Last updated: August 27, 2025
In September, Ratchathewi, Thailand, experiences a tropical climate characterized by warm temperatures and high humidity levels averaging around 87%. Daily maximums peak at a sweltering 36°C (97°F), while nighttime temperatures dip to a mild 24°C (76°F), leading to an overall average of 29°C (84°F). This month is marked by significant precipitation, totaling 245 mm (9.6 in) across approximately 24 days, highlighting the region's rainy season. Travelers and locals alike should be prepared for frequent showers amidst the rising temperatures, making this period a unique blend of warmth and moisture.
In September, Ratchathewi, Thailand experiences a warm tropical climate, characterized by a minimum temperature of 24°C (76°F), an average of 29°C (84°F), and a maximum of 36°C (97°F). As the monsoon season winds down, temperatures show a slight decrease from the peak summer highs in previous months, yet remain comfortably warm. This month marks a transitional period, with the daily heat moderated by occasional rain showers, making it a pleasant time to explore the vibrant streets of Ratchathewi. With humidity levels still relatively high, visitors can expect a mix of tropical warmth and refreshing breezes, perfect for enjoying the local culture and cuisine.
September marks a significant peak in precipitation for Ratchathewi, Thailand, with 245 mm (9.6 in) of rain falling over 24 days. This notable increase follows a pattern of rising rainfall throughout the monsoon months, where the wet season intensifies from April's 107 mm to the staggering 163 mm recorded in August. As September unfolds, it fosters lush landscapes, transforming the city with vibrant greenery, though it also means residents must prepare for frequent downpours. The trend suggests that as the rainy season progresses, September can often serve as both a culmination of the monsoon's fury and a precursor to the slightly drier days of October, which still delivers a hefty 250 mm of rain but in fewer days. This rhythm of precipitation underscores the characteristic embrace of tropical climate patterns in this lively region.
As September unfolds in Ratchathewi, Thailand, humidity remains notably high at 87%, slightly down from the peak of 88% experienced in August. This month marks the tail end of the region's humid season, where levels have steadily risen since April’s more moderate 70%. The gradual increase throughout the summer—from May's 80% to July and August's peaks—suggests a strong trend of moisture accumulation in the air. As the rainy season transitions, September retains significant humidity, hinting at the lingering warmth and potential rain that accompanies the shifting seasons. This pattern not only impacts the local climate but also influences everyday life, making it essential for residents and visitors to stay mindful of the tropical conditions.
In September, Ratchathewi, Thailand, experiences an UV Index of 13, categorizing the sunlight exposure as extreme. This trend of high UV levels persists, as seen throughout the summer months, with July and August both hitting a peak of 14. The burn time remains critically short at just 10 minutes, emphasizing the importance of sun protection during this period. As the year transitions into October, the UV Index slightly dips to 12, but still warrants caution. Overall, the consistent extreme UV levels from February through September underline the need for awareness and proactive measures for skin safety. For more detailed insights, you can visit Ratchathewi UV Index.
UV Risk Categories
September in Ratchathewi, Thailand greets visitors with a warm embrace, offering 268 hours of sunshine—a noticeable dip as the month transitions from the sun-drenched heights of summer. Following a vibrant peak in March, which boasts an impressive 336 hours of sunlight, the days gradually shorten, yet the warmth lingers. The trend of diminishing sunlight becomes more apparent as September falls in line with the tapering months of August and July, which yielded 280 and 290 hours, respectively. Despite this slight decline, September still holds its charm, maintaining a solid count of sun-soaked hours that invites outdoor exploration and leisurely afternoons under the golden Thai sky. As the year winds down, this month serves as a gentle reminder of the lush vibrancy that characterizes the region, effortlessly transitioning into the next season.
In Ratchathewi, Thailand, September marks a notable dip in the likelihood of sunny weather, with only a 10% chance of clear skies. This trend follows a steady decline from the relatively warmer months of January through March, where sunny days prevail at rates between 56% and 76%. As the year progresses into the rainy season, the chances of sun plummet sharply, hitting their lowest in July and August before slightly rising again in October. This seasonal pattern underscores September as a particularly dreary month, perfect for cozy indoor activities rather than sun-soaked excursions. If framing your travel plans, consider this historical trend, as the likelihood of basking in sunshine is notably slim during this time.
