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Contents
- The climate of Mirissa
- The best time to visit Mirissa
- The worst time to visit Mirissa
- Spring weather in Mirissa
- Summer weather in Mirissa
- Autumn weather in Mirissa
- Winter weather in Mirissa
- 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 rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average UV index
A row of palm trees with boats under, along Tropical Beach in Mirissa, Sri Lanka
Climate and monthly weather forecast
The climate of Mirissa
Lying in the equatorial zone, Mirissa, Sri Lanka, experiences a Tropical rainforest climate, as identified by the Köppen climate classification. This climate type, denoted as 'Af', is best defined by the uniform and high levels of temperatures and significant rainfall distributed throughout the year.
Throughout the 12 months, daytime temperatures fluctuate moderately, ranging from a high of 30°C (86°F) to 31°C (87.8°F). Meanwhile, nighttime temperatures see a similar consistency, varying from 22°C (71.6°F) to 25°C (77°F). Hence, no significant temperature extremes exist, rendering the yearly weather typically warm to hot.
Rainfall levels show some variations throughout the year. The amounts even out between 89mm (3.5") and 305mm (12.01") per month. The number of rainfall days similarly varies, tallying between 5 and 14 days monthly. Thus, months might harbor, on one extreme, heavy rains, and on the other, less sizable amounts.
UV Index remains consistently high throughout the year with values of 11 to 12. Lastly, sunshine hours and daylight hours proffer a consistent experience of ample light, with their values fluctuating between 6 to 8 hours and 11.8 to 12.5 hours, respectively.
Throughout the 12 months, daytime temperatures fluctuate moderately, ranging from a high of 30°C (86°F) to 31°C (87.8°F). Meanwhile, nighttime temperatures see a similar consistency, varying from 22°C (71.6°F) to 25°C (77°F). Hence, no significant temperature extremes exist, rendering the yearly weather typically warm to hot.
Rainfall levels show some variations throughout the year. The amounts even out between 89mm (3.5") and 305mm (12.01") per month. The number of rainfall days similarly varies, tallying between 5 and 14 days monthly. Thus, months might harbor, on one extreme, heavy rains, and on the other, less sizable amounts.
UV Index remains consistently high throughout the year with values of 11 to 12. Lastly, sunshine hours and daylight hours proffer a consistent experience of ample light, with their values fluctuating between 6 to 8 hours and 11.8 to 12.5 hours, respectively.
The best time to visit Mirissa
Considering the slightly varied rainfall throughout the year, prospective visitors would find the driest months, January and February (with rainfall levels of 89mm (3.5") and 91mm (3.58"), respectively), as the most appealing period to visit Mirissa. Despite carrying less rainfall, these months still provide ample sunshine, with 7 to 8 sunshine hours daily, and adequately warm temperatures ranging from 22°C (71.6°F) to 30°C (86°F). The UV Index at 12, although high, remains tolerable with proper sun protection.
The worst time to visit Mirissa
In converse, October and November posting the highest rainfall levels of 305mm (12.01") and 276mm (10.87"), respectively, emerge as the least ideal months for a visit. With these monsoon months witnessing 13 to 14 rainfall days, frequent and possibly heavy rainfall can be anticipated, which might cause a hamper to travel plans.
Spring weather in Mirissa
Springtime in Mirissa, encompassing March, April, and May, is highlighted by rising temperatures and higher rainfall levels. Daytime temperatures see an increase from 30°C (86°F) to 31°C (87.8°F), while nighttime temperatures rise to a region of 24°C (75.2°F) to 25°C (77°F). Rainfall observes a steeper increase from 109mm (4.29") in March to 258mm (10.16") in May, with rainfall days surging from 7 to 11 days throughout these months.
Summer weather in Mirissa
Summer in Mirissa, which includes June, July, and August, experiences high temperatures and rainfall amounts. Both daytime and nighttime temperatures remain consistently high at 30°C (86°F) and 24°C (75.2°F) to 25°C (77°F). Rainfall ranges from 173mm (6.81") in June and July to 149mm (5.87") in August, while the number of rainfall days fluctuates between 9 days and 11 days in this period.
