Climate and monthly weather forecastKennewick, WA
Climate and monthly weather forecast
The climate of Kennewick
Positioned in the Pacific Northwest region of the United States, Kennewick, Washington, is characterized by a BSk or Mid-latitude steppe according to the Köppen climate classification. This type of climate blends semiarid conditions with moderate temperature ranges throughout the year.Temperature-wise, Kennewick experiences a moderately wide range, starting from lows of 28.8°F (-1.8°C) in January to highs of 90.1°F (32.3°C) in July. Humidity also displays a significant dispersion stretching from a high of 80% in January to a low of 35% in July. Alternatively, the annual swing in rainfall presents a less dramatic picture, with January and December attaining peaks of 0.94" (24mm) while July reports a minimal 0.2" (5mm).
Unique weather events are part of Kennewick's climatic model too, with snowfall, albeit limited, occurring exclusively in the colder months. Specifically, January records the highest snowfall of 1.02" (26mm), while the occurrence dwindles to barely 0.16" (4mm) in November. However, the city still basks under the sun for an extensive duration throughout the year, boasting up to 15.7 hours of daylight in June and an impressive 12.1 hours of sunshine in July.
The best time to visit Kennewick
Consequently, given the diverse weather patterns, the best time to visit Kennewick often hinges on the visitors’ preferences and the activities planned. Nonetheless, June through August would be highly recommended for the sun seekers and outdoor enthusiasts. These months present not only the warmest temperatures, peaking at 90.1°F (32.3°C) in July, but also the most prolonged daylight, reaching a whopping 15.7 hours in June combined with significantly lower rainfall levels than in other months.The worst time to visit Kennewick
Conversely, January and December are arguably the least favorable months for a visit to Kennewick. These months register the lowest temperatures, with January's 28.8°F (-1.8°C) being the coldest. Too, these months are laden with the highest relative humidity levels reaching 80% and 78% respectively. The rainfall experienced in these months is also most prolific, measuring 0.94" (24mm) on average.Spring weather in Kennewick
Spring, stretching from March to May, brings a beautiful divergence from the chill of winter in Kennewick. With temperatures climbing from 54.1°F (12.3°C) to the comfortable warmth of 73°F (22.8°C), and rainfall subsiding from 0.94" (24mm) to 0.67" (17mm), the city starts to dry up. The increase in hours of sunshine, from 7.7 hours to 11.1 hours, coupled with the gradual decrease in cloud cover, contributes to the delightful conditions.Summer weather in Kennewick
Summer in Kennewick, from June to August, is blissful and vibrant, boasting long, sunlit days and significantly diminished rainfall. With temperatures stretching from 80.1°F (26.7°C) to 90.1°F (32.3°C), the ambiance is invariably convivial. The days are longest in the year, delivering up to 15.7 hours of daylight in June. Sunshine is plentiful as well, with July basking in 12.1 hours of sunlight. The season also carries with it the least rainfall, with July only receiving a meager 0.2" (5mm).Autumn weather in Kennewick
Autumn months - September to November, witness a slide back to cooler conditions. As the temperatures dip gradually from 77.9°F (25.5°C) to 48.9°F (9.4°C), and rainfall slowly escalates from 0.24" (6mm) to 0.63" (16mm), Kennewick slowly dons a wetter and colder outlook. While the daylight hours reduce, there remains substantial sunlight, with November still lavishing in 6.2 hours of sunshine.Winter weather in Kennewick
Winter in Kennewick, running from December through February, is particularly cold with temperatures fluctuating between a low of 28.8°F (-1.8°C) to a high of 45.1°F (7.3°C). Rainfall tallies are highest in this period, with both January and December recording an identical rainfall of 0.94" (24mm). While snowfall is not an everyday affair, December sees about 1.57" (40mm) of snowfall. Daylight, however, is at its least, with December only receiving 8.7 hours.Weather in January
January has the coldest days of the year in Kennewick, Washington, with low temperatures sagging down to around 28.8°F (-1.8°C). The city, nestled in the southeast of the state, experiences brisk, cool winds averaging 6.3mph (10.1km/h). Weather in January »Weather in February
