Tatsuno weather in May

In May, Tatsuno sees average daytime highs of 19°C and overnight lows near 9°C, with 133 mm of precipitation across 12.1 wet days and about 13.9 hours of daylight. It is the 5th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 17°C in the first days to 20°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 13 h 24 min at the start of May to 14 h 12 min by month's end. Set against the rest of the year, May is Tatsuno's 8th-clearest and 6th-windiest month. For the whole year in context, see Tatsuno's year-round climate.

Daytime high: 19°; 5th warmest
Overnight low: 9°; 8th coldest
Precipitation: 133 mm; 12.1 wet days
Daylight: 13 h 54 min; 4:47 AM – 6:41 PM
Cloud cover: 66%; 8th clearest
Wind: 6 km/h; 6th windiest
Solar energy: 5.73 kWh/m²
Travel score: 5.7; out of 10

Tatsuno is town in Kamiina district, Nagano prefecture, Japan.

Density: 112/km²; people per km²
Founded: 1947

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

← April Tatsuno 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 17°C in the first days to 20°C by the end.

A typical May day in Tatsuno reaches about 19°C in the afternoon and slips back to 9°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 23°C. Set against its neighbours, May runs about 5°C warmer than April and about 3°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)	17	17	17	17	17	18	18	18	18	18	18	18	19	19	19	19	19	19	19	19	20	20	20	20	20	20	20	20	20	21	21
Avg low (°C)	6	6	6	7	7	7	7	7	8	8	8	8	8	8	9	9	9	9	9	9	9	10	10	10	10	10	10	11	11	11	11

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

How May really feels in Tatsuno

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 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

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Tatsuno weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 6th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	2° / -8°	85	11.5	12.4	9.8	0.0
Feb	3° / -7°	86	10.1	9.5	10.6	0.0
Mar	7° / -3°	142	13.3	8.9	11.7	0.9
Apr	14° / 3°	127	12.4	1.9	12.9	3.7
May	19° / 9°	133	12.1	0.1	13.9	5.7
Jun	22° / 14°	178	15.5	0	14.4	5.4
Jul	26° / 18°	198	17	0	14.2	5.5
Aug	27° / 18°	123	13.4	0	13.4	5.9
Sep	23° / 15°	159	12.8	0	12.2	6.1
Oct	17° / 8°	170	12.1	0.1	11.1	5.2
Nov	11° / 2°	97	10.4	1.7	10.1	2.8
Dec	5° / -4°	84	12	9.4	9.6	0.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 61%. Skies tend to cloud over as the month goes on.

	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 (%)	44	44	44	44	43	43	42	41	40	40	40	41	39	39	40	40	39	39	39	39	38	38	38	37	36	36	35	33	33	32	31
Cloudier (%)	56	56	56	56	57	57	58	59	60	60	60	59	61	61	60	60	61	61	61	61	62	62	62	63	64	64	65	67	67	68	69

	Clearer (%)	Cloudier (%)
1	44	56
2	44	56
3	44	56
4	44	56
5	43	57
6	43	57
7	42	58
8	41	59
9	40	60
10	40	60
11	40	60
12	41	59
13	39	61
14	39	61
15	40	60
16	40	60
17	39	61
18	39	61
19	39	61
20	39	61
21	38	62
22	38	62
23	38	62
24	37	63
25	36	64
26	36	64
27	35	65
28	33	67
29	33	67
30	32	68
31	31	69

Chance of precipitation in May

Any precipitation

Tatsuno gets around 133 mm of rain and snow over 12.1 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 39% and peaks near 40% on the wettest days, and about 0 day brings snow.

	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 (%)	38	38	38	38	38	38	38	38	39	39	39	39	39	40	39	39	39	39	39	39	39	39	38	38	38	38	38	38	38	38	39

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

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 96% 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 (%)	99	99	98	98	98	98	98	98	98	97	97	97	97	97	97	97	97	96	96	96	96	96	95	95	95	95	94	94	94	93	92
Comfortable (%)	1	1	2	2	2	2	2	2	2	3	3	3	3	3	3	3	3	4	4	4	4	4	5	5	5	5	6	6	6	7	8

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	98	2
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	97	3
11	97	3
12	97	3
13	97	3
14	97	3
15	97	3
16	97	3
17	97	3
18	96	4
19	96	4
20	96	4
21	96	4
22	96	4
23	95	5
24	95	5
25	95	5
26	95	5
27	94	6
28	94	6
29	94	6
30	93	7
31	92	8

Wind in May

Winds average 6 km/h in May.

