Weather in Ostrobothnia

Calculated from weather data of Vaasa Airport (EFVA) between 2020 and 2024.

Maximum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	-2.3	-7.7	-1.9	-1.0	-4.7	2.9
February	-2.3	-3.3	0.2	-2.9	-5.5	1.9
March	1.3	1.9	-1.1	3.7	2.0	3.0
April	6.6	4.7	7.5	6.2	6.9	6.0
May	13.3		14.1	13.5	12.3	11.3
June	19.3		20.0	20.3	20.8	22.1
July	20.8		19.8	20.5	23.8	18.5
August	19.4		20.1	20.6	18.5	19.3
September	14.0		16.8	12.5	12.1	14.9
October	7.7		4.9	9.4	9.5	9.5
November	2.5		-2.9	2.3	2.0	6.0
December	-2.9		-5.5	-4.3	-4.0	1.7
Average	7.4	-1.4	8.1	9.0	8.1	9.7

10th highest temperature of Finland

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	-8.6	-14	-4	-8	-8	-2
February	-9.3	-8	-5	-9	-14	-5
March	-7.7	-4	-11	-4	-5	-3
April	-2.0	-2	-3	-3	-1	-1
May	3.0		4	4	3	1
June	9.2		9	10	10	10
July	11.1		11	11	13	10
August	10.5		12	11	10	10
September	6.4		9	5	5	7
October	1.7		-2	3	4	4
November	-2.2		-6	-1	-4	2
December	-6.2		-11	-9	-11	-1
Average	0.0	-7.0	0.3	1.2	0.2	2.6

19th lowest temperature of Finland

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days	2024	2023	2022	2021	2020
30 °C or warmer	0	0	1	1	1
25 °C or warmer	0	8	15	11	4
20 °C or warmer	0	48	37	49	36
0 °C or colder	87	177	152	159	134

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	31.7	25	29	29	39	24
February	30.2	21	22	27	37	23
March	21.3	13	26	15	21	15
April	15.0	26	9	11	17	13
May	9.6		8	9	13	7
June	7.7		6	5	4	4
July	8.8		14	9	3	16
August	9.9		17	11	13	4
September	12.7		12	12	13	11
October	18.5		12	11	25	26
November	23.2		46	15	20	20
December	33.3		43	40	33	30
Average	15.8	21.1	15.9	12.5	15.7	13.1

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (km/h)

Month	Average	2024	2023	2022	2021	2020
January	14.0	13	14	17	12	17
February	14.1	16	14	15	11	17
March	15.7	12	14	16	16	20
April	15.0	18	12	13	17	17
May	15.0		17	16	14	15
June	14.1		13	13	13	14
July	12.9		11	13	13	13
August	13.7		13	14	13	13
September	13.7		16	12	12	16
October	13.5		11	14	18	13
November	12.6		12	11	12	18
December	12.1		11	10	11	15
Average	14.1	15.0	13.2	13.8	13.8	15.3

8th highest wind speed of Finland

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2024	2023	2022	2021	2020
January	SW	S	W	E	SW
February	S	SW	SW	W	SW
March	S	NW	SW	W	SW
April	N	N	NW	NW	NW
May		SW	W	N	NW
June		NW	SW	W	W
July		NW	SW	W	SW
August		SE	SW	N	SW
September		SW	NE	W	SW
October		NW	SW	S	SE
November		NE	SE	SW	S
December		SE	SE	SW	SE

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.

Ostrobothnia weather Q&A

What is the warmest month in Ostrobothnia?

The warmest month is July with an average temperature of 21 °C over the past years.

What is the coldest month in Ostrobothnia?

The coldest month is January with an average daytime temperature of -2 °C in the past few years.

Which month is the wettest in Ostrobothnia?

Chance of precipitation is the highest in December with a probability of around 33.4 %.

Which month is the driest in Ostrobothnia?

The least rainfall and snow can be expected in June. The probability is about 7.7 %.