Hello, and welcome back to Just Answer.
You didn't specify if you were going to San Jose, California or San José, Costa Rica in Central America, so I wanted to provide you with information if you should be traveling to Costa Rica.
San José, Costa Rica typically has daily temperatures between 70 to 80°F (21 to 27°C) with high humidity, throughout the year, though it can get chilly (low to mid 60's) at night. The rainy season is from the middle of April through the month of December. Since you will be visiting in the first week of June, it will be during the rainy season, so pack rain gear. Chance of precipitation for next week is 60% every day.
You can view the 10 day weather forecast from today, on, at the site below:http://www.weather.com/weather/tenday/San+Jose+CSXX0009:1:CS
You would want to pack clothes suitable for Spring/Summer weather for daytime and definitely have a light jacket, sweater, or sweatshirt and a raincoat and umbrella with you, at all times. A heavier jacket and/or sweatshirt might be necessary for nighttime and although it will be in the low to mid 80's during the day, if there is less sun and more cloud cover, it shouldn't feel as warm, but it will be humid. Shorts and long pants would be suitable, with short-sleeved tops/shirts (I don't know if you are male or female).
Whenever you travel at this time of year, to a warm, humid area, bring lightweight clothing which is easily laundered and doesn't wrinkle easily. You can bring sandals for the daytime, and closed shoes for rainy days and cooler nighttimes.
I wish you safe travel and a wonderful trip!
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