Lahti weather in May

In May, Lahti sees average daytime highs of 15°C and overnight lows near 5°C, with 48 mm of precipitation across 10 wet days and about 17 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 12°C in the first days to 17°C by the end. The sky is clear or mostly clear about 24% of the time in May, and the air most often feels dry.

Daylight stretches from about 15 h 42 min at the start of May to 18 h 06 min by month's end. Set against the rest of the year, May is Lahti's 1st-clearest and 9th-windiest month. For the whole year in context, see Lahti's year-round climate.

Daytime high: 15°; 4th warmest
Overnight low: 5°; 8th coldest
Precipitation: 48 mm; 10 wet days
Daylight: 17 hours; 3:43 AM – 8:44 PM
Cloud cover: 63%; 1st clearest
Wind: 11 km/h; 9th windiest
Solar energy: 5.14 kWh/m²
Travel score: 4.3; out of 10

Air quality: Excellent; PM2.5 4.3 µg/m³ · 2019

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← April Lahti year-round climate June →Best places to visit in May

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 12°C in the first days to 17°C by the end.

A typical May day in Lahti reaches about 15°C in the afternoon and slips back to 5°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 21°C. Set against its neighbours, May runs about 7°C warmer than April and about 4°C cooler than June.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	12	12	12	12	13	13	13	13	13	14	14	14	14	14	14	15	15	15	15	15	15	16	16	16	16	16	16	17	17	17	17
Avg low (°C)	2	3	3	3	3	3	3	4	4	4	4	4	5	5	5	5	5	6	6	6	6	6	7	7	7	7	7	8	8	8	8

	Avg high (°C)	Avg low (°C)
1	12	2
2	12	3
3	12	3
4	12	3
5	13	3
6	13	3
7	13	3
8	13	4
9	13	4
10	14	4
11	14	4
12	14	4
13	14	5
14	14	5
15	14	5
16	15	5
17	15	5
18	15	6
19	15	6
20	15	6
21	15	6
22	16	6
23	16	7
24	16	7
25	16	7
26	16	7
27	16	7
28	17	8
29	17	8
30	17	8
31	17	8

How May really feels in Lahti

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 4 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in May is cold — wind chill drags the overnight "feels like" below the raw low.

Lahti weather by month

How May compares with the rest of the year at a glance. May is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	-3° / -8°	41	10.3	10.7	6.1	0.0
Feb	-3° / -9°	34	8.2	8.7	8.5	0.0
Mar	1° / -6°	33	8.4	8.2	11.3	0.0
Apr	8° / -1°	35	8.8	3.4	14.2	1.3
May	15° / 5°	48	10	0.2	17	4.3
Jun	19° / 10°	75	12.3	0	18.7	5.5
Jul	21° / 13°	76	12.4	0	18	6.1
Aug	20° / 12°	68	11.7	0	15.5	5.8
Sep	14° / 7°	51	9.8	0	12.6	4.0
Oct	7° / 3°	56	11.1	1.6	9.7	1.0
Nov	2° / -1°	50	10.8	5.5	6.9	0.0
Dec	-1° / -5°	48	11.6	9.9	5.3	0.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in May, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 61%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	39	38	39	39	38	38	39	40	39	39	40	41	41	39	39	39	40	39	39	39	39	39	38	38	38	39	38	38	39	39	39
Cloudier (%)	61	62	61	61	62	62	61	60	61	61	60	59	59	61	61	61	60	61	61	61	61	61	62	62	62	61	62	62	61	61	61

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	39	61
4	39	61
5	38	62
6	38	62
7	39	61
8	40	60
9	39	61
10	39	61
11	40	60
12	41	59
13	41	59
14	39	61
15	39	61
16	39	61
17	40	60
18	39	61
19	39	61
20	39	61
21	39	61
22	39	61
23	38	62
24	38	62
25	38	62
26	39	61
27	38	62
28	38	62
29	39	61
30	39	61
31	39	61

