Colombo Weather in May
Sri Lanka · Tropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
May in Colombo sees average temperatures ranging from a low of 25.5°C (77.9°F) to a high of 29.7°C (85.5°F), with a mean of 27.4°C (81.3°F). Compared to the annual average of 26.7°C (80.1°F), this month is 0.7°C warmer than the yearly norm. Precipitation averages 439.5mm, making it approximately 190.0mm wetter than the monthly average of 249.0mm. This is the wettest month of the year, with 439.5mm of precipitation and around 30.8 rainy days. The city receives an average of 8.3 hours of sunshine per day during May, with relative humidity averaging 85.9%. Wind speeds reach an average maximum of 19.0 km/h. For travelers, this month offers a temperature experience in Colombo, with wetter-than-average conditions compared to the rest of the year.
Colombo's tropical climate is warm and humid year-round, with two monsoon seasons. I've tracked the rainfall patterns and found that the city receives most of its rain from May to August and October to January. The best time for visiting is January to April, when the weather is drier and the coastal attractions are most enjoyable.
May vs Adjacent Months
| Metric | April | May | June |
|---|---|---|---|
| Mean Temp | 27.5°C (81.5°F) | 27.4°C (81.3°F) | 27.1°C (80.8°F) |
| Rainfall | 156.0mm | 439.5mm | 306.6mm |
| Sunshine | 10.5 hrs | 8.3 hrs | 9.5 hrs |
| Humidity | 83.5% | 85.9% | 85.4% |
| Wind | 14.0 km/h | 19.0 km/h | 19.7 km/h |
| Rainy Days | 28.8 | 30.8 | 29.8 |
Seasonal Context
May falls in Spring in the Northern Hemisphere. Spring is a transitional season with temperatures rising from winter lows. For travelers visiting Colombo in May, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Colombo in May?
The average temperature in Colombo during May ranges from 25.5°C (77.9°F) to 29.7°C (85.5°F), with a mean of 27.4°C (81.3°F).
How much does it rain in Colombo in May?
Colombo receives an average of 439.5mm of precipitation in May, spread across approximately 30.8 rainy days. This is the wettest month of the year.
What should I pack for Colombo in May?
Based on May weather data, pack lightweight, breathable clothing, sunscreen, and a hat. Rain gear is essential — this month averages 439.5mm of precipitation.
Is May a good time to visit Colombo?
May is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Colombo
Cities with Similar May Climate (Tropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 6.93°, 79.85°. Timezone: Asia/Colombo. Last updated: 2026-07-30.