Weather in Niteroi: May
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Average day temperature: | 78.1°F |
| Average night temperature: | 68.5°F | |
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Sea water temperature: | 74.9°F |
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Number of sunny days: | 15 days |
| Day length: | 10.8 - 11.3 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 0.9 in. | |
| more information | ||
14 days
forecast
forecast
| Niteroi |
sea water
temperature
temperature
| Niteroi |
Air temperature in May, °F
Show year:
2026
2025
2024
The highest day temperature during May of 2026 was 88°F. At the same time the lowest night temperature was 63°F. Daily and nightly averages during May were 76.6°F and 69.1°F.
Sea water temperature in Niteroi in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 75.0°F. The highest and lowest sea temperatures during the month were 77.0°F and 73.4°F.
Sunny, partly cloudy and cloudy days
Mostly all days in May are sunny but cloudy days are also possible.
Precipitation total in May, in.
Precipitation total value in Niteroi in May is 0.9 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 5.5 mph
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in May is: 6.8.
Best time for vacation in Niteroi
Niteroi on a weather map
Places in Brazil:
Name
°F
24 Hours Forecast
Niteroi
Local time: 23:19
August 06, thursday
0000
73°F
SW
5 mph
5 mph
0300
72°F
SW
5 mph
5 mph
0600
70°F
S
4 mph
4 mph
0900
79°F
S
6 mph
6 mph
1200
88°F
SE
4 mph
4 mph
1500
88°F
W
3 mph
3 mph
1800
81°F
W
7 mph
7 mph
2100
77°F
SE
2 mph
2 mph
