Climate averages 1991–2020
Lahti weather
in April.
A cold, fairly dry month: the 6th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a cold month in Lahti: daytime highs average 7.4°C and nights cool to about -0.6°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 35 mm of rain on roughly 9 days, which makes April a fairly dry month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 38 min on an average April day.
The nearest other city in this atlas is Kouvola (58 km away). In April its highs average 7.3°C, about as warm as Lahti, with 35 mm of rain.
Among the 13 cities listed in Finland, Lahti ranks 3rd of 13 for the warmest April highs and joint 7th of 13 for the driest April (rainfall, lowest first). The mean April high of those 13 cities is 6.3°C; Lahti is 1.1°C warmer than that mean.
From April to May, average highs rise by 7.1°C to 14.5°C, and monthly rainfall rises from 35 mm to 48 mm.
The annual picture
April 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, selected | 7.4°C-0.6°C | -0.6°C | 35 | 8.8 | 14.615 h |
| May | 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
April in nearby cities
- Kouvola in AprilFinland · 58 kmHigh 7.3°C · Low -0.9°C · 35 mm rain
- Vantaa in AprilFinland · 84 kmHigh 8.1°C · Low 0.0°C · 37 mm rain
- Helsinki in AprilFinland · 99 kmHigh 6.9°C · Low 0.3°C · 37 mm rain
- Espoo in AprilFinland · 103 kmHigh 6.7°C · Low 0.5°C · 37 mm rain
- Tampere in AprilFinland · 116 kmHigh 6.3°C · Low -0.7°C · 33 mm rain
- Lappeenranta in AprilFinland · 136 kmHigh 5.6°C · Low -1.2°C · 33 mm rain
- Jyväskylä in AprilFinland · 140 kmHigh 6.0°C · Low -1.4°C · 35 mm rain
- Vyborg in AprilRussia · 170 kmHigh 6.7°C · Low -0.4°C · 35 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.