worldweather

Weather in Lahti - 14-day forecast

Detailed weather forecast for Lahti, Finland: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Lahti
today🌧️ 16°💧 0.7 mm
Sun🌧️ 12°💧 0.1 mm
Mon☀️ 13°💧 0.1 mm
Tue🌧️ 16°💧 0.3 mm
Wed🌧️ 18°💧 1.6 mm
Thu🌧️ 14°💧 3.4 mm
Fri🌤️ 15°💧 1.2 mm
Sat🌧️ 17°💧 1.5 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Sunday 6 Sept in Lahti, the forecast high is 12°C. Typical daytime temperatures at this time of year range from 14°C to 19°C, so it will be exceptionally cool. It is cooler than 90% of similar days.

16°Cnear normal
usually 14°C–19°C
night: near normal rain: typical rainfall wind: typical
12°Cexceptionally cool
usually 14°C–19°C
cooler than 90% of similar days
night: near normal rain: less rain than usual wind: exceptionally strong
13°Ccooler than usual
usually 14°C–19°C
cooler than 83% of similar days
night: near normal rain: less rain than usual wind: stronger than usual
16°Cnear normal
usually 13°C–19°C
night: exceptionally warm rain: typical rainfall wind: stronger than usual
18°Cwarmer than usual
usually 13°C–19°C
warmer than 71% of similar days
night: exceptionally warm rain: typical rainfall wind: exceptionally strong
14°Ccooler than usual
usually 13°C–18°C
cooler than 75% of similar days
night: warmer than usual rain: more rain than usual wind: exceptionally strong
15°Cnear normal
usually 13°C–18°C
night: warmer than usual rain: typical rainfall wind: exceptionally strong

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
5°15°25° 1981: 16°C1982: 13°C1983: 15°C1984: 14°C1985: 14°C1986: 12°C1987: 14°C1988: 18°C1989: 15°C1990: 13°C1991: 11°C1992: 16°C1993: 12°C1994: 15°C1995: 16°C1996: 11°C1997: 16°C1998: 16°C1999: 20°C2000: 14°C2001: 15°C2002: 20°C2003: 19°C2004: 15°C2005: 17°C2006: 17°C2007: 14°C2008: 14°C2009: 17°C2010: 17°C2011: 18°C2012: 14°C2013: 19°C2014: 20°C2015: 16°C2016: 18°C2017: 14°C2018: 20°C2019: 19°C2020: 15°C2021: 16°C2022: 14°C2023: 20°C2024: 23°C2025: 22°C 2026 forecast: 15°C current forecast 15°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 16°C by day. The coolest year was 1996 (11°C) and the warmest was 2024 (23°C). The current forecast averages 15°C - lower than in 64% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

Weather warnings - Lahti

No active weather warnings for Lahti (region: Päijät-Häme). The national weather service is not forecasting dangerous conditions.

14-day forecast - Lahti

Lahti - 14-day weather forecast infographic

Lahti 30 & 45-day weather - long-range outlook

Next 16 days · forecast
15°
around 11° at night · days with rain: 7
Weeks 3-4 · avg for September
15°
around 8° at night · rain chance 55%
Weeks 5-7 · avg for October
7°
around 2° at night · rain chance 44%
The 30 & 45-day outlook for Lahti: the next 16 days are a numerical forecast updated daily - on average 15° by day and 11° at night. Further out we rely on multi-year climate averages: around 15° in September, and about 7° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Lahti

