Last updated: August 27, 2025
Experience the tropical charm of San Juan, Philippines in September, where temperatures reach a maximum of 32°C (89°F), and maintain a comfortable average of 27°C (81°F). The pleasant warmth contrasts with the minimum temperatures dipping to 23°C (74°F) during the night. This month is characterized by significant precipitation, with a total of 343 mm (13.5 in) falling over approximately 26 days, creating a lush and vibrant landscape. Humidity levels soar to a high 87%, imbuing the atmosphere with a warm, tropical embrace. Whether you relish the rainfall or enjoy the warm evenings, September in San Juan offers a unique tropical experience.
In September, San Juan, Philippines, experiences a delightful blend of warmth and mildness, with temperatures ranging from a minimum of 23°C (74°F) to a maximum of 32°C (89°F). This month maintains an average temperature of 27°C (81°F), mirroring the consistent warmth found across the preceding summer months. As September transitions into fall, the slight dip in minimum temperatures from the previous month signals the onset of seasonal changes, yet the overall climate remains pleasantly warm. With its combination of sunshine and refreshing breezes, September is an inviting time to explore the stunning beaches and vibrant culture of San Juan, making it a perfect escape for travelers seeking a tropical getaway.
In September, San Juan, Philippines, experiences a notable transition in its climatic pattern, characterized by a significant precipitation amount of 343 mm (13.5 in) over 26 days of rain. Following the peak months of July and August, where rainfall reached extraordinary levels of 533 mm (21.0 in) and 609 mm (24.0 in) respectively, September maintains a high volume, albeit with a slight decline. This month's copious rains mark the tail end of the wet season, contributing to an atmosphere rich in humidity and vibrant greenery. As the region prepares for October's arrival, the lingering precipitation leaves a lasting impression on the local landscape, showcasing the dynamic interplay of seasonal weather patterns in this tropical paradise.
September in San Juan, Philippines, marks the continuation of the region's high humidity, peaking at 87%—a trend that has been steadily rising since June. This elevation in moisture levels, which began at a more comfortable 77% back in January, reflects the transition into the wet season, characterized by increasing humidity that culminates in October. July and August showcase the highest readings, indicating a summer climax of atmospheric moisture that sets the stage for the lush landscapes of the region. As the year unfolds, humidity tends to hover around the high 80s, suggesting a tropical climate that invites both the vibrant growth of flora and an unmistakable heaviness in the air.
As September arrives in San Juan, Philippines, the UV Index hits a striking 14, maintaining its place in the extreme exposure category alongside the previous summer months. With a burn time of just 10 minutes, sun-seekers should take extra precautions during this period. The trend indicates a consistent pattern of elevated UV levels from February through September, compelling residents and visitors to remain vigilant. As autumn approaches, the UV Index gradually dips to 13 in October, yet vigilance remains key for sun protection. For detailed UV forecasts and safety tips, explore more at San Juan UV Index.
UV Risk Categories
As the warm embrace of September settles over San Juan, the sun graces the region with an inviting 269 hours of sunshine, a modest dip from the vibrant summer months. This transition reflects a gradual shift in the weather, as the peak sunshine of May and June beckons visitors to bask in outdoor adventures. While September showcases fewer sunlit hours compared to the summer peak, it still outshines the early months of the year, hinting at the tropical charm that endures year-round. The lingering warmth of late summer melds seamlessly with the cooler breezes of the approaching fall, creating an ideal backdrop for exploration and relaxation along the beautiful shores of this Philippine gem.
In September, the likelihood of sunny weather in San Juan, Philippines stands at a relatively modest 38%, which marks a dip compared to the sunnier months preceding it. Following a streak of low sunshine probability in the summer months of June (16%), July (18%), and August (14%), September shows a slight improvement, though it's still overshadowed by the sunnier peaks of early spring to late fall, where chances soar to about 67% in March and 63% in November. This trend highlights a transitionary period, as the region begins to shift from the oppressive heat and humidity of summer towards more favorable weather in the coming months. While September may not guarantee endless blue skies, the hope for sun remains, serving as a gentle reminder that brighter days are just around the corner.
