Finland climate by month
8-year averages · when to visit| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 0° | -1° | 2° | 8° | 14° | 19° | 21° | 20° | 16° | 10° | 5° | 1° |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 16 | 11 | 11 | 10 | 9 | 10 | 12 | 13 | 12 | 14 | 13 | 15 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 0° | 0° | 1° | 4° | 10° | 16° | 19° | 20° | 17° | 11° | 7° | 4° |
Figures are averaged over 8 years of ERA5 reanalysis; sea temps come from ocean reanalysis, and UV is derived from solar elevation.
Helsinki climate in September
8-year averages · when to visitBest months: June–August · September: Acceptable
| August | September | October | |
|---|---|---|---|
| Average temperature | ▼ 17°C | 13°C | ▼ 8°C |
| Typical high | ▼ 20°C | 16°C | ▼ 10°C |
| Typical low | ▼ 14°C | 10°C | ▼ 5°C |
| Water temperature | ▼ 20.0°C | 16.9°C | ▼ 11.0°C |
| Precipitation | ▼ 87 mm | 78 mm | ▲ 83 mm |
| Wet days | ▼ 13 d | 12 d | ▲ 14 d |
| Humidity | ▲ 78% | 83% | → 83% |
| Sunshine per day | ▼ 11.3 h | 8.6 h | ▼ 4.9 h |
| Cloud cover | ▲ 27% | 33% | ▲ 51% |
| Midday UV | ▼ 6 | 4 | ▼ 2 |
| Daylight | 15:36 | 12:52 | 10:06 |
| Our take | Good | Acceptable | Poor |
September temperatures day by day daily mean + smoothed trend · °C
September precipitation day by day mm
September UV day by day clear-sky midday value
Figures are averaged over 8 years of ERA5 reanalysis; sea temps come from ocean reanalysis, and UV is derived from solar elevation.
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NBM + global weather models
Updated: 9:51 PM
Finland · 9 weather points · Climate reference: Helsinki (60.17°N, 24.94°E) · Europe/Helsinki