January in Alter do Chão — middling scores, decent value
Trade-offs · 6.6/10Days in January average 27°C (81°F) and humidity near 80% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Expect monsoon-level rainfall at 222 mm: only about 19 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 6.6/10 on the same scale — 8th of 12 months, versus 9.9/10 for the best month here.
Budget for 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, September is materially better in Alter do Chão — 3.3 points higher on the same scale.
February in Alter do Chão: mixed conditions, plan around the weather
Trade-offs · 6.6/10Days in February average 27°C (81°F) and humidity near 82% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
192 mm of rain signals a properly wet month, with only about 18 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 6.6/10 on the same scale — 9th of 12 months, versus 9.9/10 for the best month here.
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, September is materially better in Alter do Chão — 3.3 points higher on the same scale.
March in Alter do Chão: mixed conditions, plan around the weather
Trade-offs · 6.3/10March averages 27°C (80°F) and humidity near 86%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
280 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 6.3/10 here, 10th of 12 months, against 9.9/10 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? September scores 3.6 points higher here — enough to change the trip.
April in Alter do Chão — middling scores, decent value
Trade-offs · 6.1/10Days in April average 27°C (80°F) and humidity near 87% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Expect monsoon-level rainfall at 236 mm: only about 17 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 6.1/10 on the same scale — 12th of 12 months, versus 9.9/10 for the best month here.
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, September is materially better in Alter do Chão — 3.8 points higher on the same scale.
May in Alter do Chão — middling scores, decent value
Trade-offs · 6.3/10May averages 27°C (80°F) and humidity near 89%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
208 mm of rain puts this in monsoon territory — about 17 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 6.3/10 here, 11th of 12 months, against 9.9/10 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? September scores 3.6 points higher here — enough to change the trip.
June holds up well in Alter do Chão — 7th best month
Good · 7.9/10Days in June average 27°C (80°F) and humidity near 87% — 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 19 days with 6+ hours of sunshine and 11.9 hours of daylight to work around it.
That is 7.9/10 on the same scale — 7th of 12 months, versus 9.9/10 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, September is materially better in Alter do Chão — 2 points higher on the same scale.
July is one of the strongest months in Alter do Chão (4th)
Best window · 9.1/10Days in July average 28°C (82°F) and humidity near 83% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Budget for roughly 53 mm of rain this month — a flexible day or two helps — with about 23 days with 6+ hours of sunshine and 11.9 hours of daylight to work around it.
On our climate-comfort scale this is one of the strongest months of the year for Alter do Chão at 9.1/10 (4th of 12), just behind September at 9.9/10.
Expect peak pricing, and this is one of the busiest months here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
August in Alter do Chão — one of the year's strongest windows (2nd)
Best window · 9.7/10August averages 30°C (85°F) and humidity near 71%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 34 mm of rain — occasional showers rather than washed-out days — alongside about 27 days with 6+ hours of sunshine and 11.9 daylight hours.
A 9.7/10 puts this among the year's best months in Alter do Chão (2nd of 12); only September scores higher, at 9.9/10.
Plan for 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 Alter do Chão — the year's strongest window
Best window · 9.9/10September averages 32°C (89°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 18 mm of rain — occasional showers rather than washed-out days — alongside about 28 days with 6+ hours of sunshine and 12 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Alter do Chão at 9.9/10 — the reference point every other month on this page is measured against.
Plan for peak pricing, with 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 the lightest breathable clothing you own, a hat, and more water than feels necessary.
October in Alter do Chão — one of the year's strongest windows (3rd)
Best window · 9.7/10At 32°C (90°F), October is at its most extreme: early starts are not optional, and afternoons belong indoors.
With around 39 mm of rain, any showers tend to pass through rather than settle in; about 26 days with 6+ hours of sunshine and 12.1 hours of daylight fill the rest.
On our climate-comfort scale this is one of the strongest months of the year for Alter do Chão at 9.7/10 (3rd of 12), just behind September at 9.9/10.
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 the lightest breathable clothing you own, a hat, and more water than feels necessary.
November is one of the strongest months in Alter do Chão (5th)
Best window · 8.8/10Days in November average 31°C (87°F) — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Budget for roughly 73 mm of rain this month — a flexible day or two helps — with about 21 days with 6+ hours of sunshine and 12.1 hours of daylight to work around it.
On our climate-comfort scale this is one of the strongest months of the year for Alter do Chão at 8.8/10 (5th of 12), just behind September at 9.9/10.
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.
December in Alter do Chão — reliably good (6th best month)
Good · 8.2/10December averages 29°C (85°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 90 mm, so plan one flexible day in three; you still get about 19 days with 6+ hours of sunshine and 12.1 hours of daylight.
It scores 8.2/10 here, 6th of 12 months, against 9.9/10 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, a packable rain layer.
Flexible dates? September scores 1.7 points higher here — enough to change the trip.
