30YearWeather
Rio de Janeiro
When to avoid visiting Rio de Janeiro, Brazil
Seasonal Comparison

Least Favorable Months in Rio de Janeiro

Based on 30 years of NASA satellite data, Rio de Janeiro enjoys relatively good weather year-round. However, if you're comparing months, December, April, January are the least favorable — though still perfectly visitable.

December58/100April59/100January60/100

Good news: Rio de Janeiro has no truly bad months!

With a score of 58/100, even December(the "worst" month) is still a reasonable time to visit. These months are simply the least favorable compared to other months in Rio de Janeiro, not objectively bad. Many travelers enjoy visiting during these periods and benefit from lower prices and fewer crowds.

Why December is the Least Favorable (But Still Okay) Time to Visit Rio de Janeiro

Is December a Good Time to Visit Rio de Janeiro?

👌Decent conditions for most activities
Short Answer

Ideal beach conditions in Rio de Janeiro during December: 24.1°C turquoise waters, 30°C air, 38% rain. 0.8m calm waves suit families and swimmers alike.

Decision Factors

Oppressive heat and humidity

29.9°C with 79% humidity - challenging conditions

Vaccinations required

Yellow Fever

Feels significantly hotter than 29.9°C

Heat index: 37°C due to 79% humidity

Pleasant swimming conditions

24.1°C sea temperature

Health precautions needed

Be aware of: Leptospirosis, Melioidosis, Schistosomiasis

Plenty of sunshine

10h of sunshine daily

Good For

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

Who Should Avoid

  • 👴
    Elderly travelers

    Heat index of 37°C poses health risks

  • 🌡️
    Heat-sensitive visitors

    37°C feels-like temperature creates discomfort

930 observations30-year historical data
Confidence: 99%

Key Challenges During These Months

Extreme Heat

Temperatures can become dangerously hot with oppressive humidity

Months to Avoid: Detailed Breakdown

Worst58

December

Oppressive heat and humidity, Feels significantly hotter than 29.9°C

View details
2nd Worst59

April

Oppressive heat and humidity, Peak tourist season

View details
3rd Worst60

January

Oppressive heat and humidity, Feels significantly hotter than 31.1°C

View details

Looking for the Best Time Instead?

Discover the optimal months to visit Rio de Janeiro with ideal weather conditions, fewer crowds, and better prices.

Best Time to Visit Rio de Janeiro

Frequently Asked Questions

When should I avoid visiting Rio de Janeiro?

Based on 30 years of data, the most challenging months are December, April, January. Primary concerns include: oppressive heat and humidity, feels significantly hotter than 29.9°c.

What is the worst month to visit Rio de Janeiro?

December is typically the most challenging month, scoring only 58/100 in our travel conditions analysis.

Can I still visit during these months?

Yes, many travelers still visit during challenging months. Come prepared with appropriate gear, flexible bookings, and backup plans. Lower prices and fewer tourists can offset the weather challenges.

Are hotels cheaper during these months?

Often yes. Low season typically means reduced hotel rates, easier reservations, and fewer crowds at popular attractions. Some travelers prefer this trade-off.