January Weather in Guerneville

Last updated: March 2, 2024

The weather in Guerneville, United States, during January is characterized by an average temperature of 10°C (50°F). Highs can soar to 20°C (69°F), while lows may dip to 1°C (33°F). Typically, the humidity level in Guerneville throughout January hovers around 86%.

1°C (33°F)

Minimum temperature

10°C (50°F)

Average temperature

20°C (69°F)

Maximum temperature

86%

Humidity

Precipitation and Sunshine hours

In January, Guerneville averages 140 mm (5.5 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 9 hours 48 minutes of daylight, with the sun shining for approximately 4 hours 32 minutes each day. Additionally, there is a 39% probability of sunny days during this period.

140 mm (5.5 inches)

Precipitation

9 rainy days

Rainy days

4 hours 32 minutes

Sunshine hours

39%

Chance of sun

UV Index

In January, the UV Index in Guerneville reaches a maximum of 3, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, during which unprotected skin may burn in as little as 30 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 0 1 1 2 3 3 3 3 2 1 1 0 0
Exposure Low Moderate Low
Time to burn 45 min 30 min 45 min

Compare Guerneville's Climate with Cities Worldwide