The best times to visit Union Gap for ideal weather are
April 30th to October 7th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Union Gap Travel Guide
Other Union Gap Travel Info
Weather in Union Gap
Average temperatures in Union Gap vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 45th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Union Gap, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally early August where highs are regularly around 94.8°F (34.9°C) with temperatures rarely dropping below 55.4°F (13°C) at night.
Union Gap Temperatures (Fahrenheit)
Union Gap Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Union Gap Perceived Temperature (F)
Union Gap Perceived Temperature (C)
Average Union Gap Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Union Gap are July, August, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early July. For example, on the week of July 2nd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid December with an average of 1 days of significant precipitation the week of December 17th.
When can you find snow in Union Gap? Weather stations report large amounts of snow likely to be deepest around December, especially close to late January. The best time to ski (if at all) in Union Gap is often around around December 17th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Union Gap.
Snow on the Ground
The graph below shows the average snow on the ground in Union Gap (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Union Gap has some very humid months, and dry months in the opposite season. The least humid month is July (26.2% relative humidity), and the most humid month is December (70%).
Wind in Union Gap is usually calm. The windiest month is June, followed by April and May. June’s average wind speed of around 6.2 knots (7.2 MPH or 11.5 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid April where average top sustained speeds reach 16.2 knots, which is considered a moderate breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Union Gap.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||3.1||Barely noticeable||9.1||Gentle breeze|
|Feb||4||Light breeze||11||Significant breeze|
|Mar||5.3||Light breeze||14.1||Gentle breeze|
|Apr||6.1||Light breeze||15.4||Significant breeze|
|May||5.9||Light breeze||14.3||Gentle breeze|
|Jun||6.2||Light breeze||14.7||Significant breeze|
|Jul||5.7||Light breeze||12.8||Gentle breeze|
|Aug||5.3||Light breeze||12.4||Significant breeze|
|Sep||4.9||Light breeze||11.7||Gentle breeze|
|Oct||4.2||Light breeze||10.8||Gentle breeze|
|Nov||3.8||Barely noticeable||10.4||Gentle breeze|
|Dec||3.1||Barely noticeable||8.8||Gentle breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Union Gap?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Union Gap, WA, US is August, followed by July and June. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Union Gap in October. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Union Gap Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 80.1°F (26.7°C) and 52.9°F (11.6°C) with warmer temperatures in the later months. Rain is rare with 2 to 3 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the least precipitation with 0 to 2 days of precipitation per month. June – August is the busiest season for tourism in Union Gap, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 86.6°F (30.3°C) and 44.4°F (6.9°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 1 to 2 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.
Winter (December through February)
Weather is far too cold this time of year in Union Gap to be enjoyable for warm weather travelers. The average high during this season is between 54°F (12.2°C) and 39.2°F (4°C). On average, it rains or snows a smalll amount: 2 to 5 times per month. These times of year are fairly slow with tourists.