Last updated: March 19, 2025
September in Negombo, Sri Lanka brings a warm and humid atmosphere characterized by average temperatures around 27°C (81°F), peaking at a comfortable 30°C (86°F). It's a month marked by significant rainfall, with precipitation totaling 227 mm (8.9 in) over an impressive 26 days. The high humidity level of 82% adds to the tropical feel, making weather conditions quite humid and damp. Visitors should prepare for regular showers while enjoying the lush, vibrant landscapes that this vibrant coastal town has to offer.
In September, Negombo experiences mildly warm temperatures that hint at the transition from the peak summer months. With minimums around 25°C (77°F) and averages holding steady at 27°C (81°F), the atmosphere remains inviting for beachgoers and adventurers alike. The warmth peaks at 30°C (86°F), creating a comfortable environment for exploring the shores and vibrant local culture. Notably, September's temperatures closely mirror those of August, suggesting a consistent warmth that gradually starts to cool as the year progresses. The overall trend reflects a stable climate, perfect for enjoying the sun without the extreme heat of previous months, making it a delightful time to visit this coastal gem.
September brings significant rainfall to Negombo, Sri Lanka, with an average precipitation of 227 mm (8.9 in) over 26 days. This uptick marks a notable continuation of the wet season that begins in late spring and intensifies through the year. After a gradual rise in rainfall since May, which sees peak amounts nearing 281 mm (11.1 in), September's showers serve as a precursor to October, typically the wettest month, with 330 mm (13.0 in) on average. Such patterns highlight an overall trend where increased humidity and cloud cover during the late monsoon season lead to elevated rainfall totals, reinforcing the region’s lush, tropical landscape. As the rains sweep in, they not only rejuvenate the environment but also set the stage for the heavy downpours that define the heart of Negombo's rainy season.
In September, Negombo, Sri Lanka, experiences a notable humidity level of 82%, aligning closely with the consistently high humidity prevalent during the preceding months of June (82%), July (82%), and August (83%). This trend highlights a distinct pattern, as the humidity peaks during the middle of the year, creating a warm, tropical atmosphere. While the humidity tapers off slightly compared to August, the numbers remain elevated, indicating that September retains the sticky charm of Sri Lanka's coastal weather. As the year transitions toward the dryer months of October (81%) and November (80%), the lingering high humidity serves as a reminder of the region's lush, vibrant environment.
In September, Negombo, Sri Lanka, experiences a UV Index of 14, maintaining its status within the extreme exposure category. The trend throughout the year shows consistently high UV levels, with only slight fluctuations; from a maximum of 15 in April to 13 during the summer months of June, July, and August. This relentless intensity, with a burn time of just 10 minutes, underscores the importance of sun protection. Travelers and residents alike should remain vigilant during this month as sunlight remains potent, contributing to a consistently high UV Index from January through November. For more detailed insights on UV exposure levels, check out Negombo UV Index.
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As the summer sun continues to shine in Negombo, September boasts an impressive 304 hours of sunlight, contributing to a warm and inviting atmosphere. This month, while slightly less radiant than the peak of March with its lofty 336 hours, still holds its own against the backdrop of an otherwise vibrant year. The trend showcases a steady six-month stretch of sunny days from April to September, where hours fluctuate minimally between 304 and 334. This consistency presents a perfect backdrop for beachgoers and cultural enthusiasts alike, as September enjoys a wonderful balance of warmth while gently transitioning into the quieter months ahead.
In Negombo, Sri Lanka, the likelihood of sunny weather in September stands at a modest 18%, reflecting a pattern of lower sunshine probabilities typical of the region during this time of year. Following the peak sunny moments seen in February (54%) and the relatively brighter April (47%), September falls into a less favorable trend, much like the preceding months of July (16%), August (9%), and the cooler October (15%). This trend suggests that as the year progresses towards the end of the monsoon season, chances of sunny skies dwindle, making September a less ideal month for sun-seekers. Thus, visitors may want to have contingency plans for overcast days while enjoying the rich culture and stunning landscapes of Negombo.
