Sri Lanka Colombo Weather in May — Climate Guide
May in Colombo is moderate
Colombo Weather in May — Quick Answer
As of 2026- Avg temp
- 31° / 26°
- Rainfall
- 350mm · 17 days
- Crowds
- Quiet
As of 2026, Colombo in May averages a high of 31°C and low of 26°C with 350mm of rain over about 17 days. Southwest monsoon begins — hot, very humid around 31°C/26°C with heavy, frequent rain. Light quick-dry clothing, a proper umbrella or rain jacket, and waterproof footwear. SPF for sunny breaks; a sarong for temples.
May is moderate for Colombo.
May marks the onset of the southwest monsoon in Colombo. It averages a hot, very humid 31°C/26°C with heavy rainfall (around 350mm) and frequent downpours along the west and south coasts.
The cultural high point is Vesak — the May full-moon Poya celebrating the Buddha's birth, enlightenment, and passing. Colombo glows with paper lanterns, illuminated 'pandals' (story-boards in lights), and free dansala food stalls run by volunteers. It's the most beautiful festival to witness in the city, even in the rain.
Travel score
Colombo May Weather Stats
Avg High
31°C
Avg Low
26°C
Rainy Days
17
350mm total
Sunshine
6.5h
Daily avg
Humidity
80%
muggy
UV Index
11
Extreme
Wind
13 km/h
Gusts 26
Crowds
Quiet
At attractions
May Sunrise & Sunset
Air Quality
PM2.5
18 μg/m³
PM10
34 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
37°C
Nighttime
28°C
Humidity and wind affect how the actual temperature feels.
Wind
13 km/h
Max gust 26 km/h
Activities Recommended for May
May Travel Pros & Cons
Pros
- Vesak festival — lanterns and dansala food stalls
- Low-season prices and fewer crowds
- East coast (Trincomalee/Arugam Bay) season opens
- Sunny windows still appear between showers
Cons
- Southwest monsoon brings heavy rain
- West/south coasts and Galle are wet
- Very high humidity
- Outdoor plans easily disrupted
May Events & Festivals
- Southwest monsoon (Yala) begins — heavy rain on the west/south coasts
- Vesak Poya (May full moon) — biggest Buddhist festival; lanterns, pandals, free dansala food stalls
- Low season — softer hotel prices
- East coast (Trincomalee, Arugam Bay) season opens
Colombo in May — Full Picture
May marks the onset of the southwest monsoon in Colombo. It averages a hot, very humid 31°C/26°C with heavy rainfall (around 350mm) and frequent downpours along the west and south coasts.
The cultural high point is Vesak — the May full-moon Poya celebrating the Buddha's birth, enlightenment, and passing. Colombo glows with paper lanterns, illuminated 'pandals' (story-boards in lights), and free dansala food stalls run by volunteers. It's the most beautiful festival to witness in the city, even in the rain.
This is low season for the west coast, so hotel prices soften and crowds thin. Showers are often intense but can clear, leaving sunny windows.
Note: if you want beaches and dry weather now, head to the east coast (Trincomalee, Arugam Bay), which has its dry season May-September — the opposite of Colombo. Pack proper rain gear.
What to Wear & What to Pack
Southwest monsoon begins — hot, very humid around 31°C/26°C with heavy, frequent rain. Light quick-dry clothing, a proper umbrella or rain jacket, and waterproof footwear. SPF for sunny breaks; a sarong for temples.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current31.7°C
25°C
13/mo
Summer (Jun·Jul·Aug)
30°C
26°C
12/mo
Autumn (Sep·Oct·Nov)
30°C
24.3°C
16/mo
Winter (Dec·Jan·Feb)
30.7°C
23°C
8.3/mo
Colombo Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 31° | 23° | 8d·60mm | 8h | 75% | 11 | Busy | Peak |
| February (Best) | 31° | 23° | 6d·70mm | 9h | 73% | 12 | Busy | Peak |
| March (Best) | 32° | 24° | 8d·110mm | 8.5h | 75% | 12 | Busy | Shoulder |
| 32° | 25° | 14d·230mm | 7.5h | 78% | 12 | Moderate | Shoulder | |
| 31° | 26° | 17d·350mm | 6.5h | 80% | 11 | Quiet | Low season | |
| 30° | 26° | 15d·220mm | 6.5h | 79% | 11 | Quiet | Low season | |
| 30° | 26° | 11d·135mm | 7h | 78% | 11 | Moderate | Shoulder | |
| 30° | 26° | 10d·110mm | 7.5h | 77% | 11 | Moderate | Shoulder | |
| 30° | 25° | 12d·160mm | 7h | 78% | 11 | Quiet | Low season | |
| 30° | 24° | 19d·350mm | 6h | 80% | 11 | Quiet | Low season | |
| 30° | 24° | 17d·320mm | 6.5h | 80% | 11 | Moderate | Shoulder | |
| December (Best) | 30° | 23° | 11d·150mm | 7.5h | 77% | 11 | Busy | Peak |
View Other Months
Colombo May Hotel Picks
Frequently Asked Questions
Is May a good time to visit Colombo?
Colombo in May is moderate. Tourist crowds are quiet and flight/hotel prices are low season.
What's the average temperature in Colombo in May?
Colombo May averages a high of 31°C and a low of 26°C.
Does it rain much in Colombo in May?
Colombo May averages 350mm of rainfall over about 17 rainy days.
What should I wear in Colombo in May?
Southwest monsoon begins — hot, very humid around 31°C/26°C with heavy, frequent rain. Light quick-dry clothing, a proper umbrella or rain jacket, and waterproof footwear. SPF for sunny breaks; a sarong for temples.
What time are sunrise and sunset in Colombo in May?
Colombo May sunrise is 06:00 and sunset is 18:20, with 12h 20min of daylight.
What's the air quality like in Colombo in May?
Colombo May air quality (AQI) averages 44, rated Good. PM2.5 averages 18μg/m³.
What activities are recommended in Colombo in May?
In May, Colombo is great for Vesak lanterns and pandals (full moon), Indoor temples and the National Museum, East-coast beaches (Trincomalee/Arugam Bay).
Is May peak season in Colombo?
Colombo May crowds are quiet and prices are low season. You can travel relatively comfortably without long queues.
Best Months to Visit Colombo
View Other Months
Planning a May trip to Colombo?
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Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.