Chichibu weather in May

In May, Chichibu sees average daytime highs of 20°C and overnight lows near 11°C, with 195 mm of rain across 17.2 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 19°C in the first days to 21°C by the end. The sky is clear or mostly clear about 20% 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 Chichibu's 8th-clearest and 7th-windiest month. For the whole year in context, see Chichibu's year-round climate.

Daytime high
20°
5th warmest
Overnight low
11°
8th coldest
Rainfall
195 mm
17.2 wet days
Daylight
13 h 54 min
4:43 AM – 6:37 PM
Cloud cover
70%
8th clearest
Wind
6 km/h
7th windiest
Solar energy
5.21 kWh/m²
Travel score
5.2
out of 10

Chichibu is city in Saitama prefecture, Japan.

Density
106/km²
people per km²
Founded
2005

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 19°C in the first days to 21°C by the end.

A typical May day in Chichibu reaches about 20°C in the afternoon and slips back to 11°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 25°C. Set against its neighbours, May runs about 4°C warmer than April and about 2°C cooler than June.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
1199
2199
3199
41910
51910
61910
71910
81910
92010
102010
112011
122011
132011
142011
152011
162011
172012
182012
192012
202112
212112
222112
232112
242113
252113
262113
272113
282113
292113
302113
312113

How May really feels in Chichibu

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
0
heat index over the day's high
Days feeling ≤ C
0
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.

Chichibu 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.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°718.35.49.80.6
Feb / -2°739.75.710.60.9
Mar11° / 13815.25.911.72.2
Apr16° / 15715.21.212.94.3
May20° / 11°19517.2013.95.2
Jun23° / 16°26622.2014.44.5
Jul26° / 20°31825.1014.24.2
Aug27° / 21°26724.7013.44.3
Sep23° / 17°28121.2012.24.8
Oct18° / 11°24817.6011.14.8
Nov14° / 9310.70.310.13.9
Dec / 648.32.39.61.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% 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 65%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24357
34258
44258
54159
64060
73961
83862
93763
103664
113565
123565
133565
143565
153466
163466
173466
183466
193367
203367
213367
223367
233367
243268
253268
263268
273070
282971
292971
302773
312773

Chance of precipitation in May

Any precipitation

Chichibu gets around 195 mm of rain over 17.2 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 55% and peaks near 62% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
147
247
347
448
548
649
750
851
951
1052
1153
1253
1354
1454
1555
1655
1756
1856
1957
2057
2158
2258
2358
2459
2559
2660
2760
2860
2961
3061
3162

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 77% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19271
29271
39181
49091
59091
689101
789101
887112
987112
1086122
1186122
1285132
1385132
1483143
1583143
1682153
1781163
1879174
1977194
2076204
2173225
2272235
2370255
2467276
2565296
2664306
2761327
2859347
2956368
3053389
31504010

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 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

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 4:58 AM to 4:34 AM, and sunset from 6:24 PM to 6:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.44:586:24
213.54:566:25
313.54:556:26
413.54:546:27
513.64:536:28
613.64:526:29
713.64:516:29
813.74:506:30
913.74:496:31
1013.74:486:32
1113.84:476:33
1213.84:466:34
1313.84:456:34
1413.84:456:35
1513.94:446:36
1613.94:436:37
1713.94:426:38
1814.04:416:39
1914.04:416:39
2014.04:406:40
2114.04:396:41
2214.14:396:42
2314.14:386:43
2414.14:376:43
2514.14:376:44
2614.14:366:45
2714.24:366:45
2814.24:356:46
2914.24:356:47
3014.24:346:48
3114.24:346:48

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.21 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 2.49 kWh/m² to a high of 5.21 kWh/m² in May across the year — May's 5.21 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.3Bright
35.3Bright
45.3Bright
55.3Bright
65.2Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.2Bright
155.2Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.3Bright
215.3Bright
225.3Bright
235.3Bright
245.3Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.2Bright
305.2Bright
315.1Bright
Planning a trip in May

Hazard calendar for Chichibu

In seasonPeak

In May, Chichibu sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Chichibu's rainy season runs April–October, when most of the year's rain falls.

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

Is May a good time to visit Chichibu?

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

5.2
Sightseeing
1st-best month of the year
2.7
Beach & pool
5th-best month of the year

May is a reasonable time to visit Chichibu for sightseeing.

What to pack for Chichibu in May

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

In May, Chichibu sees daytime highs around 20°C and nights near 11°C. Pack rain gear. Worth having: sun protection. About 17 days see rain.

rain gearsun protection

UV index in Chichibu in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Chichibu peaks around July 15 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 15UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep8Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Chichibu 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 Chichibu is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug14Moderate
Sep13Moderate
Oct12Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Chichibu?

Chichibu sits at 36.0°N, 139.1°E, 236 m above sea level, in Japan. The nearest listed city is Yorii, 18 km away.

Topography around Chichibu

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

Within 3 km, the terrain around Chichibu has significant variations in elevation — a maximum elevation change of 424 m around an average of 280 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,713 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,737 m.

The land around Chichibu is covered by trees (56%) and artificial surfaces (33%) within 3 km, trees (92%) within 16 km, and trees (61%) and artificial surfaces (24%) within 80 km.

3 km
424 m
16 km
1,713 m
80 km
3,737 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Yorii 18 km · Ogawamachi 18 km · Morohongō 21 km · Kodamachō-kodamaminami 22 km · Ranzan 23 km · Hannō 27 km · Hidaka 27 km · Ōme 27 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
Shintoism 49%Buddhism 46%other 4%Christianity 1%

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 Chichibu (35.9903°, 139.0764°, elevation 236 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).