Last updated: August 21, 2025
Experience the enchanting climate of Alajuela, Costa Rica, in May, where the average temperature hovers around 21°C (70°F), providing a comfortable backdrop for any adventure. With maximum temperatures reaching 28°C (83°F) and a cooler minimum of 16°C (61°F), this month offers a delightful range for visitors. However, be prepared for rainfall, as May registers 391 mm (15.4 in) of precipitation across 27 rainy days, contributing to the lush greenery that this region is renowned for. The humidity stands at 69%, creating a pleasantly tropical atmosphere, perfect for exploring the vibrant natural beauty and rich cultural offerings of Alajuela.
In May, Alajuela, Costa Rica, begins to embrace the warm embrace of the rainy season. With minimum temperatures rising to 16°C (61°F), nights are pleasantly mild, while daytime temperatures hover around an average of 21°C (70°F). The month sees a maximum of 28°C (83°F), similar to previous months, creating a consistent warmth that encourages outdoor exploration. As rainfall becomes more frequent, the lush landscapes thrive, making it an ideal time to experience the vibrant natural beauty of this region without extreme heat. May serves as a delightful transition, blending comfortably warm days with the refreshing rain that nourishes Alajuela’s stunning scenery.
In Alajuela, Costa Rica, May marks a significant shift in the weather pattern, characterized by a dramatic spike in precipitation. With 391 mm (15.4 in) of rain, the month stands out as the wettest of the year, nearly five times the amount recorded in April (79 mm). This deluge falls over 27 days, making May not just the rainiest month, but also one of the most consistent in terms of wet days, as showers become a daily occurrence. The increase in rainfall heralds the transition into the peak of the rainy season, setting the stage for the lush, vibrant landscapes that define this region. As the month progresses, the pattern of heavy rainfall continues, leading into the similarly wet June, showcasing a clear trend toward intensified precipitation leading into the mid-year months.
In May, Alajuela, Costa Rica experiences a slight uptick in humidity, with levels reaching 69%, which is the highest among the preceding months from January to April. This increase marks the beginning of the wet season, as the region transitions toward more tropical conditions typically felt during the summer months. After May, humidity levels surge dramatically, peaking at 84% in June and continuing to be quite high through the summer. The trend reveals a pattern where early months of the year maintain relatively lower humidity, while the latter part increasingly contributes to the lush greenery and vibrant ecosystems for which Costa Rica is renowned. This gradual rise in moisture levels signals the onset of vibrant landscapes and heavy rainfall, inviting both locals and tourists to embrace the unique climate of this beautiful region.
In May, Alajuela, Costa Rica, continues to experience an extreme UV Index of 14, closely mirroring the preceding months, April and March, both of which also reached a UV Index of 15. This sustained high level of UV radiation demands caution, as individuals may experience sunburn in as little as 10 minutes of unprotected exposure. The trend for the early part of the year indicates a consistent pattern of extreme UV conditions, which makes it essential for residents and visitors alike to take proactive sun protection measures. With the UV Index hovering between 13 and 15 from January through May, it’s clear that staying informed is crucial. For more detailed information on UV exposure levels, visit Alajuela UV Index.
UV Risk Categories
In the vibrant town of Alajuela, Costa Rica, May experiences a delightful dip in sunshine, with around 235 hours of golden rays. This month follows a brilliant mar of sunshine showcased in March, which boasts 329 hours, setting a high standard for outdoor enthusiasts and sun-seekers alike. Although May sees a reduction in daylight compared to the preceding months, the overall trend suggests a gradual tapering of sunlight from the bustling beginning of the year into the lush, green surroundings of the rainy season. As we transition into June, the sunshine continues to wane, dropping to 226 hours, highlighting May's unique role as a bridge between the dry season and the rejuvenating rains. The gentle decline in sunshine hours fosters a serene atmosphere, making it an ideal time for travelers to savor the natural beauty and rich culture of Alajuela before the rainy season fully sets in.
