Kennewick

Planning your day in Kennewick? Here you will find the latest weather information, including real-time data and forecasts, to ensure your stay is as comfortable as possible.

The climate in Kennewick, Washington, is classified as semi-arid with four distinct seasons. The city experiences significant temperature fluctuations throughout the year. Summers are typically hot and very dry, while winters are cold, with temperatures frequently dropping to or below freezing.

Spring and autumn in Kennewick are transitional seasons with milder temperatures. One of the key features of the climate is the low level of precipitation year-round, especially during the summer months when rainy days are nearly non-existent. The highest number of days with precipitation occurs during the winter, although the total amount remains small. This creates conditions for mostly sunny weather, particularly from late spring to early autumn.

Kennewick experiences a pronounced annual temperature cycle with hot summers and cool winters. The hottest months are typically July, with an average temperature of 27.8°C and maximums reaching 36.3°C, and August, with an average temperature of 26.8°C and highs up to 35.0°C. The coldest months are December (average temperature 2.4°C, minimum -0.8°C) and January (average temperature 3.2°C, minimum -0.6°C), when nighttime temperatures drop below freezing.

The summer period in Kennewick is characterized by dry heat. From June to August, daytime temperatures often exceed 30°C, and in July and August, they can reach 35-36°C. Nights bring some relief but remain warm, with minimum temperatures ranging from 15-19°C. A significant difference between day and night temperatures (up to 15-17°C) is a hallmark of the summer months, typical for regions with low humidity and little rainfall during this time of year.

Winter in Kennewick is cool. Average daytime temperatures from December to February hover around 5-8°C, while nighttime temperatures regularly drop below zero, reaching -0.6°C in January and -1.3°C in February. This means that frost and icy conditions are quite common. Spring and autumn are transitional months, with temperatures gradually rising in spring (March-May) and falling in autumn (September-November). For example, by May, the average temperature is a comfortable 19.1°C, while in October, it drops to 13.4°C.

The city of Kennewick experiences a very dry climate throughout the year, with extremely low precipitation levels. However, there are periods with a slightly higher chance of rain and months that are almost entirely dry. The summer months, particularly from June to September, are characterized as a distinct dry season. During this time, rainfall is minimal, and in July, it is virtually non-existent.

The highest number of days with precipitation occurs in the winter months—January and December—with about 10 "wet" days each, and November with approximately 8 days. Despite the frequency, the total volume of precipitation remains very low, at only about 1 mm per month. Given that minimum temperatures in January, February, and December drop below freezing, precipitation during these months may fall as light snow or freezing drizzle, while in other months, it is more likely to be light rain.

Thus, the "wettest" months in Kennewick in terms of frequency are January and December. The driest month is July, when precipitation is practically absent—averaging 0 mm and 0 days of rain. June, August, and September are also very dry, with zero rainfall and only a few days when any might be observed. Overall, even during periods with the highest probability of precipitation, it is sporadic and very light in nature.

When planning a trip to Kennewick, it is important to consider its climate to ensure you pack correctly. The city features hot, dry summers and cool, occasionally damp winters. In summer, especially from June to August, when average temperatures can rise above 30-35°C, you will need light and breathable clothing: t-shirts, shorts, and sundresses, along with a hat, sunglasses, and high-SPF sunscreen. Despite rare rainfall, evenings can be cooler, so a light sweater or cardigan is a good idea.

The winter months, from December to February, bring average temperatures around 2-3°C with overnight frosts. During this period, it is worth bringing warm clothing: sweaters, fleeces, an insulated jacket, a hat, gloves, and a scarf. Although total precipitation is minimal, the number of "wet days" increases, so waterproof shoes and a light rain jacket or umbrella may be useful. Spring (March-May) and autumn (September-November) are transitional seasons with a wide range of temperatures. March and November are still quite chilly, while May and September offer warm and pleasant weather. Layering is ideal for these periods: t-shirts, long-sleeve shirts, light sweaters, and jackets that can be combined depending on the conditions.

Regardless of the season, comfortable walking shoes are a must, as you will likely want to explore the city and its surroundings. Given the low overall humidity and minimal rainfall throughout the year, your main focus when packing should be on temperature management and sun protection in the summer. A power adapter may also be necessary if you are traveling from a country with different outlet standards.