progresses from January's 11 hours of daylight to the longer days of March through August, it's clear that Costa Rica's tropical climate offers a wonderful balance of light and warmth. However, as October approaches, the daylight begins to decrease again, returning to 11 hours, hinting at the seasonal shifts that contribute to the region’s vibrant ecosystem and inviting ambiance.
As the September winds sweep through Santa Ana, Costa Rica, their gentle caress reflects a seasonal shift; the average wind speed drops to a serene 1.2 m/s (3 mph), nearly mirroring the calmness of the preceding months. This tranquility stands in contrast to the brisker winds felt at the beginning of the year, where average speeds reach up to 2.4 m/s (5 mph) in January. Notably, September's breezes offer a subtle reminder of the tropical charm that envelops the region, with winds gradually becoming lighter as they transition into October's softest whispers. Overall, September serves as a bridge between the lively gusts of early and late months, embodying a period of gentle stillness amidst the vibrant pulse of Costa Rica.
Weather in Santa Ana varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Santa Ana, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather of September and January, both months display similar average temperatures, hovering around 20°C (68°F). However, September is notably wetter, with a significant 436 mm (17.2 in) of rainfall over 28 days, leading to increased humidity at 81%. In contrast, January experiences much drier conditions, with only 32 mm (1.3 in) of precipitation spread over just 6 days, resulting in lower humidity at 68%. This difference makes January a more pleasant month for outdoor activities compared to the often rainy September. For more details about January weather, you can refer to Santa Ana weather in January.
In comparing September and February weather, September tends to be quite humid and wet, with an average temperature of 20°C (69°F) and a maximum of 27°C (80°F). The month sees significant precipitation of 436 mm (17.2 in) spread over 28 days, resulting in a high humidity level of 81%. In contrast, February offers a drier and less humid climate, with similar average temperatures of 20°C (69°F) but a slightly higher maximum of 28°C (83°F). February receives only 13 mm (0.5 in) of rainfall over just 3 days, leading to a lower humidity of 68%. For more detailed insights into February weather, check out Santa Ana weather in February.
In comparing the weather between September and March, September tends to be more humid and rainy, with an average temperature around 20°C (69°F) and frequent precipitation totaling 436 mm over 28 days. In contrast, March offers drier conditions with significantly less rainfall at only 15 mm across just 4 days, while temperatures remain mild, averaging 21°C (70°F) and peaking at 28°C (83°F). The humidity in March is also lower at 66%, making it feel more comfortable than the stickier September weather. For a more detailed understanding of March weather, you can check Santa Ana weather in March.
Comparing the weather in September and April reveals some notable differences. In September, temperatures range from a minimum of 15°C (60°F) to a maximum of 27°C (80°F), with an average of 20°C (69°F). This month is characterized by high humidity at 81% and significant rainfall totaling 436 mm (17.2 in) over 28 days, contributing to a rather wet atmosphere. In contrast, April experiences slightly warmer temperatures, with a minimum of 15°C (58°F), an average of 21°C (70°F), and a maximum reaching 29°C (85°F). Moreover, April is much drier, with only 79 mm (3.1 in) of precipitation over 16 days and lower humidity at 67%. For more details, visit Santa Ana weather in April.
In comparing the weather between September and May, we can see some notable differences. September typically has a slightly cooler average temperature, ranging from a minimum of 15°C (60°F) to a maximum of 27°C (80°F), while May offers a slightly warmer range from a minimum of 16°C (61°F) to a maximum of 28°C (83°F). However, September experiences higher precipitation levels, with a total of 436 mm (17.2 in) over 28 days, compared to May’s 391 mm (15.4 in) spread over 27 days. Additionally, humidity tends to be higher in September at 81%, opposed to May's 69%. For a more detailed look at May's weather, please check Santa Ana weather in May.
In comparing the weather of September and June, both months exhibit a similar range of temperatures, with September averaging 20°C (69°F) and June slightly warmer at 21°C (70°F). While the maximum temperatures are virtually identical, with both reaching around 27°C (80°F), September tends to be a bit wetter, receiving 436 mm (17.2 in) of precipitation over 28 days, compared to June's 351 mm (13.8 in) over 27 days. Additionally, humidity levels are slightly higher in June at 84%, compared to 81% in September. For more details on June weather, you can refer to Santa Ana weather in June.
When comparing the weather of September and July, we notice some intriguing differences. September typically experiences slightly cooler temperatures, with a minimum of 15°C (60°F) and an average of 20°C (69°F), while July's temperatures range from a minimum of 16°C (61°F) and an average of 21°C (69°F). Both months see a maximum temperature of 27°C (81°F). However, September is marked by significantly higher precipitation, totaling 436 mm (17.2 in) over 28 days, compared to July's 233 mm (9.2 in) over 26 days. The humidity levels in both months are relatively high, with September at 81% and July at 85%. For more detailed information about weather in July, you can check Santa Ana weather in July.
In comparing the weather between September and August, we observe that both months exhibit similar average temperatures, with September averaging 20°C (69°F) and August also at 20°C (69°F). However, September tends to be slightly cooler at night, with a minimum temperature of 15°C (60°F) compared to August's 16°C (60°F). In terms of precipitation, September is notably wetter, receiving 436 mm (17.2 in) of rain over 28 days, while August recorded 331 mm (13.0 in) over 26 days. Humidity levels remain high in both months, with September at 81% and August marginally higher at 82%. For more detailed insights, you can check Santa Ana weather in August.
In comparing the weather patterns of September and October, we observe that both months maintain a similar temperature range, with minimums at 15°C (60°F), averages around 20°C (69°F for September and 68°F for October), and maximums reaching 27°C (80°F). However, October sees a notable increase in precipitation, totaling 570 mm (22.4 in) over 29 days compared to September's 436 mm (17.2 in) across 28 days. Despite the slight decrease in humidity from 81% in September to 80% in October, the overall weather remains consistently humid, characteristic of the region. For more detailed insights, you can refer to Santa Ana weather in October.
In September, the weather tends to be slightly warmer, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 27°C (80°F) and an average of 20°C (69°F). This month also experiences heavy rainfall, totaling 436 mm (17.2 in) across 28 days, resulting in a humid environment with an average humidity of 81%. In contrast, November's weather is nearly comparable, featuring similar temperature ranges—15°C (59°F) minimum, 26°C (79°F) maximum, and an average of 20°C (68°F). However, November sees significantly less precipitation at 209 mm (8.2 in) over 19 days and a slightly lower humidity level of 80%. For more detailed insights into December weather patterns, check out Santa Ana weather in November.
In September, the weather is typically warmer and more humid, with temperatures averaging around 20°C (69°F) and reaching a high of 27°C (80°F). It also sees significant rainfall, with 436 mm (17.2 in) over 28 days, resulting in a humidity level of 81%. In contrast, December offers slightly cooler temperatures, usually hovering around 20°C (68°F) on average, with maximums only reaching 26°C (80°F). Precipitation drops dramatically to 63 mm (2.5 in) over just 11 days, which lowers the humidity to a more comfortable 72%. For more detailed information, you can check Santa Ana weather in December.
September in Santa Ana presents a unique contrast to other months, characterized by higher humidity levels and significant rainfall that sets the stage for a lush landscape. The temperatures, while generally mild, can feel warmer due to the sticky atmosphere, with highs pushing to 27°C. Unlike the dry heat of other months, frequent downpours often scatter across nearly every day, resulting in an impressive 436 mm of precipitation. This season invites a different charm, making it ideal for those who appreciate the richness of nature in bloom. Discover more about the region's weather patterns at Santa Ana Climate.