Weather in Iwanai

14-day forecast · updated today, Thursday, October 29, at 11:12 am (GMT+9)

Now · overcast 50 °F

Feels like: 42 °F
Low / high: 42 / 51 °F
Rain: 100% · 0.61 in
Wind: 10 mph SSW

↘ 30.18 inHg · falling

Today in Iwanai: rain, 42 °F to 51 °F, with a 100% chance of rain (0.61 in) and a gentle breeze from the south-southwest (10 mph). Tomorrow, light drizzle, 46 °F to 61 °F and a 78% chance of rain. The warmest day of the week is Friday 30, at 61 °F.

Temperatures for the next 14 days

51° 42°
Today
61° 46°
Fri 30
56° 41°
Sat 31
43° 40°
Sun 1
46° 38°
Mon 2
44° 41°
Tue 3
43° 37°
Wed 4
56° 35°
Thu 5
50° 38°
Fri 6
38° 36°
Sat 7
39° 35°
Sun 8
37° 34°
Mon 9
38° 32°
Tue 10
39° 35°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Rain	42 / 51 °F	100% · 0.61 in	20 mph SW	10 ft	3:40 am · 7:10 pm	ECMWF
Fri 30	Light drizzle	46 / 61 °F	78% · 0.02 in	9 mph SSE	5.2 ft	4:15 am	ECMWF
Sat 31	Light rain	41 / 56 °F	100% · 0.51 in	24 mph W	8.8 ft	4:56 am	ECMWF
Sun 1	Drizzle	40 / 43 °F	100% · 0.31 in	24 mph WNW	10.0 ft	5:46 am	ECMWF
Mon 2	Light drizzle	38 / 46 °F	71% · 0.04 in	6 mph ESE	4.7 ft	7:02 am	ECMWF
Tue 3	Light rain	41 / 44 °F	88% · 0.44 in	18 mph WNW	4.6 ft	9:00 am	ECMWF
Wed 4	Light rain	37 / 43 °F	91% · 0.27 in	16 mph WNW	5.4 ft	12:47 am · 11:00 am	ECMWF
Thu 5	Drizzle	35 / 56 °F	32% · 0.04 in	9 mph ESE	3.4 ft	12:54 am · 12:45 pm	ECMWF
Fri 6	Light rain	38 / 50 °F	75% · 1.09 in	22 mph WNW	7.8 ft	1:06 am · 2:09 pm	ECMWF
Sat 7	Drizzle	36 / 38 °F	86% · 0.43 in	22 mph WNW	11 ft	1:19 am · 3:13 pm	ECMWF
Sun 8	Drizzle	35 / 39 °F	86% · 0.43 in	19 mph WNW	10 ft	1:35 am · 4:07 pm	ECMWF
Mon 9	Light drizzle	34 / 37 °F	72% · 0.18 in	15 mph WNW	6.0 ft	1:52 am · 4:54 pm	ECMWF
Tue 10	Snow	32 / 38 °F	58% · 0.46 in	15 mph NNW	7.3 ft	2:12 am · 5:37 pm	ECMWF
Wed 11	Drizzle	35 / 39 °F	51% · 0.26 in	18 mph W	7.9 ft	2:35 am · 6:19 pm	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. High tides: our own tide calculation.

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	Light drizzle	Light drizzle	Light drizzle	Light drizzle	Overcast	Light drizzle	Light rain	Rain
Temperature	42°	43°	44°	47°	51°	49°	48°	48°
Chance of rain	96%	82%	2%	4%	2%	63%	100%	100%
Rain	0.01 in	0.00 in	0.00 in	0.00 in	0.00 in	0.01 in	0.07 in	0.11 in
Wind (mph)	19 WNW	20 WNW	11 WNW	10 SW	10 SSW	10 S	10 SSE	10 SE
Humidity	63%	60%	59%	61%	54%	78%	85%	90%
UV	0	0	0	1	2	0	0	0
Model	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF

Do the models agree?

Low confidence

They don't agree on rain tomorrow: it may change, so check again closer to the day.

