Expand
Contents
- The climate of Ratnapura
- The best time to visit Ratnapura
- The worst time to visit Ratnapura
- Spring weather in Ratnapura
- Summer weather in Ratnapura
- Autumn weather in Ratnapura
- Winter weather in Ratnapura
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Ratnapura
Occupying a place in the tropics, Ratnapura, Sri Lanka, is subjected to the climate system branded by Köppen as Af, the Tropical Rainforest climate. This system is known for its high temperatures throughout the year and an abundance of rainfall.
The temperatures in Ratnapura are consistently warm, varying minimally between 27.3°C (81.1°F) and 31.1°C (88°F) at their peak and 18.7°C (65.7°F) to 21.8°C (71.2°F) for lows over the course of the year. Their stable nature is due to the town's geographical location close to the equator, which ensures a nearly constant length of the day, deviating between 11.7 hours to 12.5 hours of daylight.
Moving to moisture variables, the relative humidity of this tropical paradise remains fairly high, fluctuating within the confines of 80% to 88%. On the matter of precipitation, each month experiences significant rainfall, ranging right from 85mm (3.35") in February to a soaking 356mm (14.02") in October. The number of rain-affected days corresponds appropriately with these amounts, reaching its peak in May, with about 30 days, and receding to lows around 19-20 days in the drier months.
Climate characterization would not be complete without considering atmospheric pressure, visibility, wind aspects and solar exposure. The pressure fluctuates minimally, with values spanning from 1008.6mb to 1011.6mb over the year. Visibility is, on average, a comfortable 7km (4.3mi) to 8km (5mi), while the wind maintains a calm profile, registering measurements in the region of 4.2km/h (2.6mph) to 8.8km/h (5.5mph). Monthly sunshine duration shifts from a low of 6.2 hours in August to highs of 8.4 hours in April. However, the UV index remains steady at 6 throughout.
The temperatures in Ratnapura are consistently warm, varying minimally between 27.3°C (81.1°F) and 31.1°C (88°F) at their peak and 18.7°C (65.7°F) to 21.8°C (71.2°F) for lows over the course of the year. Their stable nature is due to the town's geographical location close to the equator, which ensures a nearly constant length of the day, deviating between 11.7 hours to 12.5 hours of daylight.
Moving to moisture variables, the relative humidity of this tropical paradise remains fairly high, fluctuating within the confines of 80% to 88%. On the matter of precipitation, each month experiences significant rainfall, ranging right from 85mm (3.35") in February to a soaking 356mm (14.02") in October. The number of rain-affected days corresponds appropriately with these amounts, reaching its peak in May, with about 30 days, and receding to lows around 19-20 days in the drier months.
Climate characterization would not be complete without considering atmospheric pressure, visibility, wind aspects and solar exposure. The pressure fluctuates minimally, with values spanning from 1008.6mb to 1011.6mb over the year. Visibility is, on average, a comfortable 7km (4.3mi) to 8km (5mi), while the wind maintains a calm profile, registering measurements in the region of 4.2km/h (2.6mph) to 8.8km/h (5.5mph). Monthly sunshine duration shifts from a low of 6.2 hours in August to highs of 8.4 hours in April. However, the UV index remains steady at 6 throughout.
The best time to visit Ratnapura
For visitors to Ratnapura wishing to encounter more sunshine and minimal precipitation, the winter months of December to February present themselves as the best period. During this time, sunshine averages increase to approximately 8.3 hours per day, while the rainfall subsides to between 85mm (3.35") and 134mm (5.28"). The number of rainfall-affected days falls to the 19-26 days range, precipitating fewer disruptions to outdoor adventures.
The worst time to visit Ratnapura
Conversely, the period from May to October could present challenges for travelers due to a surge in rainfall. The precipitation amount builds up to a high, peaking at 357mm (14.06") in October. This uptick in rainfall is accompanied by overcast conditions, resulting in fewer hours of sunshine, ranging from 6.2 hours to 7.1 hours per day.