Across May, daily wind ranges from about 5 km/h on the calmest days to 7 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)	7	7	7	7	7	7	7	7	7	7	7	7	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	5	5
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	7	calm
2	7	calm
3	7	calm
4	7	calm
5	7	calm
6	7	calm
7	7	calm
8	7	calm
9	7	calm
10	7	calm
11	7	calm
12	7	calm
13	6	calm
14	6	calm
15	6	calm
16	6	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	5	calm
31	5	calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 24 min at the start of May to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over May. Sunrise moves from 5:02 AM to 4:38 AM, and sunset from 6:29 PM to 6:53 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)	13.4	13.5	13.5	13.5	13.6	13.6	13.6	13.7	13.7	13.7	13.8	13.8	13.8	13.8	13.9	13.9	13.9	14.0	14.0	14.0	14.0	14.1	14.1	14.1	14.1	14.1	14.2	14.2	14.2	14.2	14.2
Sunrise (AM)	5:02	5:01	5:00	4:59	4:58	4:56	4:55	4:54	4:53	4:53	4:52	4:51	4:50	4:49	4:48	4:47	4:46	4:46	4:45	4:44	4:44	4:43	4:42	4:42	4:41	4:41	4:40	4:40	4:39	4:39	4:38
Sunset (PM)	6:29	6:29	6:30	6:31	6:32	6:33	6:34	6:35	6:35	6:36	6:37	6:38	6:39	6:40	6:40	6:41	6:42	6:43	6:44	6:44	6:45	6:46	6:47	6:48	6:48	6:49	6:50	6:51	6:51	6:52	6:53

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.4	5:02	6:29
2	13.5	5:01	6:29
3	13.5	5:00	6:30
4	13.5	4:59	6:31
5	13.6	4:58	6:32
6	13.6	4:56	6:33
7	13.6	4:55	6:34
8	13.7	4:54	6:35
9	13.7	4:53	6:35
10	13.7	4:53	6:36
11	13.8	4:52	6:37
12	13.8	4:51	6:38
13	13.8	4:50	6:39
14	13.8	4:49	6:40
15	13.9	4:48	6:40
16	13.9	4:47	6:41
17	13.9	4:46	6:42
18	14.0	4:46	6:43
19	14.0	4:45	6:44
20	14.0	4:44	6:44
21	14.0	4:44	6:45
22	14.1	4:43	6:46
23	14.1	4:42	6:47
24	14.1	4:42	6:48
25	14.1	4:41	6:48
26	14.1	4:41	6:49
27	14.2	4:40	6:50
28	14.2	4:40	6:51
29	14.2	4:39	6:51
30	14.2	4:39	6:52
31	14.2	4:38	6:53

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.73 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.54 kWh/m² to a high of 5.73 kWh/m² in May across the year — May's 5.73 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)	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.8	5.7	5.7
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	5.7	Bright
2	5.7	Bright
3	5.7	Bright
4	5.7	Bright
5	5.7	Bright
6	5.7	Bright
7	5.7	Bright
8	5.7	Bright
9	5.7	Bright
10	5.7	Bright
11	5.7	Bright
12	5.7	Bright
13	5.7	Bright
14	5.7	Bright
15	5.7	Bright
16	5.7	Bright
17	5.8	Bright
18	5.8	Bright
19	5.8	Bright
20	5.8	Bright
21	5.8	Bright
22	5.8	Bright
23	5.8	Bright
24	5.8	Bright
25	5.8	Bright
26	5.8	Bright
27	5.8	Bright
28	5.8	Bright
29	5.8	Bright
30	5.7	Bright
31	5.7	Bright

Planning a trip in May

Is May a good time to visit Tatsuno?

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

5.7

Sightseeing

3rd-best month of the year

2.4

Beach & pool

5th-best month of the year

May is a reasonable time to visit Tatsuno for sightseeing.

What to pack for Tatsuno in May

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

In May, Tatsuno sees daytime highs around 19°C and nights near 9°C. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

UV index in Tatsuno in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tatsuno peaks around July 14 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	3	5	6	7	9	10	11	10	9	6	4	2
Level	Moderate	Moderate	High	Very high	Very high	Extreme	Extreme	Very high	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	3	Moderate
Feb	5	Moderate
Mar	6	High
Apr	7	Very high
May	9	Very high
Jun	10	Extreme
Jul	11	Extreme
Aug	10	Very high
Sep	9	Very high
Oct	6	High
Nov	4	Moderate
Dec	2	Moderate

Air quality in Tatsuno in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Tatsuno is worst in April — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	9	11	17	18	17	16	13	12	10	10	9	8
Level	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	9	Good
Feb	11	Good
Mar	17	Moderate
Apr	18	Moderate
May	17	Moderate
Jun	16	Moderate
Jul	13	Moderate
Aug	12	Good
Sep	10	Good
Oct	10	Good
Nov	9	Good
Dec	8	Good

Location & terrain

Where is Tatsuno?

