Last updated: August 21, 2025
In September, Zarcero, Costa Rica experiences a temperate climate with daily maximums reaching a pleasant 28°C (83°F) and an average around 21°C (70°F). The month is marked by significant rainfall, accumulating around 288 mm (11.3 in) over 29 days, making it one of the wettest periods of the year. With humidity levels soaring to 84%, the atmosphere feels lush and vibrant, contributing to the area's captivating scenery. Visitors and locals alike should be prepared for frequent showers, which enhance the region's rich, green landscapes, making September a unique time to experience the natural beauty of Zarcero.
In September, Zarcero, Costa Rica, maintains its mild climate with temperatures that reflect a subtle blend of warmth and coolness. With minimums around 16°C (62°F) and maximums reaching 28°C (83°F), the average temperature hovers comfortably at 21°C (70°F), making it an inviting time for visitors. This month is characterized by consistent temperatures similar to previous months, emphasizing a steady climate throughout the rainy season. As the terrain flourishes, the cooler nights provide a refreshing contrast, allowing for cozy evenings after a day of exploring the lush landscapes. Overall, September in Zarcero embodies a perfect balance of warmth and crispness, appealing to nature lovers and adventurers alike.
September in Zarcero, Costa Rica is characterized by substantial rainfall, as the region receives 288 mm (11.3 in) of precipitation over 29 days. This significant amount of rain marks a continuation of the wet season's intensity, building upon the already high totals from the preceding months of May through August. Notably, September's rainfall is slightly less than the following month, October, which peaks at 434 mm (17.1 in). The trend is clear: as Zarcero progresses deeper into the rainy season, precipitation remains consistently high, creating a lush, vibrant landscape that defines the region's unique charm.
As the year progresses in Zarcero, Costa Rica, September witnesses a notable increase in humidity, reaching an average of 84%. This peak occurs after a gradual rise that begins in the drier months of January, February, and March, where levels hover around 70%. The transition into the rainy season becomes evident by June, as humidity surges to 81%, peaking in July at 88%, creating a lush and vibrant environment. By September, while humidity slightly dips from its summer highs, the climate remains notably moist, characteristic of the verdant beauty that defines this region. As October approaches, humidity levels continue to decline, hinting at the impending transition to the drier months ahead.
In September, Zarcero, Costa Rica, continues to experience an extreme UV Index of 13, maintaining a pattern observed throughout the dry season. With a consistent burn time of just 10 minutes, outdoor enthusiasts should remain vigilant as they enjoy the vibrant natural beauty of this region. The UV Index during this month reflects the high levels of sun exposure typically characteristic of the area, following similarly high readings from August and preceding those in October. As the year progresses, maintaining sun safety remains crucial, so be sure to stay informed and prepared. For more detailed information, visit Zarcero UV Index.
UV Risk Categories
September brings a delightful 232 hours of sunshine to Zarcero, Costa Rica, providing a welcome respite from the rainier months of June and July, which see only 195 and 219 hours, respectively. As the year progresses, September stands out as a month of renewal, hinting at the vibrant landscapes that flourish after more frequent rain. This trend of increased sunlight continues into October, with just a slight dip to 218 hours, maintaining a pleasant climate for outdoor enthusiasts to explore the lush surroundings. Overall, September’s balance of sunshine and moisture sets the stage for the stunning natural beauty of this Costa Rican gem.
In Zarcero, Costa Rica, the trend for sunny weather shifts dramatically as the year progresses, reaching a notable low in September with just a 6% chance of sunshine. This decline is part of a broader pattern emerging during the rainy season, where the chances of clear skies dwindle significantly from the earlier months. While the year kicks off with a solid 32% probability of sun in January, rates plummet through the mid-year peak of rainy conditions, making September one of the least likely months to enjoy sunny weather in this scenic region. As the rainy season takes hold, residents and visitors alike should prepare for overcast skies and frequent downpours rather than basking in sunlight.
