Cool
Average highs are around 19°C, so pack for cooler days.
May verdict
Groton, Connecticut, United States in May
Weather score40Poor
Poor for holiday weather
Average highs are around 19°C, so pack for cooler days. Sunshine averages 8.5h per day, so bright days are a strong part of the month. Rainfall averages 99mm, so some wet days are possible.
May weather
Monthly averages
Temp
19°C
Rain
99mm
Sun
8.5h
Sea
11°C
Weather score
40
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 99mm, so some wet days are possible.
Bright
Sunshine averages 8.5h per day, so bright days are a strong part of the month.
Cool sea
Sea temperatures average 11°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
May19°C average high
May is close to Groton's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
May99mm average rain
May 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
May8.5 hours average sun
May 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
May11°C average sea
May is close to Groton's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaJuly to September
Sea temperatures are usually near 20°C in this stretch, so swimming comfort is at its strongest.
Weather score
May40 weather score
May sits close to Groton's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