Tatsuno sits at 36.0°N, 138.0°E, 726 m above sea level, in Japan. The nearest listed city is Okaya, 9.0 km away.

Topography around Tatsuno

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

Within 3 km, the terrain around Tatsuno has significant variations in elevation — a maximum elevation change of 561 m around an average of 851 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,650 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,012 m.

The land around Tatsuno is covered by trees (71%) within 3 km, trees (77%) within 16 km, and trees (88%) within 80 km.

3 km

561 m

trees 71%

16 km

1,650 m

trees 77%

80 km

3,012 m

trees 88%

treesgrasslandcroplandartificial surfaceswater

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

May weather nearby: Okaya 9.0 km · Kinoshita 9.0 km · Suwa 12 km · Shimosuwa 12 km · Minamiminowa 13 km · Shiojiri 13 km · Chino 14 km · Ina 18 km

Japan travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type A / B; 100 V · 50 / 60 Hz
Prices: ≈ 65% of US; price level, 2025
GDP per capita: $35,951; 2025
Happiness: 6.1 / 10; World Happiness, 2025
Safe drinking water: 99%; of population, 2024
Homicide rate: 0.2; per 100k, 2023
Road deaths: 3.6; per 100k/yr, 2019
Income group: High; World Bank
English: Very low; EF EPI 446
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 Tatsuno (35.9843°, 137.9972°, elevation 726 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. 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	17	6
2	17	6
3	17	6
4	17	7
5	17	7
6	18	7
7	18	7
8	18	7
9	18	8
10	18	8
11	18	8
12	18	8
13	19	8
14	19	8
15	19	9
16	19	9
17	19	9
18	19	9
19	19	9
20	19	9
21	20	9
22	20	10
23	20	10
24	20	10
25	20	10
26	20	10
27	20	10
28	20	11
29	20	11
30	21	11
31	21	11

	Clearer (%)	Cloudier (%)
1	44	56
2	44	56
3	44	56
4	44	56
5	43	57
6	43	57
7	42	58
8	41	59
9	40	60
10	40	60
11	40	60
12	41	59
13	39	61
14	39	61
15	40	60
16	40	60
17	39	61
18	39	61
19	39	61
20	39	61
21	38	62
22	38	62
23	38	62
24	37	63
25	36	64
26	36	64
27	35	65
28	33	67
29	33	67
30	32	68
31	31	69

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	98	2
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	97	3
11	97	3
12	97	3
13	97	3
14	97	3
15	97	3
16	97	3
17	97	3
18	96	4
19	96	4
20	96	4
21	96	4
22	96	4
23	95	5
24	95	5
25	95	5
26	95	5
27	94	6
28	94	6
29	94	6
30	93	7
31	92	8

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

	Clearer (%)	Cloudier (%)
1	44	56
2	44	56
3	44	56
4	44	56
5	43	57
6	43	57
7	42	58
8	41	59
9	40	60
10	40	60
11	40	60
12	41	59
13	39	61
14	39	61
15	40	60
16	40	60
17	39	61
18	39	61
19	39	61
20	39	61
21	38	62
22	38	62
23	38	62
24	37	63
25	36	64
26	36	64
27	35	65
28	33	67
29	33	67
30	32	68
31	31	69

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	98	2
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	97	3
11	97	3
12	97	3
13	97	3
14	97	3
15	97	3
16	97	3
17	97	3
18	96	4
19	96	4
20	96	4
21	96	4
22	96	4
23	95	5
24	95	5
25	95	5
26	95	5
27	94	6
28	94	6
29	94	6
30	93	7
31	92	8

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

	Clearer (%)	Cloudier (%)
1	44	56
2	44	56
3	44	56
4	44	56
5	43	57
6	43	57
7	42	58
8	41	59
9	40	60
10	40	60
11	40	60
12	41	59
13	39	61
14	39	61
15	40	60
16	40	60
17	39	61
18	39	61
19	39	61
20	39	61
21	38	62
22	38	62
23	38	62
24	37	63
25	36	64
26	36	64
27	35	65
28	33	67
29	33	67
30	32	68
31	31	69

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	98	2
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	97	3
11	97	3
12	97	3
13	97	3
14	97	3
15	97	3
16	97	3
17	97	3
18	96	4
19	96	4
20	96	4
21	96	4
22	96	4
23	95	5
24	95	5
25	95	5
26	95	5
27	94	6
28	94	6
29	94	6
30	93	7
31	92	8