Warm
Average highs sit around 26°C, giving warm days by monthly-average standards.
Weather Guide
Groton, Connecticut, United States Average Monthly Weather
Weather score40Poor annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 15°C, sunshine averages 7.1h per day, and rainfall totals about 1221mm. Sea temperatures average 13°C across the year.
Annual weather
Annual averages
Temp
15°C
Rain
1221mm
Annual total
Sun
7.1h
Sea
13°C
Weather score
40
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 102mm, so some wet days are possible.
Bright
Sunshine averages 8.1h per day, so bright days are a strong part of the month.
Cool sea
Sea temperatures average 22°C, so the water can feel cool.
Map
Weather map
Compare Groton, Connecticut, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August26°C average high
August is one of Groton's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August102mm average rain
August sits near Groton's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August8.1 hours average sun
August is brighter than Groton's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsApril to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August22°C average sea
August is one of Groton's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 20°C in this stretch, so swimming comfort is at its strongest.
Weather score
August67 weather score
August is one of Groton's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
