Helsinki Weather in August
Average highs run from 20°C on August 1 to 17°C on August 31, and lows from 16°C to 14°C. Normal precipitation for the month is 68 mm over about 12 wet days.
August day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
August at a glance
- Average high
- 19°C
- Average low
- 15°C
- Precipitation
- 68 mm
- Reanalysis high
- 26°CAug 8, 2010
- Reanalysis low
- 9°CAug 31, 2008
- Daylight
- 16 h 52 min to 14 h 16 min
- Cloud cover
- 63%
- Humidity
- 80%
- Dew point
- 13°C
- Wind
- 15.1 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Aug 1 | 20°C | 16°C | 26°C 2018 | 12°C 1992 | 35% |
| Aug 2 | 20°C | 16°C | 25°C 2018 | 13°C 2019 | 35% |
| Aug 3 | 20°C | 16°C | 24°C 2018 | 12°C 2001 | 35% |
| Aug 4 | 20°C | 16°C | 25°C 2014 | 12°C 2019 | 37% |
| Aug 5 | 20°C | 16°C | 25°C 2014 | 12°C 1996 | 38% |
| Aug 6 | 20°C | 16°C | 25°C 2014 | 12°C 1999 | 39% |
| Aug 7 | 20°C | 16°C | 26°C 2010 | 11°C 1999 | 39% |
| Aug 8 | 20°C | 16°C | 26°C 2010 | 11°C 1995 | 40% |
| Aug 9 | 20°C | 16°C | 25°C 2018 | 11°C 1995 | 40% |
| Aug 10 | 19°C | 16°C | 25°C 2018 | 11°C 2012 | 41% |
| Aug 11 | 19°C | 16°C | 25°C 1992 | 11°C 1995 | 42% |
| Aug 12 | 19°C | 15°C | 24°C 2002 | 12°C 2016 | 42% |
| Aug 13 | 19°C | 15°C | 24°C 2010 | 13°C 1998 | 42% |
| Aug 14 | 19°C | 15°C | 24°C 2010 | 11°C 2004 | 41% |
| Aug 15 | 19°C | 15°C | 24°C 2002 | 11°C 1997 | 42% |
| Aug 16 | 19°C | 15°C | 23°C 2002 | 12°C 1998 | 42% |
| Aug 17 | 19°C | 15°C | 22°C 2018 | 11°C 1994 | 43% |
| Aug 18 | 19°C | 15°C | 21°C 2002 | 12°C 1994 | 44% |
| Aug 19 | 19°C | 15°C | 22°C 2006 | 11°C 1998 | 44% |
| Aug 20 | 19°C | 15°C | 22°C 2006 | 11°C 2009 | 43% |
| Aug 21 | 18°C | 15°C | 24°C 2002 | 11°C 1992 | 44% |
| Aug 22 | 18°C | 15°C | 22°C 1996 | 12°C 1999 | 44% |
| Aug 23 | 18°C | 14°C | 22°C 2015 | 10°C 1999 | 44% |
| Aug 24 | 18°C | 14°C | 22°C 2002 | 11°C 2000 | 44% |
| Aug 25 | 18°C | 14°C | 22°C 2002 | 11°C 2000 | 43% |
| Aug 26 | 18°C | 14°C | 23°C 1997 | 10°C 1993 | 43% |
| Aug 27 | 18°C | 14°C | 25°C 1997 | 9°C 1993 | 43% |
| Aug 28 | 18°C | 14°C | 23°C 1997 | 10°C 2003 | 44% |
| Aug 29 | 17°C | 14°C | 22°C 2019 | 10°C 1994 | 44% |
| Aug 30 | 17°C | 14°C | 21°C 1997 | 9°C 1993 | 44% |
| Aug 31 | 17°C | 14°C | 21°C 1996 | 9°C 2008 | 45% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+3).
- August 1
- sunrise 5:00 AM, sunset 9:52 PM
- August 31
- sunrise 6:12 AM, sunset 8:28 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.