Chance of precipitation in May

Any precipitationSnow

Lahti gets around 48 mm of rain and snow over 10 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 32% and peaks near 36% on the wettest days, and about 0 day brings snow. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	29	29	29	29	29	29	29	29	29	29	29	29	29	29	29	30	30	31	32	33	33	34	35	35	35	35	36	36	36	36	36
Snow chance (%)	3	3	3	2	2	2	2	2	1	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0

	Rain chance (%)	Snow chance (%)
1	29	3
2	29	3
3	29	3
4	29	2
5	29	2
6	29	2
7	29	2
8	29	2
9	29	1
10	29	1
11	29	1
12	29	1
13	29	1
14	29	1
15	29	1
16	30	1
17	30	1
18	31	1
19	32	1
20	33	1
21	33	1
22	34	0
23	35	0
24	35	0
25	35	0
26	35	0
27	36	0
28	36	0
29	36	0
30	36	0
31	36	0

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	99	99	99	99	99	99	98	98	98	98	98	98	98	97	97	97	97	97	96	96
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	2	2	2	2	2	2	2	3	3	3	3	3	4	4

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	97	3
26	97	3
27	97	3
28	97	3
29	97	3
30	96	4
31	96	4

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	11	calm
7	11	calm
8	11	calm
9	11	calm
10	11	calm
11	11	calm
12	11	calm
13	11	calm
14	11	calm
15	11	calm
16	11	calm
17	11	calm
18	11	calm
19	11	calm
20	11	calm
21	11	calm
22	11	calm
23	11	calm
24	11	calm
25	11	calm
26	11	calm
27	11	calm
28	11	calm
29	11	calm
30	11	calm
31	11	calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 15 h 42 min at the start of May to 18 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 144 minutes over May. Sunrise moves from 4:23 AM to 3:11 AM, and sunset from 8:06 PM to 9:18 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	15.7	15.8	15.9	16.0	16.1	16.2	16.2	16.3	16.4	16.5	16.6	16.7	16.8	16.9	16.9	17.0	17.1	17.2	17.3	17.3	17.4	17.5	17.6	17.6	17.7	17.8	17.9	17.9	18.0	18.1	18.1
Sunrise (AM)	4:23	4:20	4:18	4:15	4:12	4:09	4:06	4:04	4:01	3:58	3:56	3:53	3:50	3:48	3:45	3:43	3:41	3:38	3:36	3:33	3:31	3:29	3:27	3:25	3:23	3:21	3:19	3:17	3:15	3:13	3:11
Sunset (PM)	8:06	8:08	8:11	8:14	8:16	8:19	8:21	8:24	8:27	8:29	8:32	8:34	8:37	8:39	8:42	8:44	8:47	8:49	8:52	8:54	8:56	8:59	9:01	9:03	9:06	9:08	9:10	9:12	9:14	9:16	9:18

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	15.7	4:23	8:06
2	15.8	4:20	8:08
3	15.9	4:18	8:11
4	16.0	4:15	8:14
5	16.1	4:12	8:16
6	16.2	4:09	8:19
7	16.2	4:06	8:21
8	16.3	4:04	8:24
9	16.4	4:01	8:27
10	16.5	3:58	8:29
11	16.6	3:56	8:32
12	16.7	3:53	8:34
13	16.8	3:50	8:37
14	16.9	3:48	8:39
15	16.9	3:45	8:42
16	17.0	3:43	8:44
17	17.1	3:41	8:47
18	17.2	3:38	8:49
19	17.3	3:36	8:52
20	17.3	3:33	8:54
21	17.4	3:31	8:56
22	17.5	3:29	8:59
23	17.6	3:27	9:01
24	17.6	3:25	9:03
25	17.7	3:23	9:06
26	17.8	3:21	9:08
27	17.9	3:19	9:10
28	17.9	3:17	9:12
29	18.0	3:15	9:14
30	18.1	3:13	9:16
31	18.1	3:11	9:18

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.14 kWh/m².