In Zarcero, Costa Rica, September brings a consistent 12 hours of daylight, maintaining the trend established from March through August. This balance of light continues to offer plenty of opportunities for exploration and outdoor activities. As the months progress, September stands out in the year for its stable daylight duration—providing a refreshing contrast to the shorter 11-hour days seen in January, October, November, and December. With its lush landscapes and vibrant culture, visitors in September can enjoy the same extended daylight that prevailed in the preceding months, making it an ideal time to experience the beauty of this enchanting region.
In Zarcero, Costa Rica, the gentle September breeze whispers a calmness that characterizes the month, with an average wind speed of just 1.3 m/s (3 mph), reminiscent of the serene summer days that precede it. As the year transitions from the lively winds of January through April, where gusts reach up to 2.8 m/s (6 mph), September marks a notable dip in airflow, mirroring the trend of the preceding months. This lull continues into October, reflecting the seasonal shift as the dry season approaches. However, in November, a refreshing upswing occurs, with winds picking up again, signaling the return of vitality to the landscape. This cyclical pattern highlights the tranquil charm of Zarcero’s climate, inviting visitors to enjoy the peaceful ambiance of early fall.
Weather in Zarcero varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Zarcero, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather tends to be warmer and significantly wetter than in January, with average temperatures ranging from a minimum of 16°C (62°F) to a maximum of 28°C (83°F). This month also sees high humidity levels at 84% and abundant rainfall, with 288 mm (11.3 in) spread over 29 days. In contrast, January experiences slightly cooler temperatures, with a minimum of 13°C (55°F) and a maximum of 27°C (80°F). The precipitation is significantly lower, totaling just 67 mm (2.7 in) over 10 days, and humidity levels drop to 71%. For more detailed information on January weather, you can check Zarcero weather in January.
September and February present distinct weather conditions, with September being notably wetter and more humid. September experiences temperatures ranging from a minimum of 16°C (62°F) to a maximum of 28°C (83°F) and sees substantial rainfall, totaling 288 mm (11.3 in) over 29 days. In contrast, February has a milder temperature range of 12°C (55°F) to 28°C (83°F) with significantly less precipitation, only 28 mm (1.1 in) spread over 9 days, and lower humidity at 70%. For a more detailed look at February's weather, you can visit Zarcero weather in February.
When comparing the weather in September and March, notable differences emerge. September features a warmer average temperature of 21°C (70°F), with a range from 16°C (62°F) to a maximum of 28°C (83°F). However, it is significantly wetter, experiencing 288 mm (11.3 in) of rainfall over 29 days, contributing to a high humidity level of 84%. In contrast, March presents a slightly cooler average temperature of 20°C (69°F), with a lower minimum of 13°C (56°F) and a similar maximum of 28°C (82°F). Additionally, March is much drier, with only 38 mm (1.5 in) of precipitation over 10 days and a humidity level of 68%. For more detailed information on the weather in March, you can check Zarcero weather in March.
When comparing the weather in September and April, we see some notable differences. September boasts a warmer temperature range, with a minimum of 16°C (62°F) and a maximum of 28°C (83°F), but it also experiences significantly higher precipitation, amounting to 288 mm (11.3 in) over 29 days and an elevated humidity level of 84%. In contrast, April features a slightly cooler minimum temperature of 15°C (59°F) and a higher maximum of 29°C (85°F), while enjoying much less rainfall at 92 mm (3.6 in) across 19 days and a lower humidity of 69%. For more detailed information, you can check out Zarcero weather in April.
September and May have similar minimum temperatures, both starting around 16°C (61-62°F), but May tends to be slightly warmer with an average temperature reaching up to 21°C (71°F) compared to September’s 21°C (70°F). However, May experiences slightly higher maximum temperatures, peaking at 29°C (85°F) opposed to September’s 28°C (83°F). Both months are characterized by substantial precipitation, with September receiving 288 mm (11.3 in) and May slightly more at 306 mm (12.0 in), averaging rainfall on 29 days in each month. A notable difference is the humidity level—September boasts a high humidity of 84%, while May is lower at 70%. For a more detailed look at May weather, you can check Zarcero weather in May.
