The highest day temperature in January 2026 was 53°F. The lowest night temperature was 24°F. The average values for day and night temperatures during January were 45.0°F и 37.1°F respectivly.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Castro is 2.0 in. It makes january one of the most rainy months of the year.

The average wind speed in January is 6.3 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Castro in January is 5.1 hours.