Weathermondo.com
United StatesThe weather in May in Cornwall
It's pleasantly warm in May in Cornwall with an average temperature of 21°C. Temperatures this month range from a low of 16°C to a high of 27°C. At night, you can expect temperatures between 7°C and 15°C.
Looking for sun? May isn’t a good month to be in Cornwall. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in May for Cornwall, Connecticut. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 35°C in 2017, Cornwall reached the highest temperature in May over the past 10 years. The lowest daytime temperature in this month was 5°C in 2020. The extreme nighttime temperatures ranged from a lowest recorded value of -1°C to a highest value of 22°C.
Rainfall amount
In May, there is an average of 104 mm of precipitation, spread over 13 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in May for Cornwall
Click on any day in May to get detailed info about the usual weather on that day in Cornwall. Check out the historical temperatures and precipitation over the past 10 years on this day.
May weather comparison
| Cornwall | New York | |
|---|---|---|
| Average temperature | 21°C | 22°C |
| Max. temperature | 27°C | 28°C |
| Min. temperature | 7°C | -5°C |
| Total precipitation | 104 mm | 105 mm |
| Rainy days | 13 days | 14 days |
Start of May
The month of May starts in Cornwall with mild temps, averaging around 18°C during the day and nights around 9°C.
Mid May
By mid-May, daytime temps rise to around 23°C, with nights around 11°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of May
By the end of May, the average daytime temperature in Cornwall is around 24°C, while nighttime temps are about 13°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Cornwall for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in May in Cornwall, Connecticut. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in May in Cornwall
Temperature in May in Cornwall over the years
Precipitation charts
These charts show the average amount of precipitation in May in Cornwall, Connecticut. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in May in Cornwall
Total precipitation in May in Cornwall over the years
Daily UV index in May in Cornwall
This chart shows the average daily UV index in May in Cornwall, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in May in Cornwall
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Average weather in Cornwall by month
Click on a month below to see detailed weather info for Cornwall. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.