January in San Juan — the year's strongest window
Best window · 8.9/10January averages 26°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Expect 44 mm of rain — occasional showers rather than washed-out days — alongside about 18 sunny days and 11 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for San Juan at 8.9/10 — the reference point every other month on this page is measured against.
Expect peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack light clothing, swimwear and real sun protection.
February in San Juan — the year's strongest window
Best window · 8.7/10February averages 25°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rainfall runs 59 mm, so plan one flexible day in three; you still get about 19 sunny days and 11.4 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for San Juan at 8.7/10 — the reference point every other month on this page is measured against.
Expect mid-season pricing, and crowds are moderate.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
March in San Juan — the year's strongest window
Best window · 9.4/10March averages 26°C (79°F) with humidity around 73%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 47 mm, so plan one flexible day in three; you still get about 28 sunny days and 11.9 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for San Juan at 9.4/10 — the reference point every other month on this page is measured against.
Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
April in San Juan — the year's strongest window
Best window · 8.6/10April averages 27°C (80°F) with humidity around 75%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 95 mm, so plan one flexible day in three; you still get about 28 sunny days and 12.4 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for San Juan at 8.6/10 — the reference point every other month on this page is measured against.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
May in San Juan — reliably good (7th best month)
Good · 7.9/10May averages 28°C (82°F) with humidity around 78%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 140 mm this is a genuinely wet month: about 28 sunny days in total, and outdoor plans need an indoor fallback.
It scores 7.9/10 here, 7th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, March is materially better in San Juan — 1.5 points higher on the same scale.
June in San Juan — the year's strongest window
Best window · 8.7/10June averages 29°C (84°F) with humidity around 78%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 88 mm, so plan one flexible day in three; you still get about 29 sunny days and 13.1 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for San Juan at 8.7/10 — the reference point every other month on this page is measured against.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
July in San Juan — reliably good (6th best month)
Good · 8.2/10July averages 29°C (83°F) with humidity around 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 118 mm this is a genuinely wet month: about 27 sunny days in total, and outdoor plans need an indoor fallback.
It scores 8.2/10 here, 6th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
August in San Juan — reliably good (8th best month)
Good · 7.8/10August averages 29°C (84°F) with humidity around 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 147 mm this is a genuinely wet month: about 28 sunny days in total, and outdoor plans need an indoor fallback.
It scores 7.8/10 here, 8th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, March is materially better in San Juan — 1.6 points higher on the same scale.
September in San Juan — reliably good (9th best month)
Good · 7.7/10September averages 29°C (84°F) with humidity around 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 151 mm this is a genuinely wet month: about 26 sunny days in total, and outdoor plans need an indoor fallback.
It scores 7.7/10 here, 9th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, March is materially better in San Juan — 1.7 points higher on the same scale.
October in San Juan — reliably good (11th best month)
Good · 7.2/10October averages 29°C (83°F) with humidity around 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
218 mm of rain puts this in monsoon territory — about 21 sunny days across the whole month, and multi-day washouts are normal.
It scores 7.2/10 here, 11th of 12 months, against 9.4/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, March is materially better in San Juan — 2.2 points higher on the same scale.
November in San Juan — workable with trade-offs
Trade-offs · 6.4/10November averages 27°C (81°F) with humidity around 82%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
203 mm of rain puts this in monsoon territory — about 15 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.4/10 here, 12th of 12 months, against 9.4/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, March is materially better in San Juan — 3 points higher on the same scale.
December in San Juan — reliably good (10th best month)
Good · 7.7/10December averages 26°C (79°F) with humidity around 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 77 mm, so plan one flexible day in three; you still get about 15 sunny days and 10.9 hours of daylight.
It scores 7.7/10 here, 10th of 12 months, against 9.4/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
If your dates are flexible, March is materially better in San Juan — 1.7 points higher on the same scale.