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	51°	61°	56°	43°	46°	44°	43°
AIFS	48°	58°	53°	42°	44°	44°	47°
GFS	49°	59°	53°	42°	45°	44°	43°
ICON	51°	63°	55°	42°	49°	46°	46°
Confidence	high	high	high	high	high	high	high

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0.61 in	0.02 in	0.51 in	0.31 in	0.04 in	0.44 in	0.27 in
AIFS	0.56 in	0.13 in	0.27 in	0.19 in	0.23 in	0.20 in	0.07 in
GFS	0.53 in	0.39 in	0.35 in	0.11 in	0.46 in	0.24 in	0.02 in
ICON	0.43 in	0	0.35 in	0.02 in	0.17 in	0.09 in	0
Confidence	high	low	high	medium	medium	medium	low

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	2039	920	2445	2445	633	1839	1633
AIFS	13	9	17	17	6	13	12
GFS	1728	715	2133	2440	1016	2030	2030
ICON	1739	819	2045	2148	615	1840	1945
Confidence	medium	high	medium	medium	high	high	medium

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	100%	78%	100%	100%	71%	88%	91%
GFS (GEFS, 31 scenarios)	100%	100%	95%	97%	73%	74%	55%

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.

Next few weeks, compared with normal: a bit cooler and normal rain.

Next 6 weeks

When	TemperatureTemp.	Rain	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Well below −5.4 °F	Normal	—
Nov 9 – Nov 15Nov 9–Nov 15	A bit below −2.0 °F	Normal	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit below −0.9 °F	Normal	40° / 34°
Nov 23 – Nov 29Nov 23–Nov 29	Normal +0.2 °F	Normal	37° / 31°
Nov 30 – Dec 6Nov 30–Dec 6	Normal 0.0 °F	Normal	34° / 29°

Coming months

When	TemperatureTemp.	Rain
November	Above +3.1 °F	Normal
December	A bit above +2.5 °F	Normal
January	Above +2.7 °F	A bit above +20%
February	Above +2.7 °F	Normal
March	A bit above +1.6 °F	Normal

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. The long-range sea temperature isn't usable at this spot (the model's grid cell falls on land).

Iwanai climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Iwanai is from July to August: highs of 72 °F to 74 °F, about 10 rainy days a month and 5 hours of sunshine a day.

Typhoon season: in September. In the last 30 years (1996–2025), 4 tropical cyclones passed within 93 mi of Iwanai, about one every 10 years; one of them with hurricane-force winds (74 mph or more). The most recent: Nabi, in September 2005.

28° 16°

JanJ
29° 17°

FebF
35° 22°

MarM
46° 32°

AprA
57° 42°

MayM
64° 50°

JunJ
72° 59°

JulJ
74° 61°

AugA
68° 53°

SepS
57° 42°

OctO
44° 31°

NovN
32° 21°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	28°	16°	5.96 in	21	1.5	46°	7.0 ft	–
FebruaryFeb	29°	17°	4.39 in	17	2.9	43°	6.3 ft	–
MarchMar	35°	22°	3.15 in	12	4.9	43°	5.0 ft	–
AprilApr	46°	32°	2.87 in	8	5.7	46°	4.0 ft	–
MayMay	57°	42°	2.88 in	8	5.9	51°	3.1 ft	–
JuneJun	64°	50°	3.29 in	8	5.5	58°	2.3 ft	–
JulyJul	72°	59°	5.51 in	9	4.5	66°	2.1 ft	–
AugustAug	74°	61°	5.52 in	11	5.0	71°	2.4 ft	–
SeptemberSep	68°	53°	5.65 in	12	5.2	70°	3.1 ft	3
OctoberOct	57°	42°	4.50 in	13	4.4	63°	5.1 ft	1
NovemberNov	44°	31°	5.77 in	17	2.1	55°	6.1 ft	–
DecemberDec	32°	21°	6.52 in	21	1.0	49°	7.5 ft	–

Month	Water	Waves	Cyclones
Jan	46°	7.0 ft	–
Feb	43°	6.3 ft	–
Mar	43°	5.0 ft	–
Apr	46°	4.0 ft	–
May	51°	3.1 ft	–
Jun	58°	2.3 ft	–
Jul	66°	2.1 ft	–
Aug	71°	2.4 ft	–
Sep	70°	3.1 ft	3
Oct	63°	5.1 ft	1
Nov	55°	6.1 ft	–
Dec	49°	7.5 ft	–

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

A normal year brings 56.00 in of rain on about 155 days and about 1,500 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

Now50 °Ffeels like 42 °F

Tomorrow46 / 61 °F

It's 50 °F now (feels like 42 °F). Today, 42 °F to 51 °F; tomorrow, 46 °F to 61 °F.

Chance of rain

Today 100% 0.61 in
Fri 30 78% 0.02 in
Sat 31 100% 0.51 in
Sun 1 100% 0.31 in
Mon 2 71% 0.04 in
Tue 3 88% 0.44 in
Wed 4 91% 0.27 in

Today the chance of rain reaches 100%, with 0.61 in in total. The next day with likely rain is Friday 30: 78% and 0.02 in.

