Updated October 2026
Eugene O'Neill National Historic Site Weather by Month
Eugene O'Neill National Historic Site is warmest in August, when the nearest NOAA climate station averages a high of 83°F and a low of 61°F, and coldest in December, with an average high of 53°F and an average low of 41°F. January and December are the wettest months, with about 5.1 inches of precipitation each.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 6.4 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Eugene O'Neill National Historic Site can differ from these, particularly with elevation.
Warmest month
Aug
83°F avg high
Coldest month
Dec
41°F avg low
Longest days
Jun
14.6 h of daylight
Average weather at Eugene O'Neill by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 54°F | 42°F | 5.1 in | 9.7 h |
| February | 55°F | 42°F | 4.9 in | 10.6 h |
| March | 58°F | 43°F | 3.7 in | 11.7 h |
| April | 62°F | 44°F | 1.9 in | 13.0 h |
| May | 68°F | 49°F | 1.1 in | 14.0 h |
| June | 76°F | 55°F | 0.3 in | 14.6 h |
| July | 83°F | 62°F | 0.0 in | 14.4 h |
| August | 83°F | 61°F | 0.0 in | 13.5 h |
| September | 80°F | 60°F | 0.1 in | 12.2 h |
| October | 72°F | 54°F | 1.2 in | 11.0 h |
| November | 60°F | 46°F | 2.7 in | 9.9 h |
| December | 53°F | 41°F | 5.1 in | 9.4 h |
| Year total | 26.1 in |
NOAA 1991–2020 climate normals from station USC00045915, 6.4 miles from the park's reference point. Snowfall at the station totals about 0.7 inches in an average year. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Eugene O'Neill is at that time of year.
Eugene O'Neill weather by season
Winter: December to February
Average highs hold near 54°F in all three months, with average lows near 42°F. Together the three months average 15.1 inches of precipitation, about 58% of the yearly total and more than in any other season. Daylight is at its shortest, about 9.4 hours in December.
Spring: March to May
Average highs climb from 58°F in March to 68°F in May, with average lows between 43°F and 49°F. Together the three months average 6.7 inches of precipitation, about 26% of the yearly total. Daylight lengthens from about 11.7 hours in March to 14.0 in May.
Summer: June to August
Average highs climb from 76°F in June to 83°F in August, with average lows between 55°F and 62°F. Together the three months average 0.3 inches of precipitation, about 1% of the yearly total and less than in any other season. Daylight is at its longest, about 14.6 hours in June.
Fall: September to November
Average highs fall from 80°F in September to 60°F in November, with average lows between 46°F and 60°F. Together the three months average 4 inches of precipitation, about 15% 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
The Mediterranean climate of Danville features hot, dry summers with lower temperatures near 60º F and upper temperatures near 100º F. The heat gives way to cool, rainy winters with lows near 45º F and highs near 75º F. Fall and spring can bring rain and temperatures from 55-80º F.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Eugene O'Neill
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 37.83°N, 122.03°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 Eugene O'Neill National Historic Site →
Weather and crowds together
August, the warmest month, sees about 1.0× the visitors of the park's average month. May 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 Eugene O'Neill National Historic Site. For hotels, cabins and rentals close to the park, see where to stay near Eugene O'Neill.
Where to stay near Eugene O'Neill
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Top-rated places to stay near Eugene O'Neill
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Frequently Asked Questions
August is the warmest month at Eugene O'Neill National Historic Site, with an average high of 83°F and an average low of 61°F. That is the 1991–2020 average at the nearest long-record NOAA station, 6.4 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
December is the coldest month at Eugene O'Neill National Historic Site, with an average low of 41°F and an average high of 53°F, based on NOAA 1991–2020 climate normals.
January and December are the wettest months, with about 5.1 inches of precipitation each. July and August are the driest, each averaging close to zero. The station records about 26.1 inches of precipitation in an average year.
Rarely, by the station's record. The nearest long-record NOAA station, 6.4 miles from the park's reference point, totals about 0.7 inches of snow in an average year.
Weather at nearby parks
12 mi away · warmest in July (88°F)
19 mi away · warmest in September (75°F)
22 mi away · warmest in September (70°F)
24 mi away · warmest in September (70°F)
31 mi away · warmest in August (83°F)
31 mi away · warmest in August (83°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00045915), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1985–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.