Spring weather in Ratnapura
The spring months in Ratnapura are characterized by temperatures hovering between 19.7°C (67.5°F) and 30.7°C (87.3°F), and steady rainfall ranging from 109mm (4.29") to 250mm (9.84"). The city experiences daylight for roughly 12.1 hours to 12.5 hours per day, with a corresponding sunshine exposure varying from 8.3 hours in March to 7.6 hours in May.
Summer weather in Ratnapura
Summer, extending from June to August, records temperature highs of 27.5°C (81.5°F) and lows of 21.3°C (70.3°F) to 21.8°C (71.2°F). This season is the most humid, with relative humidity hitting the 88% mark. Rainfall is high, placing between 162mm (6.38") and 270mm (10.63"), and the number of rainy days lies around 28-29.
Autumn weather in Ratnapura
In autumn, spanning from September to November, temperatures experience a subtle dip with the daily maxima fluctuating between 27.5°C (81.5°F) and 28.5°C (83.3°F) and minima between 20.8°C (69.4°F) and 20.9°C (69.6°F). Precipitation dominates the scene, reaching its peak at 357mm (14.06") accompanied by approximately 28 days with rainfall.
Winter weather in Ratnapura
In the winter months from December to February, the city experiences decreased rain, with levels dropping to 85mm (3.35") in December and gradually increasing to 134mm (5.28") by March. The chill is subtly felt with temperature lows sitting at 18.7°C (65.7°F) to 19.9°C (67.8°F) and highs stretching from 28.4°C (83.1°F) to 30.7°C (87.3°F). With sunshine casting its rays for about 6 to 8.3 hours a day and fewer rainfall days, winter bestow Ratnapura with an agreeable charm.
Weather in January
With temperatures typically peaking at 29.3°C (84.7°F) and hitting lows of approximately 18.8°C (65.8°F), January in Ratnapura, Sri Lanka, boasts a favoured warm environment. This month witnesses relative humidity lingering around an average of 80%, embellishing the sultry air so characteristic of this part of the globe. Weather in January »
Weather in February
Ratnapura's climate transitions subtly from January to February. Although minor, a rise in the temperature up to about 30.7°C (87.3°F) marks the changeover. Rainfall continues to embellish the weather spectrum of Ratnapura in February, with an average of 109mm (4.29") precipitation deposited over 19.8 days of the month. Weather in February »
Weather in March
A continuation of February's trend, March ushers slightly greater warmth to Ratnapura. However, this is also the month that we begin to observe a climb in rainfall figures, reaching an average of 134mm (5.28") spread across a significant 26.3 days. Weather in March »
Weather in April
Ratnapura greets April with increased heat, temperatures peaking around 30°C (86°F). A significant surge in rainfall leaves 248mm (9.76") drenched across almost all the days of April. The city also witnesses a dramatic reduction in sunshine hours, marking a stark transition. Weather in April »
Weather in May
In May, Ratnapura's weather attributes seem to coalesce around a theme of 'increased'. The temperature does see a slight drop, dipping to an average high of 28.3°C (82.9°F), but everything else on the climatologic front seems to rise. Weather in May »
Weather in June
June brings about a gradual transition in the weather outlook of Ratnapura. It ushers in slightly cooler temperatures, gustier winds, and marginally less rainfall compared to May. Visible sunlight recedes further with only a paltry average of 0.6 days intruding through the clouds. Weather in June »
Weather in July
A general pattern of consistency is noticed as the city of Ratnapura moves into July. Temperatures hover around the high 20s in°C adding to the overall scenic setting of this tropical city. Particular attention is drawn to the wind trends, with this month experiencing the highest average wind speeds of 8.8km/h (5.5mph). Weather in July »
Weather in August
In August, Ratnapura experiences a slight dip in the temperature compared to the preceding month, alongside a marginal decrease in average wind speeds. The number of rainy days average at a steady 28.8 days, yet another carryover from July. Weather in August »
Weather in September
The march of the calendar to September brings a cooler climate to Ratnapura, with temperatures mirroring those of August. Regardless, the monsoon influence begins to recede, resulting in somewhat less rainfall spread across slightly fewer days. Weather in September »
Weather in October
October stands out from the lot by encountering the highest rainfall levels of 357mm (14.06") in Ratnapura's annual weather pattern. Temperatures maintain an average high of 28.5°C (83.3°F), while the high humidity associated with monsoons prevails. Weather in October »
Weather in November
The end of the monsoon months is signaled by the arrival of November, albeit with an impressive average rainfall of 313mm (12.32"). This roomy, tropical city of Ratnapura, sticks to a similar pattern of temperature and humidity level as experienced in October. Weather in November »
Weather in December
Ratnapura concludes the weather cycle with December, offering some relief from the high precipitation rates of previous months. Boasting a moderate temperature range between 28.4°C (83.1°F) high and 19.9°C (67.8°F) low, along with a mild wind speed of 4.3km/h (2.7mph), adaptation to December's weather comes naturally. Weather in December »
Updated: Feb 6, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the least humid months in Ratnapura?