Recent rain: last 24 hours, 0.19 in; last 3 days, 1.23 in; last 7 days, 1.44 in.

Humidity and dew point

Humidity54%

Dew point34 °F

Humidity is 54% now and the dew point is 34 °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

Clouds100%

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

Now2

Today's peak2low

Fri 30: 2 · Sat 31: 2 · 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

29.8030.0030.20 29.70

Falling now (−0.05 inHg in 3 hours). Over the next 48 hours: −0.47 inHg. Falling pressure: anglers say fish feed more before the change. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityFair · 29

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 rain	37 / 42 °F	0.78 in	28 mph WNW
Tue 27	Light rain	44 / 52 °F	0.41 in	21 mph WSW
Mon 26	Overcast	48 / 52 °F	0	18 mph NW
Sun 25	Light drizzle	53 / 59 °F	0.06 in	18 mph WNW
Sat 24	Overcast	47 / 61 °F	0	6 mph S
Fri 23	Overcast	50 / 56 °F	0	17 mph WSW
Thu 22	Light rain	44 / 51 °F	0.82 in	22 mph WNW

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Light rain	50 / 64 °F	0.84 in	20 mph NW
Tue 20	Light drizzle	52 / 59 °F	0.00 in	9 mph WNW
Mon 19	Rain	57 / 63 °F	0.74 in	18 mph WSW
Sun 18	Light drizzle	46 / 61 °F	0.01 in	11 mph ESE
Sat 17	Light drizzle	53 / 56 °F	0.05 in	22 mph NW
Fri 16	Light rain	53 / 58 °F	0.29 in	20 mph W
Thu 15	Drizzle	52 / 58 °F	0.11 in	23 mph W
Wed 14	Heavy drizzle	54 / 66 °F	0.56 in	22 mph WSW
Tue 13	Light drizzle	57 / 70 °F	0.01 in	12 mph SE
Mon 12	Overcast	57 / 64 °F	0	6 mph ENE
Sun 11	Light drizzle	59 / 65 °F	0.01 in	6 mph WNW
Sat 10	Overcast	55 / 66 °F	0	7 mph WSW
Fri 9	Drizzle	59 / 65 °F	0.30 in	15 mph SW
Thu 8	Light drizzle	62 / 66 °F	0.04 in	20 mph W
Wed 7	Partly cloudy	57 / 64 °F	0	17 mph WNW
Tue 6	Rain	58 / 64 °F	0.41 in	14 mph W
Mon 5	Rain	52 / 67 °F	0.87 in	12 mph ESE
Sun 4	Overcast	54 / 62 °F	0	8 mph WNW
Sat 3	Drizzle	54 / 58 °F	0.13 in	13 mph WNW
Fri 2	Heavy drizzle	54 / 58 °F	0.50 in	23 mph W
Thu 1	Rain	60 / 63 °F	0.52 in	23 mph WSW
Wed 30	Overcast	56 / 67 °F	0	6 mph E
Tue 29	Light rain	60 / 64 °F	0.33 in	24 mph WNW

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 IwanaiQuestions

What's the weather like today in Iwanai?

Rain, from 42 °F to 51 °F, with a gentle breeze from the south-southwest (10 mph) and a 100% chance of rain.

Will it rain tomorrow in Iwanai?

On Friday 30 the chance of rain is 78% (0.02 in): light drizzle.

How warm will it be this week?

Between a low of 37 °F and a high of 61 °F; the warmest day, Friday 30.

What's the UV index today?

It reaches 2 (low). No special protection needed.

Is the pressure rising or falling?

It's 30.18 inHg and falling: +0.35 inHg over the last 24 hours.

When is the best time to visit Iwanai?

The best time to visit Iwanai is from July to August: highs of 72 °F to 74 °F, about 10 rainy days a month and 5 hours of sunshine a day.

What is the weather like in Iwanai in October?

In October, Iwanai normally sees highs of 57 °F and lows of 42 °F, with about 13 rainy days (4.50 in for the month) and 4 hours of sunshine a day. The sea is around 63 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Iwanai?

The warmest is August, with average highs of 74 °F, and the coldest January, with lows of 16 °F. The wettest is December (6.52 in) and the driest, April.

When is typhoon season in Iwanai?

Typhoon season: in September. In the last 30 years (1996–2025), 4 tropical cyclones passed within 93 mi of Iwanai, about one every 10 years; one of them with hurricane-force winds (74 mph or more). The most recent: Nabi, in September 2005.

More about Iwanai today

Weather near Iwanai

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 1.8 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 11:12 am (local time).

Spotted a mistake? Tell us · Where the weather and sea data come from