The best time to visit Channel Islands is generally April, May, June, July, August, September and October. It is a national park in California.
April, May, June, July, August, September and October tend to bring the best balance of weather, access and conditions. Around then, daytime highs average about 68°F and overnight lows near 59°F.
In general, the islands have a Mediterranean climate year-round. Temperatures are relatively stable, with highs averaging in the mid-60s (°F) and lows in the low-50s. However, there are seasonal differences that visitors should take into consideration when visiting the park. In addition, visitors also should be aware that ocean and weather conditions vary considerably from day-to-day and island-to-island. For more information visit: http://www.nps.gov/chis/planyourvisit/weather.htm
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