The best times to visit Umatilla 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.

 

 


Other Umatilla Travel Info

Weather in Umatilla

Temperature

Average temperatures in Umatilla 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 43rd 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 Umatilla, 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 95.8°F (35.4°C) with temperatures rarely dropping below 57.9°F (14.4°C) at night.

Umatilla Temperatures (Fahrenheit)

Key
High
Average
Low

Umatilla Temperatures (Celsius)

Key
High
Average
Low

“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.

Umatilla Perceived Temperature (F)

Key
High
Average
Low

Umatilla Perceived Temperature (C)

Key
High
Average
Low

 

Average Umatilla 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 42.9 34.4 27.3
Feb 50.1 38.7 29.2
Mar 59.8 45.6 32.8
Apr 66 51.1 36.9
May 76.6 60.2 44.4
Jun 83.6 67.6 51.9
Jul 94.2 76.1 57.5
Aug 92 73.9 56
Sep 82.5 64.2 47.2
Oct 66.9 52 39.1
Nov 51.1 40.4 30.8
Dec 41.8 33.2 25.4

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 6.1 1.3 -2.6
Feb 10.1 3.7 -1.6
Mar 15.4 7.6 0.4
Apr 18.9 10.6 2.7
May 24.8 15.7 6.9
Jun 28.7 19.8 11.1
Jul 34.6 24.5 14.2
Aug 33.3 23.3 13.3
Sep 28.1 17.9 8.4
Oct 19.4 11.1 3.9
Nov 10.6 4.7 -0.7
Dec 5.4 0.7 -3.7

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Umatilla 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 late March with an average of 1 days of significant precipitation the week of March 26th.

When can you find snow in Umatilla? Weather stations report no annual snow. 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 Umatilla.

Key
Days with precipitation

Snow on the Ground

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

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 11% 0 0.9
Feb 9% 0 0.6
Mar 10% 0 0.9
Apr 9% 0 0.7
May 10% 0 0.9
Jun 10% 0 0.8
Jul 1% 0 0.1
Aug 2% 0 0.2
Sep 4% 0 0.4
Oct 10% 0 0.9
Nov 10% 0 0.9
Dec 14% 0 1.2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 11 0 2.3
Feb 9 0 1.5
Mar 10 0 2.3
Apr 9 0 1.8
May 10 0 2.3
Jun 10 0 2
Jul 1 0 0.3
Aug 2 0 0.5
Sep 4 0 1
Oct 10 0 2.3
Nov 10 0 2.3
Dec 14 0 3

 

Humidity and Wind

Umatilla has some very humid months, and dry months in the opposite season. The least humid month is July (26.4% relative humidity), and the most humid month is December (73.3%).

Wind in Umatilla is usually calm. The windiest month is April, followed by June and May. April’s average wind speed of around 7.8 knots (9 MPH or 14.5 KPH) is considered “a gentle 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 16.4 knots, which is considered a moderate breeze.

Relative Humidity (%)

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

Key
Avg. Relative Humidity

Wind

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

Key
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 4.7 Light breeze 10.8 Gentle breeze
Feb 5.4 Light breeze 12.1 Significant breeze
Mar 6.7 Light breeze 14.6 Gentle breeze
Apr 7.8 Gentle breeze 15.7 Significant breeze
May 7.1 Gentle breeze 14 Gentle breeze
Jun 7.7 Gentle breeze 14.4 Significant breeze
Jul 6.5 Light breeze 12.6 Gentle breeze
Aug 6.3 Light breeze 12.4 Significant breeze
Sep 5.2 Light breeze 11.1 Gentle breeze
Oct 4.6 Light breeze 10.5 Gentle breeze
Nov 4.9 Light breeze 11.2 Gentle breeze
Dec 4.5 Light breeze 10.9 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 72.2%
Feb 66.3%
Mar 52.2%
Apr 42.3%
May 38.3%
Jun 35.3%
Jul 26.4%
Aug 29.8%
Sep 38.3%
Oct 55.7%
Nov 68.4%
Dec 73.3%

 

Is it Safe to Travel to Umatilla?

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 Umatilla, OR, US is July, followed by August and May. 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 Umatilla in September. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
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 36.1 in September means 36.1% of the tourists vs. July.

 

 

Overall Umatilla Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 81.6°F (27.6°C) and 53.5°F (11.9°C) with warmer temperatures in the later months. Rain is rare with roughly 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 3 days of precipitation per month. June – August is the busiest season for tourism in Umatilla, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 86.2°F (30.1°C) and 42.8°F (6°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 1 to 3 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 Umatilla to be enjoyable for warm weather travelers. The average high during this season is between 54.5°F (12.5°C) and 39.9°F (4.4°C). On average, it rains or snows a smalll amount: 2 to 4 times per month. These times of year are fairly slow with tourists.

 

Best Times to Travelthe United States › Umatilla, OR, US