When comparing the weather in September and June, we see that both months feature similar temperature ranges, with minimums around 16°C (62°F), average temperatures of about 21°C (70-71°F), and maximums reaching up to 28°C (82-83°F). However, September tends to have slightly higher precipitation, with 288 mm (11.3 inches) falling over 29 days, compared to June's 268 mm (10.6 inches) over 28 days. Humidity levels are also a bit higher in September at 84%, whereas June maintains a slightly lower humidity of 81%. This suggests that while both months are warm, September is typically wetter and more humid. For further insights on June weather specifics, check out Zarcero weather in June.
In comparing the weather patterns of September and July, we find that both months have similar average temperatures, with September presenting a minimum of 16°C (62°F) and a maximum of 28°C (83°F), while July's temperatures range from a minimum of 17°C (63°F) to a maximum of 27°C (81°F). However, September experiences significantly higher precipitation, totaling 288 mm (11.3 in) over 29 days compared to July's 241 mm (9.5 in) over 28 days, indicating a wetter month. Additionally, September has a slightly lower humidity level at 84%, compared to July's 88%. This comparison highlights September's wetter conditions despite its similar temperature profile. For more detailed insights, check out Zarcero weather in July.
In comparing the weather between August and September, we see that both months have similar temperature ranges, with minimums of 16°C (62°F) and average temperatures around 21°C (70°F). However, September tends to be slightly cooler at its maximum, reaching 28°C (83°F), while August peaks at 29°C (84°F). Additionally, September experiences a bit more precipitation, totaling 288 mm (11.3 in) over 29 days, compared to August's 273 mm (10.8 in) over the same number of days. The humidity levels are also quite comparable, with September at 84% and August slightly higher at 85%. For a closer look at August's weather specifics, you can check Zarcero weather in August.
In comparing the weather of September and October, both months exhibit similar temperatures, with September's average max at 28°C (83°F) and October slightly lower at 27°C (81°F). While minimum temperatures remain consistent at around 16°C (62°F), September experiences higher average temperatures at 21°C (70°F) compared to October's 21°C (69°F). However, October sees a notable increase in precipitation, with 434 mm (17.1 in) over 30 days, compared to September's 288 mm (11.3 in) over 29 days. This results in a slightly decreased humidity level in October at 82%, compared to 84% in September. For more detailed information on the weather conditions during this month, check out Zarcero weather in October.
In September, the weather tends to be warmer, with temperatures ranging from a minimum of 16°C (62°F) to a maximum of 28°C (83°F), averaging around 21°C (70°F). However, this month also sees significant rainfall, with a total precipitation of 288 mm (11.3 in) over 29 days, contributing to a high humidity level of 84%.
In contrast, November features slightly cooler temperatures with a minimum of 15°C (59°F) and a maximum of 26°C (79°F), averaging 20°C (69°F). Additionally, November experiences less rainfall, totaling 228 mm (9.0 in) over 26 days, and a lower humidity of 81%. For more details on conditions during this month, you can check Zarcero weather in November.
September and December exhibit noticeable differences in weather patterns. September typically experiences warmer temperatures, ranging from a minimum of 16°C (62°F) to a maximum of 28°C (83°F), along with high humidity at 84%. This month also sees significant rainfall, with 288 mm (11.3 in) falling over 29 days, making it one of the wetter months of the year. In contrast, December offers milder temperatures, with a minimum of 14°C (58°F) and a maximum of 26°C (78°F). The month is considerably drier, with only 121 mm (4.7 in) of precipitation over 17 days and a reduced humidity of 74%. For more detailed information, you can check Zarcero weather in December.
In September, Zarcero experiences a unique blend of mild temperatures and high humidity, setting it apart from other months. With the maximum temperature hovering around a comfortable 28°C (83°F) and frequent rainfall contributing to an impressive precipitation total, this month is characterized by lush greenery and vibrant landscapes. The almost daily rainfall, totaling 288 mm (11.3 in), adds to the region's lush beauty but also makes it one of the wettest months of the year. As a result, visitors can expect a refreshing atmosphere enveloped in a veil of mist, creating a serene backdrop for exploration. For more insights into what to expect year-round, visit Zarcero Climate.