Weather in Kosai

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

Now · overcast 61 °F

Feels like: 61 °F
Low / high: 50 / 69 °F
Rain: 10%
Wind: 5 mph NE

→ 30.23 inHg · steady

Today in Kosai: overcast, 50 °F to 69 °F, with a 10% chance of rain and a light breeze from the northeast (5 mph). Tomorrow, heavy drizzle, 60 °F to 70 °F and a 69% chance of rain. The warmest day of the week is Friday 30, at 70 °F.

Temperatures for the next 14 days

69° 50°
Today
70° 60°
Fri 30
69° 56°
Sat 31
65° 51°
Sun 1
67° 49°
Mon 2
69° 57°
Tue 3
65° 51°
Wed 4
69° 60°
Thu 5
69° 56°
Fri 6
64° 49°
Sat 7
63° 48°
Sun 8
64° 47°
Mon 9
61° 47°
Tue 10
56° 44°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Overcast	50 / 69 °F	10%	8 mph E	2.5 ft	8:11 am · 6:54 pm	ECMWF
Fri 30	Heavy drizzle	60 / 70 °F	69% · 0.17 in	7 mph NNE	3.2 ft	9:06 am · 7:32 pm	ECMWF
Sat 31	Light drizzle	56 / 69 °F	47% · 0.00 in	14 mph WNW	3.3 ft	10:13 am · 8:20 pm	ECMWF
Sun 1	Overcast	51 / 65 °F	0%	11 mph WNW	4.9 ft	11:42 am · 9:35 pm	ECMWF
Mon 2	Light rain	49 / 67 °F	82% · 0.40 in	9 mph NNE	5.0 ft	1:17 pm · 11:30 pm	ECMWF
Tue 3	Overcast	57 / 69 °F	25%	13 mph WNW	4.9 ft	2:15 pm	ECMWF
Wed 4	Overcast	51 / 65 °F	20%	7 mph NNE	4.0 ft	1:22 am · 2:52 pm	ECMWF
Thu 5	Drizzle	60 / 69 °F	71% · 0.15 in	5 mph NW	5.4 ft	2:50 am · 3:22 pm	ECMWF
Fri 6	Heavy drizzle	56 / 69 °F	42% · 0.37 in	15 mph WNW	5.6 ft	3:54 am · 3:49 pm	ECMWF
Sat 7	Partly cloudy	49 / 64 °F	4%	10 mph NW	7.4 ft	4:45 am · 4:14 pm	ECMWF
Sun 8	Overcast	48 / 63 °F	6%	13 mph NW	5.8 ft	5:29 am · 4:40 pm	ECMWF
Mon 9	Overcast	47 / 64 °F	18%	4 mph NW	6.0 ft	6:10 am · 5:05 pm	ECMWF
Tue 10	Clear sky	47 / 61 °F	20%	14 mph WNW	7.8 ft	6:48 am · 5:30 pm	ECMWF
Wed 11	Clear sky	44 / 56 °F	12%	15 mph NW	7.7 ft	7:25 am · 5:55 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	Clear	Overcast	Clear	Mainly clear	Mainly clear	Clear sky	Overcast	Overcast
Temperature	50°	54°	53°	64°	69°	68°	64°	61°
Chance of rain	0%	0%	0%	0%	2%	10%	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 NW	4 NW	1 ENE	1 E	8 SE	4 SSE	4 ESE	5 NE
Humidity	61%	59%	70%	64%	58%	65%	77%	82%
UV	0	0	0	2	4	1	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	69°	70°	69°	65°	67°	69°	65°
AIFS	69°	67°	71°	68°	63°	70°	67°
GFS	70°	71°	72°	71°	70°	72°	71°
ICON	69°	69°	69°	69°	71°	71°	62°
Confidence	high	high	high	medium	medium	high	medium

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0	0.17 in	0.00 in	0	0.40 in	0	0
AIFS	0	0.36 in	0.18 in	0	0.38 in	0	0.03 in
GFS	0	0.33 in	0	0	0.15 in	0	0
ICON	0	0.02 in	0.03 in	0	0.01 in	0	0.10 in
Confidence	high	medium	medium	high	medium	high	medium

