Weather in Iwanuma

14-day forecast · updated today, Thursday, October 29, at 11:21 am (GMT+9)

Now · partly cloudy 60 °F

Feels like: 55 °F
Low / high: 43 / 61 °F
Rain: 0%
Wind: 8 mph SE

↘ 30.30 inHg · falling

Today in Iwanuma: overcast, 43 °F to 61 °F, with a 0% chance of rain and a gentle breeze from the southeast (8 mph). Tomorrow, overcast, 52 °F to 67 °F and a 22% chance of rain. The warmest day of the week is Friday 30, at 67 °F. Next likely rain: Saturday 31 (66%).

Measured now at the airport

Sendai (RJSS), 4.0 mi away · 42 min ago

Visibility6.2 mi or more

WeatherNothing to note

Temperature55 °F

Wind7 mph from the south-southeast

It's what the airport's weather station measured, not a forecast: on the coast, wind and fog can be different. Airports report every 30 or 60 minutes.

Airport METAR report, via NOAA's Aviation Weather Center (aviationweather.gov). Sources and licenses

Temperatures for the next 14 days

61° 43°
Today
67° 52°
Fri 30
67° 47°
Sat 31
60° 42°
Sun 1
62° 49°
Mon 2
63° 43°
Tue 3
60° 42°
Wed 4
59° 47°
Thu 5
63° 47°
Fri 6
53° 37°
Sat 7
56° 35°
Sun 8
53° 41°
Mon 9
53° 39°
Tue 10
53° 38°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	Model
Today · 29	Overcast	43 / 61 °F	0%	9 mph SSE	2.7 ft	ECMWF
Fri 30	Overcast	52 / 67 °F	22%	4 mph SW	4.9 ft	ECMWF
Sat 31	Light drizzle	47 / 67 °F	66% · 0.04 in	11 mph WSW	5.0 ft	ECMWF
Sun 1	Overcast	42 / 60 °F	8%	8 mph WSW	3.6 ft	ECMWF
Mon 2	Light drizzle	49 / 62 °F	53% · 0.05 in	7 mph SW	3.7 ft	ECMWF
Tue 3	Light drizzle	43 / 63 °F	33% · 0.11 in	9 mph WSW	4.3 ft	ECMWF
Wed 4	Overcast	42 / 60 °F	4%	8 mph SE	2.9 ft	ECMWF
Thu 5	Heavy drizzle	47 / 59 °F	47% · 0.31 in	3 mph NNW	6.2 ft	ECMWF
Fri 6	Light drizzle	47 / 63 °F	34% · 0.09 in	7 mph SW	6.2 ft	ECMWF
Sat 7	Partly cloudy	37 / 53 °F	19%	6 mph W	3.9 ft	ECMWF
Sun 8	Light drizzle	35 / 56 °F	19% · 0.01 in	9 mph S	3.0 ft	ECMWF
Mon 9	Light drizzle	41 / 53 °F	25% · 0.02 in	6 mph W	3.2 ft	ECMWF
Tue 10	Light drizzle	39 / 53 °F	26% · 0.08 in	9 mph SW	2.9 ft	ECMWF
Wed 11	Light drizzle	38 / 53 °F	20% · 0.02 in	7 mph SSW	2.0 ft	ECMWF

Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore.

Today, every 3 hours

Time	12:00 am	3:00 am	6:00 am	9:00 am	12:00 pm	3:00 pm	6:00 pm	9:00 pm
Sky	Partly cloudy	Mainly clear	Mainly clear	Clear sky	Partly cloudy	Overcast	Overcast	Overcast
Temperature	45°	46°	43°	54°	61°	59°	54°	53°
Chance of rain	0%	0%	0%	0%	0%	0%	0%	0%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in
Wind (mph)	5 SW	4 W	2 WSW	1 S	8 SE	9 SE	5 SE	2 S
Humidity	76%	76%	83%	61%	45%	58%	74%	78%
UV	0	0	0	2	2	0	0	0
Model	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF

Do the models agree?

Medium confidence

They broadly agree, but not quite on rain tomorrow: take it with some caution.

What 4 forecast models say for the next few days. The closer they are, the more reliable the forecast.