In Ratchathewi, Thailand, the daylight duration maintains a steady rhythm throughout the year, with September offering 12 hours of daylight—a continuation of the consistent pattern established from March to August. This stability reflects the region's tropical climate, where daylight remains relatively constant. As the months transition into October, daylight begins to wane slightly, dipping back to 11 hours, a precursor to the shorter days of the following months. The gradual shift in daylight duration not only marks the changing seasons but also enriches the daily life and activities in this vibrant locale, where the consistent light encourages a lively outdoor culture.
September in Ratchathewi, Thailand, brings a gentle breeze, with average wind speeds dropping to 2.0 m/s (5 mph). This marks a slight decline from the summer months where gusts reached their peak, particularly in June at 3.0 m/s (7 mph). As the rainy season approaches, the subtle winds provide a refreshing contrast to the rising humidity that characterizes the end of the monsoon. This month typically serves as a transitional phase, easing the way into a cooler October, which sees similar winds. With consistent but mild breezes throughout the year, September's air invites both locals and visitors to enjoy the vibrant streets of Ratchathewi without the interruptions of harsher winds.
Weather in Ratchathewi varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ratchathewi, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather patterns. In September, the temperatures range from a minimum of 24°C (76°F) to a maximum of 36°C (97°F), with an average of 29°C (84°F). This month also experiences significant rainfall, with 245 mm (9.6 in) over 24 days and high humidity at 87%. In contrast, January boasts milder temperatures, with a minimum of 16°C (61°F) and a maximum of 35°C (94°F), averaging 27°C (81°F). The precipitation drops significantly to just 29 mm (1.1 in) across 3 days, and humidity decreases to a more comfortable 59%. For a detailed look at January weather specifically, you can refer to Ratchathewi weather in January.
In September, the weather is significantly warmer and wetter compared to February. With minimum temperatures around 24°C (76°F) and averaging 29°C (84°F), September experiences frequent rainfall, totaling 245 mm (9.6 in) across 24 days, and a high humidity level of 87%. In contrast, February enjoys more moderate temperatures, with a minimum of 19°C (66°F) and an average of 28°C (82°F), while precipitation is minimal at just 14 mm (0.5 in) over three days and humidity is much lower at 58%. For a detailed look at February weather specifics in this region, check Ratchathewi weather in February.
In September, the weather tends to be significantly wetter and more humid compared to March. With average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 36°C (97°F), September experiences an average of 245 mm (9.6 in) of precipitation over 24 days, resulting in a humidity level of 87%. This creates a muggy atmosphere that can be quite uncomfortable for outdoor activities.
In contrast, March offers a drier climate with lower humidity levels at 61%. The temperatures in March are slightly higher, with a minimum of 22°C (72°F) and a maximum of 37°C (99°F), but it only sees about 44 mm (1.7 in) of rainfall over just 5 days. This makes March a better month for those who prefer clearer skies and less rain. For more detailed information, check out Ratchathewi weather in March.
September and April present distinct weather characteristics. In September, temperatures range from a minimum of 24°C (76°F) to a maximum of 36°C (97°F), with an average temperature of 29°C (84°F). This month experiences substantial rainfall, totaling 245 mm (9.6 in) across 24 days, accompanied by high humidity at 87%. In contrast, April boasts slightly warmer average temperatures, peaking at 38°C (100°F) and averaging 30°C (87°F), but with less precipitation at 107 mm (4.2 in) over just 12 days and lower humidity at 70%. For a closer look at weather conditions in April, check out this link: Ratchathewi weather in April.
When comparing the weather in September and May, we observe some notable differences. September experiences slightly higher humidity at 87% compared to May's 80%. The average temperature in September is 29°C (84°F), while May is a bit warmer, averaging 30°C (87°F). However, May can reach higher maximum temperatures, peaking at 40°C (103°F), compared to September's maximum of 36°C (97°F). Additionally, September is significantly wetter, receiving 245 mm (9.6 in) of precipitation over 24 days, whereas May has 142 mm (5.6 in) over 19 days. For more detailed information about May weather, you can visit Ratchathewi weather in May.