Autumn weather in Mirissa
Autumn, covering September, October, and November, is characterized by elevated temperatures and the highest level of rainfall. Both day and night temperatures maintain at around 29°C (84.2°F) to 30°C (86°F) and 24°C (75.2°F), respectively. Rainfall sees a significant increase from 215mm (8.46") in September to a peak of 305mm (12.01") in October before slightly dropping to 276mm (10.87") in November. Hence, autumn emerges as the rainiest season in Mirissa.
Winter weather in Mirissa
Winter months in Mirissa, comprising December, January, and February, although warm, bring about slightly weather changes. Daytime temperatures decrease marginally to span between 29°C (84.2°F) to 30°C (86°F), while nighttime temperatures oscillate between 22°C (71.6°F) and 23°C (73.4°F). Rainfall levels diminish considerably to 171mm (6.73") in December and then further to 89mm (3.5") and 91mm (3.58") in January and February, respectively.
Weather in January
January ushers in the new year in Mirissa, Sri Lanka, sustaining favorable weather conditions. While the sea temperature holds steady, there is an observable increment in sunshine hours per day. High UV ratings suggest amplified sunlight intensity, making skin protection paramount. Weather in January »
Weather in February
February affirms January's favorable conditions with heightened daylight hours. A gradual shift in extreme temperatures presents a rise in the lowest temperature. The pleasant sea temperatures persist, matching the ongoing weather pattern. Weather in February »
Weather in March
Transitioning into March, the weather retains its suitable attributes. Noteworthy is the continual increase in sea temperatures and the steady sunlight levels. The daylight hours extend slightly, indicating lengthier days. The temperature ranges in March display a mild transition from the previous month to 24°C (75.2°F) and 31°C (87.8°F) for the low and high temperatures respectively. Weather in March »
Weather in April
April witnesses a conspicuous shift in weather patterns in Mirissa, Sri Lanka. While maintaining steady high temperatures, daylight hours reach their peak. Sea temperatures register the highest value yet, indicating warmed up waters. Weather in April »
Weather in May
Although May experiences a temperature plateau, there is a sharp upturn in rainfall. The consistent sea temperatures provide an exceptional ambiance for water-related activities. Sunlight hours per day wane slightly, implying shorter days. Weather in May »
Weather in June
The onset of June introduces modest fluctuations in weather by the decreasing daylight hours. Monthly extreme temperatures hold steady, corroborated by the constant UV index. Sea temperatures remain consistent with the past months, sustaining a conducive seaside environment. Weather in June »
Weather in July
A minute reduction in maximal temperature differentiates July from the preceding month. Meanwhile, sea temperatures remain unchanged, affirming stable conditions for marine activities. Lower daylight hours serve as a reminder of shorter days. Weather in July »
Weather in August
In August, weather trends from the previous month persist. This period sees the last of the high UV index readings for the year, signaling a slight decrease in sunlight intensity. Although sea and extreme temperatures devices no noticeable changes, there is a modest reduction in the amount of sunshine per day. Weather in August »
Weather in September
September features a cool milieu, demonstrated by a minor drop in maximal temperature. As daylight hours recede, so do the sea temperatures match that trend. The reducing UV index reflects a lower sunlight intensity, signalling a transition in weather patterns. Weather in September »
Weather in October
October brings more fluctuations in temperature and rainfall. The end of the high UV index readings coincides with the tapering daylight hours. Sea temperatures keep their unchanging course, complementing the ongoing conditions. Even so, October stands out with rainfall escalating to 305mm (12.01") over 13 days, marking the most precipitous phase in the timeline. Temperatures reach their minimum during August through October and December, recording an average high-temperature of 29°C (84.2°F). The month with the most rainfall in Mirissa, Sri Lanka, is October, when the rain falls for 13 days and typically aggregates up to 305mm (12.01") of precipitation. Weather in October »
Weather in November
November witnesses relatively cooler periods with a decline in the highest temperature. Reduced daylight hours coupled with a lower UV index give way to lesser sunlight intensity. However, sea temperatures pick up slightly, defying the existing conditions. Weather in November »
Weather in December
December concludes the yearly weather cycle with a slight dip in temperature highs. The downward trend in daylight hours subsides at last, consistent with the preceding month. Sea temperatures follow suit with the recent slight uplift. 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 is the driest month in Mirissa?