HighRainWind

Do the models agree? · High
High (°F)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	61°	67°	67°	60°	62°	63°	60°
AIFS	58°	62°	63°	58°	59°	59°	56°
GFS	58°	64°	67°	60°	53°	61°	58°
ICON	59°	61°	68°	60°	60°	61°	57°
Confidence	high	medium	high	high	medium	high	high

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0	0	0.04 in	0	0.05 in	0.11 in	0
AIFS	0	0.06 in	0.09 in	0.01 in	0.17 in	0.02 in	0.22 in
GFS	0	0	0.05 in	0	0.89 in	0	0
ICON	0	0.03 in	0	0	0	0	0
Confidence	high	medium	medium	high	medium	medium	medium

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	924	413	1126	820	719	919	821
AIFS	10	5	10	7	5	8	5
GFS	1517	513	1731	1628	812	1413	43
ICON	1525	47	1527	918	47	1322	59
Confidence	high	high	medium	medium	high	high	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	0%	22%	66%	8%	53%	33%	4%
GFS (GEFS, 31 scenarios)	2%	10%	42%	3%	61%	29%	6%

Each model's day runs midnight to midnight local time; models that reach fewer days are left blank. Rain: daily total. Wind: the day's highest average wind and, in small type, the strongest gust. Highlighted: values that stand out from the rest. The chance of rain comes from many runs of the same model with slightly different starting data.

Outlook

How the coming weeks and months compare with what is normal for the time of year. It is a trend, not a day-by-day forecast.

The next few weeks look normal for the time of year.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	A bit below −1.6 °F	Normal	A bit above +0.5 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	A bit below −0.9 °F	Normal	Normal 0.0 °F	—
Nov 16 – Nov 22Nov 16–Nov 22	Normal +0.5 °F	Normal	Normal −0.2 °F	55° / 49°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +1.3 °F	Normal	Normal −0.2 °F	53° / 47°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +1.4 °F	Normal	Normal −0.2 °F	51° / 44°

Coming months

When	TemperatureTemp.	Rain	Sea
November	Above +3.1 °F	A bit above +24%	Above +2.5 °F
December	Above +2.9 °F	A bit above +45%	Well above +4.0 °F
January	Above +3.4 °F	Normal	Well above +7.0 °F
February	Above +4.3 °F	A bit above +23%	Well above +8.6 °F
March	Above +4.0 °F	Normal	Well above +7.6 °F

Weeks: ECMWF 46-day (average of its scenarios), against the normal of the last 20 years for those dates. Months: ECMWF SEAS5. Rain: total against normal. The further ahead, the closer it gets to normal and the less detail it can give.

Iwanuma climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Iwanuma is from May to June and from August to September: highs of 69 °F to 82 °F, about 11 rainy days a month and 5 hours of sunshine a day.

Typhoon season: from July to October, peaking in August. In the last 30 years (1996–2025), 25 tropical cyclones passed within 93 mi of Iwanuma, about 8 every 10 years; 5 of them with hurricane-force winds (74 mph or more). The most recent: in July 2025.

43° 30°

JanJ
44° 31°

FebF
51° 36°

MarM
61° 44°

AprA
69° 54°

MayM
73° 62°

JunJ
80° 69°

JulJ
82° 72°

AugA
77° 65°

SepS
68° 54°

OctO
58° 42°

NovN
48° 33°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	43°	30°	1.67 in	13	4.6	52°	3.3 ft	–
FebruaryFeb	44°	31°	1.52 in	10	4.9	48°	3.4 ft	–
MarchMar	51°	36°	2.70 in	10	5.4	47°	3.5 ft	–
AprilApr	61°	44°	3.81 in	9	5.6	51°	3.6 ft	–
MayMay	69°	54°	3.85 in	9	5.7	56°	3.4 ft	–
JuneJun	73°	62°	5.18 in	11	4.5	64°	3.2 ft	2
JulyJul	80°	69°	6.61 in	15	3.8	70°	3.1 ft	3
AugustAug	82°	72°	6.06 in	13	4.9	75°	3.4 ft	10
SeptemberSep	77°	65°	6.76 in	12	3.9	73°	3.8 ft	7
OctoberOct	68°	54°	6.32 in	11	4.1	67°	3.8 ft	3
NovemberNov	58°	42°	2.39 in	12	3.7	62°	3.2 ft	–
DecemberDec	48°	33°	2.09 in	15	3.8	57°	3.2 ft	–

