Helsinki Weather in May
Average highs run from 8°C on May 1 to 13°C on May 31, and lows from 3°C to 8°C. Normal precipitation for the month is 47 mm over about 9 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 11°C
- Average low
- 6°C
- Precipitation
- 47 mm
- Reanalysis high
- 22°CMay 24, 2014
- Reanalysis low
- -2°CMay 3, 1999
- Daylight
- 16 h 01 min to 18 h 18 min
- Cloud cover
- 62%
- Humidity
- 81%
- Dew point
- 5°C
- Wind
- 13.7 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 |
|---|---|---|---|---|---|
| May 1 | 8°C | 3°C | 14°C 1993 | -2°C 1996 | 25% |
| May 2 | 8°C | 3°C | 14°C 2008 | -1°C 1999 | 25% |
| May 3 | 9°C | 4°C | 15°C 2008 | -2°C 1999 | 26% |
| May 4 | 9°C | 4°C | 16°C 2016 | 0°C 1999 | 25% |
| May 5 | 9°C | 4°C | 15°C 2004 | 0°C 1997 | 25% |
| May 6 | 9°C | 4°C | 14°C 2004 | 0°C 2010 | 26% |
| May 7 | 9°C | 4°C | 17°C 2006 | 1°C 1991 | 24% |
| May 8 | 9°C | 4°C | 16°C 2001 | -1°C 1999 | 24% |
| May 9 | 10°C | 4°C | 15°C 1993 | 0°C 2017 | 24% |
| May 10 | 10°C | 5°C | 17°C 2011 | 0°C 2017 | 23% |
| May 11 | 10°C | 5°C | 16°C 2011 | -1°C 1999 | 24% |
| May 12 | 10°C | 5°C | 16°C 2018 | 0°C 1999 | 24% |
| May 13 | 10°C | 5°C | 18°C 2018 | 1°C 1999 | 24% |
| May 14 | 10°C | 5°C | 18°C 2018 | 1°C 2004 | 23% |
| May 15 | 11°C | 6°C | 19°C 2018 | 2°C 1995 | 24% |
| May 16 | 11°C | 6°C | 18°C 2018 | 1°C 2017 | 26% |
| May 17 | 11°C | 6°C | 18°C 2018 | 2°C 2004 | 27% |
| May 18 | 11°C | 6°C | 17°C 1993 | 3°C 1996 | 26% |
| May 19 | 11°C | 6°C | 19°C 1993 | 2°C 2002 | 27% |
| May 20 | 11°C | 6°C | 22°C 1993 | 1°C 1997 | 28% |
| May 21 | 11°C | 7°C | 20°C 2019 | 1°C 1998 | 28% |
| May 22 | 11°C | 7°C | 19°C 2018 | 3°C 2001 | 29% |
| May 23 | 12°C | 7°C | 20°C 2014 | 2°C 1997 | 29% |
| May 24 | 12°C | 7°C | 22°C 2014 | 2°C 1997 | 29% |
| May 25 | 12°C | 7°C | 20°C 2016 | 2°C 1998 | 28% |
| May 26 | 12°C | 7°C | 20°C 2018 | 1°C 2001 | 27% |
| May 27 | 12°C | 8°C | 18°C 2012 | 3°C 1998 | 27% |
| May 28 | 13°C | 8°C | 20°C 2007 | 3°C 1994 | 28% |
| May 29 | 13°C | 8°C | 19°C 1995 | 3°C 1994 | 28% |
| May 30 | 13°C | 8°C | 21°C 2009 | 4°C 2001 | 28% |
| May 31 | 13°C | 8°C | 21°C 1995 | 4°C 1999 | 26% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+3).
- May 1
- sunrise 5:18 AM, sunset 9:19 PM
- May 31
- sunrise 4:10 AM, sunset 10:28 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.