South San Francisco weather by month

South San Francisco, nestled between the vibrant city of San Francisco and the rolling hills of the Peninsula, enjoys a unique microclimate. While often cooler and foggier than its neighbor to the north, it offers a surprisingly pleasant year-round temperature. This guide provides a detailed look at the weather in South San Francisco, month by month, helping you plan your visits or simply understand what to expect throughout the year.

Overview of South San Francisco’s Climate

South San Francisco’s climate is considered Mediterranean, characterized by mild, wet winters and dry, cool summers. The Pacific Ocean significantly influences the weather, bringing in fog and keeping temperatures moderate. The city experiences less direct sunlight than inland areas, and the famous San Francisco fog often rolls in, particularly during the summer months. This fog, while sometimes obscuring views, contributes to the region’s distinctive charm and keeps temperatures comfortable. Expect consistent breezes, especially near the bay.

South San Francisco Weather by Month

Here’s a breakdown of the typical weather conditions you can expect in South San Francisco throughout the year:

Month	Avg High (°F)	Avg Low (°F)	Rainfall (inches)	Sunshine Hours	Humidity (%)
January	56	45	3.8	120	78
February	58	46	3.2	140	75
March	61	48	2.8	180	72
April	64	50	1.5	220	68
May	66	53	0.8	260	65
June	68	55	0.3	280	62
July	70	57	0.1	300	60
August	71	58	0.1	290	62
September	73	59	0.4	250	65
October	70	56	1.4	200	70
November	63	49	2.5	140	75
December	56	45	3.5	100	79

Note: These are average figures and can vary from year to year.

Detailed Monthly Weather Breakdown

January & February: These are the wettest months, with frequent rainfall and cooler temperatures. Expect gray skies and occasional strong winds. Layering is key! Average highs are in the mid-50s, dropping to the mid-40s at night.

March & April: The rain begins to taper off, and sunshine hours increase. Temperatures start to climb, with average highs reaching the low 60s. Wildflowers begin to bloom, adding color to the landscape.

May, June, & July: These are some of the driest and sunniest months. While temperatures are mild, the fog can still roll in, especially in the mornings and evenings. Average highs are in the upper 60s to low 70s. This is a great time for outdoor activities.

August & September: Often considered the warmest months, with average highs in the low 70s. The fog is less frequent, and the skies are generally clear. September often experiences “Indian Summer” conditions – warm, sunny days.

October & November: The weather transitions back to cooler temperatures and increased rainfall. The fog returns more frequently. Average highs are in the 60s, dropping to the 50s in November.

December: Similar to January and February, December is a wet and cool month. Expect frequent rain and gray skies. Average highs are in the mid-50s.

What to Pack for South San Francisco

Regardless of the time of year, layering is essential in South San Francisco. Here’s a general packing list:

Light jacket or fleece: Even in summer, evenings can be cool.

Waterproof jacket: Essential for the wetter months.

Comfortable walking shoes: For exploring the city and surrounding areas.

Sunscreen: Even on cloudy days, UV rays can penetrate.

Sunglasses: For those sunny breaks.

Layers: T-shirts, long-sleeved shirts, and sweaters.

Jeans or comfortable pants: Versatile for various activities.

**Frequently Asked Questions (FAQ)

Q1: Is South San Francisco always foggy?
A: No, while fog is common, especially during the summer, it’s not constant. Many days are sunny and clear.

Q2: What is the warmest month in South San Francisco?
A: September is typically the warmest month, with average highs in the low 70s.

Q3: What is the rainiest month in South San Francisco?
A: January is generally the rainiest month.

Q4: Is South San Francisco colder than San Francisco?
A: Generally, yes. South San Francisco tends to be a few degrees cooler due to its location and exposure to winds.

Q5: What’s the best time to visit South San Francisco for good weather?
A: September and October offer the best combination of warm temperatures, sunshine, and less fog.