Weather in San Isidro in June

Shoulder season. June is shoulder season in San Isidro — cheaper, quieter, and a genuine gamble. You should expect rain on 26 days of the month, which is more days wet than dry.

June ranks 10 of 12 — near the bottom of San Isidro's year. February is the month that works, and the swing between the two is 20 points, which is a different holiday rather than a slightly better one.

Rain on 26 of the month's 30 days, 9 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 89% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average June reaches 30 °C; the day barely swings — 4.9 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest June day reached 29.6 °C and the coldest night fell to 19 °C, and the wettest single day dropped 52 mm — roughly 22% of the month's rain in one day.

June is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest June on record still delivered 435 mm against 97 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 240 mm average is a reasonable planning figure, not a promise.

Wind is light at 1.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 89% is the real story though — it is the number that decides how the day feels, not the 26.6 °C.

How June sits in the year

Temperatures hold steady either side: 27.5 °C in May, 26.6 here, 26.4 in July. Nothing about the timing within the month matters much.

Daylight in June

San Isidro sits close enough to the equator that daylight barely moves all year — 12.7 hours in June, against a range of just 1.1 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

An inland climate

Despite being inland, the year stays fairly even: 9.3 °C between the year's warmest afternoons and coldest nights. At 713 m the air is thin enough to matter — sun that burns faster than the temperature suggests, and nights that cool off quickly.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

June in San Isidro versus nearby

If San Isidro is one option among several, the nearby comparison is worth making. San José is close enough to be a coin toss — 2.7 °C cooler, 1 day less rain. Limón is close enough to be a coin toss — 2.3 °C warmer, 3 days more rain.

So: June is a compromise. February is 19 points better and is what San Isidro is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in San Isidro

See all twelve months in San Isidro, or where else to go in June.