Kennewick experiences a slight rise in temperature in February as winter starts to loosen its grip. The highest temperature tends to be around 45.1°F (7.3°C). It is, however, still a cold month, with the second highest snowfall of the year. Weather in February »Weather in March
March ushers in early signs of springs in Kennewick, with the weather becoming more forgiving. The city encounters a notable leap in terms of temperatures, with highs soaring to about 54.1°F (12.3°C).Humidity levels start to drop and winds gain momentum, making the outdoors more pleasant. Weather in March »Weather in April
The transition from March to April in Kennewick brings warmer temperatures and longer days. A significant warmth envelops the city, with high temperatures around 63.1°F (17.3°C). This is the time when the city truly steps into spring; flowering plants sprout, adding color to the city. Weather in April »Weather in May
Urban and natural beauty merge in Kennewick in May, marked by comfortable weather and lush landscapes. The city sees an upward trend in temperatures, with the thermometer indicating highs of around 73°F (22.8°C). This month, rain chances do not fade completely but drop significantly making room for more sunny days. Weather in May »Weather in June
Kennewick steps into summer in June and temperatures noticeably increase. The city experiences a transition to warmer days with a high of nearly 80.1°F (26.7°C). It is an ideal month to enjoy the summer sun, with longer daylight hours and minimal cloud cover. Weather in June »Weather in July
July is the hottest month in Kennewick, providing quintessential summer weather. Temperatures frequently rise to around 90.1°F (32.3°C). It is the month with the least chances of rainfall, translating to clear, sunny days perfect for picnics and park strolls. Weather in July »Weather in August
As in July, Kennewick still basks in warmth through August, with temperatures typically around 89.2°F (31.8°C). Despite being on the heels of the city's hottest month, rainfall does make a minimal increase. Humidity levels, too, see a slight rise. Weather in August »Weather in September
September marks the arrival of fall in Kennewick, but summer’s warmth lingers with highs of around 77.9°F (25.5°C). It’s a noticeable change from the scorching summer, but still comfortable enough for outdoor fun. Nighttime starts coming a bit earlier, inviting cool breezes into the still-warm days. Weather in September »Weather in October
October sees a further dip in temperatures, as fall begins to cast a chilly spell on Kennewick. The mercury drops to a maximum of 62.6°F (17°C). The gradual transition towards colder months prepares the city for the upcoming winter. Weather in October »Weather in November
November greets Kennewick with the chill of late fall, featuring temperatures sliding down to about 48.9°F (9.4°C). The city prepares for winter, as November serves as a preamble for the colder months ahead. The daylight hours shrink, giving way to longer nights and an increased likelihood of precipitation. Weather in November »Weather in December
December turns Kennewick into a winter wonderland with lows around 27.9°F (-2.3°C). There is an increased likelihood of snowfall, adding to the holiday season's charm. It is the perfect time for a warm cup of cocoa or a fireplace stories session, cocooned from the cold outside. Weather in December »Updated: Jul 15, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January is the most humid month, with an average relative humidity of 80%.
In Kennewick, Washington, during the entire year, the rain falls for 102.8 days and collects up to 7.32" (186mm) of precipitation.
January through March, November and December are months with snowfall.
In Kennewick, during the entire year, snow falls for 9.7 days and aggregates up to 5.2" (132mm) of snow.
January has the least sunshine of the year, with an average of 5.4h of sunshine.
The months with the lowest UV index in Kennewick are January, February, November and December, with an average maximum UV index of 2.
February is the month with the most snowfall. Snow falls for 2.7 days and accumulates 2.2" (56mm) of snow.
The wettest months are March and December, with an average 0.94" (24mm) of rainfall.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
In Kennewick, snow does not fall in April through October.
