Weather in San Isidro in March

A good month. March is a solid month to be in San Isidro. Highs average 29.2 °C, lows 20.3 °C, and rain falls on 14 days — nothing in the month is working against you.

March ranks 3 of 12 in San Isidro. Only February scores clearly higher, and the difference is small enough to be settled by price rather than weather.

This is persistent light rain rather than storms: 14 wet days but only 1 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. Pack for 29.2 °C days and 20.3 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 7 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest March day reached 32.5 °C and the coldest night fell to 17.4 °C, and the wettest single day dropped 55 mm — roughly 76% of the month's rain in one day.

March is moderately variable: 18 mm in the driest year against 151 mm in the wettest, around an average of 72 mm. Roughly two Marchs in three land near that average, and the third does something else entirely.

Wind is light at 1.8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 74%.

How March sits in the year

Temperatures hold steady either side: 27.8 °C in February, 29.2 here, 29.2 in April. Nothing about the timing within the month matters much.

Daylight in March

San Isidro sits close enough to the equator that daylight barely moves all year — 12.1 hours in March, 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

Shoulder. The value months — prices ease off and you get the place closer to itself. March is the value pick for San Isidro: it scores within 10 points of February without carrying February's prices.

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

March in San Isidro versus nearby

If San Isidro is one option among several, the nearby comparison is worth making. San José is a better bet in March — within a degree on temperature, 7 days less rain. Limón is close enough to be a coin toss — within a degree on temperature, 2 days more rain.

So: March works, with February the better month by 10 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in San Isidro

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