Climate and monthly weather forecastSunnyside, WA
Climate and monthly weather forecast
Weather in January
January, like December, in Sunnyside, Washington, is a wintry winter month, with an average temperature fluctuating between 36.5°F (2.5°C) and 26.6°F (-3°C). On the advent of January, Sunnyside's average high-temperature exhibits a minor adjustment to a still cold 36.5°F (2.5°C) from December's 36.1°F (2.3°C). Weather in January »Weather in February
The last month of the winter, February, is also a wintry month in Sunnyside, Washington, with an average temperature varying between 29.8°F (-1.2°C) and 42.1°F (5.6°C). The start of February brings a subtle rise in the average high-temperature, moving from a wintry 36.5°F (2.5°C) in January to a still cold 42.1°F (5.6°C). Weather in February »Weather in March
March, the first month of the spring in Sunnyside, is a cool month, with an average temperature varying between 35.8°F (2.1°C) and 50.9°F (10.5°C). With the beginning of March, Sunnyside's average high-temperature sees a minor increase, transitioning from an icy 42.1°F (5.6°C) in February to a cool 50.9°F (10.5°C). Weather in March »Weather in April
April in Sunnyside, Washington, is a moderate spring month, with an average temperature varying between 60.4°F (15.8°C) and 41.4°F (5.2°C). The arrival of April brings an increase in high-temperatures, moving from a cool 50.9°F (10.5°C) in March to a moderate 60.4°F (15.8°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Sunnyside, Washington, with an average temperature ranging between max 70.3°F (21.3°C) and min 48.7°F (9.3°C). With the onset of May, Sunnyside's weather sees a temperature rise, transitioning from a mild 60.4°F (15.8°C) in April to a pleasant 70.3°F (21.3°C). Weather in May »Weather in June
June, the first month of the summer in Sunnyside, is a warm month, with an average temperature ranging between min 54.1°F (12.3°C) and max 77.7°F (25.4°C). The beginning of June signals a minor rise in the average high-temperature, moving from an agreeable 70.3°F (21.3°C) in May to a warm 77.7°F (25.4°C). Weather in June »Weather in July
July is a hot summer month in Sunnyside, Washington, with an average temperature ranging between min 60.8°F (16°C) and max 87.1°F (30.6°C). The warmest period tends to be July, when average temperatures fluctuate between a high of 87.1°F (30.6°C) and a low of 60.8°F (16°C). Weather in July »Weather in August
The last month of the summer, August, is another tropical month in Sunnyside, Washington, with an average temperature varying between 61.5°F (16.4°C) and 86.2°F (30.1°C). The advent of August brings an average high-temperature of a still hot 86.2°F (30.1°C), exhibiting minor difference from the previous month. Weather in August »Weather in September
September, the first month of the autumn in Sunnyside, is still a warm month, with an average temperature ranging between min 54.9°F (12.7°C) and max 75.4°F (24.1°C). The average high-temperature decreases in September, shifting from a hot 86.2°F (30.1°C) in August to a warm 75.4°F (24.1°C). Weather in September »Weather in October
October, like September, is a moderate autumn month in Sunnyside, Washington, with an average temperature ranging between min 44.1°F (6.7°C) and max 60.1°F (15.6°C). October marks a distinct drop in the average high-temperature, descending from September's moderately hot 75.4°F (24.1°C) to a refreshing 60.1°F (15.6°C). Weather in October »Weather in November
November, the last month of the autumn in Sunnyside, is also a frosty month, with temperature in the range of an average high of 46.6°F (8.1°C) and an average low of 33.6°F (0.9°C). Sunnyside in November demonstrates a small temperature transition, adjusting from an average high of a moderate 60.1°F (15.6°C) in October to a frosty 46.6°F (8.1°C). Weather in November »Weather in December
December, the first month of the winter in Sunnyside, is also a wintry month, with temperature in the range of an average low of 25.3°F (-3.7°C) and an average high of 36.1°F (2.3°C). December, having an average high-temperature of 36.1°F (2.3°C) and an average low-temperature of 25.3°F (-3.7°C), is the coldest month. Weather in December »Updated: Jul 7, 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
With an average relative humidity of 83%, January is the most humid month.
Throughout the year, there are 104.5 rainfall days, and 8.23" (209mm) of precipitation is accumulated.