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	820	714	1433	1124	921	1329	726
AIFS	10	6	17	11	9	10	7
GFS	812	812	2033	1325	1634	1534	66
ICON	411	49	1634	716	511	1123	817
Confidence	high	high	high	high	medium	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)	10%	69%	47%	0%	82%	25%	20%
GFS (GEFS, 31 scenarios)	0%	94%	61%	0%	81%	16%	10%

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	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Normal +0.5 °F	Normal	—
Nov 9 – Nov 15Nov 9–Nov 15	Normal −0.5 °F	Normal	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +1.1 °F	Normal	61° / 49°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.2 °F	A bit above +22%	60° / 48°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +2.3 °F	A bit above +32%	57° / 46°

Coming months

When	TemperatureTemp.	Rain
November	Above +2.7 °F	A bit above +29%
December	A bit above +2.5 °F	Above +59%
January	A bit above +2.5 °F	A bit above +22%
February	Above +3.2 °F	A bit above +24%
March	Above +2.7 °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).

Kosai climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Kosai is in May and from August to October: highs of 73 °F to 87 °F, about 11 rainy days a month and 6 hours of sunshine a day.

Typhoon season: from July to October, peaking in September. In the last 30 years (1996–2025), 36 tropical cyclones passed within 93 mi of Kosai, one or two a year; 15 of them with hurricane-force winds (74 mph or more). The most recent: Peipah, in September 2025.

49° 35°

JanJ
51° 36°

FebF
57° 41°

MarM
66° 50°

AprA
73° 58°

MayM
78° 66°

JunJ
85° 73°

JulJ
87° 75°

AugA
82° 69°

SepS
73° 60°

OctO
64° 49°

NovN
54° 39°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	49°	35°	2.46 in	5	6.1	61°	3.7 ft	–
FebruaryFeb	51°	36°	3.28 in	6	6.2	60°	4.0 ft	–
MarchMar	57°	41°	5.20 in	9	6.5	60°	4.0 ft	–
AprilApr	66°	50°	6.65 in	9	6.7	63°	4.0 ft	–
MayMay	73°	58°	7.47 in	10	6.4	67°	3.5 ft	–
JuneJun	78°	66°	9.47 in	13	5.0	71°	3.7 ft	4
JulyJul	85°	73°	8.89 in	14	6.0	77°	3.9 ft	8
AugustAug	87°	75°	6.35 in	12	7.3	80°	4.3 ft	5
SeptemberSep	82°	69°	7.76 in	13	5.3	78°	4.5 ft	12
OctoberOct	73°	60°	9.09 in	10	4.8	74°	4.6 ft	7
NovemberNov	64°	49°	4.62 in	6	5.0	69°	3.6 ft	–
DecemberDec	54°	39°	2.81 in	6	5.4	65°	3.7 ft	–

Month	Water	Waves	Cyclones
Jan	61°	3.7 ft	–
Feb	60°	4.0 ft	–
Mar	60°	4.0 ft	–
Apr	63°	4.0 ft	–
May	67°	3.5 ft	–
Jun	71°	3.7 ft	4
Jul	77°	3.9 ft	8
Aug	80°	4.3 ft	5
Sep	78°	4.5 ft	12
Oct	74°	4.6 ft	7
Nov	69°	3.6 ft	–
Dec	65°	3.7 ft	–

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

A normal year brings 74.07 in of rain on about 111 days and about 2,150 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

Now61 °Ffeels like 61 °F

Tomorrow60 / 70 °F

It's 61 °F now (feels like 61 °F). Today, 50 °F to 69 °F; tomorrow, 60 °F to 70 °F.

Chance of rain

Today 10%
Fri 30 69% 0.17 in
Sat 31 47% 0.00 in
Sun 1 0%
Mon 2 82% 0.40 in
Tue 3 25%
Wed 4 20%

Today the chance of rain reaches 10%. The next day with likely rain is Friday 30: 69% and 0.17 in.

Recent rain: last 24 hours, 0.00 in; last 3 days, 0.26 in; last 7 days, 3.52 in.

