Weather in Rio de Janeiro in October

How October compares

October is the 7th warmest month of the year in Rio de Janeiro and ranks 37th of 134 destinations we compare for October - see where else is hot in October. Against London's average high of 14.6°C in October, Rio de Janeiro is 13.1°C warmer by day and 11.6°C warmer at night.

Daytime and night-time in October

The typical October day in Rio de Janeiro peaks at 27.7°C, but that is an average: the warmest 10% of days reach 33.4°C or more. About 70% of days top 25°C and 1 in 3 pass 30°C. Nights average 20.0°C; one night in ten drops to 17.5°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest October day here reached 39.8°C (2015-10-16) and the coldest night 13.3°C (2003-10-17).

Rain in October

Wet (more than 8 rainy days): about 14 days with 1 mm or more, 115 mm in total. Year to year it varies a lot - the wettest October was 2003 with 251 mm, the driest 2012 with 36 mm. Humidity averages 78%.

Sea temperature in October

The sea averages 22.3°C - warm enough to swim (22°c+). Depending on the year it ranges from 21.1°C to 23.7°C. For the warmest sea here, come in February (26.4°C).

Sunshine and daylight

Around 4.1 hours of sunshine a day (estimated from cloud cover), 12.5 hours of daylight: the sun rises about 05:20 and sets about 17:57 local time in mid-October. Average cloud cover is 67%.

Is October a good time to visit Rio de Janeiro?

It is a reasonable choice: hot days but expect showers. The best months for Rio de Janeiro on our scoring are August, June, July; months averaging 25°C or more: Jan, Feb, Mar, Apr, May, Jun, Aug, Sep, Oct, Nov, Dec.

Hot days, with humidity to consider

Pack for heat rather than a mild spring break. Days reach 25°C on 70% of occasions, while 31% reach 30°C, so lighter clothing is more useful than a wardrobe built around layers. Humidity averages 78%, adding to the sticky feel and making a slower pace around midday sensible. The hottest days can reach 33.4°C or more, so leave room for shade breaks rather than committing to long stretches outdoors. Average nights of 20°C mean evenings generally stay warm, though a light layer is sensible for cooler spells. October suits you best if warmth is a priority and muggy conditions do not bother you.

Expect rain and gaps in the sunshine

The catch is that October is wet, not reliably sunny. About 14 days have measurable rain, so waterproof protection and plans that can move with the weather are more useful than a fixed schedule of outdoor days. That does not mean every rainy day is a washout, but the monthly figures cannot promise a dry part of the day either. Sunshine averages about 4.1 hours within 12.5 hours of daylight: there is ample daylight for being out, but much less actual sunshine. Go if you are comfortable using brighter spells as they come; reconsider if uninterrupted sun is the main reason for the trip.

Swimming is realistic, but the sea is not bath-warm

The sea averages 22.3°C, warm enough for swimming, although it may feel fresh when you first get in. The year-to-year range of 21°C to 24°C means October water can lean towards bracing or feel more comfortable, so do not assume tropical air temperatures translate into equally warm water. If you enjoy a refreshing swim, the average is encouraging; if you strongly prefer very warm seas, this is a compromise. Keep swimming plans flexible around the weather rather than treating every day as a beach day. Light clothes, swimwear and a compact waterproof cover the main contrasts between hot air, cooler water and rain.