Sunnyvale weather by month

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Sunnyvale, California: A Month-by-Month Weather Guide

Sunnyvale, California, nestled in the heart of Silicon Valley, enjoys a wonderfully mild Mediterranean climate. But even in paradise, there are seasonal shifts! Planning a visit or just curious about what to expect throughout the year? This comprehensive guide breaks down the Sunnyvale weather, month by month, so you can prepare accordingly. We’ll cover temperature trends, rainfall, sunshine hours, and what activities are best suited for each time of year.

#ff6900 Sunnyvale Weather Overview

Sunnyvale’s location benefits from the moderating influence of the San Francisco Bay. This keeps temperatures relatively stable, avoiding the extreme heat of inland California and the excessive chill of the coast. Summers are dry and warm, while winters are mild and wet. The ‘fog season’ – often experienced near the Bay – impacts Sunnyvale less intensely than areas directly on the waterfront.

#ff6900 Sunnyvale Weather by Month: A Detailed Look

Here’s a month-by-month breakdown of what you can expect weather-wise in Sunnyvale:

Month Average High (°F) Average Low (°F) Rainfall (inches) Sunshine Hours Humidity (%)
January 57 43 2.2 140 75
February 62 45 1.9 165 73
March 67 48 1.4 200 70
April 72 51 0.7 240 65
May 77 55 0.3 280 61
June 82 59 0.1 310 58
July 85 62 0.0 320 55
August 86 63 0.0 300 56
September 83 61 0.2 260 60
October 77 56 0.8 220 65
November 66 48 1.4 170 70
December 57 43 1.8 150 73

#ff6900 Spring (March – May): Blossoms and Mild Days

Spring is a beautiful time in Sunnyvale, as the landscape bursts into bloom. Expect pleasant daytime temperatures generally in the 60s and 70s, making it perfect for outdoor activities.

  • March: A transition month. Rainfall starts to decrease, and temperatures begin to climb. Great for hiking and enjoying the early wildflowers.

  • April: Warmer and drier, with temperatures consistently in the 70s. Ideal for exploring local parks like Las Palmas Park or Murphy Avenue.

  • May: Approaching summer warmth. Long, sunny days are ideal for biking, picnics, and outdoor events. The humidity remains comfortable.

#ff6900 Summer (June – August): Warm & Dry Sunshine

Summers in Sunnyvale are characterized by warm, dry weather. The Bay breeze often keeps things relatively comfortable, even when temperatures reach the mid-80s.

  • June: The dry season is firmly established. Warm days and pleasant evenings. Silicon Valley Pride celebrations often take place this month.

  • July & August: The hottest months of the year, but rarely uncomfortably hot. Perfect beach weather (a short drive away), outdoor concerts, and exploring the numerous tech museums. Expect minimal rainfall.

#ff6900 Autumn (September – November): Golden Hues & Comfortable Temperatures

Autumn brings a welcome return of cooler temperatures and a touch of moisture. The landscape transforms with golden colors, and the pace slows down.

  • September: Often considered one of the best months in Sunnyvale. Warm days, cool nights, and minimal rainfall. Excellent for wine tasting in the nearby Santa Cruz Mountains.

  • October: Temperatures continue to drop, but remain pleasant. A slight increase in rainfall. Halloween events are popular.

  • November: Cooler and wetter, marking the beginning of the rainy season. Good for cozy indoor activities and enjoying the fall foliage.

#ff6900 Winter (December – February): Mild & Wet

Winters in Sunnyvale are mild compared to many other parts of the country. Rainfall is the most significant weather feature, but extended periods of cold or snow are rare.

  • December: Cool and wet, with average highs in the upper 50s. Holiday festivities abound.

  • January & February: The wettest months of the year. Temperatures remain mild, typically in the 60s, but can dip into the 40s on colder nights. Good for museum visits, indoor shopping, and enjoying the quieter side of Silicon Valley.

#ff6900 What to Pack for Sunnyvale

No matter when you visit, layering is key. Here’s a general guideline:

  • Spring/Summer: Light clothing, a light jacket or sweater for evenings, sunscreen, a hat, and sunglasses.

  • Autumn/Winter: Waterproof jacket, warm layers, an umbrella, and comfortable walking shoes.

#ff6900 Frequently Asked Questions (FAQ)

  • Q: Does it ever snow in Sunnyvale?
    A: Very rarely. Snowfall is uncommon, and when it does occur, it’s usually light and doesn’t last long.

  • Q: What is the rainiest month in Sunnyvale?
    A: January is typically the rainiest month.

  • Q: Is Sunnyvale foggy?
    A: While the coastal fog can sometimes drift inland, Sunnyvale generally experiences less fog than San Francisco or areas directly on the Bay.

  • Q: What is the average humidity in Sunnyvale?
    A: The average humidity ranges from around 55% in the summer to 75% in the winter.

  • Q: Is Sunnyvale a good place to visit year-round?
    A: Yes! The mild climate makes it a desirable destination any time of the year, with something to offer everyone.

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