The best times to visit Union for ideal weather are

April 16th to June 17th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Union Travel Info

Weather in Union


Average temperatures in Union vary drastically. Considering humidity, temperatures feel nice between summer and winter. The temperatures feel cold for about half the year, and too hot for part of the year with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 26th 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, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 91.2°F (32.9°C) with temperatures rarely dropping below 68.5°F (20.3°C) at night.

Union Temperatures (Fahrenheit)


Union Temperatures (Celsius)


“Feels-Like” Temperatures

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 Perceived Temperature (F)


Union Perceived Temperature (C)



Average Union 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.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 42.2 30.6 20.8
Feb 44.2 32.6 23.1
Mar 60.2 47 36.1
Apr 70.1 57 45.1
May 78.6 66.6 55.3
Jun 87.1 75.7 65
Jul 90.1 78.3 67.5
Aug 89.3 76.8 65.6
Sep 81.6 68.3 57
Oct 70.2 56.8 45.2
Nov 58 45.7 35
Dec 45.9 35.8 27.1

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 5.7 -0.8 -6.2
Feb 6.8 0.3 -4.9
Mar 15.7 8.3 2.3
Apr 21.2 13.9 7.3
May 25.9 19.2 12.9
Jun 30.6 24.3 18.3
Jul 32.3 25.7 19.7
Aug 31.8 24.9 18.7
Sep 27.6 20.2 13.9
Oct 21.2 13.8 7.3
Nov 14.4 7.6 1.7
Dec 7.7 2.1 -2.7



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Union are January, July, and then August. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid January. For example, on the week of January 15th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late April with an average of 3 days of significant precipitation the week of April 23rd.

When can you find snow in Union? Weather stations report a good amount of seasonal snow likely to be deepest around November, especially close to mid November. The best time to ski (if at all) in Union is often around around November 12th 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.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Union (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 10% 0 1.5
Feb 17% 0 2.1
Mar 23% 0 3.5
Apr 27% 0 5.2
May 29% 0 4.5
Jun 28% 0 5
Jul 15% 0 2.9
Aug 15% 0 3
Sep 17% 0 3.6
Oct 18% 0 2.9
Nov 16% 11.8 2.6
Dec 21% 0 3.5

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 10 0 3.8
Feb 17 0 5.3
Mar 23 0 8.9
Apr 27 0 13.2
May 29 0 11.4
Jun 28 0 12.7
Jul 15 0 7.4
Aug 15 0 7.6
Sep 17 0 9.1
Oct 18 0 7.4
Nov 16 30 6.6
Dec 21 0 8.9


Humidity and Wind

Union has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is April (49.8% relative humidity), and the most humid month is September (64.2%).

Wind in Union is usually calm. The windiest month is February, followed by April and January. February’s average wind speed of around 6.6 knots (7.6 MPH or 12.2 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 April where average top sustained speeds reach 14.5 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Union.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

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 6.4 Light breeze 13 Significant breeze
Feb 6.6 Light breeze 13.5 Significant breeze
Mar 6.4 Light breeze 13.2 Significant breeze
Apr 6.6 Light breeze 14.2 Significant breeze
May 4.9 Light breeze 12.3 Significant breeze
Jun 4.6 Light breeze 12.3 Significant breeze
Jul 3.8 Barely noticeable 10.2 Significant breeze
Aug 3.3 Barely noticeable 10.1 Gentle breeze
Sep 3.4 Barely noticeable 9.7 Significant breeze
Oct 4.7 Light breeze 11.3 Significant breeze
Nov 5.4 Light breeze 11.8 Significant breeze
Dec 5.7 Light breeze 12.2 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 54.1%
Feb 52.9%
Mar 51.5%
Apr 49.8%
May 58.9%
Jun 61.9%
Jul 61%
Aug 62.3%
Sep 64.2%
Oct 58.4%
Nov 54.6%
Dec 63.4%


Is it Safe to Travel to Union?

Our best data indicates this area is generally safe. As of Dec 04, 2023 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 Dec 04, 2023.


The Busiest and Least Crowded Months

The busiest month for tourism in Union, MO, US is March, followed by May and February. 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 in November. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 44 in November means 44% of the tourists vs. March.



Overall Union Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderate. Highs range from 83.5°F (28.6°C) and 48.5°F (9.2°C) with warmer temperatures in the later months. Rain is somewhat common with 7 to 9 days of significant precipitation per month. Spring is the 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 moderate precipitation with 5 to 8 days of precipitation per month. June – August is the second busiest season for tourism in Union, so lodging and other accommodations may cost slightly more.

Fall (September through November)

Fall daily highs range from 84.5°F (29.2°C) and 51.8°F (11°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: approximately 5 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 to be enjoyable for warm weather travelers. The average high during this season is between 48.5°F (9.2°C) and 41.5°F (5.3°C). On average, it rains or snows a fair amount: 3 to 7 times per month. These times of year are fairly slow with tourists.


Best Times to Travelthe United States › Union, MO, US