Vallejo weather by month

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Vallejo, California, nestled in the heart of Solano County, enjoys a Mediterranean climate characterized by warm, dry summers and mild, wet winters. Its location in the San Francisco Bay Area offers a unique blend of weather patterns, influenced by both the Pacific Ocean and the inland valleys. Planning a visit or simply curious about what to expect throughout the year? This comprehensive guide breaks down Vallejo’s weather, month by month.

Vallejo Weather Overview

Vallejo benefits from moderate temperatures year-round. While it doesn’t experience the extreme heat of inland California, it’s also shielded from the coldest winter temperatures by the bay. Fog is a common occurrence, particularly during the summer months, and can significantly impact daytime temperatures. The "marine layer" as locals call it, typically burns off by midday, but can linger longer in certain areas. Understanding these nuances is key to enjoying your time in Vallejo.

Vallejo Weather by Month: A Detailed Look

Here’s a detailed breakdown of the average weather conditions in Vallejo throughout the year:

Month Avg High (°F) Avg Low (°F) Precipitation (in) Humidity (%) Sunshine (hours)
January 54 42 3.4 78 120
February 58 44 2.8 75 140
March 63 46 2.1 72 180
April 68 49 0.9 68 220
May 73 53 0.4 65 270
June 77 57 0.2 63 290
July 81 60 0.1 61 310
August 82 61 0.1 62 300
September 79 59 0.4 66 250
October 73 53 1.3 70 200
November 63 46 2.1 74 150
December 55 43 2.8 77 130

January: The coolest month of the year. Expect frequent rainfall and overcast skies. Average high is around 54°F (12°C) and low around 42°F (6°C).

February: Similar to January, with continued rainfall and moderate temperatures. The chance of sunshine begins to increase slightly.

March: Transition month – the rain starts to taper off, and temperatures begin to climb. Wildflowers start to bloom.

April: Pleasant and mild. Rainfall is minimal, and you can expect more consistently sunny days. Perfect for outdoor activities.

May: Warm and sunny, with very little rain. The marine layer often starts to develop, keeping mornings and evenings cooler.

June: Officially the start of summer! Temperatures continue to rise, with warm, dry conditions dominating. Fog can be common, especially near the water.

July: The hottest month in Vallejo. Though generally dry, occasional heat waves can push temperatures into the 90s°F (32°C+).

August: Similar to July, maintaining warm and dry conditions. The marine layer provides some relief during the hotter parts of the day.

September: Often considered the best month weather-wise. Warm days, cooler evenings, and generally clear skies.

October: A beautiful month with mild temperatures and a decreasing chance of rainfall. Fall colors begin to appear.

November: The return of the rain season. Temperatures cool down, and the landscape becomes lush again.

December: Cool and wet, with the possibility of occasional strong storms. Festive holiday events often take place indoors.

What to Pack for Vallejo

Given the diverse weather patterns, packing for Vallejo requires a little forethought:

  • Layers: Essential for all seasons. Temperatures can fluctuate significantly throughout the day.

  • Light Jacket or Sweater: Even in summer, evenings can get cool, especially with the fog.

  • Rain Gear (October – May): An umbrella or waterproof jacket is a must during the wetter months.

  • Sunscreen and Hat (April – September): Protect yourself from the sun during the warmer, clearer periods.

  • Comfortable Walking Shoes: Vallejo is a great city to explore on foot.

FAQ About Vallejo Weather

1. Is Vallejo foggy?
Yes, especially during the summer months. The marine layer often brings fog to Vallejo, particularly in the mornings and evenings.

2. What is the rainiest month in Vallejo?
January is typically the rainiest month, with an average of 3.4 inches of precipitation.

3. What is the hottest month in Vallejo?
July is the hottest month, with an average high of 81°F (27°C).

4. Does Vallejo get snow?
It is extremely rare for Vallejo to get snow. While snow can sometimes be seen on the higher peaks surrounding the city, snowfall in Vallejo is virtually unheard of.

5. Is Vallejo windier than other Bay Area cities?
Vallejo can experience stronger winds than some more sheltered areas of the Bay Area, due to its proximity to the Carquinez Strait.

Resources for Vallejo Weather Information

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