Weather in Guanacaste in March

How March compares

March is the 2nd warmest month of the year in Guanacaste and ranks 4th of 134 destinations we compare for March - see where else is hot in March. Against London's average high of 10.5°C in March, Guanacaste is 22.3°C warmer by day and 19.6°C warmer at night.

Daytime and night-time in March

The typical March day in Guanacaste peaks at 32.8°C, but that is an average: the warmest 10% of days reach 34.9°C or more. About 100% of days top 25°C and almost every pass 30°C. Nights average 22.9°C; one night in ten drops to 21.7°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest March day here reached 37.3°C (2016-03-31) and the coldest night 18.4°C (2001-03-02).

Rain in March

Dry (3 rainy days or fewer): about 1 days with 1 mm or more, 3 mm in total. Year to year it varies a lot - the wettest March was 2003 with 24 mm, the driest 1992 with 0 mm. Humidity averages 63%.

Sea temperature in March

The sea averages 27.1°C - warm enough to swim (22°c+). Depending on the year it ranges from 26.1°C to 28.1°C. For the warmest sea here, come in May (28.9°C).

Sunshine and daylight

Around 8.5 hours of sunshine a day (estimated from cloud cover), 11.9 hours of daylight: the sun rises about 05:49 and sets about 17:53 local time in mid-March. Average cloud cover is 29%.

Is March a good time to visit Guanacaste?

Yes - it is one of the better months: hot days, little rain and long sunny days. 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 proper heat, including warm evenings

March is among Guanacaste's hottest months, so treat the heat as part of your daily planning rather than an occasional inconvenience. Almost every day reaches 30°C, and hotter days can reach 35°C or more. With humidity at 63%, shade and regular drinks deserve a place in your plans, particularly around midday. Do your more energetic activities in the morning and leave room for a slower afternoon. Nights average 23°C, so evenings stay warm rather than offering a sharp cool-down. Pack light, breathable clothing and check that your accommodation has cooling you will be comfortable sleeping with. This is not the month for travellers who dislike sustained heat.

Dry days and a sea made for swimming

Rain is unlikely to dictate your March plans: this is a dry month, so arranging outdoor time is a reasonable bet, though a shower is still possible. Sunshine averages about 8.5 hours within 11.9 hours of daylight, giving you plenty of bright weather without promising clear skies throughout every day. Bring sun protection and plan access to shade rather than relying on cloud to soften the heat. The sea is comfortably warm for swimming, with the year-to-year range running from 26°C to 28°C. That makes March well suited to spending time in the water, although warm water may feel less cooling than you expect after a hot afternoon.