HelsinkiFinland · Europe · September

September climate

CityCulture

September in Helsinki

Finland · Europe

Cool days.

Good overall

Daytime high

60°F

Lows around 47°F

Rain

Several rainy days

Sun

4.5 h/day

Air feel

Very dry

When to visit

Month-by-month fit

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Temperature

Cool by day, brisk at night.

60°Ftypical September high

Typical range

Precipitation

Several rainy days. About 10 wet days, fewer than in most months.

33%wet-day frequency

Precip amountWet-day chanceSnowfall

Sunshine

Sunshine is limited, with cloud often dominating.

4.5 hSeptember sunshine

Heat & humidity by month

Very drySeptember Heat feel

Easy airWarm airHumid air

Hourly temperature pattern

In September, afternoons feel about 54° and nights feel near 45°.

FrigidFreezingVery coldColdCoolComfortableNight hours

Clear sky

Mostly cloudy skies this month.

33%September Clear sky

Clear skyCloud

Wind pattern

Calm winds are typical in September.

9 mphSeptember Light breeze

More detailIncludes daypart comfort

Typical September day

September late afternoons are around 59°F, easing to about 56°F in early evening.

Avg temp Typical range

Morning53°F

Rain16%

Cloud71%

Humid airLow

Sun intensityMinimal

Midday58°F

Rain22%

Cloud72%

Humid airLow

Sun intensityModerate

Late afternoon59°F

Rain21%

Cloud69%

Humid airLow

Sun intensityLow

Early evening56°F

Rain15%

Cloud62%

Humid airLow

Sun intensityMinimal

Best window

Data table

View month-by-month numbers

Month	High°F	Low°F	Rainin	Wet days	Sunh	Humidity%
Jan	28	20	2.0	12	1.3	90
Feb	28	19	1.7	10	2.6	88
Mar	35	23	1.4	8	4.2	81
Apr	47	33	1.5	8	6.0	73
May	58	42	1.8	9	8.9	68
Jun	66	51	2.9	11	9.9	70
Jul	71	57	3.3	13	8.9	75
Aug	69	55	3.1	13	7.2	79
Sep	60	47	2.3	10	4.5	84
Oct	48	39	2.4	12	2.9	87
Nov	39	33	2.3	12	1.2	91
Dec	33	26	2.3	12	0.9	90

Similar climates

Want a side-by-side climate view? Compare Helsinki with Warsaw.

Climate data notePlanning guidance, not a forecast

Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.

Sunshine: source type is not yet identified at metric level.

Local microclimates can vary by beach, neighborhood, trail, or elevation.

Last updated: Jun 1, 2026

Data & methodology

Month

High°F

Low°F

Rainin

Wet days

Sunh

Humidity%

Jan

2.0

1.3

Feb

1.7

2.6

Mar

1.4

4.2

Apr

1.5

6.0

May

1.8

8.9

Jun

2.9

9.9

Jul

3.3

8.9

Aug

3.1

7.2

Sep

2.3

4.5

Oct

2.4

2.9

Nov

2.3

1.2

Dec

2.3

0.9

Month	High°F	Low°F	Rainin	Wet days	Sunh	Humidity%
Jan	28	20	2.0	12	1.3	90
Feb	28	19	1.7	10	2.6	88
Mar	35	23	1.4	8	4.2	81
Apr	47	33	1.5	8	6.0	73
May	58	42	1.8	9	8.9	68
Jun	66	51	2.9	11	9.9	70
Jul	71	57	3.3	13	8.9	75
Aug	69	55	3.1	13	7.2	79
Sep	60	47	2.3	10	4.5	84
Oct	48	39	2.4	12	2.9	87
Nov	39	33	2.3	12	1.2	91
Dec	33	26	2.3	12	0.9	90

Month	High°F	Low°F	Rainin	Wet days	Sunh	Humidity%
Jan	28	20	2.0	12	1.3	90
Feb	28	19	1.7	10	2.6	88
Mar	35	23	1.4	8	4.2	81
Apr	47	33	1.5	8	6.0	73
May	58	42	1.8	9	8.9	68
Jun	66	51	2.9	11	9.9	70
Jul	71	57	3.3	13	8.9	75
Aug	69	55	3.1	13	7.2	79
Sep	60	47	2.3	10	4.5	84
Oct	48	39	2.4	12	2.9	87
Nov	39	33	2.3	12	1.2	91
Dec	33	26	2.3	12	0.9	90

Month	High°F	Low°F	Rainin	Wet days	Sunh	Humidity%
Jan	28	20	2.0	12	1.3	90
Feb	28	19	1.7	10	2.6	88
Mar	35	23	1.4	8	4.2	81
Apr	47	33	1.5	8	6.0	73
May	58	42	1.8	9	8.9	68
Jun	66	51	2.9	11	9.9	70
Jul	71	57	3.3	13	8.9	75
Aug	69	55	3.1	13	7.2	79
Sep	60	47	2.3	10	4.5	84
Oct	48	39	2.4	12	2.9	87
Nov	39	33	2.3	12	1.2	91
Dec	33	26	2.3	12	0.9	90

Month	High°F	Low°F	Rainin	Wet days	Sunh	Humidity%
Jan	28	20	2.0	12	1.3	90
Feb	28	19	1.7	10	2.6	88
Mar	35	23	1.4	8	4.2	81
Apr	47	33	1.5	8	6.0	73
May	58	42	1.8	9	8.9	68
Jun	66	51	2.9	11	9.9	70
Jul	71	57	3.3	13	8.9	75
Aug	69	55	3.1	13	7.2	79
Sep	60	47	2.3	10	4.5	84
Oct	48	39	2.4	12	2.9	87
Nov	39	33	2.3	12	1.2	91
Dec	33	26	2.3	12	0.9	90

Month	High°F	Low°F	Rainin	Wet days	Sunh	Humidity%
Jan	28	20	2.0	12	1.3	90
Feb	28	19	1.7	10	2.6	88
Mar	35	23	1.4	8	4.2	81
Apr	47	33	1.5	8	6.0	73
May	58	42	1.8	9	8.9	68
Jun	66	51	2.9	11	9.9	70
Jul	71	57	3.3	13	8.9	75
Aug	69	55	3.1	13	7.2	79
Sep	60	47	2.3	10	4.5	84
Oct	48	39	2.4	12	2.9	87
Nov	39	33	2.3	12	1.2	91
Dec	33	26	2.3	12	0.9	90

Month	High°F	Low°F	Rainin	Wet days	Sunh	Humidity%
Jan	28	20	2.0	12	1.3	90
Feb	28	19	1.7	10	2.6	88
Mar	35	23	1.4	8	4.2	81
Apr	47	33	1.5	8	6.0	73
May	58	42	1.8	9	8.9	68
Jun	66	51	2.9	11	9.9	70
Jul	71	57	3.3	13	8.9	75
Aug	69	55	3.1	13	7.2	79
Sep	60	47	2.3	10	4.5	84
Oct	48	39	2.4	12	2.9	87
Nov	39	33	2.3	12	1.2	91
Dec	33	26	2.3	12	0.9	90