Climate and monthly weather forecast
Niterói, Brazil

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The climate of Niterói

Located in Brazil, Niterói enjoys a tropical wet and dry climate, better known by its Köppen climate classification as Aw. This predominate climate in Niterói features two distinct seasons: a wet season and a dry one.

Over the course of the calendar year, temperatures fluctuate mildly in Niterói. The sea temperature ranges from 21.6°C (70.9°F) in September to 25.8°C (78.4°F) in March. Daily daylight hours see a similar trend, with the shortest day in June at 10.7 hours of daylight, and the longest day in December boasting 13.5 hours of daylight.

An interesting pattern in Niterói's climate is a reverse correlation between sea temperature and daylight hours. While sea temperature peaks in early autumn, daylight hours reach the longest duration at the onset of summer. This noteworthy feature establishes a distinctive climate rhythm for Niterói.

The best time to visit Niterói

Due to its tropical climate, visiting Niterói can be enjoyable all year round. However, for travellers who prefer balmy sea temperatures, the period from January to March, when the sea temperature stays above 25°C (77°F), makes for the most comfortable swimming experience. Accompanied by an average of over 12 hours of daylight, these months offer the perfect conditions for beach-oriented activities, from sunbathing to surfing.

The worst time to visit Niterói

In contrast, the months with the lowest sea temperatures, from July to October when the temperature drops below 23°C (73.4°F), might not be as inviting for water-based activities. Despite this, there's still an average of 11 hours of daylight, allowing ample time to explore Niterói's local attractions and vibrant culture.

Spring weather in Niterói

Spring in Niterói spans from September to November. This season witnesses a gradual increase in sea temperature, transitioning from 21.6°C (70.9°F) in September to 23.2°C (73.8°F) in November. Correspondingly, daylight hours extend from 12 hours in September to 13.2 hours in November. Despite a chillier sea, the growing daylight hours provide a delightful climate for outdoor adventures.

Summer weather in Niterói

The height of summer in Niterói occurs from December to February. During this time, the sea temperature maintains a warm range, fluctuating between 24°C (75.2°F) in December and 25.3°C (77.5°F) in February. Moreover, daylight hours peak at an impressive 13.5 hours during December, gradually decreasing to 12.9 hours in February. This extended sunlight paired with balmy sea temperatures makes Niterói's summer a period of unending beach days.

Autumn weather in Niterói

Autumn, from March to May in Niterói, is marked by a steady decrease in sea temperature from 25.8°C (78.4°F) in March to 23.3°C (73.9°F) in May. Conversely, daylight hours decrease from 12.2 hours in March to 11 hours by May. Despite these reductions, the temperate climate in autumn assures an abundance of recreational outdoor opportunities.

Winter weather in Niterói

Niterói's winter, spanning June to August, maintains a lower sea temperature range, 22.1°C (71.8°F) in June and 22.3°C (72.1°F) in August, and shorter daylight hours between 10.7 in June, extending slightly to 11.3 in August. Even during winter, temperatures remain relatively warm, with enough daylight for sightseeing or indulging in local festivities.

Weather in January

Niterói in January is characterized by warm sea temperatures, creating a welcoming environment for swimming or water sports. This period reveals a mild shift from the hotter months due to a slight drop in sunlight hours. While there might be a refreshing breeze around, it does not pose any discomfort for outdoor activities. Weather in January »

Weather in February

Following January, February is a pleasant time to visit Niterói as the weather remains consistent. A slightly noticeable decrease in daylight hours, does not imply a significant change in weather conditions. Outdoor festivals and beach visits are still very popular among the locals and tourists alike. Weather in February »

Weather in March

As March arrives, there's a slight increase in sea temperature to 25.8°C (78.4°F), making Niterói's waters exceptionally warm. However, the days become shorter with an average of 12.2 hours of daylight, a subtle transition towards the winter season. Weather in March »

Weather in April

April in Niterói brings about a decline in sea temperature to 25.4°C (77.7°F), noting the end of the peak warmth encountered in the preceding month. The progression in decline of daylight hours from 12.2 hours in March to 11.6 hours in April is a signal of climate transition towards cooler conditions. Weather in April »

Weather in May

Entering May, Niterói starts to welcome the chillier part of the year with sea temperatures dropping to 24.3°C (75.7°F). The average daylight hours also decrease to 11 hours, yet still pleasing for those seeking outdoor activities. Weather in May »

Weather in June

With June comes the shortest day of the year, with daylight hours dropping to 10.7 hours. However, this does not overshadow the alluring beauty of Niterói. The decline in sea temperature to 23.3°C (73.9°F) hints at the arrival of winter, yet without any severe chill to restrict beach activities. Weather in June »

Weather in July

July is the coolest month, with the sea temperature dipping to 22.1°C (71.8°F). As winters set in, locals and visitors adapt to this change. However, the climatic conditions do not limit the scope of outdoor activities in Niterói. Weather in July »

Weather in August

During August, daylight hours in Niterói see a steady increase to 11.3 hours. Sea temperatures too mark a change, climbing slightly to 22.3°C (72.1°F). Today, it’s the season transition phase, moving towards more extended days and increasing warmth. Weather in August »

Weather in September

As September ushers in, temperatures in Niterói's sea marginally decrease to 21.6°C (70.9°F). Notwithstanding, the sea conditions remain conducive for water-related activities. A shift towards extended daylight hours marks this period, incrementing to an average of 12 hours, contributing to the city's charm. Weather in September »

Weather in October

October in Niterói witnesses a rise in sea temperature with a surge to 22.7°C (72.9°F). As days become longer, averaging about 12.6 daylight hours, outdoor activities become increasingly attractive. The rise in sea temperature welcomes swimmers to enjoy the waters. Weather in October »

Weather in November

November in Niterói marks the prelude to the hotter part of the year, with a noticeable increase in sea temperature to 23.2°C (73.8°F). Longer daylight hours of 13.2 suggest a climatic shift towards summer. The change in sea temperature indicates a more welcoming environment for swimmers and water sports enthusiasts. Weather in November »

Weather in December

In December, Niterói welcomes its warmest month with sea temperatures peeking at 24°C (75.2°F). The city basks under the sun for the longest during this month, with an average of 13.5 daylight hours. As the year draws to its close, Niterói's weather conditions remain favorable to outdoor enthusiasts. Weather in December »

Frequently asked questions

What is the month with the warmest sea water in Niterói?

March is the month with the warmest seawater in Niterói, Brazil, with an average sea temperature of 25.8°C (78.4°F).

What is the month with the shortest days in Niterói?

With an average of 10h and 48min of daylight, June has the shortest days of the year in Niterói.

What is the month with the coldest sea water in Niterói?

The month with the coldest seawater is September, with an average sea temperature of 21.6°C (70.9°F).

When are the longest days in Niterói?

December has the longest days of the year, with an average of 13h and 30min of daylight.

Is there Daylight Saving Time (DST) in Niterói?

Niterói, Brazil, does not utilize Daylight Saving Time (DST). -03 timezone is used over the entire year.

Average sea temperature
Niterói, Brazil

Average sea temperature - Niterói, Brazil

The best month for swimming (with the highest average sea temperature) is March (25.8°C).
The coldest month (with the lowest average sea temperature) is September (21.6°C).

Average daylight
Niterói, Brazil

Average daylight - Niterói, Brazil

The month with the longest days is December (Average daylight: 13h and 30min).
The month with the shortest days is June (Average daylight: 10h and 48min).

Niterói, Brazil

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