Temperature
Warm by day, mild at night.
83°Ftypical September high
Typical range
September climate
September in Rio de Janeiro
Brazil · South America
Warm days and plenty of sun.
Good overall
Early to mid
Daytime high
83°F
Lows around 66°F
Rain
Several rainy days
Sun
8.5 h/day
Air feel
Humid
Sea temp
71°F
Cool water for swimming
When to visit
Month-by-month fit
Best
Precipitation
Several rainy days. About 11 wet days, fewer than in most months.
37%wet-day frequency
AmountWet-day chance
Sunshine
Plenty of sun this month.
8.7 hSeptember sunshine
Heat & humidity by month
Warm days, with humid periods.
61%September Heat feel
Easy airWarm airHot airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 83° and nights feel near 71°.
ComfortableWarmHotSwelteringNight hours
Clear sky
Partly cloudy skies this month.
45%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
4 mphSeptember Calm
Sea temperature
71°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 81°F, easing to about 73°F in early evening.
Avg temp Typical range
Morning76°F
Feels 79°F
Rain22%
Cloud55%
Humid airHigh
Sun intensityModerate
Midday82°F
Feels 84°F
Rain22%
Cloud57%
Humid airModerate
Sun intensityStrong
Late afternoon80°F
Feels 82°F
Rain20%
Cloud56%
Humid airHigh
Sun intensityLow
Early evening73°F
Feels 76°F
Rain20%
Cloud54%
Humid airHigh
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 90 | 75 | 10.2 | 21 | 9.8 | 79 | 79 |
| Feb | 91 | 75 | 7.8 | 18 | 10.3 | 79 | 80 |
| Mar | 88 | 74 | 7.7 | 20 | 9.7 | 81 | 80 |
| Apr | 85 | 71 | 4.3 | 14 | 9.6 | 82 | 78 |
| May | 81 | 66 | 2.6 | 10 | 8.8 | 82 | 76 |
| Jun | 80 | 64 | 1.7 | 7 | 8.7 | 82 | 73 |
| Jul | 80 | 63 | 1.8 | 7 | 8.4 | 80 | 71 |
| Aug | 81 | 64 | 1.8 | 8 | 9.0 | 78 | 71 |
| Sep | 83 | 66 | 3.0 | 11 | 8.7 | 77 | 71 |
| Oct | 84 | 69 | 4.9 | 15 | 9.0 | 78 | 73 |
| Nov | 84 | 71 | 8.0 | 19 | 9.1 | 80 | 74 |
| Dec | 88 | 74 | 9.2 | 22 | 9.9 | 80 | 76 |
Similar climates
Similar
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Want a side-by-side climate view? Compare Rio de Janeiro with Miami.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 4, 2026
Data & methodology