June has the longest days of the year, with an average of 15h and 42min of daylight.
The warmest temperatures occur during July, when averages reach a peak of 90.1°F (32.3°C) and a low of 62.6°F (17°C).
July is the least humid month, with an average relative humidity of 35%.
The month with the least rainfall is July, when the rain falls for 3.5 days and typically collects 0.2" (5mm) of precipitation.
The month with the most sunshine is July, with an average of 12.1h of sunshine.
The month with the highest UV index is July, with an average maximum UV index of 7.
The coldest time of the year is December, with temperatures averaging a high of 38.3°F (3.5°C) and a low of 27.9°F (-2.3°C).
The month with the shortest days is December, with an average of 8h and 42min of daylight.
Average temperature
Kennewick, WA
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (38.3°F).
The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).
Average pressure
Kennewick, WA
- Average pressure in January:
30.19"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.95"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.16"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed
Kennewick, WA
- Average wind speed in January:
6.3mph - Average wind speed in February:
7mph - Average wind speed in March:
8.1mph - Average wind speed in April:
8.5mph - Average wind speed in May:
7.5mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
6.7mph - Average wind speed in August:
6.4mph - Average wind speed in September:
6.7mph - Average wind speed in October:
6.7mph - Average wind speed in November:
6.8mph - Average wind speed in December:
5.8mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).
Average humidity
Kennewick, WA
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (35%).
Average rainfall
Kennewick, WA
- Average rainfall in January:
0.91" - Average rainfall in February:
0.87" - Average rainfall in March:
0.94" - Average rainfall in April:
0.55" - Average rainfall in May:
0.67" - Average rainfall in June:
0.47"
- Average rainfall in July:
0.2" - Average rainfall in August:
0.24" - Average rainfall in September:
0.24" - Average rainfall in October:
0.67" - Average rainfall in November:
0.63" - Average rainfall in December:
0.94"
The wettest months (with the highest rainfall) are March and December (0.94").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days
Kennewick, WA
- Average rainfall days in January:
10.8 days - Average rainfall days in February:
8.7 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
10.1 days - Average rainfall days in May:
8.9 days - Average rainfall days in June:
7.2 days
- Average rainfall days in July:
3.5 days - Average rainfall days in August:
3.8 days - Average rainfall days in September:
4.6 days - Average rainfall days in October:
9.9 days - Average rainfall days in November:
10.5 days - Average rainfall days in December:
11.5 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (3.5 days).
Average snowfall
Kennewick, WA
The month with the highest snowfall is February (2.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Kennewick, WA
- Average snowfall days in January:
2.3 days - Average snowfall days in February:
2.7 days - Average snowfall days in March:
0.8 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.8 days - Average snowfall days in December:
3.1 days
The month with the highest number of snowfall days is December (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Kennewick, WA
- Average daylight in January:
9h and 6min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 42min
- Average daylight in July:
15h and 18min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 24min - Average daylight in December:
8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in January:
5h and 24min - Average sunshine in February:
5h and 42min - Average sunshine in March:
7h and 42min - Average sunshine in April:
10h and 12min - Average sunshine in May:
11h and 6min - Average sunshine in June:
11h and 24min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 42min - Average sunshine in October:
6h and 48min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 30min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days
Kennewick, WA
- Average sunshine days in January:
16.4 days - Average sunshine days in February:
15.5 days - Average sunshine days in March:
15.4 days - Average sunshine days in April:
17.9 days - Average sunshine days in May:
19.8 days - Average sunshine days in June:
20.9 days
- Average sunshine days in July:
25.7 days - Average sunshine days in August:
24.6 days - Average sunshine days in September:
24 days - Average sunshine days in October:
19.4 days - Average sunshine days in November:
16.7 days - Average sunshine days in December:
16 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (15.4 days).
Average UV index
Kennewick, WA
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Kennewick, WA
The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility
Kennewick, WA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
