Average Rainy - Precipitation days in San Francisco

San Francisco sees 102 days of precipitation annually, totaling to 482 mm of rain. Learn more about it on this page.

Monthly Distribution of Rainy Days

Precipitation peaks in December with 74 mm falling over 13 rainy days. The driest period is July, receiving 1.5 mm across 2 rainy days.

Amsterdam Precipitation Days Compared World Wide

On average, San Francisco receives over 102 days of precipitation annually. For comparison, here is some data from popular tourist destinations around the world:

In Cairo, Egypt, there are only about 16 precipitation days annually, making it one of the driest capitals in the world.

Singapore, Singapore, records about 175 precipitation days per year, with rain spread fairly evenly throughout the year.

In Lisbon, Portugal, there are an average of 113 precipitation days annually, characterized by wet winters and dry summers typical of the Mediterranean climate.

In Toronto, Canada, there are about 126 precipitation days per year, with snowfall occurring in winter and rainfall in summer.

Osaka, Japan, experiences 198 precipitation days annually, with wetter summers compared to winter.

In Tokyo, Japan, the city sees around 181 precipitation days annually, with significant summer rains due to typhoon season.

Rain Facts From Around the Globe

Let’s explore more fascinating precipitation records:

• Tutunendo, Colombia, gets about 340 days of rain every year, which arguably makes it the wettest place in the world.
• On Réunion Island, a tropical cyclone generated 1825 mm in just 24 hours.
• Singapore receives thunder on 167 days in the year and is considered one of the most thunderous cities in the world.
• The smallest drops that fall are called drizzle drops, and they have a diameter of 0.5 mm.
• Some heavy storms generate "diamond dust," which consists of very small ice crystals that float in the air.

For more detailed information about rainfall patterns in San Francisco, visit our Rainfall & Precipitation page.