In Negombo, Sri Lanka, September offers a consistent 12 hours of daylight, mirroring the preceding summer months. This steady duration highlights the region's tropical climate, where daylight remains abundant and vibrant for most of the year. As we transition from the long, sunlit days of August into October, a subtle shift occurs, with daylight beginning to decrease slightly, returning to 11 hours. This pattern suggests that the mid-year months are characterized by prolonged sunlight, perfect for those looking to explore the beaches and natural beauty of Negombo. The gradual ebb of daylight toward the end of the year signals the approach of a gentle shift into a more temperate phase, but September itself bustles with the warmth and energy of a sun-drenched season.
In September, Negombo, Sri Lanka, experiences a gentle shift in its winds, with an average speed of 5.2 m/s (12 mph), slightly lower than the breezy peaks of July and August. The month shows a consistent wind pattern that aligns with the increasing breeze observed since the earlier months. Following the relatively calm March with a mere 2.5 m/s, the winds have steadily picked up momentum, hinting at an invigorating transition into the more robust gusts of October. September’s breezes offer a pleasant backdrop for beachgoers, making it a delightful time to enjoy both the ocean's rhythm and the tropical landscape. As the winds swirl softly around, they signal the changing seasons and invite exploration of this picturesque coastal town.
The weather in Negombo 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 Negombo and find detailed weather information for every month.
In September, the weather is characterized by warmer temperatures, with a minimum of 25°C (77°F) and average highs reaching 30°C (86°F). This month sees significant rainfall, with 227 mm (8.9 in) of precipitation across 26 days, resulting in high humidity levels of 82%. In contrast, January offers slightly cooler conditions with a minimum temperature of 22°C (72°F) and an average high of 32°C (90°F). The precipitation dramatically decreases to 44 mm (1.7 in) over just 5 days, and humidity is relatively lower at 77%. For more detailed insights into January weather, you can visit Negombo weather in January.
September and February exhibit notable differences in weather patterns. In September, temperatures range from a minimum of 25°C (77°F) to a maximum of 30°C (86°F), with an average of 27°C (81°F). This month experiences significant rainfall, with 227 mm (8.9 in) of precipitation over 26 days, resulting in high humidity levels of 82%. In contrast, February boasts slightly lower minimum temperatures at 23°C (73°F), with warmer maximums peaking at 33°C (91°F) and an average of 27°C (82°F). Precipitation in February is markedly lower, with only 25 mm (1.0 in) over five days, and humidity levels are more comfortable at 73%. For more details on February weather, visit Negombo weather in February.
In comparing the weather between September and March, September tends to be slightly cooler with an average temperature of 27°C (81°F), compared to March’s warmer average of 28°C (83°F). September also experiences higher humidity at 82% and significantly more rainfall, with a total of 227 mm (8.9 in) spread across 26 days, making it a much wetter month. In contrast, March has a more moderate precipitation level of 94 mm (3.7 in) over 17 days, along with a maximum temperature that can reach up to 33°C (92°F). For more detailed information on the weather in March, you can visit Negombo weather in March.
In comparing the weather of September and April, both months feature warm temperatures, but April tends to be a bit hotter overall. September's temperatures range from a minimum of 25°C (77°F) to a maximum of 30°C (86°F), with an average of 27°C (81°F). In contrast, April has slightly higher averages, with minimums of 25°C (78°F) and maximums reaching up to 32°C (91°F), averaging around 28°C (83°F).
However, September experiences significantly higher precipitation at 227 mm (8.9 in) over 26 days, compared to April's 130 mm (5.1 in) over 25 days. This results in increased humidity in September at 82%, while April has a lower humidity level of 74%. For more details on April's weather, you can check Negombo weather in April.
When comparing the weather in September and May, both months showcase warm temperatures, with September having an average of 27°C (81°F) and May slightly warmer at 28°C (83°F). However, May tends to have higher maximum temperatures, reaching up to 31°C (88°F) compared to September's 30°C (86°F). Precipitation is notably heavier in May, with 281 mm (11.1 in) over 29 days, while September sees 227 mm (8.9 in) over 26 days. Additionally, the humidity levels are slightly lower in May at 76%, versus the higher humidity of 82% that characterizes September. For a closer look at May's weather conditions, you can refer to Negombo weather in May.
