Here is a brief break down of Costa Rica weather by month.
January tends to be hot and sunny. You can expect strong winds in the area around San Jose and in the Central Valley. This is the most popular time of year to travel. Prices are high, but you can also expect everything to still be nice and green from rainy season.
February is similar to January. The one difference is that things start to turn a bit browner as the country goes longer without rain.
March is hot and sunny. The winds in San Jose have usually started to die down by this time of year. Everything has started to turn brown.
Easter is one of the busiest travel times of the year because all Costa Ricans are also enjoying nice beach days. The weather tends to be very hot. In the second half of the month you may experience the start of a few afternoon storms.
In May prices start to go down and the rain officially starts again. Usually you won’t have rains storms every afternoon. Things start to turn green again.
June is a great month to travel because everything is fully green again, prices have gone down, and the weather is usually decent. You will have afternoon thunderstorms for an hour or so every day.
July is very similar to June. Costa Ricans claim that there is a two week period in July in which the country does not get rain. I will say, we have been living here for 4 summers now and twice we have experienced this two week let up of rain.
Things get a bit more rainy in August. You may have a few gray days, but overall the weather tends to be good during the day with a daily afternoon rainstorm.
You may have some rainy days in September, but usually the weather is OK. However, you can expect afternoon thunderstorms. Also, keep in mind that this is hurricane season. Costa Rica very rarely gets hot by hurricanes, but the country has experienced a few tropical storms in recent years.
October is typically rainy and a bit gray. Prices tend to go way down and a lot of hotels close down because there just aren’t enough tourists.
November is typically a rainy month in Costa Rica. You can expect some days of all gray but other days will be perfectly sunny and nice. It is a hard month to predict!
The first half of December can still be a bit rainy, but usually the second half of the month is dry and sunny. The weeks around Christmas is the busiest time of year here so book your hotels early!
Need more tips on the weather? Check out our more detailed guide to Costa Rican weather by month.