Your May weather guide
WarmWeather in Mellieha in May
May is a good time for Mellieha if you want warm, mostly dry weather rather than summer heat. Daytime highs average 20°C, with about 2 rainy days across the month, so it suits spending time outdoors without planning everything around the heat. The catch is the sea: at 18.5°C, it is bracing rather than comfortably warm. Pack for mild days and cooler evenings, and treat swimming as an option rather than the main reason to go.
Long-term climate averages for Mellieħa, not a forecast · 1991-2020
Mellieha, month by month
Your snapshot
At a glance
The useful details for Mellieħa.
- Average daytime high
- 20.1°C
- 9 in 10 days stay below 23°C
- Average night-time low
- 16.5°C
- coldest 10% of nights: 14°C or lower
- Compared with London
- +3.5°C
- London averages 16.6°C in May
- Sea temperature
- 18.5°C
- year to year: 18°C to 19°C
- Sunshine per day (est.)
- 9.9h
- 71% of 13.9 h of daylight
- Rainy days (1 mm+)
- 2
- 6 mm over the month
- Humidity
- 77%
- Days over 25°C
- 1%
- none over 30°C
- Record high 1991-2020
- 29.5°C
- 2020-05-17
- Record low 1991-2020
- 10.9°C
- 1992-05-02
- Flight from London
- ≈ 3 h 18 min
- 2048 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How May compares
May is the 6th warmest month of the year in Mellieha. Within Malta it is 4th of 4 (Malta in May). Against London's average high of 16.6°C in May, Mellieha is 3.5°C warmer by day and 8.2°C warmer at night.
Daytime and night-time in May
The typical May day in Mellieha peaks at 20.1°C, but that is an average: the warmest 10% of days reach 22.6°C or more. Roughly 1 in 83 days top 25°C. Nights average 16.5°C; one night in ten drops to 14.1°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest May day here reached 29.5°C (2020-05-17) and the coldest night 10.9°C (1992-05-02).
Rain in May
Dry (3 rainy days or fewer): about 2 days with 1 mm or more, 6 mm in total. Year to year it varies a lot - the wettest May was 1992 with 26 mm, the driest 1995 with 0 mm. Humidity averages 77%.
Sea temperature in May
The sea averages 18.5°C - bracing (18-22°c). Depending on the year it ranges from 17.9°C to 19.2°C. For the warmest sea here, come in August (26.6°C).
Sunshine and daylight
Around 9.9 hours of sunshine a day (estimated from cloud cover), 13.9 hours of daylight: the sun rises about 05:57 and sets about 20:01 local time in mid-May. Average cloud cover is 29%.
Is May a good time to visit Mellieha?
It is a reasonable choice: warm days. The best months for Mellieha on our scoring are July, June, August; months averaging 25°C or more: Jul, Aug, Sep.
Comfortable days, but keep an evening layer
Mellieha in May suits travellers who prefer gentle warmth to hot afternoons. Light clothing is a sensible starting point during the day, but bring a jumper or light jacket for evenings: the average night low is 16.5°C. The colder nights can fall to 14.1°C or below, so packing only summer clothes would be optimistic. Even the warmer days are generally moderate, with the warmest 10% reaching 22.6°C or more. You do not need to build your plans around avoiding intense midday heat, though shade and sun protection still make sense. Choose May for comfortable outdoor time, not guaranteed hot-weather lounging.
Plenty of sunshine, with a cooler sea
Rain is unlikely to dominate a May stay, with about 2 rainy days in the month. That makes outdoor plans a reasonable bet, although a dry month is not a promise of an entirely dry holiday. Around 9.9 hours of sunshine within 13.9 hours of daylight gives you plenty of scope to spend time outside without squeezing everything into midday. The sea is the more significant compromise. Its average temperature is 18.5°C, with a year-to-year range of 18°C to 19°C, so expect a bracing dip rather than water you can comfortably linger in. May works better for travellers who value sunshine and dry weather over warm-water swimming.
A little perspective
Mellieha through the year
May is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 14.2°C | 11.6°C | 16.1°C | 5.2 | 56 | 9 | 0% |
| February | 14.0°C | 11.1°C | 15.2°C | 6.1 | 52 | 8 | 0% |
| March | 15.1°C | 12.1°C | 15.2°C | 7.2 | 32 | 6 | 0% |
| April | 17.0°C | 13.7°C | 16.1°C | 8.3 | 16 | 4 | 0% |
| MaySelected | 20.1°C | 16.5°C | 18.5°C | 9.9 | 6 | 2 | 1% |
| Junebest | 24.0°C | 19.9°C | 22.2°C | 12.2 | 3 | 1 | 31% |
| Julybest | 26.8°C | 22.6°C | 25.2°C | 13.7 | 0 | 0 | 89% |
| Augustbest | 27.8°C | 23.7°C | 26.6°C | 12.4 | 3 | 1 | 99% |
| September | 25.6°C | 22.3°C | 25.7°C | 8.9 | 32 | 4 | 66% |
| October | 22.8°C | 19.7°C | 23.8°C | 6.5 | 52 | 7 | 10% |
| November | 19.2°C | 16.4°C | 21.1°C | 5.3 | 69 | 9 | 0% |
| December | 15.9°C | 13.3°C | 18.1°C | 4.9 | 73 | 10 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in May
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Mellieha in May FAQs
Plain answers, grounded in the averages.
Is Mellieha hot in May?
Mellieha is warm in May: the average daytime high is 20.1°C and nights average 16.5°C. Roughly 1 in 83 May days reach 25°C.
Can you swim in the sea in Mellieha in May?
The sea around Mellieha averages 18.5°C in May, which is bracing - fine for a quick dip, cool for long swims. Between 1991 and 2020 it ranged from 18°C to 19°C depending on the year.
How much does it rain in Mellieha in May?
Mellieha sees about 2 rainy days (1 mm or more) and 6 mm of rain in a typical May. The wettest May between 1991 and 2020 was 1992 (26 mm) and the driest was 1995 (0 mm).
How sunny is Mellieha in May?
Mellieha gets around 9.9 hours of sunshine a day in May out of 13.9 hours of daylight (estimated from average cloud cover).
How does Mellieha compare with the UK in May?
Mellieha is on average 3.5°C warmer than London by day in May (20.1°C against 16.6°C).
What is the hottest May on record in Mellieha?
Between 1991 and 2020 the hottest May day in Mellieha reached 29.5°C on 2020-05-17, and the coldest night dropped to 10.9°C on 1992-05-02.
How much warmer is Mellieha than London in May?
Mellieha's average daytime high is 20.1°C, compared with 16.6°C in London, a difference of 3.5°C. That is a useful step up in warmth, but not a jump into midsummer conditions. You will still want a layer for evenings.
Can I expect hot weather in May?
Expect warmth rather than heat. Only 1% of days reach 25°C, while the share reaching 30°C is 0%. May is better suited to comfortable days outdoors than to a holiday that depends on consistently hot afternoons.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Mellieħa. Sea temperature from the nearest 5 km sea cell, 2.3 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C