 The coastal terrain also features sandy-coquina spits.The climate of Opuksky is "Humid continental climate - Hot summer sub-type" (Köppen climate classification Dfa), with large seasonal temperature differentials and a hot summer (at least one month averaging over , and mild winters.. Average temperatures in the reserve range from in January to in July, and annual precipitation averages 270 mm.The reserve is located in the "Pontic–Caspian steppe" ecoregion, a region that covers an expanse of grasslands stretching from the northern shores of the Black Sea to western Kazakhstan.