The best times to visit De Smet for ideal weather are

May 14th to September 30th

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



Other De Smet Travel Info

Weather in De Smet


Average temperatures in De Smet vary an incredible amount. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a low chance of precipitation most of the year. The area is less temperate than some — in the 36th 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 De Smet, 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 89.4°F (31.9°C) with temperatures rarely dropping below 63.2°F (17.3°C) at night.

De Smet Temperatures (Fahrenheit)


De Smet 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.

De Smet Perceived Temperature (F)


De Smet Perceived Temperature (C)



Average De Smet 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 27.8 15.7 4.9
Feb 30.5 17.2 6.7
Mar 47.7 33.4 21.9
Apr 60.9 45.9 32.3
May 72.9 58.2 45
Jun 81.4 68.2 54.8
Jul 88.1 74.5 61
Aug 85.3 71.3 58.1
Sep 79.4 63.1 49.2
Oct 64.1 48.6 36.1
Nov 48.7 33.8 21.7
Dec 30.5 18.8 8.4

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan -2.3 -9.1 -15.1
Feb -0.8 -8.2 -14.1
Mar 8.7 0.8 -5.6
Apr 16.1 7.7 0.2
May 22.7 14.6 7.2
Jun 27.4 20.1 12.7
Jul 31.2 23.6 16.1
Aug 29.6 21.8 14.5
Sep 26.3 17.3 9.6
Oct 17.8 9.2 2.3
Nov 9.3 1 -5.7
Dec -0.8 -7.3 -13.1



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in De Smet are November, January, and then February. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early April. For example, on the week of April 2nd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late May to early June with an average of 3 days of significant precipitation the week of May 28th.

When can you find snow in De Smet? Weather stations report large amounts of snow likely to be deepest around February, especially close to mid February. The best time to ski (if at all) in De Smet is often around around April 9th 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 De Smet.

Days with precipitation

Snow on the Ground

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

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 5% 6.1 0.5
Feb 9% 6.2 0.9
Mar 10% 6 1.1
Apr 17% 3.6 2.3
May 22% 0 3.6
Jun 27% 0 5
Jul 17% 0 3
Aug 15% 0 3.1
Sep 12% 0 1.8
Oct 15% 1.2 2.6
Nov 4% 2.8 0.4
Dec 9% 4 1.3

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 5 15.5 1.3
Feb 9 15.7 2.3
Mar 10 15.2 2.8
Apr 17 9.1 5.8
May 22 0 9.1
Jun 27 0 12.7
Jul 17 0 7.6
Aug 15 0 7.9
Sep 12 0 4.6
Oct 15 3 6.6
Nov 4 7.1 1
Dec 9 10.2 3.3


Humidity and Wind

De Smet has some high humidity months, with other comfortably humid months. The least humid month is April (51.7% relative humidity), and the most humid month is December (69.4%).

Wind in De Smet is usually moderate. The windiest month is April, followed by March and May. April’s average wind speed of around 10.5 knots (12.1 MPH or 19.4 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 May where average top sustained speeds reach 19.4 knots, which is considered a fresh breeze.

Relative Humidity (%)

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

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 9.3 Gentle breeze 17.4 Strong breeze
Feb 9.1 Gentle breeze 16.2 Significant breeze
Mar 9.7 Gentle breeze 17.1 Strong breeze
Apr 10.5 Gentle breeze 18.3 Strong breeze
May 9.5 Gentle breeze 18 Strong breeze
Jun 7.8 Gentle breeze 16.1 Significant breeze
Jul 7.1 Gentle breeze 14.5 Strong breeze
Aug 6.8 Light breeze 13.7 Significant breeze
Sep 7.8 Gentle breeze 14.6 Strong breeze
Oct 8.8 Gentle breeze 15.8 Significant breeze
Nov 8.9 Gentle breeze 16.3 Strong breeze
Dec 8.6 Gentle breeze 15.5 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 66.6%
Feb 65.1%
Mar 62.1%
Apr 51.7%
May 54.2%
Jun 60.1%
Jul 59%
Aug 62.7%
Sep 56.5%
Oct 56.4%
Nov 58.9%
Dec 69.4%


Is it Safe to Travel to De Smet?

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 De Smet, SD, US is June, 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 De Smet 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 48.4 in November means 48.4% of the tourists vs. June.



Overall De Smet Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 77.1°F (25.1°C) and 28.6°F (-1.9°C) with far warmer temperatures in the later months. Rain is somewhat common with 3 to 7 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 most precipitation with 5 to 8 days of precipitation per month. June – August is the busiest season for tourism in De Smet, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 81.4°F (27.4°C) and 39.4°F (4.1°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 1 to 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 De Smet to be enjoyable for warm weather travelers. The average high during this season is between 33°F (0.6°C) and 26.1°F (-3.3°C). On average, it rains or snows a smalll amount: 1 to 3 times per month. These times of year are fairly slow with tourists.


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