Last updated: March 19, 2025
In September, Kelaniya, Sri Lanka, experiences a warm tropical climate with maximum temperatures peaking at 32°C (90°F) and an average of 27°C (81°F), while the minimum temperature settles around 23°C (73°F). This month witnesses considerable rainfall, with a total precipitation of 245 mm (9.6 in) spread over 27 days, leading to a lush, green landscape. The high humidity levels at 82% contribute to a muggy atmosphere, making it essential for visitors and locals alike to prepare for occasional showers amidst the warmth.
In September, Kelaniya, Sri Lanka experiences a slight shift in its tropical climate, marked by a minimum temperature of 23°C (73°F), a consistent average of 27°C (81°F), and a maximum reaching 32°C (90°F). This month maintains the warmth seen in the preceding months, showcasing only a minor dip in nighttime temperatures compared to the peak heat of February and March. Interestingly, the steady averages across August and September suggest a transition toward the end of the dry season, hinting at the approaching monsoon with its characteristic humidity. As the temperatures remain relatively stable, visitors can expect warm days and mild nights, perfect for exploring the vibrant culture and lush landscapes that Kelaniya has to offer.
In September, Kelaniya experiences a significant amount of rainfall, with 245 mm (9.6 in) of precipitation spread over 27 days. This makes it one of the wetter months, continuing a trend observed since May, where heavy rains dominate the landscape. The rainfall levels in September are just shy of those in August, which recorded 250 mm (9.8 in). As the region transitions into the latter part of the monsoon season, precipitation remains high, and the near-monthly consistency reveals a pattern of sustained moisture, setting the stage for the even more substantial rains expected in October and November. This consistent precipitation supports the lush greenery for which Sri Lanka is renowned, while also reminding residents of the transformative power of monsoon rains.
In September, Kelaniya, Sri Lanka, experiences a notable humidity level of 82%, maintaining a trend observed over the preceding summer months. This marks a slight decrease from August's peak of 83%, but it still reflects the high humidity typical of the region as it transitions into the autumn. Throughout the year, humidity levels generally hover within the 73% to 83% range, with the highest readings occurring from June to August, suggesting the influence of the monsoon season. As the year progresses into October, humidity is expected to remain consistently high at 81%, indicative of the tropical climate that characterizes this vibrant locale. Overall, September's humidity underscores Kelaniya's lush environment, creating a rich backdrop for its stunning landscapes and vibrant culture.
In September, Kelaniya, Sri Lanka, experiences a UV Index of 14, placing it firmly in the extreme exposure category, with a burn time of just 10 minutes. This trend of high UV levels is consistent throughout the year, with values often peaking in the earlier months, such as March at 15. While September's index slightly dips from the mid-year highs of 14, it remains significant, reinforcing the necessity for sun protection. As the year transitions into October, the UV Index shows a slight decrease to 13, but the overall trend highlights the persistent need for vigilance against UV radiation. For ongoing updates and details about UV exposure, visit Kelaniya UV Index.
UV Risk Categories
As September unfolds in Kelaniya, Sri Lanka, the region enjoys a delightful 300 hours of sunshine, marking a transition from the more sun-drenched months of spring and summer. This slight dip from the bustling heights of 331 hours seen in March and April suggests a gradual shift towards the impending monsoon season. However, September still holds its charm, with ample sunlight to bask in, making it perfect for outdoor activities before the rain takes center stage. This trend of decreasing daily sunlight hours continues into October, yet the warmth and vibrancy of early autumn linger, allowing residents and visitors alike to savor Kelaniya’s stunning landscapes bathed in soft, golden light.
In September, the likelihood of sunny weather in Kelaniya, Sri Lanka, stands at a modest 14%, making it one of the less favorable months for sunshine. This trend aligns with the patterns observed from June to August, where the chances of clear skies are notably low, peaking at just 18% in June. Interestingly, September follows a slight uptick in sunny days as the year transitions towards the end. However, it remains overshadowed by both the brighter months of February at 50% and December, boasting 53% of sunny days. As the wet season persists in September, visitors should be prepared for overcast skies, with limited opportunities to bask in the sun.
