Updated October 2026
Castlewood State Park: Weather by Month and When to Go
Castlewood State Park is a state park in Missouri. Average highs range from 40°F in January to 89°F in July.
Average highs sit between 60°F and 80°F in April through May and October. They run above 80°F in June through September and below 60°F in November through March. The figures are NOAA climate normals for 1991–2020, measured at a weather station 9.6 miles from the park.
Warmest average high
89°F
July
Coldest average low
22°F
January
Most precipitation
5.2 in
May
Longest days
14.7 h
June
Castlewood State Park weather by month
| Month | Average high | Average low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 40°F | 22°F | 2.6 in | 4.2 in | 9.6 h |
| February | 46°F | 25°F | 2.2 in | 1.1 in | 10.6 h |
| March | 56°F | 35°F | 3.6 in | 0.3 in | 11.7 h |
| April | 67°F | 46°F | 4.6 in | 0.0 in | 13.0 h |
| May | 77°F | 56°F | 5.2 in | 0.0 in | 14.1 h |
| June | 85°F | 65°F | 4.3 in | 0.0 in | 14.7 h |
| July | 89°F | 69°F | 3.9 in | 0.0 in | 14.4 h |
| August | 88°F | 67°F | 3.5 in | 0.0 in | 13.5 h |
| September | 81°F | 58°F | 3.3 in | 0.0 in | 12.2 h |
| October | 70°F | 46°F | 3.2 in | 0.0 in | 11.0 h |
| November | 56°F | 36°F | 3.5 in | 0.4 in | 9.9 h |
| December | 45°F | 27°F | 2.5 in | 2.1 in | 9.3 h |
Temperature, precipitation and snowfall figures are NOAA climate normals for 1991–2020 from station USC00237398, the nearest station with a complete set of temperature normals, 9.6 miles from the park. Conditions in the park can differ from the station's, most of all where the two sit at different elevations. Daylight is calculated for the park's latitude at the middle of each month.
What the averages show
- Temperature. July is the warmest month, with an average high of 89°F and an average low of 69°F. January is the coldest month, with an average low of 22°F and an average high of 40°F.
- Precipitation. May is the wettest month, averaging 5.2 inches of precipitation, and February is the driest, at 2.2 inches. An average year brings about 42.4 inches in total.
- Snowfall. The station averages 8.1 inches of snow a year, with the most in January (4.2 inches).
- Daylight. Days run from about 9.3 hours of daylight in December to 14.7 hours in June.
Camping, trails, maps and fees
Whether Castlewood State Park has camping or cabins, where its trails run, when it opens and what it charges are all published by the agency that runs the park. Its official page is the place to check before a trip.
Official Castlewood State Park page
For the forecast rather than the averages, the National Weather Service issues a point forecast for the park's location.
Where to stay near Castlewood State Park
Hotels, cabins and vacation rentals near Castlewood State Park, with live availability and prices.
Top-rated places to stay near Castlewood State Park
Prices for Oct 16–18, 4 adults. Change dates on the map below.
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Frequently Asked Questions
July is the warmest month, with an average high of 89°F and an average low of 69°F. January is the coldest month, with an average low of 22°F and an average high of 40°F. These are NOAA 1991–2020 climate normals from a weather station 9.6 miles from the park.
Average highs sit between 60°F and 80°F in April through May and October. They run above 80°F in June through September and below 60°F in November through March.
May is the wettest month, averaging 5.2 inches of precipitation, and February is the driest, at 2.2 inches. An average year brings about 42.4 inches in total. Snowfall averages 8.1 inches a year, with the most in January.
Days run from about 9.3 hours of daylight in December to 14.7 hours in June. The hours are calculated for the park's latitude.
Nearest National Park Service sites
- Ulysses S Grant National Historic Site10 miles away
- Gateway Arch National Park20 miles away
- Ste. Geneviève National Historical Park48 miles away
Nearby state parks
- Pere Marquette State Park30 miles away · Illinois
- Elephant Rocks State Park62 miles away
Distances are measured in a straight line from the park, so the drive is longer.
Sources: NOAA NCEI U.S. Climate Normals 1991–2020; USGS Protected Areas Database for location; the official Missouri state park listing for the park's name.