2025 Compare Climate & Weather:
Mill Valley, CA vs Urban Honolulu, HI

Highlights

On average, there are 271 sunny days per year in Urban Honolulu. Mill Valley averages 255 sunny days per year. The US average is 205 sunny days.

Urban Honolulu, Hawaii gets 48.8 inches of rain, on average, per year. Mill Valley, California gets 40.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Urban Honolulu averages 0 inches of snow per year. Mill Valley averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Urban Honolulu, Hawaii
Summer High: the July high is around 84.9 degrees
Winter Low: the January low is 65.3
Rain: averages 48.8 inches of rain a year
Snow: averages 0 inches of snow a year

Mill Valley, California
Summer High: the July high is around 76.5 degrees
Winter Low: the January low is 42.9
Rain: averages 40.6 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Honolulu is 8.3 (10=best), which means it is less comfortable than most places in Hawaii.

The annual BestPlaces Comfort Index for Mill Valley is 8.4 (10=best), which means it is more comfortable than most places in California.

Today's Weather - Mill Valley, CA

69°F

Today's Weather - Urban Honolulu, HI

85°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Mill Valley / Urban Honolulu

September is the hottest month for Mill Valley with an average high temperature of 76.9°, which ranks it as cooler than most places in California. In Mill Valley, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mill Valley are September, August and July.

September is the hottest month for Honolulu with an average high temperature of 85.8°, which ranks it as warmer than most places in Hawaii. In Honolulu, there are 10 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Honolulu are January, February and March.

January has the coldest nighttime temperatures for Mill Valley with an average of 42.9°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Honolulu with an average of 65.3°. This is warmer than most places in Hawaii.

In Mill Valley, there are 12.3 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Honolulu, there are 7.8 days annually when the high temperature is over 90°, which is hotter than most places in Hawaii.

In Mill Valley, there are 2.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Honolulu, there are 0.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Hawaii.

In Mill Valley, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In Honolulu, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Hawaii.

December is the wettest month in Mill Valley with 8.3 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 40.6 inches in Mill Valley means that it is wetter than most places in California.


December is the wettest month in Honolulu with 6.3 inches of rain, and the driest month is May with 2.7 inches. The wettest season is Spring with 31% of yearly precipitation and 19% occurs in Autumn, which is the driest season. The annual rainfall of 48.8 inches in Honolulu means that it is about average compared to other places in Hawaii.

January is the rainiest month in Mill Valley with 12.8 days of rain, and July is the driest month with only 0.9 rainy days. There are 78.1 rainy days annually in Mill Valley, which is rainier than most places in California. The rainiest season is Spring when it rains 48% of the time and the driest is Autumn with only a 5% chance of a rainy day.

July is the rainiest month in Honolulu with 18.7 days of rain, and February is the driest month with only 12.6 rainy days. There are 194.9 rainy days annually in Honolulu, which is rainier than most places in Hawaii. The rainiest season is Autumn when it rains 27% of the time and the driest is Spring with only a 23% chance of a rainy day.

There is rarely any recorded snowfall in Mill Valley, ranking it as one of the least snowy places in California.

There is rarely any recorded snowfall in Honolulu, ranking it as one of the least snowy places in Hawaii.

Any measurable snowfall is a rare occurance in Mill Valley.

Any measurable snowfall is a rare occurance in Honolulu.