Weather in Koski in September

General weather information about Koski

Average annual temperature is 4.5 °C

Absolute maximum temperature: 29.1 °C

Absolute minimum temperature: -18.4 °C

Number of sunny days: 135 days

Number of rainy days: 169 days

Number of snow days: 61 days

Look at detailed online map of Koski

* Weather data for Koski Finland is based on climate observations for 2026 year

Koski air temperature forecast for each month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	3.4	5.4	5.1	16.3	22.2	28.2	24.9	29.1	22.7	12.1	5.0	4.0
Average daytime temperature (°C)	-1.3	-0.8	-0.8	7.9	14.7	20.7	19.8	20.1	16.9	4.4	-1.3	-4.4
Average temperature (°C)	-3.1	-3.4	-4.5	1.8	9.6	15.7	15.9	16.4	13.3	1.4	-3.2	-6.4
Average night temperature (°C)	-5.1	-6.4	-8.9	-3.6	3.6	9.5	11.7	12.6	9.8	-1.4	-5.4	-8.8
Absolute minimum temperature (°C)	-18.4	-13.7	-15.8	-15.8	-3.9	1.0	9.8	8.3	2.3	-9.5	-16.6	-18.0

Koski monthly weather indicators

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daylight maximum duration (h)	7.0	10.0	13.0	16.0	19.0	20.0	20.0	17.0	14.0	11.0	8.0	5.0
Daylight mean duration (h)	5.9	8.7	11.8	15.0	18.1	20.1	19.1	16.1	13.0	9.9	6.8	4.9
Daylight minimum duration (h)	4.0	7.0	10.0	13.0	16.0	19.0	17.0	14.0	11.0	8.0	5.0	4.0
Sunshine mean duration (h)	1.0	3.0	5.1	9.8	12.0	14.4	10.7	9.3	5.8	4.7	0.5	0.5
Precipitation (mm)	64	24	46	56	57	26	136	155	123	80	51	36
Sunny days	11	13	8	22	14	14	4	8	5	13	12	11
Rainy days	10	5	8	8	17	16	27	23	25	15	9	6
Snow days	10	10	15	0	0	0	0	0	0	3	9	14

Koski - weather forecast by months

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Best time to visit Koski:

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

April — 9.8(h)
May — 12.0(h)
June — 14.4(h)
July — 10.7(h)
August — 9.3(h)

Months with the longest average daylight duration in Koski:

May — 18.1(h)
June — 20.1(h)
July — 19.1(h)
August — 16.1(h)

The largest precipitation sum in Koski is at

July — 136(mm)

August — 155(mm)

September — 123(mm)

Weather forecast in the closest to Koski admin centers