May Weather in Ratchaburi, Thailand

Last updated: August 27, 2025

May in Ratchaburi, Thailand, is characterized by hot temperatures, with a maximum of 40°C (105°F) and an average around 30°C (87°F), often reaching a minimum of 24°C (75°F) at night. This month experiences substantial rainfall, accumulating 141 mm (5.5 in) over approximately 20 days, contributing to a high humidity level of 79%. Visitors should be prepared for a tropical climate marked by both intense heat and frequent afternoon showers, ideal for enjoying the lush scenery but demanding a mindset attuned to shifting weather patterns.

May Temperature in Ratchaburi

In May, Ratchaburi, Thailand, experiences the height of warmth, with temperatures reaching a maximum of 40°C (105°F). The month marks a noticeable transition, as the minimum temperature rises to 24°C (75°F), providing a hint of the summer heat that’s to come. The average temperature remains steady at 30°C (87°F), mirroring the warmth of April while hinting at the forthcoming intensity of June. This trend reflects the gradual build-up of heat that characterizes tropical climates, making May a perfect time for sun lovers to enjoy the vibrant landscapes before the heavier rains of the monsoon season take hold.

May Weather in Ratchaburi: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Ratchaburi, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ratchaburi, May typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec798185878685848483828179
Data source: Temperature data for Ratchaburi generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Ratchaburi

May marks a significant turning point in Ratchaburi, Thailand, as the region experiences a dramatic surge in precipitation. With an impressive 141 mm (5.5 in) of rain falling over 20 days, May transitions the landscape into a vibrant tapestry of lush greenery. This month stands out distinctly compared to the preceding months; for instance, April's rainfall of 88 mm (3.5 in) is a mere fraction of what May delivers. The arrival of the monsoon season is evident as rainfall begins to accumulate extensively, contributing to the wetter trend that continues into June and beyond. As the dry spell recedes, the increased humidity and consistent downpours not only shape the local ecosystem but also signal the start of a more temperate climate leading into the heart of summer.

May Precipitation Trends in Ratchaburi

The chart displays monthly precipitation patterns in Ratchaburi, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Ratchaburi, May typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec211230881411251201672092028317
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Ratchaburi

In May, Ratchaburi, Thailand, experiences a notable rise in humidity, reaching 79%, which marks a significant increase from the preceding months. This uptick signals the approach of the rainy season, as humidity levels climb steadily from 69% in April to this peak. An observable trend is that humidity continues to surge into the following months, culminating in the high of 90% in August. This pattern indicates a transition from the drier start of the year, represented by 58% in January, to a much more humid climate as summer progresses, definitely shaping the region's weather dynamics and impacting both daily activities and local agriculture. As such, May stands as a pivotal month in Ratchaburi, where the air feels more saturated, hinting at the wetter days ahead.

May Average Humidity in Ratchaburi

This chart illustrates the average monthly humidity levels in Ratchaburi, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Ratchaburi is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec58%59%62%69%79%87%89%90%87%83%77%66%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Ratchaburi

In May, Ratchaburi, Thailand experiences a consistently high UV Index of 14, placing it firmly in the extreme exposure category. This means that just 10 minutes of unprotected sun exposure can lead to skin burns, making it crucial for residents and visitors alike to take protective measures against the sun's rays. The trend observed from January through May shows a sustained peak in UV levels, with May maintaining the same intensity seen in April and March. As summer unfolds, the UV Index remains perilously high, signaling the importance of sun safety practices throughout the month. For more detailed information on daily UV levels, check out Ratchaburi UV Index.

Maximum UV Index Levels in Ratchaburi for May

The chart shows the monthly maximum UV Index (UVI) for Ratchaburi in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Ratchaburi typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11121414141314141313109
Data source: Ratchaburi May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

May Sunshine in Ratchaburi

In May, Ratchaburi basks in 317 hours of sunshine, a slight dip from the peak of 333 hours in March but still robust as the region transitions into the mid-year months. This trend showcases a consistent pattern of bright days, echoing the highs of April and hinting at the vibrant summer ahead. As the temperatures rise, the sunshine remains plentiful, making May an inviting time for outdoor adventures and cultural explorations in this beautiful part of Thailand. Following May, the hours of sunlight begin to gradually decline, yet the warmth of June's 300 hours continues to keep the spirit of the sun alive.

Monthly Sunshine Duration in Ratchaburi: May Highlighted

The May sunshine duration represents the total number of hours Ratchaburi experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec251h299h333h319h317h300h280h267h260h283h293h315h
Data source: Ratchaburi May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Ratchaburi During May

As May approaches in Ratchaburi, Thailand, the likelihood of sunny weather tends to decline, with a 31% chance of sunshine for the month. This reflects a noticeable downturn from April’s 18% and marks a continuation of lower probabilities as the rainy season nears. Comparing May to the brighter months prior, such as February with 77%, it's clear that the sun tends to shy away from the sky during this transitional period. Following May, the chances continue to dwindle, dropping to a mere 16% in June, signaling that those planning outdoor activities may need to prepare for less-than-ideal weather. Thus, while May offers some opportunities for sun, it is wise to stay alert for evolving forecasts as the clouds start to dominate the horizon.

