Best time to visit Lahti
The best time to visit Lahti is June–July, judged on twenty years of weather records and the events worth going for.
Lahti, Paijat-Hame, Finland
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | -3.6 °C / 26 °F | -8.2 °C / 17 °F | 47 mm / 1.8 in | neither best nor good |
| February | -3 °C / 27 °F | -8.1 °C / 17 °F | 38 mm / 1.5 in | neither best nor good |
| March | 1.8 °C / 35 °F | -5 °C / 23 °F | 34 mm / 1.3 in | neither best nor good |
| April | 7.9 °C / 46 °F | -0.1 °C / 32 °F | 41 mm / 1.6 in | neither best nor good |
| May | 15.1 °C / 59 °F | 5.7 °C / 42 °F | 49 mm / 1.9 in | good month |
| June | 19.2 °C / 67 °F | 10.6 °C / 51 °F | 73 mm / 2.9 in | best month |
| July | 21.6 °C / 71 °F | 13.4 °C / 56 °F | 77 mm / 3 in | best month |
| August | 20 °C / 68 °F | 12.1 °C / 54 °F | 76 mm / 3 in | good month |
| September | 14.8 °C / 59 °F | 8.2 °C / 47 °F | 58 mm / 2.3 in | good month |
| October | 7.9 °C / 46 °F | 3.2 °C / 38 °F | 59 mm / 2.3 in | neither best nor good |
| November | 2.9 °C / 37 °F | -0.4 °C / 31 °F | 50 mm / 2 in | neither best nor good |
| December | -0.6 °C / 31 °F | -4.3 °C / 24 °F | 55 mm / 2.2 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: good
- JJune: best
- JJuly: best
- AAugust: good
- SSeptember: good
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Best
- June–July
- Good
- May, August–September
Why these months
May · good
In its favour: precipitation 49 mm / 1.9 in, share of daylight that is sunny 73%, days with heavy rain 0.9 days, average daily high 15.1 °C / 59 °F, wet days 9.7 days, relative humidity 64%, average daily low 5.7 °C / 42 °F.
Against: feels like (high) 12.1 °C / 54 °F.
June · best
In its favour: feels like (high) 17.5 °C / 64 °F, average daily high 19.2 °C / 67 °F, share of daylight that is sunny 72%, precipitation 73 mm / 2.9 in, days with heavy rain 1.8 days, average daily low 10.6 °C / 51 °F, relative humidity 69%.
Against: wet days 12.2 days.
July · best
In its favour: feels like (high) 20.9 °C / 70 °F, average daily high 21.6 °C / 71 °F, share of daylight that is sunny 73%, precipitation 77 mm / 3 in, days with heavy rain 2.1 days, average daily low 13.4 °C / 56 °F, relative humidity 74%.
Against: wet days 12.4 days.
August · good
In its favour: feels like (high) 19.1 °C / 66 °F, average daily high 20 °C / 68 °F, share of daylight that is sunny 69%, precipitation 76 mm / 3 in, days with heavy rain 2.2 days, average daily low 12.1 °C / 54 °F.
Against: wet days 12.8 days, relative humidity 79%.
September · good
In its favour: precipitation 58 mm / 2.3 in, share of daylight that is sunny 53%, feels like (high) 13 °C / 55 °F, days with heavy rain 1.1 days, average daily high 14.8 °C / 59 °F, wet days 10.7 days, average daily low 8.2 °C / 47 °F.
Against: relative humidity 85%.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: good
- MMay: best
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: good
- NNovember: neither
- DDecember: neither
- Best
- May–September
- Good
- April, October
Why these months
April · good
In its favour: precipitation 41 mm / 1.6 in, days with heavy rain 0.6 days, average daily high 7.9 °C / 46 °F, wet days 9 days, share of daylight that is sunny 67%, daylight per day 14.7 h, wind (daily max) 16 km/h / 10 mph, average daily low -0.1 °C / 32 °F.
Against: feels like (high) 3.9 °C / 39 °F.
