Updated October 2026
Harry S Truman National Historic Site Weather by Month
Harry S Truman National Historic Site is warmest in July, when the nearest NOAA climate station averages a high of 88°F and a low of 70°F, and coldest in January, with an average high of 39°F and an average low of 22°F. May is the wettest month, with about 5.7 inches of precipitation.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 8.1 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Harry S Truman National Historic Site can differ from these, particularly with elevation.
Warmest month
Jul
88°F avg high
Coldest month
Jan
22°F avg low
Wettest month
May
5.7 in avg
Longest days
Jun
14.7 h of daylight
Average weather at Harry S Truman by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 39°F | 22°F | 1.0 in | 9.6 h |
| February | 44°F | 26°F | 1.4 in | 10.5 h |
| March | 55°F | 35°F | 2.1 in | 11.7 h |
| April | 66°F | 46°F | 4.2 in | 13.0 h |
| May | 75°F | 56°F | 5.7 in | 14.1 h |
| June | 84°F | 65°F | 5.0 in | 14.7 h |
| July | 88°F | 70°F | 4.6 in | 14.5 h |
| August | 87°F | 68°F | 4.5 in | 13.5 h |
| September | 79°F | 59°F | 3.1 in | 12.2 h |
| October | 67°F | 47°F | 3.4 in | 11.0 h |
| November | 54°F | 36°F | 2.1 in | 9.8 h |
| December | 43°F | 26°F | 1.4 in | 9.3 h |
| Year total | 38.5 in |
NOAA 1991–2020 climate normals from station USW00053879, 8.1 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Harry S Truman is at that time of year.
Harry S Truman weather by season
Winter: December to February
Average highs bottom out at 39°F in January, between 43°F in December and 44°F in February, with average lows between 22°F and 26°F. The average low is at or below freezing in all three months. Together the three months average 3.8 inches of precipitation, about 10% of the yearly total and less than in any other season. Daylight is at its shortest, about 9.3 hours in December.
Spring: March to May
Average highs climb from 55°F in March to 75°F in May, with average lows between 35°F and 56°F. Together the three months average 12 inches of precipitation, about 31% of the yearly total. Daylight lengthens from about 11.7 hours in March to 14.1 in May.
Summer: June to August
Average highs peak at 88°F in July, between 84°F in June and 87°F in August, with average lows between 65°F and 70°F. Together the three months average 14.1 inches of precipitation, about 37% of the yearly total and more than in any other season. Daylight is at its longest, about 14.7 hours in June.
Fall: September to November
Average highs fall from 79°F in September to 54°F in November, with average lows between 36°F and 59°F. Together the three months average 8.6 inches of precipitation, about 22% of the yearly total. Daylight shortens from about 12.2 hours in September to 9.8 in November.
What the National Park Service says about the weather
Located on the western edge of Missouri, the park enjoys each of the four seasons. Early spring brings frequent and rapid fluctuations in weather. The summer season has warm days, periods of high heat and humidity, and mild nights. The fall season is normally mild with sunny days and cool nights. Winters can be cold. The January low averages 21 degrees. The area receives a yearly average of 37 inches of rain per year and around 18 inches of snow. Our zip code is 64050 if you wish to go to www.weather.gov
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Harry S Truman
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 38.93°N, 94.52°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Harry S Truman National Historic Site →
Weather and crowds together
July is both the warmest month and the busiest, with about 1.8× the visitors of the park's average month. January is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Harry S Truman National Historic Site. For hotels, cabins and rentals close to the park, see where to stay near Harry S Truman.
Where to stay near Harry S Truman
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Top-rated places to stay near Harry S Truman
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Frequently Asked Questions
July is the warmest month at Harry S Truman National Historic Site, with an average high of 88°F and an average low of 70°F. That is the 1991–2020 average at the nearest long-record NOAA station, 8.1 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Harry S Truman National Historic Site, with an average low of 22°F and an average high of 39°F, based on NOAA 1991–2020 climate normals.
May is the wettest month, with about 5.7 inches of precipitation. January is the driest, at about 1 inch. The station records about 38.5 inches of precipitation in an average year.
Daylight at Harry S Truman National Historic Site runs from about 9.3 hours a day in December to about 14.7 hours in June, computed from the park's latitude.
Weather at nearby parks
63 mi away · warmest in July (89°F)
76 mi away · warmest in July (91°F)
116 mi away · warmest in July (92°F)
134 mi away · warmest in August (90°F)
140 mi away · warmest in July (88°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USW00053879), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1984–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.