As the calendar transitions into May, Alajuela, Costa Rica, experiences a notable dip in sunshine, with a mere 14% chance of sunny weather. This marks a significant decline from the previous months, with April offering a more promising 20% chance. Following the dry season, the rainy season begins to take hold, leading to a pattern of clouds and showers that extends into June, which shares the same likelihood of sun. It's clear that May signals the onset of this wetter period, making it a time for travelers to pack their rain gear and plan for occasional downpours rather than basking in bright sunshine.
In Alajuela, Costa Rica, the daylight duration follows a captivating rhythm throughout the year. From January to April, the hours of sunlight gradually increase, peaking at 12 hours in March and remaining consistent through the following months of May, June, July, and August. This steady exposure to daylight creates a vibrant atmosphere ideal for enjoying outdoor activities and exploring the stunning natural landscape. As autumn approaches in September, daylight duration remains stable at 12 hours before gently tapering off in October to 11 hours, and continuing with shorter days through the end of the year. This seasonal transition offers a delightful balance between longer days and the lush beauty of the surrounding environment, making Alajuela a year-round destination for sun-seekers.
As May unfolds in Alajuela, Costa Rica, the winds begin to soften significantly, averaging just 1.5 m/s (3 mph). This marks a continuation of the declining trend that began in April, where wind speeds dropped to their lowest for the year. With each passing month, the gentle breezes taper off, creating a calm atmosphere that prefaces the lush green landscapes of the rainy season ahead. Interestingly, the month following, June, sees even calmer winds at 1.2 m/s (3 mph), as the region settles into a tranquil rhythm, making May an ideal time for those seeking a peaceful escape. This seasonal lull reminds us of the serene beauty that characterizes Alajuela's transitional period, setting the stage for the refreshing rains of summer.
Weather in Alajuela varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Alajuela, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January present contrasting weather patterns. In May, temperatures range from a minimum of 16°C (61°F) to a maximum of 28°C (83°F), with a warm average of 21°C (70°F). This month sees considerable rainfall, averaging 391 mm (15.4 in) across 27 days, resulting in a humidity level of 69%. In contrast, January experiences milder temperatures, with a minimum of 13°C (56°F) and a maximum of 27°C (82°F), leading to an average of 20°C (68°F). Notably, January is much drier, receiving only 32 mm (1.3 in) of precipitation over just 6 days, while maintaining a similar humidity level of 68%. For more details on the weather in January, you can visit Alajuela weather in January.
May and February display notable differences in weather patterns. In May, temperatures range from a minimum of 16°C (61°F) to a maximum of 28°C (83°F), with an average of 21°C (70°F). This month experiences a significant amount of rainfall, totaling 391 mm (15.4 in) over approximately 27 days, contributing to a higher humidity level of 69%. In contrast, February offers slightly cooler temperatures, with a minimum of 13°C (56°F) and an average of 20°C (69°F), while still reaching up to 28°C (83°F). Precipitation in February is minimal, at just 13 mm (0.5 in) over only 3 days, resulting in a humidity level of 68%. For more detailed information, check out Alajuela weather in February.
When comparing the weather in May to that of March, we see some notable differences. Both months have similar average temperatures, hovering around 21°C (70°F), with maximums reaching 28°C (83°F). However, May tends to be wetter, with a staggering 391 mm (15.4 in) of precipitation spread over 27 days, while March enjoys a much drier climate with only 15 mm (0.6 in) over just 4 days. Additionally, humidity levels are slightly higher in May at 69%, compared to 66% in March, which may contribute to a more muggy feel. For more detailed insights, visit Alajuela weather in March.
In comparing the weather of April and May, we see a notable increase in precipitation. April boasts a maximum temperature of 29°C (85°F) with a total rainfall of 79 mm (3.1 in) over 16 days, while May experiences a slightly lower maximum temperature of 28°C (83°F) but a significant jump in rainfall to 391 mm (15.4 in) across 27 days. Despite the similar average temperatures of 21°C (70°F) in both months, May's humidity rises to 69%, slightly higher than April's 67%. For more detailed insights into April's weather, visit Alajuela weather in April.
In both May and June, temperatures remain quite consistent, with minimums around 16°C (61°F) and average temperatures hovering at 21°C (70°F). However, June sees a slight dip in maximum temperatures, averaging at 27°C (81°F) compared to May's 28°C (83°F). Precipitation decreases in June, totaling 351 mm (13.8 in) over the same 27 days, while humidity increases to 84% from May's 69%. Overall, while both months are similar in temperature, June is slightly cooler and less rainy, though more humid. For detailed insights, visit Alajuela weather in June.