For context, solar energy here swings from a low near 0.12 kWh/m² to a high of 5.28 kWh/m² in June across the year — May's 5.14 kWh/m² sits near the top of that range.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	4.6	4.6	4.7	4.7	4.8	4.8	4.9	4.9	5.0	5.0	5.0	5.1	5.1	5.1	5.2	5.2	5.2	5.2	5.2	5.3	5.3	5.3	5.3	5.3	5.3	5.3	5.4	5.4	5.4	5.4	5.4
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.6	Bright
2	4.6	Bright
3	4.7	Bright
4	4.7	Bright
5	4.8	Bright
6	4.8	Bright
7	4.9	Bright
8	4.9	Bright
9	5.0	Bright
10	5.0	Bright
11	5.0	Bright
12	5.1	Bright
13	5.1	Bright
14	5.1	Bright
15	5.2	Bright
16	5.2	Bright
17	5.2	Bright
18	5.2	Bright
19	5.2	Bright
20	5.3	Bright
21	5.3	Bright
22	5.3	Bright
23	5.3	Bright
24	5.3	Bright
25	5.3	Bright
26	5.3	Bright
27	5.4	Bright
28	5.4	Bright
29	5.4	Bright
30	5.4	Bright
31	5.4	Bright

Planning a trip in May

Is May a good time to visit Lahti?

Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.3

Sightseeing

4th-best month of the year

0.3

Beach & pool

4th-best month of the year

May is a reasonable time to visit Lahti for sightseeing.

What to pack for Lahti in May

From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In May, Lahti sees daytime highs around 15°C and nights near 5°C. Worth packing: a warm layer, rain gear and sun protection. About 10 days see rain.

a warm layerrain gearsun protection

UV index in Lahti in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Lahti peaks around June 19 at about 5 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	1	2	3	4	5	5	4	2	1	0	0
Level	Low	Low	Low	Moderate	Moderate	High	Moderate	Moderate	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	1	Low
Mar	2	Low
Apr	3	Moderate
May	4	Moderate
Jun	5	High
Jul	5	Moderate
Aug	4	Moderate
Sep	2	Moderate
Oct	1	Low
Nov	0	Low
Dec	0	Low

Location & terrain

Where is Lahti?

Lahti sits at 61.0°N, 25.7°E, 105 m above sea level, in Finland. The nearest listed city is Hollola, 9.0 km away.

Topography around Lahti

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lahti.

Within 3 km, the terrain around Lahti has only modest variations in elevation — a maximum elevation change of 91 m around an average of 104 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 164 m; within 80 km, only modest variations in elevation — a maximum elevation change of 226 m.

The land around Lahti is covered by trees (51%) and artificial surfaces (35%) within 3 km, trees (65%) within 16 km, and trees (71%) within 80 km.

3 km

91 m

trees 51%

16 km

164 m

trees 65%

80 km

226 m

trees 71%

treesgrasslandcroplandartificial surfaceswater

← April Lahti year-round climate June →Best places to visit in May

May weather nearby: Hollola 9.0 km · Orimattila 20 km · Heinola 32 km · Mäntsälä 43 km · Riihimäki 55 km · Kouvola 58 km · Hyvinge 58 km · Janakkala 58 km

Finland travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 85% of US; price level, 2025
GDP per capita: $56,149; 2025
Happiness: 7.8 / 10; World Happiness, 2025
Safe drinking water: 100%; of population, 2024
Homicide rate: 1; per 100k, 2023
Road deaths: 3.9; per 100k/yr, 2019
Income group: High; World Bank
English: Very high; EF EPI 603
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Lahti (60.9827°, 25.6615°, elevation 105 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	12	2
2	12	3
3	12	3
4	12	3
5	13	3
6	13	3
7	13	3
8	13	4
9	13	4
10	14	4
11	14	4
12	14	4
13	14	5
14	14	5
15	14	5
16	15	5
17	15	5
18	15	6
19	15	6
20	15	6
21	15	6
22	16	6
23	16	7
24	16	7
25	16	7
26	16	7
27	16	7
28	17	8
29	17	8
30	17	8
31	17	8