In comparing the weather between September and June, both months exhibit similar warm temperatures, with September recording a minimum of 25°C (77°F) and an average of 27°C (81°F), while June has slightly higher figures, starting at 26°C (78°F) and averaging 28°C (83°F). However, September experiences substantial rainfall, totaling 227 mm (8.9 in) over 26 days, whereas June receives even more precipitation at 241 mm (9.5 in) across 29 days. Interestingly, both months share the same humidity level of 82%, contributing to a consistently muggy atmosphere throughout. For a closer look at the specifics of June weather, you can visit Negombo weather in June.
September and July share similar temperature ranges, with both months experiencing minimum temperatures around 25°C (77°F) and maximum temperatures peaking at 30°C (86°F). However, September tends to be slightly cooler on average, with an average temperature of 27°C (81°F) compared to July's 28°C (82°F). In terms of rainfall, September is notably wetter, receiving 227 mm (8.9 in) of precipitation over 26 days, while July sees less rain at 160 mm (6.3 in) across 25 days. Humidity remains consistent at 82% for both months, creating a tropical climate that characterizes the region. For more specific information about July conditions, visit Negombo weather in July.
In comparing the weather between August and September, both months exhibit similar temperature ranges, with minimums hovering around 25°C (77°F) and average highs of 27°C (81°F). However, September sees slightly warmer maximum temperatures reaching up to 30°C (86°F) compared to August's peak of 29°C (85°F). Notably, September is also characterized by higher precipitation levels, totaling 227 mm (8.9 in) over 26 rainy days, while August experiences less rainfall at 181 mm (7.1 in) across 27 days. Humidity remains comparable, albeit slightly higher in September at 82% compared to August's 83%. For more detailed insights, you can check Negombo weather in August.
In September, the weather features consistent temperatures with a minimum of 25°C (77°F), an average of 27°C (81°F), and a maximum of 30°C (86°F). However, this month is marked by significant rainfall, accumulating to 227 mm (8.9 in) over 26 days, with humidity levels peaking at 82%.
Conversely, October sees a slight increase in temperature with a maximum reaching 30°C (87°F), while maintaining a minimum and average similar to September. Rainfall increases dramatically to 330 mm (13.0 in) across 29 days, yet humidity remains slightly lower at 81%. For more details on weather patterns, you can visit Negombo weather in October.
Both September and November showcase warm temperatures, with September averaging 27°C (81°F) and November slightly warmer at 27°C (81°F) but peaking a bit higher with a maximum of 31°C (88°F). Humidity levels are quite similar, with September at 82% and November at 80%. However, November experiences more rainfall, receiving 307 mm (12.1 in) over 24 days compared to September's 227 mm (8.9 in) across 26 days. For a closer look at weather patterns, you can check Negombo weather in November.
When comparing the weather in September and December, it's clear that both months share similar average temperatures, hovering around 27°C (81°F). However, September experiences slightly warmer minimum and maximum temperatures, ranging from 25°C (77°F) to 30°C (86°F), compared to December's range of 23°C (74°F) to 31°C (89°F). Additionally, September sees significantly more rainfall, with 227 mm (8.9 in) over 26 days, while December records only 146 mm (5.8 in) over 15 days. Humidity levels are comparable, with September at 82% and December slightly lower at 80%. For more detailed information about December weather, you can visit Negombo weather in December.
As September unfolds in Negombo, the weather transitions into a more tropical embrace, characterized by high humidity and frequent rainfall. With a significant amount of precipitation spread over almost the entire month, it contrasts sharply with the drier months preceding it, creating a lush, vibrant landscape. Temperatures remain consistently warm, averaging around 27°C, which keeps the tropical atmosphere alive. If you're considering a visit, be prepared for the intermittent rain that can enhance the local experience, blending the bustling beach vibe with refreshing tropical showers. For further details and insights about the year's weather patterns, check out Negombo Climate.