Month	Water	Waves	Cyclones
Jan	52°	3.3 ft	–
Feb	48°	3.4 ft	–
Mar	47°	3.5 ft	–
Apr	51°	3.6 ft	–
May	56°	3.4 ft	–
Jun	64°	3.2 ft	2
Jul	70°	3.1 ft	3
Aug	75°	3.4 ft	10
Sep	73°	3.8 ft	7
Oct	67°	3.8 ft	3
Nov	62°	3.2 ft	–
Dec	57°	3.2 ft	–

Days: rainy days in the month. Sun: hours a day.

A normal year brings 48.96 in of rain on about 140 days and about 1,650 hours of sunshine.

Cyclones: how many tropical cyclones (tropical storms, hurricanes and typhoons) passed within 93 mi in each month from 1996 to 2025, according to IBTrACS (NOAA).

1991–2020 averages. Highs, lows and rainfall: TerraClimate; rainy days (0.04 in or more): NASA POWER (MERRA-2); sunshine hours: estimated from solar radiation; water: NOAA OISST; waves (average height): ERA5, 2011–2020. Normals are not a forecast: any given year can turn out very different. Sources and licenses

Temperature

Now60 °Ffeels like 55 °F

Tomorrow52 / 67 °F

It's 60 °F now (feels like 55 °F). Today, 43 °F to 61 °F; tomorrow, 52 °F to 67 °F.

Chance of rain

Today 0%
Fri 30 22%
Sat 31 66% 0.04 in
Sun 1 8%
Mon 2 53% 0.05 in
Tue 3 33% 0.11 in
Wed 4 4%

Today the chance of rain reaches 0%. The next day with likely rain is Saturday 31: 66% and 0.04 in.

Recent rain: last 24 hours, 0.02 in; last 3 days, 0.11 in; last 7 days, 0.79 in.

Humidity and dew point

Humidity46%

Dew point39 °F

Humidity is 46% now and the dew point is 39 °F.

The dew point is the temperature at which the air becomes saturated: the higher it is, the heavier the air feels.

Visibility and fog

Now15 migood

Clouds53%

Visibility is good now (15 mi). No fog expected today.

The model gives visibility up to about 15 mi: beyond that, the horizon is clear.

UV index

Now3

Today's peak3moderate

Fri 30: 3 · Sat 31: 3 · Sun 1: 2

Index	Level	What to do
0–2	low	No special protection needed.
3–5	moderate	Hat, sunglasses and sunscreen around midday.
6–7	high	Sunscreen, hat and shade between 12 and 4 pm.
8–10	very high	Avoid the midday sun; reflection off the water adds to it.
11+	extreme	Avoid the sun between 11 am and 5 pm; protect yourself even if it is cloudy.

Reflection off water and sand adds radiation: protect yourself more on a boat or at the beach.

Barometric pressure

↗ Rising Anglers say fish bite less for a while
→ Steady Anglers expect normal activity
↘ Falling · now Anglers say fish feed more before the change

29.8030.0030.2030.40 29.77

Falling now (−0.05 inHg in 3 hours). Over the next 48 hours: −0.51 inHg. Falling pressure: anglers say fish feed more before the change. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityFair · 32

Saharan dustNo

Previous days

The weather over the last 30 days, as the models analyzed it. Tap a day to see it hour by hour.