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	39	61
4	39	61
5	38	62
6	38	62
7	39	61
8	40	60
9	39	61
10	39	61
11	40	60
12	41	59
13	41	59
14	39	61
15	39	61
16	39	61
17	40	60
18	39	61
19	39	61
20	39	61
21	39	61
22	39	61
23	38	62
24	38	62
25	38	62
26	39	61
27	38	62
28	38	62
29	39	61
30	39	61
31	39	61

	Rain chance (%)	Snow chance (%)
1	29	3
2	29	3
3	29	3
4	29	2
5	29	2
6	29	2
7	29	2
8	29	2
9	29	1
10	29	1
11	29	1
12	29	1
13	29	1
14	29	1
15	29	1
16	30	1
17	30	1
18	31	1
19	32	1
20	33	1
21	33	1
22	34	0
23	35	0
24	35	0
25	35	0
26	35	0
27	36	0
28	36	0
29	36	0
30	36	0
31	36	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	97	3
26	97	3
27	97	3
28	97	3
29	97	3
30	96	4
31	96	4

	Avg high (°C)	Avg low (°C)
1	12	2
2	12	3
3	12	3
4	12	3
5	13	3
6	13	3
7	13	3
8	13	4
9	13	4
10	14	4
11	14	4
12	14	4
13	14	5
14	14	5
15	14	5
16	15	5
17	15	5
18	15	6
19	15	6
20	15	6
21	15	6
22	16	6
23	16	7
24	16	7
25	16	7
26	16	7
27	16	7
28	17	8
29	17	8
30	17	8
31	17	8

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	39	61
4	39	61
5	38	62
6	38	62
7	39	61
8	40	60
9	39	61
10	39	61
11	40	60
12	41	59
13	41	59
14	39	61
15	39	61
16	39	61
17	40	60
18	39	61
19	39	61
20	39	61
21	39	61
22	39	61
23	38	62
24	38	62
25	38	62
26	39	61
27	38	62
28	38	62
29	39	61
30	39	61
31	39	61

	Rain chance (%)	Snow chance (%)
1	29	3
2	29	3
3	29	3
4	29	2
5	29	2
6	29	2
7	29	2
8	29	2
9	29	1
10	29	1
11	29	1
12	29	1
13	29	1
14	29	1
15	29	1
16	30	1
17	30	1
18	31	1
19	32	1
20	33	1
21	33	1
22	34	0
23	35	0
24	35	0
25	35	0
26	35	0
27	36	0
28	36	0
29	36	0
30	36	0
31	36	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	97	3
26	97	3
27	97	3
28	97	3
29	97	3
30	96	4
31	96	4

	Avg high (°C)	Avg low (°C)
1	12	2
2	12	3
3	12	3
4	12	3
5	13	3
6	13	3
7	13	3
8	13	4
9	13	4
10	14	4
11	14	4
12	14	4
13	14	5
14	14	5
15	14	5
16	15	5
17	15	5
18	15	6
19	15	6
20	15	6
21	15	6
22	16	6
23	16	7
24	16	7
25	16	7
26	16	7
27	16	7
28	17	8
29	17	8
30	17	8
31	17	8

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	39	61
4	39	61
5	38	62
6	38	62
7	39	61
8	40	60
9	39	61
10	39	61
11	40	60
12	41	59
13	41	59
14	39	61
15	39	61
16	39	61
17	40	60
18	39	61
19	39	61
20	39	61
21	39	61
22	39	61
23	38	62
24	38	62
25	38	62
26	39	61
27	38	62
28	38	62
29	39	61
30	39	61
31	39	61

	Rain chance (%)	Snow chance (%)
1	29	3
2	29	3
3	29	3
4	29	2
5	29	2
6	29	2
7	29	2
8	29	2
9	29	1
10	29	1
11	29	1
12	29	1
13	29	1
14	29	1
15	29	1
16	30	1
17	30	1
18	31	1
19	32	1
20	33	1
21	33	1
22	34	0
23	35	0
24	35	0
25	35	0
26	35	0
27	36	0
28	36	0
29	36	0
30	36	0
31	36	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	97	3
26	97	3
27	97	3
28	97	3
29	97	3
30	96	4
31	96	4