Weather in Cornwall in May

General weather information about Cornwall

Average annual temperature is 9.2 °C

Absolute maximum temperature: 33.1 °C

Absolute minimum temperature: -34.6 °C

Number of sunny days: 125 days

Number of rainy days: 207 days

Number of snow days: 33 days

Look at detailed online map of Cornwall

* Weather data for Cornwall United States is based on climate observations for 2026 year

Cornwall air temperature forecast for each month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	7.5	13.6	10.5	28.3	30.6	33.1	32.2	27.0	31.0	28.4	15.8	11.5
Average daytime temperature (°C)	2.0	2.6	5.0	15.7	19.8	23.8	27.4	24.1	22.6	16.8	6.7	4.7
Average temperature (°C)	-1.4	-3.5	0.1	9.0	13.2	18.1	22.0	19.2	17.3	12.4	2.4	1.1
Average night temperature (°C)	-4.5	-8.8	-4.3	3.9	7.2	13.6	18.0	15.5	13.2	9.1	-0.9	-1.6
Absolute minimum temperature (°C)	-13.2	-34.6	-12.6	-3.8	0.8	8.0	13.6	11.1	6.4	-0.2	-7.1	-7.4

Cornwall monthly weather indicators

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daylight maximum duration (h)	9.0	11.0	12.0	14.0	15.0	15.0	15.0	14.0	13.0	11.0	10.0	9.0
Daylight mean duration (h)	9.3	10.5	11.9	13.5	14.7	15.4	15.1	14.0	12.5	11.0	9.7	9.0
Daylight minimum duration (h)	8.0	9.0	11.0	12.0	14.0	15.0	14.0	13.0	11.0	10.0	9.0	8.0
Sunshine mean duration (h)	2.8	5.7	5.7	7.5	11.1	9.6	10.4	9.8	8.5	6.0	5.7	2.9
Precipitation (mm)	115	54	89	90	86	120	243	187	45	120	58	149
Sunny days	5	6	11	14	20	8	3	7	15	11	15	10
Rainy days	13	14	15	16	11	22	28	24	15	20	13	16
Snow days	13	8	5	0	0	0	0	0	0	0	2	5

Cornwall - weather forecast by months

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Best time to visit Cornwall:

The best time to visit Cornwall during the most sunny months:

May — 11.1(h)
June — 9.6(h)
July — 10.4(h)
August — 9.8(h)

Months with the longest average daylight duration in Cornwall:

June — 15.4(h)

The largest precipitation sum in Cornwall is at

July — 243(mm)

August — 187(mm)

December — 149(mm)

Weather forecast in the closest to Cornwall admin centers