January in Surabaya — the hardest end of the year
Hardest · 3.4/10At 26°C (78°F) this is comfortable city weather in January, with sightseeing easiest before lunch and after the afternoon peak.
This is the year's wettest stretch at 313 mm, but with about 20 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 3.4/10 on the same scale — 8th of 12 months, versus 8.1/10 for the best month here.
Expect low-season pricing, and crowds are light for this destination.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella.
If your dates are flexible, August is materially better in Surabaya — 4.7 points higher on the same scale.
February in Surabaya — off-season conditions
Hardest · 3.2/10At 26°C (78°F) this is comfortable city weather in February, with sightseeing easiest before lunch and after the afternoon peak.
Expect monsoon-level rainfall at 400 mm: only about 17 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 3.2/10 on the same scale — 10th of 12 months, versus 8.1/10 for the best month here.
Budget for low-season pricing, and crowds are light for this destination.
Pack light clothing, a hat and real sun protection, a proper rain shell rather than an umbrella.
If your dates are flexible, August is materially better in Surabaya — 4.9 points higher on the same scale.
March in Surabaya — the hardest end of the year
Hardest · 3.4/10March averages 26°C (79°F) and humidity near 88%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
232 mm makes this the wettest stretch of the year, though about 20 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.
It scores 3.4/10 here, 9th of 12 months, against 8.1/10 in the destination's best month.
Figure on low-season pricing, with 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.
Flexible dates? August scores 4.7 points higher here — enough to change the trip.
April in Surabaya — the hardest end of the year
Hardest · 3.1/10Days in April average 27°C (80°F) and humidity near 86% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Expect monsoon-level rainfall at 241 mm: only about 19 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 3.1/10 on the same scale — 12th of 12 months, versus 8.1/10 for the best month here.
Budget for 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, August is materially better in Surabaya — 5 points higher on the same scale.
May in Surabaya — workable with trade-offs
Trade-offs · 5.1/10May averages 26°C (79°F) and humidity near 85%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Monthly rainfall reaches 113 mm — wet for this destination — but about 20 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 5.1/10 here, 6th of 12 months, against 8.1/10 in the destination's best month.
Plan for low-season pricing, with crowds are light for this destination. That combination — decent conditions at the lowest rates of the year — is the best value window on this page.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Flexible dates? August scores 3 points higher here — enough to change the trip.
June in Surabaya — workable with trade-offs
Trade-offs · 6/10Days in June average 26°C (79°F) and humidity near 81% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Budget for roughly 78 mm of rain this month — a flexible day or two helps — with about 17 days with 6+ hours of sunshine and 11.6 hours of daylight to work around it.
That is 6/10 on the same scale — 4th of 12 months, versus 8.1/10 for the best month here.
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, August is materially better in Surabaya — 2.1 points higher on the same scale.
July holds up well in Surabaya — 2nd best month
Good · 7.4/10At 26°C (79°F) this is comfortable city weather in July, with sightseeing easiest before lunch and after the afternoon peak.
Budget for roughly 54 mm of rain this month — a flexible day or two helps — with about 22 days with 6+ hours of sunshine and 11.6 hours of daylight to work around it.
That is 7.4/10 on the same scale — 2nd of 12 months, versus 8.1/10 for the best month here.
Budget for 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 light clothing, a hat and real sun protection, a packable rain layer.
August in Surabaya tops the year's climate scores
Best window · 8.1/10August averages 27°C (81°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rain is a non-issue at 9 mm for the month, with about 25 days with 6+ hours of sunshine and 11.8 hours of daylight to work with.
On our climate-comfort scale this is the top-ranked month of the year for Surabaya at 8.1/10 — the reference point every other month on this page is measured against.
Figure on peak pricing, with 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.
September in Surabaya — reliably good (3rd best month)
Good · 7.1/10September averages 29°C (84°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 44 mm of rain — occasional showers rather than washed-out days — alongside about 27 days with 6+ hours of sunshine and 12 daylight hours.
It scores 7.1/10 here, 3rd of 12 months, against 8.1/10 in the destination's best month.
Figure on mid-season pricing, with crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
October in Surabaya — workable with trade-offs
Trade-offs · 5.4/10Days in October average 29°C (85°F) — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Budget for roughly 91 mm of rain this month — a flexible day or two helps — with about 27 days with 6+ hours of sunshine and 12.2 hours of daylight to work around it.
That is 5.4/10 on the same scale — 5th of 12 months, versus 8.1/10 for the best month here.
Budget for 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, August is materially better in Surabaya — 2.7 points higher on the same scale.
November in Surabaya: expect compromises
Hardest · 3.5/10Days in November average 28°C (83°F) and humidity near 75% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
190 mm of rain makes this a wet month here, though with about 20 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 3.5/10 on the same scale — 7th of 12 months, versus 8.1/10 for the best month here.
Budget for 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, August is materially better in Surabaya — 4.6 points higher on the same scale.
December in Surabaya: expect compromises
Hardest · 3.2/10December averages 26°C (79°F) and humidity near 86%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
513 mm of rain puts this in monsoon territory — about 19 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 3.2/10 here, 11th of 12 months, against 8.1/10 in the destination's best month.
Plan for low-season pricing, with 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.
Flexible dates? August scores 4.9 points higher here — enough to change the trip.
