Weather in Nettuno: January
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Average day temperature: | 54.6°F |
| Average night temperature: | 48.4°F | |
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Sea water temperature: | 59.3°F |
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Number of sunny days: | 12 days |
| Day length: | 9.2 - 10.0 hours | |
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Number of rainy days: | 5 days |
| Precipitation totals: | 2.5 in. | |
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Air temperature in January, °F
| Day temperature | Night temperature |
The highest day temperature during January of 2025 was 59°F. At the same time the lowest night temperature was 41°F. Daily and nightly averages during January were 56.0°F and 50.6°F.
Sea water temperature in Nettuno in January, °F
The average sea water temperature in January of 2025 was 60.3°F. The highest and lowest sea temperatures during the month were 61.9°F and 58.6°F.
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| Partly cloudy days | |
| Cloudy days |
Number of sunny, partly cloudy and cloudy days in January is almost equal.
Precipitation total in January, in.
Precipitation total value in Nettuno in January is 2.4 in. Other months of the year show relatively similar values.
The average wind speed value in January is 8.7 mph It makes January one of the most windy months of the year.
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 January is: 4.9.
Best time for vacation in Nettuno
Nettuno on a weather map
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