In September, the beautiful town of Kelaniya, Sri Lanka enjoys a consistent 12 hours of daylight, a trend that has been established since March and continues through the end of the summer months. As the year progresses from January to February, daylight hours remain stable at 11 hours, but from March to September, residents experience a slight increase, leading to the full, vibrant days characteristic of the tropics. Following this peak, daylight gradually recedes to 11 hours in October, signaling the transition towards the shorter days of the latter part of the year. This steady rhythm of daylight duration fosters not only a predictable climate but also an inviting environment for both locals and travelers to embrace the charms of Kelaniya.
In September, Kelaniya experiences a delightful breeze with an average wind speed of 3.0 m/s (7 mph), marking a slight dip from the windier months of July and August. This change signals a transition as the region shifts from the peak of the monsoon season towards the more tranquil months ahead. Notably, September’s winds have consistently remained above the lower speeds recorded in the earlier months of the year, such as January’s 2.1 m/s (5 mph). As the year progresses, the winds in Kelaniya show a blend of light and moderate gusts, creating a pleasant and inviting atmosphere that complements the lush landscapes, making it an ideal time for outdoor activities and enjoying the vibrant local culture.
The weather in Kelaniya changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Kelaniya and find detailed weather information for every month.
September and January present distinct contrasts in weather conditions. September enjoys warmer temperatures, with a minimum of 23°C (73°F) and a maximum reaching 32°C (90°F), while January's minimum is slightly cooler at 19°C (66°F) but can peak at a higher maximum of 36°C (96°F). When it comes to precipitation, September is significantly wetter, experiencing 245 mm (9.6 in) of rain over 27 days, compared to January's much drier 68 mm (2.7 in) over just 6 days. Humidity levels are also slightly higher in September at 82%, compared to January's 77%. For more detailed insights about the January weather, you can check Kelaniya weather in January.
When comparing the weather in September and February, several key differences emerge. September presents a warmer average temperature, starting at a minimum of 23°C (73°F) and peaking at 32°C (90°F), with high humidity at 82%. The month is also marked by significant rainfall, totaling 245 mm (9.6 inches) over 27 days, which contributes to its muggy feel. In contrast, February offers a more varied temperature range, with a minimum of 20°C (68°F) and a maximum of 37°C (99°F), showcasing hotter days. Precipitation is considerably lower in February, at just 61 mm (2.4 inches) across 8 days, and humidity levels drop to 73%, making for a drier and potentially more comfortable climate. For more details on February weather, you can visit Kelaniya weather in February.
In September, the weather is typically warm with average temperatures ranging from a minimum of 23°C (73°F) to a maximum of 32°C (90°F). The month experiences high humidity at 82% and substantial rainfall, accumulating about 245 mm (9.6 in) over 27 days. In contrast, March offers slightly higher average temperatures, with a minimum of 22°C (73°F) and a maximum that can reach up to 37°C (99°F). Although it is still warm, March is significantly drier, with only 122 mm (4.8 in) of rainfall over 17 days and lower humidity at 74%. For more detailed weather information, check out Kelaniya weather in March.
In comparing the weather between September and April, we see distinct differences in temperature and precipitation. September features a cooler temperature range, with minimums around 23°C (73°F) and maximums reaching 32°C (90°F), while April showcases hotter days, with maximum temperatures peaking at an impressive 37°C (98°F). Precipitation in September is notably higher, with 245 mm (9.6 in) falling over 27 days, compared to April's 144 mm (5.7 in) across 25 days. Additionally, September experiences a higher humidity level at 82%, whereas April's humidity is relatively lower at 74%. For more specific details on April weather, you can visit Kelaniya weather in April.
In comparing the weather of September and May, both months experience warm temperatures, but with some notable differences. September sees minimum temperatures around 23°C (73°F) and averages of 27°C (81°F), while May has slightly warmer figures, starting at 24°C (75°F) and averaging 28°C (83°F). Maximum temperatures also peak higher in May, reaching up to 34°C (93°F), compared to 32°C (90°F) in September. Precipitation is more prevalent in May, with a total of 284 mm (11.2 in) over 29 days, slightly exceeding September's 245 mm (9.6 in) over 27 days. Additionally, May has lower humidity at 76%, compared to September's higher 82%. For more details, you can check Kelaniya weather in May.
