Vallejo

Planning your day in Vallejo? Here you'll find the latest weather information, along with current forecasts and helpful charts.

The climate in Vallejo is Mediterranean, characterized by distinct seasons. Visitors can expect warm, often hot, very dry summers and mild, wetter winters. This climate creates comfortable conditions for visiting almost year-round, although each season has its own unique features.

The summer months, especially from June to August, are marked by high temperatures, averaging 20-22°C, while maximum values can reach 28-29°C. A notable feature of the summer period is the almost total absence of precipitation. In contrast, winter brings more rain, especially from December to March, when the bulk of the precipitation falls, though still in small amounts (3-4 mm per month). Winter temperatures remain mild, with averages around 10-12°C, and rarely drop below 5-6°C. Spring and autumn are pleasant transitional seasons with moderate temperatures and light rainfall.

Vallejo experiences a noticeable shift in temperature regimes throughout the year, with warm summers and mild, cool winters. The annual range of average temperatures fluctuates from approximately 10.4°C in December to 21.7°C in August. The hottest months are typically July and August, when the average maximum temperature approaches 29°C. The coldest months are considered to be December and January, with an average minimum temperature of around 6°C, although February can show the lowest average monthly minimum temperature (5.8°C).

Summer months in Vallejo, especially from June to September, are characterized by pleasantly warm and even hot weather. Average daytime maximums during this period consistently stay above 27°C, peaking in August (29.0°C). An important feature of summer is the significant difference between day and night temperatures. For example, in July and August, nights bring a refreshing cool with temperatures around 14-14.5°C, creating comfortable conditions after the daytime heat. There is almost no rain in summer, highlighting the dry nature of this season.

Winter in Vallejo, spanning from December to February, is mild and cool, without severe frosts. Average daytime temperatures range from 14-16°C, while night temperatures drop to 6-7°C, rarely reaching freezing. As in summer, winter also sees fluctuations between day and night temperatures, though less pronounced than in the warm season—with a difference of about 8-10°C. Transitional seasons, spring and autumn, show a gradual change in temperatures, with pleasant warmth in April-May and October.

The city of Vallejo experiences a distinct seasonality in precipitation throughout the year, with a clear divide between wet and dry periods. The majority of precipitation falls during the winter months and early spring, while the summer is characterized by its near-total absence.

The wet season in Vallejo typically lasts from November to March. The highest precipitation occurs in January and December, with an average of 4 mm each, and the number of rainy days reaches 10 in each of these months. March is also quite a wet month with 3 mm of precipitation and the highest number of rainy days in the year—around 12. February (3 mm, 7 rainy days) and November (2 mm, 6 rainy days) complete the wet season profile. Given Vallejo's mild temperatures year-round, precipitation falls primarily as rain.

The dry season sets in by late spring and continues until early autumn. June, July, and August are absolutely dry months, with no recorded precipitation (0 mm and 0 rainy days). September also remains very dry, with a minimal probability of rain (0 mm, 1 rainy day). Transitional months such as April (1 mm, 4 rainy days), May (1 mm, 3 rainy days), and October (1 mm, 2 rainy days) are characterized by very light rainfall.

When planning a trip to Vallejo, it's important to consider its Mediterranean climate with mild, wet winters and warm, dry summers. Layering should be your key packing principle. In summer (June to August), daytime temperatures can reach 27-29°C, so light clothing such as t-shirts, shorts, and sundresses will be the most comfortable. Don't forget sunscreen, a hat, and sunglasses, as there is almost no rainfall during these months. Evenings can be cooler, so a light jacket or sweater will be useful.

In winter (December to February), the average temperature stays around 10-11°C, with possible drops to 5-6°C. You will need warmer items: sweaters, jeans or thick trousers, and a medium-weight jacket or coat. During this period, as well as in March, the highest amount of precipitation occurs (up to 10-12 rainy days per month), so a compact umbrella or a light waterproof jacket will come in very handy. In spring (March-May) and autumn (September-November), the weather is changeable: days can be warm, especially in May and September, but mornings and evenings are cool. It is recommended to have both light and warmer items to adapt to temperature changes.

Regardless of the season, comfortable walking shoes are a must-have, as you'll surely want to explore the city and its surroundings. Given the temperature fluctuations throughout the day, especially during transitional seasons, dress in layers so you can easily remove or add a layer of clothing. A small backpack or bag will be useful for day trips to carry water, sunscreen, an extra layer, or an umbrella.