The months with the lowest humidity in Ratnapura are January and February, with an average relative humidity of 80%.
What is the driest month in Ratnapura?
January is the month with the least rainfall in Ratnapura. Rain falls for 18.9 days and accumulates 85mm (3.35") of precipitation.
How many days does it rain in Ratnapura?
In Ratnapura, during the entire year, the rain falls for 317.3 days and collects up to 2422mm (95.35") of precipitation.
When is the highest UV index in Ratnapura?
January through August, November and December, with an average maximum UV index of 6, are months with the highest UV index.
What is the warmest month in Ratnapura?
The warmest period tends to be March, when average temperatures fluctuate between a high of 31.1°C (88°F) and a low of 19.7°C (67.5°F).
What month has the most sunshine in Ratnapura?
April has the most sunshine of the year, with an average of 8.4h of sunshine.
What is the most humid month in Ratnapura?
The months with the highest humidity in Ratnapura are May and June, with an average relative humidity of 88%.
What is the coldest month in Ratnapura?
June and July are identified as the coldest months, with an average high-temperature of 27.3°C (81.1°F).
When are the longest days in Ratnapura?
With an average of 12h and 30min of daylight, June has the longest days of the year.
What is the month with the lowest UV index in Ratnapura?
The months with the lowest UV index in Ratnapura are September and October, with an average maximum UV index of 5.
What is the wettest month in Ratnapura?
October is the month with the most rainfall. Rain falls for 28.5 days and accumulates 357mm (14.06") of precipitation.
What is the month with the shortest days in Ratnapura?
The month with the shortest days in Ratnapura, Sri Lanka, is December, with an average of 11h and 42min of daylight.
Is there Daylight Saving Time (DST) in Ratnapura?
Ratnapura, Sri Lanka, does not utilize Daylight Saving Time (DST). +0530 timezone is used over the entire year.
What is the month with the least sunshine in Ratnapura?
The month with the least sunshine is December, with an average of 6h of sunshine.
Average temperature
Ratnapura, Sri Lanka
The warmest month (with the highest average high temperature) is March (31.1°C).
The months with the lowest average high temperature are June and July (27.3°C).
The months with the highest average low temperature are May and June (21.8°C).
The coldest month (with the lowest average low temperature) is February (18.7°C).
Average pressure
Ratnapura, Sri Lanka
- Average pressure in January:
1011.6mbar - Average pressure in February:
1011.3mbar - Average pressure in March:
1010.8mbar - Average pressure in April:
1009.8mbar - Average pressure in May:
1008.6mbar - Average pressure in June:
1008.7mbar
- Average pressure in July:
1008.8mbar - Average pressure in August:
1009.1mbar - Average pressure in September:
1009.8mbar - Average pressure in October:
1010mbar - Average pressure in November:
1009.9mbar - Average pressure in December:
1010.4mbar
The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.6mbar).
Average wind speed
Ratnapura, Sri Lanka
- Average wind speed in January:
4.2km/h - Average wind speed in February:
3.9km/h - Average wind speed in March:
3.9km/h - Average wind speed in April:
4.3km/h - Average wind speed in May:
6.5km/h - Average wind speed in June:
8.7km/h
- Average wind speed in July:
8.8km/h - Average wind speed in August:
8.4km/h - Average wind speed in September:
7.4km/h - Average wind speed in October:
5.8km/h - Average wind speed in November:
4.2km/h - Average wind speed in December:
4.3km/h
The windiest month (with the highest average wind speed) is July (8.8km/h).