January through March, September, November and December are months with snowfall.
In Sunnyside, during the entire year, snow falls for 15.6 days and aggregates up to 7.36" (187mm) of snow.
With an average of 4.9h of sunshine, January has the least sunshine of the year.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
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 Sunnyside, snow does not fall in April through August and October.
May is the month with the most rainfall. Rain falls for 10.3 days and accumulates 1.1" (28mm) of precipitation.
June has the longest days of the year, with an average of 15h and 42min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
Sunnyside's temperatures tend to reach their peak averages in July, with a high of 87.1°F (30.6°C) and a low of 60.8°F (16°C).
The months with the lowest humidity are July and August, with an average relative humidity of 38%.
The month with the least rainfall is July, when the rain falls for 4.1 days and typically collects 0.24" (6mm) of precipitation.
July and August, with an average of 12h of sunshine, are months with the most sunshine.
With its average high temperature of 36.1°F (2.3°C) and a low of 25.3°F (-3.7°C), December is regarded as the coldest month.
December is the month with the most snowfall. Snow falls for 5 days and accumulates 2.24" (57mm) of snow.
December has the shortest days of the year, with an average of 8h and 42min of daylight.
Average temperature
Sunnyside, WA
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (36.1°F).
The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (25.3°F).
Average pressure
Sunnyside, WA
- Average pressure in January:
30.17"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:
29.96"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed
Sunnyside, WA
- Average wind speed in January:
5.2mph - Average wind speed in February:
6.1mph - Average wind speed in March:
7.3mph - Average wind speed in April:
8.3mph - Average wind speed in May:
7.5mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.6mph - Average wind speed in September:
6.6mph - Average wind speed in October:
6.2mph - Average wind speed in November:
6mph - Average wind speed in December:
5mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is December (5mph).
Average humidity
Sunnyside, WA
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (38%).
Average rainfall
Sunnyside, WA
- Average rainfall in January:
1.06" - Average rainfall in February:
0.79" - Average rainfall in March:
0.83" - Average rainfall in April:
0.51" - Average rainfall in May:
1.1" - Average rainfall in June:
0.63"
- Average rainfall in July:
0.24" - Average rainfall in August:
0.31" - Average rainfall in September:
0.35" - Average rainfall in October:
0.75" - Average rainfall in November:
0.59" - Average rainfall in December:
1.06"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days
Sunnyside, WA
- Average rainfall days in January:
10.8 days - Average rainfall days in February:
8.3 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
10.4 days - Average rainfall days in May:
10.3 days - Average rainfall days in June:
7.1 days
- Average rainfall days in July:
4.1 days - Average rainfall days in August:
4.4 days - Average rainfall days in September:
5.5 days - Average rainfall days in October:
9.8 days - Average rainfall days in November:
10.1 days - Average rainfall days in December:
10.4 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (4.1 days).
Average snowfall
Sunnyside, WA
The month with the highest snowfall is December (2.24").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days
Sunnyside, WA
- Average snowfall days in January:
4.6 days - Average snowfall days in February:
3.6 days - Average snowfall days in March:
1.1 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:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
1.2 days - Average snowfall days in December:
5 days
The month with the highest number of snowfall days is December (5 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight / Average sunshine
Sunnyside, 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 24min - 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:
4h and 54min - Average sunshine in February:
5h and 24min - Average sunshine in March:
7h and 30min - Average sunshine in April:
9h and 54min - Average sunshine in May:
10h and 42min - Average sunshine in June:
11h and 30min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 42min - Average sunshine in October:
6h and 36min - Average sunshine in November:
6h and 0min - Average sunshine in December:
5h and 6min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days
Sunnyside, WA
- Average sunshine days in January:
15.9 days - Average sunshine days in February:
15.8 days - Average sunshine days in March:
15.4 days - Average sunshine days in April:
17.2 days - Average sunshine days in May:
18.7 days - Average sunshine days in June:
21.1 days
- Average sunshine days in July:
26.2 days - Average sunshine days in August:
24 days - Average sunshine days in September:
22.6 days - Average sunshine days in October:
19.3 days - Average sunshine days in November:
17.3 days - Average sunshine days in December:
16.2 days
The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is March (15.4 days).
Average UV index
Sunnyside, WA
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Sunnyside, WA
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility
Sunnyside, WA
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
