Weather in Grantham in September

General weather information about Grantham

Average annual temperature is 10.0 °C

Absolute maximum temperature: 28.2 °C

Absolute minimum temperature: -6.0 °C

Number of sunny days: 175 days

Number of rainy days: 187 days

Number of snow days: 3 days

Look at detailed online map of Grantham

* Weather data for Grantham Canada is based on climate observations for 2026 year

Grantham air temperature forecast for each month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	9.1	9.6	13.4	17.5	26.0	26.1	28.2	27.5	23.9	17.0	13.6	10.2
Average daytime temperature (°C)	6.2	5.7	7.9	9.9	19.3	20.8	23.2	23.5	18.1	12.5	7.7	7.3
Average temperature (°C)	4.7	3.2	4.3	6.7	14.1	15.6	18.5	18.3	14.0	9.3	5.5	5.7
Average night temperature (°C)	3.2	1.3	1.4	4.2	9.9	11.5	14.3	14.4	10.8	6.9	3.4	3.9
Absolute minimum temperature (°C)	-2.5	-6.0	-2.2	0.0	4.9	7.7	11.5	10.3	6.4	-0.5	0.1	-1.4

Grantham monthly weather indicators

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daylight maximum duration (h)	9.0	10.0	12.0	14.0	15.0	16.0	16.0	15.0	13.0	11.0	9.0	8.0
Daylight mean duration (h)	8.7	10.1	11.9	13.8	15.4	16.2	15.8	14.4	12.6	10.8	9.1	8.2
Daylight minimum duration (h)	8.0	9.0	10.0	12.0	14.0	16.0	15.0	13.0	11.0	9.0	8.0	8.0
Sunshine mean duration (h)	2.2	3.7	7.5	6.8	12.4	12.4	13.2	11.3	9.1	6.2	4.2	2.4
Precipitation (mm)	252	106	92	217	21	9	21	39	94	197	190	294
Sunny days	5	4	9	9	25	23	25	24	17	17	14	3
Rainy days	26	21	22	21	6	7	6	7	13	14	16	28
Snow days	0	3	0	0	0	0	0	0	0	0	0	0

Grantham - weather forecast by months

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Best time to visit Grantham:

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

May — 12.4(h)
June — 12.4(h)
July — 13.2(h)
August — 11.3(h)

Months with the longest average daylight duration in Grantham:

May — 15.4(h)
June — 16.2(h)
July — 15.8(h)

The largest precipitation sum in Grantham is at

January — 252(mm)

April — 217(mm)

October — 197(mm)

November — 190(mm)

December — 294(mm)

Weather forecast in the closest to Grantham admin centers