May · best
In its favour: average daily high 15.1 °C / 59 °F, precipitation 49 mm / 1.9 in, days with heavy rain 0.9 days, wet days 9.7 days, feels like (high) 12.1 °C / 54 °F, average daily low 5.7 °C / 42 °F, share of daylight that is sunny 73%, daylight per day 17.4 h, wind (daily max) 15 km/h / 10 mph.
June · best
In its favour: average daily high 19.2 °C / 67 °F, precipitation 73 mm / 2.9 in, days with heavy rain 1.8 days, feels like (high) 17.5 °C / 64 °F, average daily low 10.6 °C / 51 °F, share of daylight that is sunny 72%, daylight per day 19.1 h, wet days 12.2 days, wind (daily max) 15 km/h / 9 mph.
July · best
In its favour: average daily high 21.6 °C / 71 °F, precipitation 77 mm / 3 in, days with heavy rain 2.1 days, feels like (high) 20.9 °C / 70 °F, average daily low 13.4 °C / 56 °F, share of daylight that is sunny 73%, daylight per day 18.2 h, wet days 12.4 days, wind (daily max) 14 km/h / 9 mph.
August · best
In its favour: average daily high 20 °C / 68 °F, precipitation 76 mm / 3 in, days with heavy rain 2.2 days, feels like (high) 19.1 °C / 66 °F, average daily low 12.1 °C / 54 °F, share of daylight that is sunny 69%, daylight per day 15.7 h, wind (daily max) 14 km/h / 9 mph.
Against: wet days 12.8 days.
September · best
In its favour: average daily high 14.8 °C / 59 °F, precipitation 58 mm / 2.3 in, days with heavy rain 1.1 days, feels like (high) 13 °C / 55 °F, average daily low 8.2 °C / 47 °F, share of daylight that is sunny 53%, daylight per day 12.9 h, wet days 10.7 days, wind (daily max) 15 km/h / 10 mph.
October · good
In its favour: precipitation 59 mm / 2.3 in, days with heavy rain 1.2 days, average daily high 7.9 °C / 46 °F, average daily low 3.2 °C / 38 °F, wet days 11.8 days, share of daylight that is sunny 39%, wind (daily max) 16 km/h / 10 mph, daylight per day 10 h.
Against: feels like (high) 4.9 °C / 41 °F.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Klövsjö / Storhogna, 625 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | -8 °C | -7.3 °C | -2.6 °C | 3.9 °C | 12.1 °C | 17.5 °C | 20.9 °C | 19.1 °C | 13 °C | 4.9 °C | -0.7 °C | -4.8 °C |
| Days with heavy rain | 0.5 days | 0.5 days | 0.3 days | 0.6 days | 0.9 days | 1.8 days | 2.1 days | 2.2 days | 1.1 days | 1.2 days | 0.9 days | 0.5 days |
| Time rain usually falls | 10 am | 8 pm | 10 pm | 4 pm | 5 pm | 4 pm | 5 pm | 3 pm | 12 pm | 2 pm | 1 am | 10 pm |
| Sunshine per day | 1.4 h | 3.1 h | 6.8 h | 9.8 h | 12.8 h | 13.8 h | 13.4 h | 10.9 h | 6.8 h | 3.9 h | 1.3 h | 0.9 h |
| Relative humidity | 91% | 89% | 80% | 71% | 64% | 69% | 74% | 79% | 85% | 88% | 92% | 92% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 3.7 µg/m³ | 5.1 µg/m³ | 6 µg/m³ | 7.2 µg/m³ | 6.9 µg/m³ | 8.4 µg/m³ | 6.6 µg/m³ | 6.1 µg/m³ | 5.4 µg/m³ | 3.7 µg/m³ | 3.2 µg/m³ | 3.8 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 6.9 µg/m³ | 9 µg/m³ | 10.5 µg/m³ | 11.9 µg/m³ | 11.6 µg/m³ | 14.1 µg/m³ | 10.6 µg/m³ | 9.4 µg/m³ | 8.6 µg/m³ | 6.3 µg/m³ | 5.5 µg/m³ | 6.8 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.