Climate averages 1991–2020
Lahti weather
in July.
A mild, moderately wet month: the warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a mild month in Lahti: daytime highs average 21.2°C and nights cool to about 13.9°C. By daytime temperature it is the warmest month of the year.
Expect about 76 mm of rain on roughly 12 days, which makes July a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 18 h 19 min on an average July day.
The nearest other city in this atlas is Kouvola (58 km away). In July its highs average 21.5°C, about as warm as Lahti, with 66 mm of rain.
Among the 13 cities listed in Finland, Lahti ranks 5th of 13 for the warmest July highs and joint 5th of 13 for the driest July (rainfall, lowest first). The mean July high of those 13 cities is 20.8°C; Lahti is 0.4°C warmer than that mean.
From July to August, average highs fall by 1.6°C to 19.6°C, and monthly rainfall falls from 76 mm to 68 mm.
The annual picture
July 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 | 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, selected | 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
July in nearby cities
- Kouvola in JulyFinland · 58 kmHigh 21.5°C · Low 14.1°C · 66 mm rain
- Vantaa in JulyFinland · 84 kmHigh 21.9°C · Low 14.2°C · 76 mm rain
- Helsinki in JulyFinland · 99 kmHigh 20.8°C · Low 14.6°C · 76 mm rain
- Espoo in JulyFinland · 103 kmHigh 20.6°C · Low 14.7°C · 69 mm rain
- Tampere in JulyFinland · 116 kmHigh 20.7°C · Low 14.0°C · 83 mm rain
- Lappeenranta in JulyFinland · 136 kmHigh 21.5°C · Low 14.2°C · 73 mm rain
- Jyväskylä in JulyFinland · 140 kmHigh 20.6°C · Low 13.8°C · 87 mm rain
- Vyborg in JulyRussia · 170 kmHigh 21.2°C · Low 14.6°C · 64 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.