The month with the least rainfall is January, when the rain falls for 5 days and typically collects 89mm (3.5") of precipitation.
How much does it rain in Mirissa?
In Mirissa, during the entire year, the rain falls for 116 days and collects up to 2216mm (87.24") of precipitation.
What months are the sea coldest in Mirissa?
The months with the coldest seawater in Mirissa, Sri Lanka, are January, February, June through October and December, with an average sea temperature of 28°C (82.4°F).
When is the highest UV index in Mirissa?
January through October, with an average maximum UV index of 12, are months with the highest UV index in Mirissa, Sri Lanka.
What are the months with the most sunshine in Mirissa?
The months with the most sunshine in Mirissa, Sri Lanka, are February and March, with an average of 8h of sunshine.
What part of the year is the hottest in Mirissa?
March and April are identified as the warmest months in Mirissa, Sri Lanka, with an average high-temperature of 31°C (87.8°F).
What month is the sea warmest in Mirissa?
With an average sea temperature of 30°C (86°F), April is the month with the warmest seawater.
What is the month with the least sunshine in Mirissa?
May through December, with an average of 6h of sunshine, are months with the least sunshine.
When are the longest days in Mirissa?
The month with the longest days in Mirissa, Sri Lanka, is June, with an average of 12h and 30min of daylight.
What is the coldest time of year in Mirissa?
August through October and December bring Mirissa's average lowest temperatures, reaching a high of 29°C (84.2°F).
What is the rainiest month in Mirissa?
The month with the most rainfall is October, when the rain falls for 13 days and typically aggregates up to 305mm (12.01") of precipitation.
When is the lowest UV index in Mirissa?
The months with the lowest UV index in Mirissa, Sri Lanka, are November and December, with an average maximum UV index of 11.
What is the month with the shortest days in Mirissa?
The month with the shortest days in Mirissa, Sri Lanka, is December, with an average of 11h and 48min of daylight.
Is there Daylight Saving Time (DST) in Mirissa?
Mirissa, Sri Lanka, does not utilize Daylight Saving Time (DST). +0530 timezone is used over the entire year.
Average temperature
Mirissa, Sri Lanka
The warmest months (with the highest average high temperature) are March and April (31°C).
The months with the lowest average high temperature are August, September, October and December (29°C).
The months with the highest average low temperature are May and June (25°C).
The coldest month (with the lowest average low temperature) is January (22°C).
Average rainfall
Mirissa, Sri Lanka
- Average rainfall in January:
89mm - Average rainfall in February:
91mm - Average rainfall in March:
109mm - Average rainfall in April:
207mm - Average rainfall in May:
258mm - Average rainfall in June:
173mm
- Average rainfall in July:
173mm - Average rainfall in August:
149mm - Average rainfall in September:
215mm - Average rainfall in October:
305mm - Average rainfall in November:
276mm - Average rainfall in December:
171mm
The wettest month (with the highest rainfall) is October (305mm).
The driest month (with the least rainfall) is January (89mm).
Average rainfall days
Mirissa, Sri Lanka
- Average rainfall days in January:
5 days - Average rainfall days in February:
5 days - Average rainfall days in March:
7 days - Average rainfall days in April:
11 days - Average rainfall days in May:
11 days - Average rainfall days in June:
11 days
- Average rainfall days in July:
9 days - Average rainfall days in August:
9 days - Average rainfall days in September:
11 days - Average rainfall days in October:
13 days - Average rainfall days in November:
14 days - Average rainfall days in December:
10 days
The month with the highest number of rainy days is November (14 days).
The months with the least rainy days are January and February (5 days).
Average sea temperature
Mirissa, Sri Lanka
The best month for swimming (with the highest average sea temperature) is April (30°C).
The coldest months (with the lowest average sea temperature) are January, February, June, July, August, September, October and December (28°C).
Average daylight / Average sunshine
Mirissa, 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 2min - 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 5min
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 48min).
The months with the most sunshine are February and March (Average sunshine: 8h).
The months with the least sunshine are May, June, July, August, September, October, November and December (Average sunshine: 6h).
Average UV index
Mirissa, Sri Lanka
The months with the highest UV index are January, February, March, April, May, June, July, August, September and October (UV index 12).
The months with the lowest UV index are November and December (UV index 11).
