Updated October 2026
Ulysses S Grant National Historic Site Weather by Month
Ulysses S Grant National Historic Site is warmest in July, when the nearest NOAA climate station averages a high of 90°F and a low of 72°F, and coldest in January, with an average high of 41°F and an average low of 25°F. May is the wettest month, with about 4.9 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, 7 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Ulysses S Grant National Historic Site can differ from these, particularly with elevation.
Warmest month
Jul
90°F avg high
Coldest month
Jan
25°F avg low
Wettest month
May
4.9 in avg
Longest days
Jun
14.7 h of daylight
Average weather at Ulysses S Grant by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 41°F | 25°F | 2.7 in | 9.6 h |
| February | 46°F | 28°F | 2.3 in | 10.6 h |
| March | 56°F | 38°F | 3.6 in | 11.7 h |
| April | 68°F | 48°F | 4.8 in | 13.0 h |
| May | 77°F | 59°F | 4.9 in | 14.1 h |
| June | 86°F | 67°F | 4.7 in | 14.7 h |
| July | 90°F | 72°F | 4.2 in | 14.4 h |
| August | 89°F | 70°F | 3.8 in | 13.5 h |
| September | 82°F | 62°F | 3.4 in | 12.2 h |
| October | 70°F | 50°F | 3.2 in | 11.0 h |
| November | 56°F | 39°F | 3.7 in | 9.9 h |
| December | 45°F | 30°F | 2.6 in | 9.3 h |
| Year total | 43.9 in |
NOAA 1991–2020 climate normals from station USC00237452, 7 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Ulysses S Grant is at that time of year.
Ulysses S Grant weather by season
Winter: December to February
Average highs bottom out at 41°F in January, between 45°F in December and 46°F in February, with average lows between 25°F and 30°F. The average low is at or below freezing in all three months. Together the three months average 7.6 inches of precipitation, about 17% 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 56°F in March to 77°F in May, with average lows between 38°F and 59°F. Together the three months average 13.3 inches of precipitation, about 30% of the yearly total and more than in any other season. Daylight lengthens from about 11.7 hours in March to 14.1 in May.
Summer: June to August
Average highs peak at 90°F in July, between 86°F in June and 89°F in August, with average lows between 67°F and 72°F. The average high is 90°F or hotter in July. Together the three months average 12.7 inches of precipitation, about 29% of the yearly total. Daylight is at its longest, about 14.7 hours in June.
Fall: September to November
Average highs fall from 82°F in September to 56°F in November, with average lows between 39°F and 62°F. Together the three months average 10.3 inches of precipitation, about 23% of the yearly total. Daylight shortens from about 12.2 hours in September to 9.9 in November.
What the National Park Service says about the weather
St. Louis weather can be uncomfortable and occasionally severe, so please plan your visit accordingly. High heat and humidity, severe thunderstorms, snow and ice, and extreme cold are all possible depending upon the season. For an update of inclement weather conditions which may affect your visit, call (314)842-1867 and follow the instructions to connect to the inclement weather report.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Ulysses S Grant
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 38.55°N, 90.35°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 Ulysses S Grant 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 Ulysses S Grant National Historic Site. For hotels, cabins and rentals close to the park, see where to stay near Ulysses S Grant.
Where to stay near Ulysses S Grant
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Frequently Asked Questions
July is the warmest month at Ulysses S Grant National Historic Site, with an average high of 90°F and an average low of 72°F. That is the 1991–2020 average at the nearest long-record NOAA station, 7 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Ulysses S Grant National Historic Site, with an average low of 25°F and an average high of 41°F, based on NOAA 1991–2020 climate normals.
May is the wettest month, with about 4.9 inches of precipitation. February is the driest, at about 2.3 inches. The station records about 43.9 inches of precipitation in an average year.
Daylight at Ulysses S Grant 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
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109 mi away · warmest in July (92°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00237452), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1991–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.