In September, the weather tends to be slightly cooler than in June, with average temperatures ranging from a minimum of 24°C (76°F) to a maximum of 36°C (97°F), compared to June’s minimum of 25°C (78°F) and maximum of 37°C (99°F). However, September is much wetter, experiencing 245 mm (9.6 in) of precipitation over 24 days, while June has significantly less rainfall at 112 mm (4.4 in) over 22 days. Humidity levels are relatively high in both months, with September at 87% and June at 85%, creating a persistent sense of warmth and mugginess. For more details on June's weather, visit Ratchathewi weather in June.
When comparing the weather in September and July, both months experience high temperatures and significant humidity, but with some notable differences. September has a minimum temperature of 24°C (76°F) and an average of 29°C (84°F), similar to July's minimum of 25°C (78°F) and average of 29°C (85°F). However, July sees slightly higher maximum temperatures, peaking at 37°C (99°F), while September reaches a maximum of 36°C (97°F). Additionally, September receives much more rainfall, with 245 mm (9.6 inches) over 24 days compared to July's 159 mm (6.2 inches) over 26 days. Overall, September tends to be wetter and slightly cooler, albeit with similar average temperatures and high humidity, as seen in Ratchathewi weather in July.
In comparing the weather between September and August, we see some notable similarities and differences. Both months feature average temperatures around the mid-29°C (84°F), but September experiences slightly lower minimum temperatures at 24°C (76°F) compared to August's 25°C (77°F). August tends to be a bit hotter overall, peaking at 37°C (99°F), whereas September's maximum temperature is slightly cooler at 36°C (97°F). Precipitation is significantly higher in September with 245 mm (9.6 in) over 24 days, contrasted with August's 163 mm (6.4 in) across 23 days. Humidity levels remain relatively constant, with September at 87% and August at 88%. For more detailed information about August weather, you can check this link: Ratchathewi weather in August.
As September transitions into October, the weather shows only slight variations. Both months boast an average temperature of 29°C (84°F), with September experiencing a slightly higher maximum temperature of 36°C (97°F) compared to October's 35°C (96°F). Precipitation remains relatively high in both months, with September receiving 245 mm (9.6 in) across 24 days, while October sees a marginally higher total of 250 mm (9.9 in) over 21 days. Humidity levels decrease slightly in October, falling from 87% in September to 83%. For a detailed look at the weather specifics in October, check out Ratchathewi weather in October.
In September, the weather is notably warmer with average temperatures reaching around 29°C (84°F), and maximums peaking at 36°C (97°F). The month is characterized by high humidity at 87% and significant rainfall, with 245 mm (9.6 in) of precipitation over 24 days. In contrast, November offers a slight cooldown, with an average temperature of 28°C (83°F) and a maximum of 35°C (95°F). The humidity decreases to 78%, and rainfall is considerably lighter, totaling only 61 mm (2.4 in) over just 9 days. For more detailed information on November weather, you can check Ratchathewi weather in November.
September and December exhibit notable differences in weather patterns. September tends to be much warmer, with average temperatures around 29°C (84°F) and maximums reaching up to 36°C (97°F), compared to December’s more moderate averages of 27°C (80°F) and a maximum of 35°C (95°F). Additionally, September is characterized by high humidity at 87% and significant rainfall, receiving 245 mm (9.6 in) over 24 days, leading to a rather damp atmosphere. In contrast, December sees significantly less precipitation, with only 24 mm (0.9 in) over just 2 days, and a drop in humidity to 70%. For more details on the specific conditions in December, you can check Ratchathewi weather in December.
As September unfolds in Ratchathewi, the weather presents a notable shift from the hotter, drier months that precede it. With an average temperature barely dipping from the summer highs, the month introduces a more humid atmosphere, resulting in frequent and often heavy rainfall, accumulating significantly over the weeks. While daytime temperatures can still soar to near 36°C, the increased precipitation, coupled with an average humidity of 87%, creates a distinctly tropical feel, making this period markedly different from the drier months of the year. For those curious about how the climate shapes this vibrant district, you can explore more at Ratchathewi Climate.