Percentage of Sunny Days in May in Ratchaburi

The chart illustrates the percentage of sunny days in Ratchaburi throughout the year, with May highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Ratchaburi experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec62%77%59%18%31%16%11%8%8%14%26%62%
Data source: Ratchaburi May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Ratchaburi in May

In Ratchaburi, Thailand, the daylight duration exhibits a fascinating rhythm throughout the year. Beginning with consistently shorter days in January and February at 11 hours, the sunlight gradually stretches as spring approaches, peaking in March and April with 12 hours of daylight. This delightful 12-hour balance continues into May, signaling the onset of summer, where it remains stable through the subsequent months of June, July, August, and September. As the year winds down, daylight starts to recede once more, returning to 11 hours in October and continuing into the final months of the year. This trend illustrates the region's subtropical climate, ensuring a generous share of sunlight, particularly in the mid-year months, perfect for outdoor adventures and exploring the vibrant landscapes of Ratchaburi.

Average Daylight Hours in Ratchaburi for May

The chart illustrates the variation in daylight duration in Ratchaburi throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 24m11h 41m12h 2m12h 25m12h 44m12h 53m12h 49m12h 32m12h 10m11h 48m11h 29m11h 19m
Data source: Ratchaburi daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Ratchaburi

In May, Ratchaburi experiences a gentle average wind speed of 1.8 m/s (4 mph), reflecting a slight decrease from the busier winds of the preceding months. This month falls within a pattern of fluctuating breezes, with speeds dipping notably in April before rebounding slightly. Interestingly, the winds begin to pick up again in June and July, both averaging 2.2 m/s (5 mph), suggesting that as the summer heats up, the localized weather patterns may shift towards stronger gusts. Overall, the mild winds of May offer a serene atmosphere, ideally suited for enjoying the beautiful landscapes of Ratchaburi before the more robust winds of the subsequent months set in.

Average May Wind Speed in Ratchaburi

The chart displays monthly wind speed patterns in Ratchaburi, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.12.02.21.61.8 m/s2.22.22.01.51.72.12.4
Data source: Ratchaburi May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Ratchaburi Compares to Other Months

Weather in Ratchaburi varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Ratchaburi, focusing on differences in temperature, rainfall, humidity, and UV levels.

In May, temperatures in Ratchaburi soar, ranging from a minimum of 24°C (75°F) to a scorching maximum of 40°C (105°F), with an average of 30°C (87°F). The month is characterized by high humidity at 79% and significant rainfall, receiving 141 mm (5.5 in) over approximately 20 days. In stark contrast, January offers a milder climate, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 34°C (94°F), averaging 26°C (80°F). Rainfall is minimal in January, totaling just 21 mm (0.8 in) over about 3 days, accompanied by lower humidity at 58%. For those interested in more details, consider checking Ratchaburi weather in January.

May and February display striking differences in weather conditions. In May, temperatures range from a minimum of 24°C (75°F) to a scorching maximum of 40°C (105°F), with an average of 30°C (87°F). The month also experiences significant rainfall, totaling 141 mm (5.5 in) over 20 days, coupled with high humidity at 79%. In contrast, February offers a milder climate, with temperatures ranging from a minimum of 19°C (67°F) to a maximum of 36°C (97°F) and an average of 27°C (82°F). This month sees much less precipitation, accumulating only 12 mm (0.5 in) over just 2 days, and a more comfortable humidity level of 59%. For a detailed look at February weather, you can refer to Ratchaburi weather in February.

In comparing the weather of May and March, it's evident that May is significantly warmer and more humid. May boasts minimum temperatures of 24°C (75°F) and can reach up to 40°C (105°F), whereas March's temperatures range from a minimum of 21°C (70°F) to a maximum of 38°C (102°F). Additionally, May experiences much higher precipitation, with 141 mm (5.5 in) over 20 days, in stark contrast to March's 30 mm (1.2 in) across just 4 days. The humidity in May also notably increases to 79%, compared to March’s 62%. For more detailed information, you can check out Ratchaburi weather in March.

In comparing the weather between April and May, both months share a similar average temperature of 30°C (87°F) but show notable differences in other aspects. May experiences slightly higher minimum and maximum temperatures, with lows of 24°C (75°F) and highs reaching 40°C (105°F), compared to April's range of 21°C (70°F) to 40°C (104°F). Additionally, May sees a significant increase in precipitation, with 141 mm (5.5 in) over 20 days, compared to April’s 88 mm (3.5 in) over just 11 days. The humidity also rises in May to 79%, while April maintains a lower level at 69%. For more detailed information about April's weather, check out Ratchaburi weather in April.

