Guanacaste weather in January
Guanacaste averages 32°C by day and 25°C at night in January, with the sea at 28°C and about 14 mm of rain in the month.
Day
32°C
Night
25°C
Sea
28°C
Rain
14 mm
Flight from London
11h
What January feels like
January is hot in Guanacaste: proper beach weather.
The sea is warm at 28°C: comfortable for long swims.
It is dry: only about 14 mm of rain in the month.
That is 25°C warmer than an average January day in London.
Of the 56 sun destinations we track, Guanacaste is the #1 warmest in January.
Guanacaste weather by month
January is highlighted. Compare with December and February, or see the full year in Guanacaste.
| Month | Day | Night | Sea | Rain |
|---|---|---|---|---|
| January | 32°C | 25°C | 28°C | 14 mm |
| February | 34°C | 25°C | 28°C | 6 mm |
| March | 34°C | 25°C | 29°C | 15 mm |
| April | 34°C | 26°C | 30°C | 70 mm |
| May | 31°C | 25°C | 30°C | 267 mm |
| June | 29°C | 24°C | 30°C | 379 mm |
| July | 30°C | 25°C | 30°C | 240 mm |
| August | 30°C | 24°C | 30°C | 295 mm |
| September | 29°C | 24°C | 30°C | 346 mm |
| October | 29°C | 24°C | 29°C | 502 mm |
| November | 29°C | 24°C | 28°C | 214 mm |
| December | 31°C | 24°C | 29°C | 37 mm |
Guanacaste in January: quick answers
Is Guanacaste hot in January?
January is hot in Guanacaste: proper beach weather. Average highs are 32°C and lows 25°C.
Can you swim in Guanacaste in January?
The sea is warm at 28°C: comfortable for long swims.
Does it rain in Guanacaste in January?
It is dry: only about 14 mm of rain in the month.
What is the warmest month in Guanacaste?
March, at an average high of 34°C. The coolest is October at 29°C.
How long is the flight to Guanacaste from the UK?
About 11h direct from London, estimated from the 8,795 km distance. Check your airline for exact times.
Still choosing? See where is hot in January for every destination ranked by temperature, sea and flight time.
How we measured this
Averages of every day in January from 2016 to 2025, from the Open-Meteo historical weather archive (ECMWF ERA5 reanalysis). Sea temperature is the 2023 to 2025 average from the Open-Meteo marine archive. Rain is the average monthly total. Reanalysis describes an area about 25 km across, so sheltered resorts can run a degree or two warmer. Flight time is a distance-based estimate from London Heathrow.
Planning Guanacaste in January?
Save the restaurants, beaches and views you find on TikTok and Instagram for Guanacaste straight to a map, then let Dream Trip turn them into a day-by-day plan.
