Napa

Find out the current weather in Napa! In this section, we have gathered the latest data, forecasts, and helpful weather charts to help you plan your day or trip.

Napa, located in the USA, has a climate that can be described as Mediterranean. This means you can expect warm, dry, and sunny summer months and mild, wetter winters. The seasons are quite distinct, allowing you to enjoy a variety of weather conditions throughout the year.

Summer, especially from June to August, features high daytime temperatures, often reaching 30-32°C, and minimal precipitation—in fact, there is virtually no rain during these months. Winter, on the other hand, brings more precipitation, especially in December, January, and March, although temperatures remain moderate, with averages around 10-11°C and rare frosts. Spring and autumn are pleasant transitional periods with comfortable temperatures and a gradual change in humidity levels.

Overall, the weather in Napa is favorable for visiting most of the year. If you prefer hot and sunny weather, summer is the ideal time. For those looking for milder temperatures and fewer tourists, spring and autumn offer excellent conditions. In winter, you should be prepared for rain, but extreme cold is a rarity here.

The temperature regime in Napa is characterized by significant seasonal fluctuations. The hottest months are July and August, when the average temperature stays around 23.3–23.4°C. The coolest months are December and January, with average temperatures of about 10.0–10.3°C. Overall, the annual range of average maximum daytime temperatures extends from 14.5°C in December to a sweltering 31.7°C in July, while average nightly minimums can drop to 5.1°C in February and rise to 15.3°C in August.

Summer months in Napa, from June to August, bring real heat, especially during the day. Average maximum temperatures regularly rise above 29°C, peaking in July (31.7°C) and August (31.5°C). Nights remain warm and comfortable, with average minimum temperatures in the 14.1–15.3°C range. A characteristic feature of the summer period is significant daily temperature fluctuations: the difference between the daytime high and the nightly low can reach 15–17°C. This means that even after a very hot day, the evening and night can bring a pleasant coolness.

Winter in Napa, spanning from December to February, is mild and moderate. Average daytime maximum temperatures in these months range from 14.5°C (December) to 16.5°C (February), making daytime walks quite comfortable. At night, the temperature drops on average to 5.1–5.8°C, which may feel fresh or cool, but severe frosts are untypical for the region. Daily temperature fluctuations in winter are less pronounced than in summer but are still noticeable, averaging 9–11°C.

Napa experiences distinct seasonality in the distribution of precipitation throughout the year. The climate is characterized by dry, warm summers and wetter, mild winters. Given the average monthly temperatures, precipitation here falls mainly as rain; snowfall is not typical for this region.

The summer months, specifically June, July, and August, are completely dry—during this period, the amount of precipitation is 0 mm, and no rainy days are recorded. September is also very dry, with zero precipitation and only one potential day of rain. Transitional months like May and October also feature extremely low precipitation levels (around 1 mm) and a small number of rainy days (2–3 days).

The bulk of the rainfall occurs during the winter period. The wettest months by precipitation volume are January, February, and December, when an average of 4 mm falls. In terms of frequency, March stands out with about 12 rainy days (at 3 mm of precipitation), followed by January and December (10 rainy days each). November also brings a noticeable amount of moisture (2 mm of precipitation and approximately 6 rainy days). Overall, even in the wettest months, the total precipitation remains low, indicating mostly light or moderate rain.

When planning a trip to Napa, it is important to consider its Mediterranean climate with distinct seasons to ensure your luggage is packed optimally. For the summer months (June–August), when daytime temperatures often rise to 30-32°C and precipitation is virtually non-existent, pack light and breathable clothing: t-shirts, shorts, and sundresses made of natural fabrics. Be sure to bring sunscreen with a high SPF, a head covering (a hat or cap), and high-quality sunglasses. Given that evenings can be quite cool even after a hot day, a light jacket, cardigan, or sweater will be very useful. In the warm months of spring (such as May) and autumn (September, October), light clothing is also handy, but it is worth adding a few long-sleeved items and a light jacket for fresher weather or evening strolls.

Winter months (December–February) and cooler off-season periods, such as March and November, are mild in Napa, with average temperatures around 10-13°C. During this time, the number of rainy days increases, though the rainfall is usually not heavy. The key principle for your wardrobe should be layering: bring t-shirts, long-sleeved shirts, warm sweaters or fleece jackets, as well as a medium-weight jacket, preferably water-repellent or windproof. A small folding umbrella or a light raincoat may also come in handy. Regardless of the season, comfortable walking shoes are an absolute necessity, as you will surely want to explore the wineries and enjoy the scenic landscapes of Napa. Also, don't forget a reusable water bottle to stay hydrated during your adventures.