As September unfolds in San Juan, Philippines, it brings with it a steady 12 hours of daylight, mirroring the trend established in the preceding months of May, June, July, and August. The gradual transition from the longer days of summer to the shorter daylight hours of fall is evident, with daylight peaking in June at 13 hours before gently tapering. This rhythm of daylight duration showcases the consistent tropical climate, where variations are subtle yet charming, making September an ideal month for outdoor adventures under the warm sun, as daylight time remains generous and inviting.
As September rolls in, San Juan, Philippines experiences a noticeable dip in wind speed, averaging just 2.3 m/s (5 mph). This gentle breeze is a contrast to the more vigorous currents seen earlier in the summer months, like July’s moderate 4.0 m/s (9 mph) and August’s steady 3.6 m/s (8 mph). The month marks the transition to a calmer phase in the wind cycle, often reflecting the region's unique climatic patterns as it nears the tail end of the wet season. Despite this lull, September's soothing winds provide an ideal backdrop for relaxation, inviting both locals and visitors to savor the tranquil atmosphere that the season delivers. As the year progresses towards October, expectations shift again, as wind speeds climb back up to 3.1 m/s (7 mph), hinting at the dynamic changes yet to come in the months ahead.
Weather in San Juan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Juan, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather conditions. In September, temperatures range from a minimum of 23°C (74°F) to a maximum of 32°C (89°F), with an average of 27°C (81°F). This month is characterized by high humidity at 87% and significant rainfall, totaling 343 mm (13.5 in) over 26 days, creating a wet and humid atmosphere. In comparison, January experiences milder temperatures with a minimum of 20°C (68°F) and a maximum of 31°C (88°F), averaging 26°C (78°F). This month is markedly drier, receiving only 29 mm (1.1 in) of precipitation over just 3 days and featuring lower humidity at 77%. For more insights on January weather, check out San Juan weather in January.
In comparison to September, February offers a milder climate with a lower temperature range, featuring a minimum of 19°C (66°F) and an average of 25°C (78°F), compared to September's minimum of 23°C (74°F) and average of 27°C (81°F). February is also markedly drier, receiving only 16 mm (0.6 in) of precipitation over just 2 days, whereas September experiences significantly higher rainfall of 343 mm (13.5 in) across 26 days. Additionally, humidity levels are more comfortable in February at 73%, compared to the high humidity of 87% typical in September. For more detailed weather information, you can check San Juan weather in February.
When comparing the weather in September and March, notable differences emerge. September features warmer temperatures with a minimum of 23°C (74°F) and a maximum of 32°C (89°F), while March starts slightly cooler at a minimum of 21°C (70°F) but matches the maximum of 32°C (91°F). Humidity levels in September are significantly higher at 87%, contributing to a muggy atmosphere, whereas March enjoys a lower humidity level of 71%, making it feel more comfortable. Additionally, September experiences heavy rainfall, averaging 343 mm (13.5 in) over 26 days, contrasting sharply with March's dry spell of only 11 mm (0.4 in) over just 2 days. For more detailed information on March weather, check out San Juan weather in March.
September and April present distinct weather patterns, showcasing the transition between the wet and dry seasons. In September, temperatures hover between a minimum of 23°C (74°F) and a maximum of 32°C (89°F), with an average of 27°C (81°F). The month is characterized by high precipitation, receiving an average of 343 mm (13.5 in) over 26 rainy days and a humidity level of 87%, making it quite a damp month. In contrast, April is slightly warmer, with temperatures ranging from 22°C (71°F) to 32°C (90°F) and an average of 28°C (82°F). The weather is much drier, with only 28 mm (1.1 in) of rainfall over just 6 days and a humidity level of 73%. For more detailed insights, you can explore San Juan weather in April.
In September, the weather tends to be quite warm, with minimum temperatures around 23°C (74°F) and an average of 27°C (81°F), peaking at 32°C (89°F). However, this month also brings a high level of precipitation, with 343 mm (13.5 in) spread over 26 days, leading to a humidity level of 87%. In contrast, May offers slightly warmer conditions, with minimum temperatures of 24°C (76°F) and an average of 28°C (83°F), while still hitting a maximum of 32°C (89°F). The rainfall in May is significantly lower at 157 mm (6.2 in) over 23 days, contributing to a more comfortable humidity of 77%. For more details on the weather in May, you can visit San Juan weather in May.
