Your April weather guide
MildWeather in Kos in April
Kos in April suits a mild-weather holiday rather than a beach break built around swimming. Daytime highs average about 18°C, the sea is a cold 17°C, and there are about 6 rainy days during the month. Expect more warmth than London, but not dependable summer heat. Go if you prefer being outdoors without getting too hot and can keep plans flexible; choose a warmer month if swimming is central to your holiday.
Long-term climate averages for Kos Town, not a forecast · 1991-2020
Kos, month by month
Your snapshot
At a glance
The useful details for Kos Town.
- Average daytime high
- 17.6°C
- 9 in 10 days stay below 20°C
- Average night-time low
- 14.5°C
- coldest 10% of nights: 12°C or lower
- Compared with London
- +4.1°C
- London averages 13.5°C in April
- Sea temperature
- 17.0°C
- year to year: 16°C to 18°C
- Sunshine per day (est.)
- 8.4h
- 65% of 13.0 h of daylight
- Rainy days (1 mm+)
- 6
- 39 mm over the month
- Humidity
- 73%
- Days over 25°C
- 1%
- none over 30°C
- Record high 1991-2020
- 26.4°C
- 2018-04-26
- Record low 1991-2020
- 7.0°C
- 1997-04-10
- Flight from London
- ≈ 4 h 6 min
- 2683 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 April compares
April is the 8th warmest month of the year in Kos and ranks 95th of 134 destinations we compare for April - see where else is hot in April. Within Greece it is 22nd of 44 (Greece in April). Against London's average high of 13.5°C in April, Kos is 4.1°C warmer by day and 9.4°C warmer at night.
Daytime and night-time in April
The typical April day in Kos peaks at 17.6°C, but that is an average: the warmest 10% of days reach 19.8°C or more. Roughly 1 in 167 days top 25°C. Nights average 14.5°C; one night in ten drops to 12.1°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest April day here reached 26.4°C (2018-04-26) and the coldest night 7.0°C (1997-04-10).
Rain in April
Some rain (4-8 rainy days): about 6 days with 1 mm or more, 39 mm in total. Year to year it varies a lot - the wettest April was 2019 with 98 mm, the driest 2007 with 4 mm. Humidity averages 73%.
Sea temperature in April
The sea averages 17.0°C - too cold for most (under 18°c). Depending on the year it ranges from 16.2°C to 17.7°C. For the warmest sea here, come in August (25.2°C).
Sunshine and daylight
Around 8.4 hours of sunshine a day (estimated from cloud cover), 13.0 hours of daylight: the sun rises about 06:37 and sets about 19:45 local time in mid-April. Average cloud cover is 35%.
Is April a good time to visit Kos?
April is not the strongest month here: mild days. The best months for Kos on our scoring are August, July, June; months averaging 25°C or more: Jul, Aug, Sep.
Comfortable daytime weather, but pack for cooler spells
The average daytime high is 4.1°C above London's in April, so Kos offers a noticeable lift in warmth without a big jump into heat. Even the warmest 10% of days reach 19.8°C or more, while days reaching 25°C are rare. That makes April a reasonable choice for travellers who find hot afternoons tiring, but a less reliable option for lounging in swimwear. Nights average 14.5°C, with the coldest 10% falling to 12.1°C or below. Pack light layers for daytime, long trousers and a jumper or light jacket for evenings. Leave room to adjust what you wear rather than packing as though summer has already arrived.
Useful sunshine, with rain and a cold sea as the catches
April brings about 8.4 hours of sunshine a day within 13 hours of daylight, giving you plenty of scope for outdoor plans. That does not mean uninterrupted sun: with about 6 rainy days, a light waterproof is sensible, and it helps to leave outdoor plans flexible. The bigger limitation for a beach-focused trip is the water. At an average of 17°C, the sea is cold rather than merely refreshing, and its year-to-year range of 16°C to 18°C offers little reassurance for swimmers who dislike cold water. Treat time by the sea as weather-dependent, and do not make comfortable, lingering swims the deciding reason to book April.
A little perspective
Kos through the year
April 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 | 14.0°C | 11.3°C | 17.5°C | 5.2 | 163 | 12 | 0% |
| February | 14.2°C | 11.2°C | 16.7°C | 5.8 | 127 | 12 | 0% |
| March | 15.4°C | 12.5°C | 16.4°C | 7.0 | 74 | 8 | 0% |
| AprilSelected | 17.6°C | 14.5°C | 17.0°C | 8.4 | 39 | 6 | 1% |
| May | 21.0°C | 17.8°C | 19.4°C | 10.4 | 16 | 3 | 5% |
| Junebest | 24.8°C | 21.7°C | 22.2°C | 13.3 | 2 | 1 | 41% |
| Julybest | 26.8°C | 23.9°C | 23.8°C | 14.1 | 0 | 0 | 87% |
| Augustbest | 27.4°C | 24.6°C | 25.2°C | 13.2 | 0 | 0 | 94% |
| September | 25.3°C | 22.5°C | 24.5°C | 11.1 | 15 | 2 | 57% |
| October | 22.3°C | 19.5°C | 22.8°C | 8.1 | 60 | 5 | 8% |
| November | 18.8°C | 15.9°C | 20.8°C | 6.0 | 117 | 9 | 0% |
| December | 15.6°C | 12.9°C | 18.9°C | 4.9 | 181 | 13 | 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 April
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Kos in April FAQs
Plain answers, grounded in the averages.
Is Kos hot in April?
Kos is mild in April: the average daytime high is 17.6°C and nights average 14.5°C. Roughly 1 in 167 April days reach 25°C.
Can you swim in the sea in Kos in April?
The sea around Kos averages 17.0°C in April, which is cold for swimming without a wetsuit. Between 1991 and 2020 it ranged from 16°C to 18°C depending on the year.
How much does it rain in Kos in April?
Kos sees about 6 rainy days (1 mm or more) and 39 mm of rain in a typical April. The wettest April between 1991 and 2020 was 2019 (98 mm) and the driest was 2007 (4 mm).
How sunny is Kos in April?
Kos gets around 8.4 hours of sunshine a day in April out of 13.0 hours of daylight (estimated from average cloud cover).
How does Kos compare with the UK in April?
Kos is on average 4.1°C warmer than London by day in April (17.6°C against 13.5°C).
What is the hottest April on record in Kos?
Between 1991 and 2020 the hottest April day in Kos reached 26.4°C on 2018-04-26, and the coldest night dropped to 7.0°C on 1997-04-10.
Is April a good month for reliable heat in Kos?
No. April is mild, with only 1% of days reaching 25°C. If warmth is your main priority, look instead at June, July or August, which are the strongest months here for holiday weather.
How long is the flight from London?
The flight from London takes about 4 hours 6 minutes, making Kos a short-haul option. In April, that journey gets you milder daytime weather than London, but not the dependable heat you might associate with a Greek summer holiday.
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 Kos (Kos Town). 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