Updated October 2026
Waco Mammoth National Monument Weather by Month
Waco Mammoth National Monument is warmest in August, when the nearest NOAA climate station averages a high of 95°F and a low of 75°F, and coldest in January, with an average high of 59°F and an average low of 36°F. May is the wettest month, with about 4.4 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, 2.4 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Waco Mammoth National Monument can differ from these, particularly with elevation.
Warmest month
Aug
95°F avg high
Coldest month
Jan
36°F avg low
Wettest month
May
4.4 in avg
Longest days
Jun
14.1 h of daylight
Average weather at Waco Mammoth by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 59°F | 36°F | 2.7 in | 10.2 h |
| February | 62°F | 40°F | 2.7 in | 10.9 h |
| March | 68°F | 48°F | 3.5 in | 11.8 h |
| April | 76°F | 54°F | 3.2 in | 12.8 h |
| May | 83°F | 64°F | 4.4 in | 13.6 h |
| June | 91°F | 72°F | 3.6 in | 14.1 h |
| July | 95°F | 75°F | 1.9 in | 13.9 h |
| August | 95°F | 75°F | 2.4 in | 13.2 h |
| September | 89°F | 68°F | 3.2 in | 12.2 h |
| October | 80°F | 57°F | 4.3 in | 11.2 h |
| November | 68°F | 46°F | 2.9 in | 10.4 h |
| December | 60°F | 39°F | 2.8 in | 9.9 h |
| Year total | 37.6 in |
NOAA 1991–2020 climate normals from station USC00419417, 2.4 miles from the park's reference point. The station's snowfall normal is zero in all twelve months. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Waco Mammoth is at that time of year.
Waco Mammoth weather by season
Winter: December to February
Average highs bottom out at 59°F in January, between 60°F in December and 62°F in February, with average lows between 36°F and 40°F. Together the three months average 8.2 inches of precipitation, about 22% of the yearly total. Daylight is at its shortest, about 9.9 hours in December.
Spring: March to May
Average highs climb from 68°F in March to 83°F in May, with average lows between 48°F and 64°F. Together the three months average 11.1 inches of precipitation, about 30% of the yearly total and more than in any other season. Daylight lengthens from about 11.8 hours in March to 13.6 in May.
Summer: June to August
Average highs climb from 91°F in June to 95°F in August, with average lows between 72°F and 75°F. The average high is 90°F or hotter in all three months. Together the three months average 7.9 inches of precipitation, about 21% of the yearly total and less than in any other season. Daylight is at its longest, about 14.1 hours in June.
Fall: September to November
Average highs fall from 89°F in September to 68°F in November, with average lows between 46°F and 68°F. Together the three months average 10.4 inches of precipitation, about 28% of the yearly total. Daylight shortens from about 12.2 hours in September to 10.4 in November.
What the National Park Service says about the weather
The monument enjoys a sunny, mild climate during three seasons of the year. Spring: Temperatures range from 45 F to 85 F (7 C/29 C). Rain is common in April and May. Summer: Temperatures range from 70 F to 95 F (21 C/35 C). Temperatures can exceed 100 F (38 C) in July and August. Lightweight clothing and sunscreen are advisable. Be prepared with plenty of water. Fall: Temperatures range from 45 F to 85 F (7 C/29 C). Winter: Temperatures range from 35 F to 65 F (2 C/18 C) . Snow and ice are rare.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Waco Mammoth
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 31.60°N, 97.18°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 Waco Mammoth National Monument →
Weather and crowds together
August, the warmest month, sees about 0.8× the visitors of the park's average month. March is the busiest month of the year and January the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Waco Mammoth National Monument. For hotels, cabins and rentals close to the park, see where to stay near Waco Mammoth.
Where to stay near Waco Mammoth
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Frequently Asked Questions
August is the warmest month at Waco Mammoth National Monument, with an average high of 95°F and an average low of 75°F. That is the 1991–2020 average at the nearest long-record NOAA station, 2.4 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Waco Mammoth National Monument, with an average low of 36°F and an average high of 59°F, based on NOAA 1991–2020 climate normals.
May is the wettest month, with about 4.4 inches of precipitation. July is the driest, at about 1.9 inches. The station records about 37.6 inches of precipitation in an average year.
The nearest long-record NOAA station, 2.4 miles from the park's reference point, shows no measurable snowfall in any month of its 1991–2020 normals.
Weather at nearby parks
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00419417), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (2015–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.