The calmest months (with the lowest average wind speed) are February and March (3.9km/h).
Average humidity
Ratnapura, Sri Lanka
The months with the highest relative humidity are May and June (88%).
The months with the lowest relative humidity are January and February (80%).
Average rainfall
Ratnapura, Sri Lanka
- Average rainfall in January:
85mm - Average rainfall in February:
109mm - Average rainfall in March:
134mm - Average rainfall in April:
248mm - Average rainfall in May:
270mm - Average rainfall in June:
173mm
- Average rainfall in July:
162mm - Average rainfall in August:
184mm - Average rainfall in September:
178mm - Average rainfall in October:
357mm - Average rainfall in November:
313mm - Average rainfall in December:
209mm
The wettest month (with the highest rainfall) is October (357mm).
The driest month (with the least rainfall) is January (85mm).
Average rainfall days
Ratnapura, Sri Lanka
- Average rainfall days in January:
18.9 days - Average rainfall days in February:
19.8 days - Average rainfall days in March:
26.3 days - Average rainfall days in April:
29.4 days - Average rainfall days in May:
29.8 days - Average rainfall days in June:
28.1 days
- Average rainfall days in July:
28.8 days - Average rainfall days in August:
28.8 days - Average rainfall days in September:
25.8 days - Average rainfall days in October:
28.5 days - Average rainfall days in November:
27.5 days - Average rainfall days in December:
25.6 days
The month with the highest number of rainy days is May (29.8 days).
The month with the least rainy days is January (18.9 days).
Average daylight / Average sunshine
Ratnapura, Sri Lanka
- Average daylight in January:
11h and 5min - Average daylight in February:
11h and 5min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 2min - Average daylight in May:
12h and 2min - Average daylight in June:
12h and 3min
- Average daylight in July:
12h and 3min - Average daylight in August:
12h and 2min - Average daylight in September:
12h and 1min - Average daylight in October:
12h and 0min - Average daylight in November:
11h and 5min - Average daylight in December:
11h and 4min
The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).
- Average sunshine in January:
8h and 2min - Average sunshine in February:
8h and 2min - Average sunshine in March:
8h and 2min - Average sunshine in April:
8h and 2min - Average sunshine in May:
7h and 4min - Average sunshine in June:
7h and 1min
- Average sunshine in July:
7h and 1min - Average sunshine in August:
6h and 1min - Average sunshine in September:
7h and 3min - Average sunshine in October:
7h and 2min - Average sunshine in November:
6h and 2min - Average sunshine in December:
6h and 0min
The month with the most sunshine is April (Average sunshine: 8h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days
Ratnapura, Sri Lanka
- Average sunshine days in January:
9.2 days - Average sunshine days in February:
6.8 days - Average sunshine days in March:
2.8 days - Average sunshine days in April:
0.2 days - Average sunshine days in May:
0.8 days - Average sunshine days in June:
0.6 days
- Average sunshine days in July:
1 days - Average sunshine days in August:
0.8 days - Average sunshine days in September:
1.4 days - Average sunshine days in October:
1.1 days - Average sunshine days in November:
1.8 days - Average sunshine days in December:
3.6 days
The month with the most sunshine days is January (9.2 days).
The month with the least sunshine days is April (0.2 days).
Average UV index
Ratnapura, Sri Lanka
The months with the highest UV index are January, February, March, April, May, June, July, August, November and December (UV index 6).
The months with the lowest UV index are September and October (UV index 5).
Average cloud cover
Ratnapura, Sri Lanka
The month with the most cloud cover is June (Cloud cover 65).
The month with the least cloud cover is January (Cloud cover 33).
Average visibility
Ratnapura, Sri Lanka
The months with the highest visibility are January, February, March, June, July, August and December (8km).
The months with the lowest visibility are April, May, September, October and November (7km).
Ratnapura, Sri Lanka
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location