In comparing September and June weather, both months exhibit similar high temperatures, with averages of 27°C (81°F) in September and 28°C (82°F) in June. However, September experiences slightly lower minimum temperatures, averaging at 23°C (73°F), while June begins at a minimum of 24°C (76°F). Precipitation is also noteworthy; September has 245 mm (9.6 in) of rainfall over 27 days, whereas June sees a higher total of 270 mm (10.6 in) across 29 days. Humidity levels remain consistently high at 82% for both months, contributing to a muggy atmosphere. For more detailed insights, you can check out Kelaniya weather in June.
In comparing the weather of September and July, we notice that both months share a similar temperature range, with July experiencing a minimum of 23°C (74°F), an average of 27°C (82°F), and a maximum of 32°C (89°F), while September sees the same minimum and average temperatures but reaches a peak of 32°C (90°F). However, September typically has higher rainfall, accumulating 245 mm (9.6 in) over 27 days compared to July's 205 mm (8.1 in) spread across 30 days. Humidity levels remain constant at 82% for both months, creating a consistently muggy atmosphere throughout the summer. For a closer look at the weather specifics in July, you can visit Kelaniya weather in July.
In comparing the weather between August and September, both months show similar average temperatures, with September having a slightly lower minimum temperature of 23°C (73°F) compared to August's 24°C (75°F). The maximum temperatures are also comparable, with September peaking at 32°C (90°F) while August reaches 31°C (88°F). However, September sees a decrease in overall precipitation, accumulating 245 mm (9.6 in) over 27 days, as opposed to August's 250 mm (9.8 in) over 29 days. Humidity levels remain quite similar, with September at 82% and August slightly higher at 83%. For more detailed insights on August weather, you can check Kelaniya weather in August.
In comparing the weather between September and October, both months share similar temperatures, with a minimum of 23°C (73°F), an average of 27°C (81°F), and a maximum of 32°C (90°F in September and 89°F in October). However, October sees an increase in precipitation, totaling 377 mm (14.9 in) over 30 days, compared to September's 245 mm (9.6 in) over 27 days. This slight rise in rainfall coupled with a marginally lower humidity level of 81% in October suggests a somewhat wetter atmosphere compared to September's 82% humidity. For more specific insights about the weather conditions, you can check Kelaniya weather in October.
In September, the weather features warm temperatures ranging from a minimum of 23°C (73°F) to a maximum of 32°C (90°F), with an average of 27°C (81°F). This month experiences substantial rainfall of 245 mm (9.6 in) over 27 days, coupled with high humidity levels at 82%.
Conversely, November presents a slightly cooler climate with similar temperature ranges—minimum of 22°C (72°F), maximum of 32°C (90°F), and an average of 27°C (80°F). However, November sees increased precipitation, totaling 358 mm (14.1 in) over 26 days, and slightly lower humidity at 80%. For more detailed insights, you can visit Kelaniya weather in November.
In September, the weather is characterized by warm temperatures, with a minimum of 23°C (73°F) and a maximum of 32°C (90°F), resulting in an average temperature of 27°C (81°F). However, this month is accompanied by significant rainfall, totaling 245 mm (9.6 in) across 27 days, and a high humidity level of 82%.
In contrast, December features slightly cooler conditions, with a minimum temperature of 20°C (69°F) and a maximum reaching 34°C (94°F), while still averaging at 27°C (80°F). The precipitation decreases to 170 mm (6.7 in) over just 16 days, and the humidity is marginally lower at 80%. This change in weather patterns highlights a notable reduction in both rainfall and humidity from September to December. For more details, you can check Kelaniya weather in December.
As September unfolds in Kelaniya, the weather showcases a distinct character compared to the drier months. With high humidity levels around 82% and significant rainfall accumulating to 245 mm over nearly 27 days, this month tends to be one of the wettest. The temperatures range comfortably, but the combination of high precipitation and humidity creates a lush, vibrant environment that feels markedly different from the preceding dry spells. If you're keen to learn more about the unique weather patterns throughout the year, explore our detailed guide here: Kelaniya Climate.