Saturday5 September 2026
🌧️16°light rain
sunrise 06:18 · sunset 20:13 · night 10° · evening 14° · rain 0.71 mm · humidity 48% · wind 3 m/s · clouds 8%
Sunday6 September 2026
🌧️12°light rain
sunrise 06:21 · sunset 20:09 · night 8° · evening 12° · rain 0.11 mm · humidity 59% · wind 5 m/s · clouds 97%
Monday7 September 2026
☀️13°clear sky
sunrise 06:23 · sunset 20:06 · night 8° · evening 13° · rain 0.12 mm · humidity 43% · wind 4 m/s · clouds 8%
Tuesday8 September 2026
🌧️16°light rain
sunrise 06:26 · sunset 20:03 · night 14° · evening 17° · rain 0.31 mm · humidity 85% · wind 4 m/s · clouds 100%
Wednesday9 September 2026
🌧️18°light rain
sunrise 06:28 · sunset 20:00 · night 12° · evening 16° · rain 1.57 mm · humidity 66% · wind 5 m/s · clouds 61%
Thursday10 September 2026
🌧️14°light rain
sunrise 06:31 · sunset 19:57 · night 11° · evening 14° · rain 3.36 mm · humidity 84% · wind 4 m/s · clouds 100%
Friday11 September 2026
🌤️15°scattered clouds
sunrise 06:33 · sunset 19:54 · night 11° · evening 16° · rain 1.2 mm · humidity 64% · wind 5 m/s · clouds 27%
Saturday12 September 2026
🌧️17°light rain
sunrise 06:36 · sunset 19:51 · night 12° · evening 15° · rain 1.47 mm · humidity 65% · wind 3 m/s · clouds 67%
Sunday13 September 2026
🌧️15°light rain
sunrise 06:38 · sunset 19:47 · night 11° · evening 12° · rain 1.14 mm · humidity 73% · wind 3 m/s · clouds 100%
Monday14 September 2026
🌧️11°light rain
sunrise 06:40 · sunset 19:44 · night 8° · evening 11° · rain 0.24 mm · humidity 60% · wind 5 m/s · clouds 21%
Tuesday15 September 2026
☁️12°overcast clouds
sunrise 06:43 · sunset 19:41 · night 10° · evening 12° · rain 6.75 mm · humidity 57% · wind 4 m/s · clouds 100%
Wednesday16 September 2026
🌧️15°light rain
sunrise 06:45 · sunset 19:38 · night 12° · evening 14° · rain 0.12 mm · humidity 69% · wind 5 m/s · clouds 100%
Thursday17 September 2026
🌧️13°light rain
sunrise 06:48 · sunset 19:35 · night 12° · evening 13° · rain 2.25 mm · humidity 88% · wind 3 m/s · clouds 100%
Friday18 September 2026
🌧️15°light rain
sunrise 06:50 · sunset 19:32 · night 13° · evening 15° · rain 0.42 mm · humidity 81% · wind 3 m/s · clouds 73%
Saturday19 September 2026
☀️17°clear sky
sunrise 06:53 · sunset 19:28 · night 14° · evening 19° · humidity 65% · wind 3 m/s · clouds 2%
Sunday20 September 2026
☁️20°broken clouds
sunrise 06:55 · sunset 19:25 · night 14° · evening 20° · humidity 62% · wind 4 m/s · clouds 81%

UV index in Lahti - is it safe to sunbathe?

UV INDEX · 16-DAY FORECASTLahti03681111+3.8UV MODERATEtoday, daily maxSeek shade around midday. SPF 30+, sunglasses and ahat for longer stays.Unprotected fair skin may burn in about 55 min4Sat5.094Sun6.094Mon7.093Tue8.093Wed9.093Thu10.093Fri11.092Sat12.091Sun13.092Mon14.091Tue15.090Wed16.093Thu17.093Fri18.093Sat19.093Sun20.090-2 low3-5 moderate6-7 high8-10 very high11+ extremeworld-prices.com · 2026-09-05
Today the UV index in Lahti is 4 (moderate) - unprotected fair skin can burn in about 55 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.

Pollen in Lahti - info for allergy sufferers

PLANT POLLEN · 4-DAY FORECASTLahtiHighest pollen today: Grasses1 grains/m³ · low leveltoday5.09tomorrow6.09Mon7.09Tue8.09Grasses1-1-Ragweed-22-nonelowmoderatehighvery highoff season: alder, birch, mugwort, olive · values in grains/m³ (daily peak)pogodapodroze.pl · 2026-09-05
Today grasses pollen is highest in Lahti - about 1 grains/m³, low level. Most allergy sufferers should not feel strong symptoms. Pollen levels are a CAMS model forecast and are indicative.

Lahti weather through the year

Lahti - annual climate

Warmest, driest months on average: May, June, July, August.

Upcoming public holidays in Finland: All Saints' Day — 31 October · Independence Day — 6 December · Christmas Eve — 24 December.

Nearby and related places

VantaaOuluJyväskyläPoriHelsinkiRovaniemiEspoo

FAQ - Lahti weather

What is the weather like in Lahti today?
Today it is about 16° during the day and 10° at night, light rain.
How far ahead can I check the forecast for Lahti?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.