Climate averages 1991–2020
Turku weather
in May.
A cool, moderately wet month: the 5th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a cool month in Turku: daytime highs average 14.4°C and nights cool to about 5.4°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 41 mm of rain on roughly 9 days, which makes May a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 17 h 13 min on an average May day.
The nearest other city in this atlas is Pori (117 km away). In May its highs average 12.5°C, 1.9°C cooler than Turku, with 39 mm of rain.
Among the 13 cities listed in Finland, Turku ranks 4th of 13 for the warmest May highs and 2nd of 13 for the driest May (rainfall, lowest first). The mean May high of those 13 cities is 13.2°C; Turku is 1.2°C warmer than that mean.
From May to June, average highs rise by 4.1°C to 18.5°C, and monthly rainfall rises from 41 mm to 68 mm.
The annual picture
May 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
Turku climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.5°C-6.0°C | -6.0°C | 49 | 10.1 | 6.77 h |
| February | -2.0°C-7.2°C | -7.2°C | 38 | 8.5 | 9.09 h |
| March | 1.7°C-4.7°C | -4.7°C | 35 | 8.2 | 11.712 h |
| April | 8.2°C0.1°C | 0.1°C | 33 | 8.0 | 14.615 h |
| May, selected | 14.4°C5.4°C | 5.4°C | 41 | 8.9 | 17.217 h |
| June | 18.5°C10.2°C | 10.2°C | 68 | 10.8 | 18.919 h |
| July | 21.4°C13.6°C | 13.6°C | 85 | 12.3 | 18.118 h |
| August | 20.1°C12.9°C | 12.9°C | 80 | 12.5 | 15.716 h |
| September | 15.0°C8.8°C | 8.8°C | 58 | 9.5 | 13.013 h |
| October | 8.3°C3.7°C | 3.7°C | 59 | 10.4 | 10.210 h |
| November | 3.5°C0.0°C | 0.0°C | 55 | 10.9 | 7.58 h |
| December | 0.4°C-3.5°C | -3.5°C | 56 | 11.6 | 5.96 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
May in nearby cities
- Pori in MayFinland · 117 kmHigh 12.5°C · Low 5.6°C · 39 mm rain
- Espoo in MayFinland · 134 kmHigh 12.9°C · Low 6.2°C · 43 mm rain
- Mariehamn in MayAland Islands · 135 kmHigh 9.7°C · Low 6.1°C · 33 mm rain
- Tampere in MayFinland · 142 kmHigh 13.2°C · Low 5.2°C · 45 mm rain
- Helsinki in MayFinland · 150 kmHigh 13.1°C · Low 6.0°C · 44 mm rain
- Vantaa in MayFinland · 153 kmHigh 14.8°C · Low 5.9°C · 44 mm rain
- Tallinn in MayEstonia · 179 kmHigh 14.6°C · Low 6.1°C · 41 mm rain
- Lahti in MayFinland · 194 kmHigh 14.5°C · Low 5.6°C · 48 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 Turku) is explained once on the Turku year overview and on the Sources, method and limits page.