Weather in Cornwall in August

General weather information about Cornwall

Average annual temperature is 9.4 °C

Absolute maximum temperature: 37.1 °C

Absolute minimum temperature: -13.9 °C

Number of sunny days: 179 days

Number of rainy days: 153 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)	8.6	8.2	12.1	25.4	28.9	30.4	34.7	37.1	29.0	23.9	12.3	7.8
Average daytime temperature (°C)	2.9	4.7	6.4	12.0	22.2	23.7	30.5	28.5	22.1	15.5	6.7	4.3
Average temperature (°C)	-0.8	-0.1	1.2	6.0	15.2	17.5	23.1	21.7	15.6	9.6	2.6	1.0
Average night temperature (°C)	-3.7	-3.4	-3.2	1.4	9.4	11.2	15.7	15.3	10.3	5.5	-0.5	-1.4
Absolute minimum temperature (°C)	-13.9	-12.9	-11.4	-5.2	3.2	3.7	10.7	9.0	5.5	-6.5	-7.9	-5.2

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	8.0
Daylight mean duration (h)	9.0	10.3	11.9	13.6	15.0	15.8	15.4	14.2	12.6	10.9	9.4	8.6
Daylight minimum duration (h)	8.0	9.0	11.0	12.0	14.0	15.0	14.0	13.0	11.0	10.0	8.0	8.0
Sunshine mean duration (h)	4.3	5.8	7.4	9.2	12.5	13.4	14.1	10.9	9.2	7.8	5.2	4.3
Precipitation (mm)	43	50	64	76	66	28	0	54	32	36	77	86
Sunny days	10	12	8	7	16	17	30	19	16	18	15	11
Rainy days	14	10	9	20	15	13	1	12	14	12	15	18
Snow days	7	6	14	3	0	0	0	0	0	1	0	2

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 — 12.5(h)
June — 13.4(h)
July — 14.1(h)
August — 10.9(h)

Months with the longest average daylight duration in Cornwall:

June — 15.8(h)
July — 15.4(h)

The largest precipitation sum in Cornwall is at

April — 76(mm)

May — 66(mm)

November — 77(mm)

December — 86(mm)

Weather forecast in the closest to Cornwall admin centers