Climate and monthly weather forecastUnion, WA
Climate and monthly weather forecast
Weather in January
January in Union, Washington, is a frosty winter month, with an average temperature ranging between max 43.7°F (6.5°C) and min 33.6°F (0.9°C). The arrival of January coincides with an average high-temperature of a frosty 43.7°F (6.5°C), indicating a minimal shift from December's 41.5°F (5.3°C). Weather in January »Weather in February
The last month of the winter, February, is also a frosty month in Union, Washington, with an average temperature ranging between min 32.7°F (0.4°C) and max 44.8°F (7.1°C). The beginning of February reveals an average high-temperature of a still chilly 44.8°F (7.1°C), showing minimal deviation from the previous month. Weather in February »Weather in March
The first month of the spring, March, is still a chilly month in Union, Washington, with an average temperature varying between 49.1°F (9.5°C) and 34.5°F (1.4°C). The arrival of March brings an average high-temperature of a still frosty 49.1°F (9.5°C), subtly diverging from February's 44.8°F (7.1°C). Weather in March »Weather in April
April in Union, Washington, is a fresh spring month, with an average temperature varying between 54.9°F (12.7°C) and 37°F (2.8°C). April signals a minor shift in the average high-temperature, moving from March's frosty 49.1°F (9.5°C) to a fresh 54.9°F (12.7°C). Weather in April »Weather in May
The last month of the spring, May, is a refreshing month in Union, Washington, with an average temperature fluctuating between 41.4°F (5.2°C) and 63.9°F (17.7°C). May indicates a change in the average high-temperature, moving up from a cool 54.9°F (12.7°C) in April to a refreshing 63.9°F (17.7°C). Weather in May »Weather in June
June, the first month of the summer in Union, is a pleasant month, with an average temperature fluctuating between 45.5°F (7.5°C) and 68.5°F (20.3°C). Union marks the start of June with an average high-temperature of a pleasant 68.5°F (20.3°C), hinting at a slight fluctuation from May's 63.9°F (17.7°C). Weather in June »Weather in July
July is a warm summer month in Union, Washington, with an average temperature varying between 75.9°F (24.4°C) and 48.9°F (9.4°C). Union experiences a minor temperature shift with the start of July, with average high-temperatures moving from a pleasant 68.5°F (20.3°C) in June to a warm 75.9°F (24.4°C). Weather in July »Weather in August
August, the last month of the summer in Union, is another warm month, with an average temperature fluctuating between 50.4°F (10.2°C) and 76.6°F (24.8°C). August is the month when Union's temperatures reach their peak, with averages of 76.6°F (24.8°C) and lows of 50.4°F (10.2°C). Weather in August »Weather in September
The first month of the autumn, September, is also an agreeable month in Union, Washington, with an average temperature ranging between max 68.9°F (20.5°C) and min 47.5°F (8.6°C). With September's onset, the weather reveals a slight temperature decrease, transitioning from a warm 76.6°F (24.8°C) in August to an agreeable 68.9°F (20.5°C). Weather in September »Weather in October
October, the same as September, in Union, Washington, is a moderate autumn month, with an average temperature ranging between max 57.6°F (14.2°C) and min 41.9°F (5.5°C). October's arrival corresponds with a decrease in average high-temperatures, from September's agreeable 68.9°F (20.5°C) to a moderate 57.6°F (14.2°C). Weather in October »Weather in November
November, the last month of the autumn in Union, is also a frosty month, with an average temperature fluctuating between 37.2°F (2.9°C) and 47.3°F (8.5°C). November is characterized by a reduction in the average high-temperature, from a moderate 57.6°F (14.2°C) in October to a chilly 47.3°F (8.5°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in Union, Washington, with temperature in the range of an average high of 41.5°F (5.3°C) and an average low of 32.9°F (0.5°C). December, with average temperatures reaching a high of 41.5°F (5.3°C) and a low of 32.9°F (0.5°C), is the coldest month. Weather in December »Updated: Feb 14, 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
The month with the most rainfall in Union, Washington, is January, when the rain falls for 18.8 days and typically aggregates up to 7.24" (184mm) of precipitation.
Throughout the year, in Union, Washington, there are 185.4 rainfall days, and 42.87" (1089mm) of precipitation is accumulated.
January through March, November and December are months with snowfall in Union.
In Union, Washington, during the entire year, snow falls for 9.1 days and aggregates up to 5.59" (142mm) of snow.
The months with the lowest UV index in Union are January, February, November and December, with an average maximum UV index of 2.
February is the month with the most snowfall in Union. Snow falls for 3.3 days and accumulates 2.17" (55mm) of snow.
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 Union, Washington, snow does not fall in April through October.