May and July both experience mild temperatures, with minimums around 16°C (61°F) and average temperatures close to 21°C (70°F). However, July tends to be slightly cooler, reaching a maximum of 27°C (81°F) compared to May's 28°C (83°F). In terms of precipitation, May is considerably wetter, with 391 mm (15.4 in) over 27 days, while July sees only 233 mm (9.2 in) across 26 days. Additionally, humidity levels in July are higher at 85%, compared to May's 69%. For more detailed information, you can visit Alajuela weather in July.
May and August share similar temperature ranges, with both months experiencing minimum temperatures around 16°C (61°F), and maximum temperatures peaking at 28°C (83°F) in May and 28°C (82°F) in August. However, May tends to be wetter, receiving an average of 391 mm (15.4 in) of precipitation over 27 days, compared to August, which sees 331 mm (13.0 in) over 26 days. Additionally, humidity levels are higher in August at 82%, compared to May's 69%. For more detailed information, check out Alajuela weather in August.
In comparing the weather between May and September, both months experience relatively mild temperatures, with May averaging around 21°C (70°F) and September slightly cooler at 20°C (69°F). However, May tends to enjoy a slightly warmer maximum temperature of 28°C (83°F), compared to September's 27°C (80°F). Precipitation levels in September are notably higher, with 436 mm (17.2 in) of rain over 28 days, versus May's 391 mm (15.4 in) across 27 days, contributing toSeptember's higher humidity of 81%, compared to May's 69%. For more detailed information, you can check out Alajuela weather in September.
In May, the weather is generally warm with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 28°C (83°F), averaging around 21°C (70°F). However, it experiences significant rainfall, totaling 391 mm (15.4 in) over 27 days, with moderate humidity at 69%. In contrast, October features slightly cooler temperatures, with a minimum of 15°C (60°F) and a maximum of 27°C (80°F), averaging 20°C (68°F). October is notably wetter, with precipitation reaching 570 mm (22.4 in) across 29 days, accompanied by higher humidity at 80%. For more detailed weather information, check out Alajuela weather in October.
May and November exhibit distinct weather patterns. In May, temperatures range from a minimum of 16°C (61°F) to a maximum of 28°C (83°F), with an average of 21°C (70°F). This month also experiences significant rainfall, totaling 391 mm (15.4 in) over 27 days, contributing to a humidity level of 69%. In contrast, November features slightly cooler temperatures, with a minimum of 15°C (59°F), an average of 20°C (68°F), and a maximum of 26°C (79°F). Rainfall is reduced in November, amounting to 209 mm (8.2 in) across 19 days, but the humidity rises to 80%. For more detailed insights on November weather, visit Alajuela weather in November.
May and December in Alajuela exhibit distinct weather patterns, reflecting the transition from one season to another. In May, temperatures range from a minimum of 16°C (61°F) to a maximum of 28°C (83°F), with an average of 21°C (70°F). However, this month is characterized by considerable rainfall, totaling 391 mm (15.4 in) over 27 days, contributing to a humidity level of 69%.
In contrast, December offers slightly cooler temperatures, with a minimum of 15°C (58°F) and a maximum of 26°C (80°F), averaging around 20°C (68°F). The precipitation drops significantly to 63 mm (2.5 in) over just 11 days, and humidity rises slightly to 72%. For more detailed insights, you can check Alajuela weather in December.
May in Alajuela ushers in a dramatic shift in weather, as the city transitions into its wet season. While temperatures remain pleasantly warm, peaking at around 28°C, the increased humidity at 69% and substantial rainfall of 391 mm over 27 days create a lush, green landscape. This month stands in stark contrast to the drier months earlier in the year, making it a time when the vibrant beauty of Alajuela comes alive. Despite the showers, the average temperature of 21°C invites visitors to explore the natural wonders that flourish during this season. For a deeper understanding of how the weather patterns evolve throughout the year, check out Alajuela Climate.