Climate averages 1991–2020
Vantaa weather
in August.
A mild, moderately wet month: the 2nd warmest and one of the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Vantaa: daytime highs average 20.3°C and nights cool to about 13.3°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 76 mm of rain on roughly 12 days, which makes August a moderately wet month (one of the wettest months of the year). Daylight, from sunrise to sunset, lasts about 15 h 42 min on an average August day.
The nearest other city in this atlas is Helsinki (15 km away). In August its highs average 19.6°C, 0.7°C cooler than Vantaa, with 76 mm of rain.
Among the 13 cities listed in Finland, Vantaa ranks 1st of 13 for the warmest August highs and joint 9th of 13 for the driest August (rainfall, lowest first). The mean August high of those 13 cities is 19.2°C; Vantaa is 1.1°C warmer than that mean.
From August to September, average highs fall by 5.4°C to 14.9°C, and monthly rainfall falls from 76 mm to 57 mm.
The annual picture
August in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Vantaa climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.3°C-6.7°C | -6.7°C | 48 | 10.9 | 6.77 h |
| February | -2.8°C-7.7°C | -7.7°C | 41 | 9.3 | 9.09 h |
| March | 1.2°C-5.1°C | -5.1°C | 37 | 8.5 | 11.712 h |
| April | 8.1°C0.0°C | 0.0°C | 37 | 8.7 | 14.615 h |
| May | 14.8°C5.9°C | 5.9°C | 44 | 8.9 | 17.217 h |
| June | 19.0°C10.9°C | 10.9°C | 72 | 11.7 | 18.819 h |
| July | 21.9°C14.2°C | 14.2°C | 76 | 11.9 | 18.118 h |
| August, selected | 20.3°C13.3°C | 13.3°C | 76 | 12.3 | 15.716 h |
| September | 14.9°C9.0°C | 9.0°C | 57 | 10.4 | 13.013 h |
| October | 8.1°C3.7°C | 3.7°C | 59 | 11.1 | 10.210 h |
| November | 3.0°C-0.4°C | -0.4°C | 59 | 11.5 | 7.68 h |
| December | -0.2°C-4.1°C | -4.1°C | 55 | 12.2 | 6.06 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Helsinki in AugustFinland · 15 kmHigh 19.6°C · Low 13.9°C · 76 mm rain
- Espoo in AugustFinland · 24 kmHigh 19.5°C · Low 14.1°C · 70 mm rain
- Lahti in AugustFinland · 84 kmHigh 19.6°C · Low 12.9°C · 68 mm rain
- Tallinn in AugustEstonia · 97 kmHigh 20.3°C · Low 13.8°C · 77 mm rain
- Kouvola in AugustFinland · 111 kmHigh 19.8°C · Low 12.9°C · 66 mm rain
- Tampere in AugustFinland · 150 kmHigh 19.1°C · Low 13.2°C · 75 mm rain
- Turku in AugustFinland · 153 kmHigh 20.1°C · Low 12.9°C · 80 mm rain
- Lappeenranta in AugustFinland · 191 kmHigh 19.6°C · Low 13.1°C · 75 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Vantaa) is explained once on the Vantaa year overview and on the Sources, method and limits page.
Helsinki lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.