In comparing the weather between May and June, we see some notable differences. May tends to be slightly warmer, with minimum temperatures at 24°C (75°F) and maximums reaching up to 40°C (105°F), whereas June has a minimum temperature of 25°C (77°F) and a maximum of 38°C (100°F). The average temperature in May is 30°C (87°F), comparable to June's 30°C (85°F). In terms of precipitation, May is wetter, receiving 141 mm (5.5 in) over 20 days, while June sees a bit less rainfall at 125 mm (4.9 in) over 21 days. Humidity levels also rise in June, reaching 87% compared to May's 79%. For more detailed insights about the weather in June, you can check Ratchaburi weather in June.

In May, temperatures are generally warmer, with a minimum of 24°C (75°F) and an average high reaching 40°C (105°F), while July sees slightly cooler temperatures, with a minimum of 25°C (77°F) and a maximum of 37°C (99°F). Both months experience significant humidity, with May at 79% and July rising to 89%. Precipitation is also notable; May receives about 141 mm (5.5 in) over 20 days, whereas July has a slightly lower total of 120 mm (4.7 in) spread over 22 days. For more on weather specifics, visit Ratchaburi weather in July.

May and August exhibit noteworthy differences in weather patterns. In May, temperatures range from a minimum of 24°C (75°F) to a maximum of 40°C (105°F), with an average of 30°C (87°F). The month experiences significant rainfall, totaling 141 mm (5.5 in) over about 20 days, alongside relatively high humidity at 79%. In contrast, August presents slightly cooler temperatures, with an average of 29°C (84°F) and a maximum of 37°C (99°F). However, it sees increased precipitation, totaling 167 mm (6.6 in) over 25 days, and even higher humidity at 90%. For a more detailed look at August's weather, you can visit Ratchaburi weather in August.

In comparing the weather between May and September, we find that both months start with similar minimum temperatures, hovering around 24°C (75°F). However, May experiences slightly warmer average high temperatures of 30°C (87°F), peaking at 40°C (105°F), while September has a more moderate average of 29°C (84°F) and a maximum of 37°C (100°F). Precipitation levels are notably higher in September, with 209 mm (8.2 in) over 24 days compared to May's 141 mm (5.5 in) over 20 days. Additionally, September tends to be more humid, at 87%, compared to May's 79%. For more detailed information on the weather specifics, check out Ratchaburi weather in September.

When comparing the weather in May and October, it's clear that both months experience relatively warm temperatures, but October is generally cooler. In May, temperatures range from a minimum of 24°C (75°F) to an average of 30°C (87°F), peaking at a maximum of 40°C (105°F). Contrastingly, October sees slightly lower temperatures, with a minimum of 23°C (73°F) and an average of 28°C (83°F), with a maximum of 35°C (95°F).

Precipitation is also more pronounced in October, with total rainfall reaching 202 mm (7.9 in) over 21 days, compared to May's 141 mm (5.5 in) over 20 days. The humidity levels increase slightly in October to 83%, as opposed to 79% in May. For a more detailed look at October weather in Ratchaburi, you can visit Ratchaburi weather in October.

In comparing the weather of May and November, May is notably warmer, with average temperatures reaching up to 30°C (87°F) and maximums often hitting 40°C (105°F). Additionally, May experiences higher precipitation, with 141 mm (5.5 in) over 20 days, contributing to its significant humidity level of 79%. On the other hand, November brings milder conditions, featuring an average temperature of 27°C (81°F) and maximums of 34°C (93°F). The month is also drier, with only 83 mm (3.3 in) of rain spread over 10 days and a slightly lower humidity at 77%. For more detailed information, you can check Ratchaburi weather in November.

May and December in Ratchaburi showcase a significant contrast in weather conditions. May is characterized by high temperatures, with a minimum of 24°C and an average reaching 30°C, peaking at 40°C. The month experiences considerable rainfall, with 141 mm distributed over 20 days, leading to a humidity level of 79%. In contrast, December boasts cooler temperatures, where the minimum drops to 16°C and average temperatures are around 26°C, with a maximum of 35°C. Additionally, December sees much less precipitation, only 17 mm over 3 days, and a lower humidity of 66%. For more detailed information, you can check out Ratchaburi weather in December.

Compare Ratchaburi's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Ratchaburi

As May unfolds in Ratchaburi, the weather distinguishes itself from other months with its intense heat and high humidity, creating a sultry atmosphere that feels both oppressive and invigorating. With temperatures soaring up to 40°C, the month is marked by a dramatic increase in precipitation, averaging around 141 mm over 20 days, which brings much-needed relief from the heat. This combination of warmth and moisture not only influences outdoor activities but also enriches the lush scenery characteristic of this vibrant region. For a deeper dive into the fascinating weather patterns throughout the year, visit Ratchaburi Climate.