Iruma weather in February

In February, Iruma sees average daytime highs of 8°C and overnight lows near -1°C, with 75 mm of precipitation across 9.6 wet days and about 10.6 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 7°C in the first days to 9°C by the end. The sky is clear or mostly clear about 43% of the time in February, and the air most often feels dry.

Daylight stretches from about 10 h 12 min at the start of February to 11 h 06 min by month's end. Set against the rest of the year, February is Iruma's 3rd-clearest and 3rd-windiest month. For the whole year in context, see Iruma's year-round climate.

Daytime high
11th warmest
Overnight low
-1°
2nd coldest
Precipitation
75 mm
9.6 wet days
Daylight
10 h 36 min
6:38 AM – 5:17 PM
Cloud cover
51%
3rd clearest
Wind
7 km/h
3rd windiest
Solar energy
3.53 kWh/m²
Travel score
1.2
out of 10

Temperature in February

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 7°C in the first days to 9°C by the end.

A typical February day in Iruma reaches about 8°C in the afternoon and slips back to -1°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 4°C and 12°C. Set against its neighbours, February runs about 1°C warmer than January and about 3°C cooler than March.

-10°-5°10°15°151015202528
Avg high (°C)Avg low (°C)
17-2
27-2
37-2
47-2
57-2
67-2
77-2
87-2
97-2
107-2
117-2
127-2
138-1
148-1
158-1
168-1
178-1
188-1
198-1
208-1
218-1
228-1
2380
2490
2590
2690
2790
2890

How February really feels in Iruma

Once humidity and wind are folded in, February averages 0 days that feel above 32°C and 28 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
28
wind chill below the day's low

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

Iruma weather by month

How February compares with the rest of the year at a glance. February is the 11th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°778.54.49.81.0
Feb / -1°759.64.610.61.2
Mar11° / 13915.24.711.72.5
Apr16° / 14614.60.912.94.5
May21° / 13°16615.6013.95.5
Jun23° / 17°22219.5014.44.9
Jul27° / 21°24321.8014.24.5
Aug28° / 22°20521013.44.4
Sep25° / 18°24918.3012.25.2
Oct19° / 13°24216.2011.15.2
Nov14° / 10111.30.210.14.1
Dec10° / 688.31.49.62.2

Cloud cover in February

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in February.

Beyond those clear spells, partly cloudy skies cover about 17% of February, with mostly cloudy or overcast conditions the remaining 40%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202528
Clearer (%)Cloudier (%)
16931
26931
36832
46832
56733
66733
76634
86535
96436
106337
116238
126139
136139
146040
156040
165941
175941
185842
195743
205644
215545
225545
235446
245347
255347
265248
275248
285149

Chance of precipitation in February

Any precipitationSnow

Iruma gets around 75 mm of rain and snow over 9.6 wet days in February. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 36% and peaks near 44% on the wettest days, and about 5 days bring snow. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202528
Rain chance (%)Snow chance (%)
12715
22815
32815
42815
52915
63015
73016
83116
93216
103317
113417
123517
133518
143618
153718
163718
173718
183818
193818
203918
213918
224018
234118
244118
254218
264318
274418
284418

Humidity in February

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, February lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202528
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100

Wind in February

Winds average 7 km/h in February.

Across February, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202528
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm

Sunrise & sunset in February

DaylightNight

Daylight runs from about 10 h 12 min at the start of February to 11 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over February. Sunrise moves from 6:50 AM to 6:23 AM, and sunset from 5:02 PM to 5:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202528
Daylight (h)Sunrise (AM)Sunset (PM)
110.26:505:02
210.26:495:03
310.36:485:04
410.36:485:05
510.36:475:06
610.46:465:07
710.46:455:08
810.46:445:09
910.56:435:11
1010.56:435:12
1110.56:425:13
1210.56:415:14
1310.66:405:15
1410.66:395:16
1510.66:385:17
1610.76:375:18
1710.76:365:19
1810.86:345:20
1910.86:335:21
2010.86:325:22
2110.96:315:23
2210.96:305:24
2310.96:295:25
2411.06:285:25
2511.06:265:26
2611.06:255:27
2711.16:245:28
2811.16:235:29

Solar energy in February

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in February, about 3.53 kWh/m².

For context, solar energy here swings from a low near 2.39 kWh/m² to a high of 5.06 kWh/m² in May across the year — February's 3.53 kWh/m² falls in the middle.

01234151015202528
Solar energy (kWh/m²)Level
13.2Moderate
23.3Moderate
33.3Moderate
43.3Moderate
53.3Moderate
63.4Moderate
73.4Moderate
83.4Moderate
93.4Moderate
103.4Moderate
113.5Moderate
123.5Moderate
133.5Moderate
143.5Moderate
153.5Moderate
163.5Moderate
173.6Moderate
183.6Moderate
193.6Moderate
203.6Moderate
213.6Moderate
223.6Moderate
233.7Moderate
243.7Moderate
253.7Moderate
263.7Moderate
273.7Moderate
283.7Moderate
Planning a trip in February

Hazard calendar for Iruma

In seasonPeak

In February, Iruma sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Iruma sits in the Pacific typhoon belt; the season peaks July–October.

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

Is February a good time to visit Iruma?

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

1.2
Sightseeing
11th-best month of the year
0.0
Beach & pool
10th-best month of the year

February is a weaker month for outdoor sightseeing in Iruma.

What to pack for Iruma in February

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

In February, Iruma sees daytime highs around 8°C and nights near -1°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Iruma in February

The nearest coast averages about 13°C in February — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 51 km away) is warmest in August at about 26°C and coldest in February near 13°C.

It's comfortable for a long swim from Jun 7 to Nov 3 — about 4.9 months when the water holds above 20°C.

10°15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar13Bracing
Apr15Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug26Warm
Sep25Warm
Oct22Refreshing
Nov19Cool
Dec16Cool

UV index in Iruma in February

LowModerateHighVery highExtreme

Clear-sky midday UV in February 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 Iruma 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 Iruma in February

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Iruma is worst in April — around 26 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (December, 14 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1426 µg/m³Dec 1814 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb21Moderate
Mar25Moderate
Apr26Moderate
May24Moderate
Jun20Moderate
Jul17Moderate
Aug16Moderate
Sep16Moderate
Oct16Moderate
Nov16Moderate
Dec14Moderate
Location & terrain

Where is Iruma?

Iruma sits at 35.8°N, 139.4°E, 126 m above sea level, in Japan. The nearest listed city is Sayama, 6.0 km away.

Topography around Iruma

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

Within 3 km, the terrain around Iruma has only modest variations in elevation — a maximum elevation change of 140 m around an average of 124 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 725 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,737 m.

The land around Iruma is covered by artificial surfaces (53%) and trees (36%) within 3 km, artificial surfaces (49%) and trees (39%) within 16 km, and trees (46%) and artificial surfaces (28%) within 80 km.

3 km
140 m
16 km
725 m
80 km
3,737 m
treesgrasslandcroplandartificial surfaceswater
February weather nearby: Sayama 6.0 km · Hakonegasaki 6.0 km · Hannō 6.0 km · Hamura 8.0 km · Yokota 8.0 km · Higashiyamato 9.0 km · Tokorozawa 9.0 km · Fussa 10 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 Iruma (35.818°, 139.368°, elevation 126 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).