Groton Weather in September

Thinking of visiting Groton in September? Expect high temperatures reaching 23°C (73°F) during the day, dropping to 14°C (57°F) at night, and note that quite a bit of rainfall is likely.

Rainfall in Groton in September

Historically, approximately 10 days this month are expected to have rain, averaging 104 mm (4.1 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Groton in September

September in Groton sees highs of 23°C (73°F) and lows of 14°C (57°F) overnight. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Groton in September

Enjoy a sunny month with about 223 hours of sunshine, the clear skies make Groton even more beautiful.

Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.