Marin County Weather by Month — Temperature & Rainfall Guide

Marin County is a region in the United States of America. Many people wonder what the weather conditions are in Marin County over the year. What is the best time to visit Marin County?

This page shows the average weather conditions by month in Marin County over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

January is a winter month. In Novato you can expect mild maximum average daytime temperatures around 14°C (57°F) and nighttime temperatures around 5°C (41°F).

Find more detailed climate information for Marin County in January here.

February is a winter month. In Novato you can expect mild maximum average daytime temperatures around 16°C (61°F) and nighttime temperatures around 6°C (43°F).

Find more detailed climate information for Marin County in February here.

In Novato you can expect mild maximum average daytime temperatures around 18°C (64°F) and nighttime temperatures around 6°C (43°F).

Find more detailed climate information for Marin County in March here.

The temperatures range from moderate in Sausalito with 17°C (63°F) to pleasant in Novato with 20°C (68°F).

Find more detailed climate information for Marin County in April here.

The temperatures range from moderate in Sausalito with 18°C (64°F) to high in Novato with 22°C (72°F).

Find more detailed climate information for Marin County in May here.

The temperatures range from pleasant in Sausalito with 19°C (66°F) to high in Novato with 26°C (79°F).

Find more detailed climate information for Marin County in June here.

July is a summer month. The temperatures range from pleasant in Sausalito with 19°C (66°F) to high in Fairfax with 28°C (82°F).

Find more detailed climate information for Marin County in July here.

August is a summer month. The temperatures range from pleasant in Sausalito with 19°C (66°F) to high in Novato with 27°C (81°F).

Find more detailed climate information for Marin County in August here.

September is a summer month. The temperatures range from pleasant in Sausalito with 21°C (70°F) to high in Novato with 28°C (82°F). On average, this month is one of the warmest months of the year in Marin County. So be prepared and make sure to dress lightly.

Find more detailed climate information for Marin County in September here.

The temperatures range from pleasant in Sausalito with 20°C (68°F) to high in Novato with 24°C (75°F).

Find more detailed climate information for Marin County in October here.

In Novato you can expect pleasant maximum average daytime temperatures around 18°C (64°F) and nighttime temperatures around 7°C (45°F).

Find more detailed climate information for Marin County in November here.

December is a winter month. In Novato you can expect mild maximum average daytime temperatures around 14°C (57°F) and nighttime temperatures around 4°C (39°F). On average, this month is the coldest month of the year in Marin County.

Find more detailed climate information for Marin County in December here.