Day	Sky	Low / high	Rain	Max wind
Wed 28	Light drizzle	45 / 55 °F	0.04 in	11 mph W
Tue 27	Light drizzle	54 / 67 °F	0.02 in	4 mph NE
Mon 26	Light drizzle	56 / 60 °F	0.11 in	6 mph NE
Sun 25	Heavy drizzle	59 / 66 °F	0.33 in	2 mph SW
Sat 24	Drizzle	50 / 65 °F	0.29 in	2 mph SW
Fri 23	Overcast	42 / 63 °F	0	6 mph SE
Thu 22	Light drizzle	47 / 63 °F	0.02 in	9 mph WNW

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Light drizzle	62 / 79 °F	0.11 in	9 mph SW
Tue 20	Rain	62 / 66 °F	0.55 in	7 mph SW
Mon 19	Light drizzle	57 / 75 °F	0.04 in	12 mph SW
Sun 18	Partly cloudy	44 / 66 °F	0	8 mph SE
Sat 17	Partly cloudy	49 / 71 °F	0	5 mph WSW
Fri 16	Overcast	54 / 75 °F	0	10 mph WSW
Thu 15	Overcast	49 / 71 °F	0	7 mph SW
Wed 14	Drizzle	56 / 74 °F	0.17 in	9 mph SW
Tue 13	Light drizzle	59 / 71 °F	0.06 in	9 mph ESE
Mon 12	Light drizzle	57 / 70 °F	0.04 in	8 mph NNE
Sun 11	Overcast	55 / 73 °F	0	5 mph E
Sat 10	Overcast	51 / 73 °F	0	6 mph SSW
Fri 9	Clear sky	50 / 71 °F	0	5 mph S
Thu 8	Partly cloudy	50 / 75 °F	0	5 mph WSW
Wed 7	Clear sky	52 / 74 °F	0	7 mph SW
Tue 6	Light drizzle	57 / 77 °F	0.01 in	6 mph N
Mon 5	Drizzle	55 / 69 °F	0.11 in	4 mph NNW
Sun 4	Overcast	53 / 65 °F	0	4 mph N
Sat 3	Overcast	51 / 72 °F	0	5 mph W
Fri 2	Light drizzle	55 / 73 °F	0.01 in	7 mph W
Thu 1	Partly cloudy	58 / 80 °F	0	6 mph WSW
Wed 30	Mainly clear	51 / 71 °F	0	6 mph ESE
Tue 29	Overcast	58 / 71 °F	0	10 mph WSW

These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.

Questions about the weather in IwanumaQuestions

What's the weather like today in Iwanuma?

Overcast, from 43 °F to 61 °F, with a gentle breeze from the southeast (8 mph) and a 0% chance of rain.

Will it rain tomorrow in Iwanuma?

On Friday 30 the chance of rain is 22% (0.00 in): overcast.

How warm will it be this week?

Between a low of 42 °F and a high of 67 °F; the warmest day, Friday 30.

What's the UV index today?

It reaches 3 (moderate). Hat, sunglasses and sunscreen around midday.

Is the pressure rising or falling?

It's 30.30 inHg and falling: +0.30 inHg over the last 24 hours.

When is the best time to visit Iwanuma?

The best time to visit Iwanuma is from May to June and from August to September: highs of 69 °F to 82 °F, about 11 rainy days a month and 5 hours of sunshine a day.

What is the weather like in Iwanuma in October?

In October, Iwanuma normally sees highs of 68 °F and lows of 54 °F, with about 11 rainy days (6.32 in for the month) and 4 hours of sunshine a day. The sea is around 67 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Iwanuma?

The warmest is August, with average highs of 82 °F, and the coldest January, with lows of 30 °F. The wettest is September (6.76 in) and the driest, February.

When is typhoon season in Iwanuma?

Typhoon season: from July to October, peaking in August. In the last 30 years (1996–2025), 25 tropical cyclones passed within 93 mi of Iwanuma, about 8 every 10 years; 5 of them with hurricane-force winds (74 mph or more). The most recent: in July 2025.

More about Iwanuma today

Weather near Iwanuma

Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.

Learn more

Weather: Open-Meteo, CC BY 4.0, with the best model for each spot and lead time (NOAA HRRR and NBM in the U.S., Météo-France AROME, DWD ICON-EU, ECMWF IFS and NOAA GFS); ECMWF grid point 9.4 mi away. The comparison also uses ICON (DWD), AIFS (ECMWF) and ARPEGE (Météo-France). Outlook: ECMWF 46-day and SEAS5. Chance of rain from ensemble models (ECMWF, GEFS and NBM). UV, air quality and pollen: CAMS (Copernicus).

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 11:21 am (local time).

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