Climate averages 1991–2020
Lahti weather
in May.
A cool, moderately wet month: the 4th warmest and the joint 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a cool month in Lahti: daytime highs average 14.5°C and nights cool to about 5.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 48 mm of rain on roughly 10 days, which makes May a moderately wet month (the joint 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 17 h 22 min on an average May day.
The nearest other city in this atlas is Kouvola (58 km away). In May its highs average 14.7°C, about as warm as Lahti, with 46 mm of rain.
Among the 13 cities listed in Finland, Lahti ranks 3rd of 13 for the warmest May highs and joint 9th of 13 for the driest May (rainfall, lowest first). The mean May high of those 13 cities is 13.2°C; Lahti is 1.3°C warmer than that mean.
From May to June, average highs rise by 4.1°C to 18.6°C, and monthly rainfall rises from 48 mm to 75 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
Lahti climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -3.6°C-8.0°C | -8.0°C | 41 | 10.3 | 6.57 h |
| February | -3.7°C-8.7°C | -8.7°C | 34 | 8.2 | 9.09 h |
| March | 0.7°C-5.7°C | -5.7°C | 33 | 8.4 | 11.712 h |
| April | 7.4°C-0.6°C | -0.6°C | 35 | 8.8 | 14.615 h |
| May, selected | 14.5°C5.6°C | 5.6°C | 48 | 10.0 | 17.417 h |
| June | 18.6°C10.8°C | 10.8°C | 75 | 12.3 | 19.119 h |
| July | 21.2°C13.9°C | 13.9°C | 76 | 12.3 | 18.318 h |
| August | 19.6°C12.9°C | 12.9°C | 68 | 11.6 | 15.816 h |
| September | 14.1°C8.5°C | 8.5°C | 51 | 9.8 | 13.013 h |
| October | 7.0°C3.0°C | 3.0°C | 56 | 11.1 | 10.110 h |
| November | 1.8°C-1.3°C | -1.3°C | 50 | 10.8 | 7.47 h |
| December | -1.5°C-5.2°C | -5.2°C | 48 | 11.6 | 5.76 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
- Kouvola in MayFinland · 58 kmHigh 14.7°C · Low 5.8°C · 46 mm rain
- Vantaa in MayFinland · 84 kmHigh 14.8°C · Low 5.9°C · 44 mm rain
- Helsinki in MayFinland · 99 kmHigh 13.1°C · Low 6.0°C · 44 mm rain
- Espoo in MayFinland · 103 kmHigh 12.9°C · Low 6.2°C · 43 mm rain
- Tampere in MayFinland · 116 kmHigh 13.2°C · Low 5.2°C · 45 mm rain
- Lappeenranta in MayFinland · 136 kmHigh 14.0°C · Low 5.2°C · 46 mm rain
- Jyväskylä in MayFinland · 140 kmHigh 13.5°C · Low 5.1°C · 48 mm rain
- Vyborg in MayRussia · 170 kmHigh 13.6°C · Low 5.7°C · 45 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 Lahti) is explained once on the Lahti year overview and on the Sources, method and limits page.