June has the longest days of the year in Union, Washington, with an average of 15h and 54min of daylight.
The months with the highest UV index in Union, Washington, are June and July, with an average maximum UV index of 5.
The least humid month is July, with an average relative humidity of 72%.
The month with the least rainfall in Union, Washington, is July, when the rain falls for 7.1 days and typically collects 0.43" (11mm) of precipitation.
August stands out as Union's warmest month, with temperatures ranging between an average high of 76.6°F (24.8°C) and a low of 50.4°F (10.2°C).
The month with the most sunshine in Union, Washington, is August, with an average of 10.7h of sunshine.
The months with the highest humidity in Union are November and December, with an average relative humidity of 90%.
Union's December weather reaches an average high of 41.5°F (5.3°C) and an average low of 32.9°F (0.5°C), making it the coldest month.
With an average of 8h and 30min of daylight, December has the shortest days of the year in Union.
The month with the least sunshine is December, with an average of 3.5h of sunshine.
Average temperature
Union, WA
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (41.5°F).
The month with the highest average low temperature is August (50.4°F).
The coldest month (with the lowest average low temperature) is February (32.7°F).
Average pressure
Union, WA
- Average pressure in January:
30.08"Hg - Average pressure in February:
30.05"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30.06"Hg - Average pressure in May:
30.04"Hg - Average pressure in June:
30.05"Hg
- Average pressure in July:
30.06"Hg - Average pressure in August:
30.03"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30.06"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed
Union, WA
- Average wind speed in January:
4.1mph - Average wind speed in February:
4.2mph - Average wind speed in March:
4.3mph - Average wind speed in April:
4.2mph - Average wind speed in May:
3.9mph - Average wind speed in June:
4mph
- Average wind speed in July:
3.7mph - Average wind speed in August:
3.5mph - Average wind speed in September:
3.4mph - Average wind speed in October:
3.6mph - Average wind speed in November:
4mph - Average wind speed in December:
3.7mph
The windiest month (with the highest average wind speed) is March (4.3mph).
The calmest month (with the lowest average wind speed) is September (3.4mph).
Average humidity
Union, WA
The months with the highest relative humidity are November and December (90%).
The month with the lowest relative humidity is July (72%).
Average rainfall
Union, WA
- Average rainfall in January:
7.24" - Average rainfall in February:
3.9" - Average rainfall in March:
4.37" - Average rainfall in April:
2.87" - Average rainfall in May:
1.97" - Average rainfall in June:
1.3"
The wettest month (with the highest rainfall) is January (7.24").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days
Union, WA
- Average rainfall days in January:
18.8 days - Average rainfall days in February:
17.7 days - Average rainfall days in March:
21.4 days - Average rainfall days in April:
19.3 days - Average rainfall days in May:
14.3 days - Average rainfall days in June:
11.9 days
- Average rainfall days in July:
7.1 days - Average rainfall days in August:
6.3 days - Average rainfall days in September:
12.3 days - Average rainfall days in October:
16.6 days - Average rainfall days in November:
19.8 days - Average rainfall days in December:
19.9 days
The month with the highest number of rainy days is March (21.4 days).
The month with the least rainy days is August (6.3 days).
Average snowfall
Union, WA
The month with the highest snowfall is February (2.17").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Union, WA
- Average snowfall days in January:
1.9 days - Average snowfall days in February:
3.3 days - Average snowfall days in March:
1.5 days - Average snowfall days in April:
0.3 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:
0.5 days - Average snowfall days in December:
1.6 days
The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Union, WA
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 6min - Average daylight in June:
15h and 54min
- Average daylight in July:
15h and 30min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January:
3h and 42min - Average sunshine in February:
4h and 0min - Average sunshine in March:
5h and 30min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 54min - Average sunshine in June:
9h and 30min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 42min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 12min - Average sunshine in November:
4h and 0min - Average sunshine in December:
3h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).
Average sunshine days
Union, WA
- Average sunshine days in January:
9.9 days - Average sunshine days in February:
8.1 days - Average sunshine days in March:
7.5 days - Average sunshine days in April:
9.2 days - Average sunshine days in May:
14.3 days - Average sunshine days in June:
15.4 days
- Average sunshine days in July:
21.7 days - Average sunshine days in August:
21.6 days - Average sunshine days in September:
15.1 days - Average sunshine days in October:
12.5 days - Average sunshine days in November:
8.5 days - Average sunshine days in December:
9.4 days
The month with the most sunshine days is July (21.7 days).
The month with the least sunshine days is March (7.5 days).
Average UV index
Union, WA
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Union, WA
The months with the most cloud cover are January and December (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility
Union, WA
The months with the highest visibility are June, July, August and September (5mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (4mi).
