Weather in Guanacaste in April

How April compares

April is the 1st warmest month of the year in Guanacaste and ranks 5th of 134 destinations we compare for April - see where else is hot in April. Against London's average high of 13.5°C in April, Guanacaste is 20.2°C warmer by day and 18.6°C warmer at night.

Daytime and night-time in April

The typical April day in Guanacaste peaks at 33.7°C, but that is an average: the warmest 10% of days reach 35.7°C or more. About 100% of days top 25°C and almost every pass 30°C. Nights average 23.7°C; one night in ten drops to 22.5°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest April day here reached 38.3°C (2020-04-11) and the coldest night 19.8°C (2006-04-15).

Rain in April

Some rain (4-8 rainy days): about 5 days with 1 mm or more, 31 mm in total. Year to year it varies a lot - the wettest April was 2010 with 167 mm, the driest 1998 with 0 mm. Humidity averages 65%.

Sea temperature in April

The sea averages 28.2°C - warm enough to swim (22°c+). Depending on the year it ranges from 27.5°C to 28.7°C. For the warmest sea here, come in May (28.9°C).

Sunshine and daylight

Around 6.1 hours of sunshine a day (estimated from cloud cover), 12.2 hours of daylight: the sun rises about 05:31 and sets about 17:53 local time in mid-April. Average cloud cover is 51%.

Is April a good time to visit Guanacaste?

It is a reasonable choice: hot days - though the heat can be intense at midday. The best months for Guanacaste on our scoring are February, January, December; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

Expect serious heat, not just warm spring weather

The main catch in April is how persistent the heat is: temperatures reach 30°C on 99% of days, so a cooler afternoon is not something to rely on. The hottest days reach 36°C or more, while humidity of 65% can make conditions feel close. Plan anything energetic for earlier in the day, leave room for shade around midday and choose accommodation where you can cool down comfortably. Loose, breathable clothing is more useful than heavy layers, and evenings remain warm rather than offering much relief. April suits travellers happy to slow down in the heat; it is a harder fit if you want to stay active throughout the day.

Warm sea, with some rain to work around

The sea is comfortably warm for swimming, making April a sensible choice if time in the water is a priority. That warmth does not tell you about waves or currents, so follow local safety advice before swimming. On land, expect about 5 rainy days rather than an entirely dry month. Keep outdoor plans flexible and pack a light waterproof, but there is no need to treat rain as the defining feature of the trip. Sunshine averages about 6.1 hours within 12.2 hours of daylight, so do not expect clear skies all day. Sun protection still belongs in your daily routine, alongside drinking water and taking breaks out of the heat.