Humidity and dew point

Humidity82%

Dew point56 °F

Humidity is 82% now and the dew point is 56 °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

Clouds94%

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

Now0

Today's peak4moderate

Fri 30: 4 · Sat 31: 4 · Sun 1: 3

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 · now Anglers expect normal activity
↘ Falling Anglers say fish feed more before the change

30.0030.20 29.88

Steady now (+0.00 inHg in 3 hours). Over the next 48 hours: −0.19 inHg. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityFair · 28

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	Clear sky	51 / 67 °F	0	15 mph NW
Tue 27	Light rain	64 / 77 °F	0.24 in	14 mph WNW
Mon 26	Rain	67 / 70 °F	1.54 in	10 mph ENE
Sun 25	Light rain	67 / 75 °F	0.65 in	7 mph WNW
Sat 24	Rain	64 / 72 °F	1.09 in	13 mph ENE
Fri 23	Overcast	61 / 73 °F	0	10 mph E
Thu 22	Overcast	62 / 75 °F	0	13 mph NW

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Drizzle	71 / 82 °F	0.13 in	13 mph WSW
Tue 20	Light rain	68 / 77 °F	0.56 in	6 mph E
Mon 19	Drizzle	65 / 80 °F	0.07 in	7 mph ENE
Sun 18	Overcast	60 / 76 °F	0	11 mph E
Sat 17	Partly cloudy	57 / 79 °F	0	9 mph SE
Fri 16	Overcast	57 / 81 °F	0	9 mph NW
Thu 15	Overcast	57 / 76 °F	0	13 mph W
Wed 14	Light rain	65 / 78 °F	0.47 in	13 mph NW
Tue 13	Mainly clear	63 / 79 °F	0	8 mph SSE
Mon 12	Mainly clear	60 / 81 °F	0	6 mph SSE
Sun 11	Clear sky	59 / 80 °F	0	5 mph E
Sat 10	Clear sky	64 / 78 °F	0	5 mph E
Fri 9	Overcast	61 / 80 °F	0	6 mph E
Thu 8	Clear sky	58 / 78 °F	0	6 mph ENE
Wed 7	Drizzle	62 / 75 °F	0.12 in	11 mph NW
Tue 6	Overcast	66 / 82 °F	0	14 mph WNW
Mon 5	Light drizzle	65 / 77 °F	0.04 in	5 mph N
Sun 4	Light drizzle	65 / 76 °F	0.01 in	10 mph E
Sat 3	Light drizzle	66 / 78 °F	0.02 in	8 mph E
Fri 2	Light drizzle	67 / 80 °F	0.01 in	11 mph WNW
Thu 1	Overcast	68 / 83 °F	0	11 mph WNW
Wed 30	Rain	66 / 80 °F	0.48 in	6 mph ENE
Tue 29	Rain	68 / 73 °F	1.71 in	5 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 KosaiQuestions

What's the weather like today in Kosai?

Overcast, from 50 °F to 69 °F, with a light breeze from the northeast (5 mph) and a 10% chance of rain.

Will it rain tomorrow in Kosai?

On Friday 30 the chance of rain is 69% (0.17 in): heavy drizzle.

How warm will it be this week?

Between a low of 49 °F and a high of 70 °F; the warmest day, Friday 30.

What's the UV index today?

It reaches 4 (moderate). Hat, sunglasses and sunscreen around midday.

Is the pressure rising or falling?

It's 30.23 inHg and steady: +0.04 inHg over the last 24 hours.

When is the best time to visit Kosai?

The best time to visit Kosai is in May and from August to October: highs of 73 °F to 87 °F, about 11 rainy days a month and 6 hours of sunshine a day.

What is the weather like in Kosai in October?

In October, Kosai normally sees highs of 73 °F and lows of 60 °F, with about 10 rainy days (9.09 in for the month) and 5 hours of sunshine a day. The sea is around 74 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Kosai?

The warmest is August, with average highs of 87 °F, and the coldest January, with lows of 35 °F. The wettest is June (9.47 in) and the driest, January.

When is typhoon season in Kosai?

Typhoon season: from July to October, peaking in September. In the last 30 years (1996–2025), 36 tropical cyclones passed within 93 mi of Kosai, one or two a year; 15 of them with hurricane-force winds (74 mph or more). The most recent: Peipah, in September 2025.

More about Kosai today

Weather near Kosai

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 3.6 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 9:11 pm (local time).

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