According to scientific standards, Grovetown has a humid subtropical climate, moderate year-round with an average annual temperature of 64°F. Summer weather in Grovetown is generally very warm and sunny, and the winters are pleasingly mild.

Summers typically consist of long spells of warm and humid weather. Average afternoon high temperatures are in the lower 90s Readings of 90 or higher can be expected on 70 to 80 days. Overnight lows usually range from the upper 60s to lower 70s.

Temperatures during winter months are more variable. Oftentimes, stretches of mild weather will alternate with cold spells. Winter high temperatures average in the mid 50s to lower 60s. Lows average in the mid 30s. Lows of 32 degrees or lower can be expected on 40 to 50 days.

Spring & Autumn
Spring can be a short season in Grovetown, with pleasant weather and temperatures while it lasts. Autumn is a dry season and the month of October is usually the driest month of the year, with temperatures reaching daily highs of 77°F, which can drop at night-time to 50°F.

Spring and Autumn seasons are characterized by much variability from day to day and from year to year. The average date of 1st freeze is in mid-November. The average date of the last freeze in the spring is in mid to late March.

A measurable amount of rain falls on about 120 days each year, producing amounts averaging between 45 and 50 inches. As for snowfall, the average annual total is less than 1 inch.

Averaging over many years, the driest months are September and October and the wettest month is March. Thunderstorms are common in the spring and summer months. On a typical year, thunder will be heard on 50 to 60 days.