In comparing the weather of September and June, both months exhibit warm temperatures with only slight variations. September has a minimum temperature of 23°C (74°F) and an average of 27°C (81°F), while June begins slightly warmer with a minimum of 24°C (76°F) and an average of 28°C (82°F). Interestingly, both months peak at a maximum of 32°C (89°F in September and 90°F in June), indicating consistent warmth. However, September sees significantly more precipitation with 343 mm (13.5 in) over 26 days, compared to June's 369 mm (14.5 in) across 28 days, suggesting slightly wetter conditions in June. Humidity levels are also comparable, with September at 87% and June at 85%. For a more detailed look at weather patterns, you can explore San Juan weather in June.
In comparing the weather of September and July, we see that both months share similar temperature ranges, with September having a minimum of 23°C (74°F) and an average of 27°C (81°F), while July starts slightly warmer with a minimum of 24°C (75°F) and a maximum of 31°C (88°F). Humidity levels are comparable, with September at 87% and July at 86%. However, September experiences significantly less rainfall, with 343 mm (13.5 in) over 26 days compared to July's 533 mm (21.0 in) over 29 days. For a more detailed look at July's weather specifics, you can refer to San Juan weather in July.
In comparing the weather between September and August, September tends to be slightly cooler with a minimum temperature of 23°C (74°F) compared to August's 24°C (75°F). Both months have an average temperature of around 27°C (81°F), but September features a marginally higher maximum temperature of 32°C (89°F) versus August's 31°C (87°F). Notably, September experiences significantly less rainfall, accumulating 343 mm (13.5 in) over 26 days, compared to August's 609 mm (24.0 in) over 29 days. Regardless of the month, the humidity remains constant at 87%. For a more detailed look at August weather, visit San Juan weather in August.
In comparing the weather between September and October, we see that both months have similar average temperatures, with October slightly cooler at a minimum of 22°C (71°F) compared to September's 23°C (74°F). However, October experiences significantly less precipitation, with 165 mm (6.5 in) over 14 days, compared to September's 343 mm (13.5 in) over 26 days. The humidity remains relatively stable, with September at 87% and October at 86%. Overall, October offers a drier climate while maintaining warm temperatures, making it a more pleasant month for outdoor activities. For further details, check out San Juan weather in October.
In comparing the weather of September and November, both months exhibit similar average temperatures, hovering around 27°C (81°F), with maximums reaching up to 32°C (90°F) in November. However, September tends to be significantly wetter, with a staggering 343 mm (13.5 in) of precipitation falling over 26 days, whereas November experiences much drier conditions, receiving only 71 mm (2.8 in) of rain across just 8 days. The humidity levels are comparable, with September at 87% and November slightly higher at 89%. For more detailed information, you can explore San Juan weather in November.
In September, the weather tends to be warmer and more humid, with average temperatures reaching around 27°C (81°F) and a maximum of 32°C (89°F). The month also experiences significant rainfall, totaling 343 mm (13.5 in) over 26 days, resulting in a humidity level of 87%. In contrast, December offers a slightly cooler climate with temperatures averaging 26°C (79°F) and a maximum of 31°C (88°F). Rainfall is minimal, with only 27 mm (1.1 in) of precipitation spread over about 5 days, and humidity decreases to 85%. For more details on the weather in December, you can check San Juan weather in December.
September in San Juan showcases its tropical charm with warm temperatures averaging around a balmy 27°C (81°F) and occasional peaks of 32°C (89°F). This month stands out for its higher precipitation, receiving about 343 mm (13.5 in) spread over 26 days, which is significantly more than other months. The humidity levels soar to 87%, enveloping the area in a heavy, lush atmosphere that contrasts strikingly with the drier periods. For those looking to understand the broader climatic patterns, you can explore more at San Juan Climate.