Weather in Seirō

14-day forecast · updated today, Thursday, October 29, at 11:41 am (GMT+9)

Now · mainly clear 60 °F

Feels like: 58 °F
Low / high: 48 / 61 °F
Rain: 22%
Wind: 1 mph NE

↘ 30.24 inHg · falling

Today in Seirō: overcast, 48 °F to 61 °F, with a 22% chance of rain and a light air from the northeast (1 mph). Tomorrow, light drizzle, 56 °F to 69 °F and a 82% chance of rain. The warmest day of the week is Friday 30, at 69 °F.

Measured now at the airport

Niigata (RJSN), 7.5 mi away · 41 min ago

Visibility6.2 mi or more

WeatherNothing to note

Temperature59 °F

Wind5 mph from the east-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° 48°
Today
69° 56°
Fri 30
62° 55°
Sat 31
57° 52°
Sun 1
59° 52°
Mon 2
59° 50°
Tue 3
60° 48°
Wed 4
65° 53°
Thu 5
59° 52°
Fri 6
51° 44°
Sat 7
60° 43°
Sun 8
50° 43°
Mon 9
52° 43°
Tue 10
52° 45°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Overcast	48 / 61 °F	22%	9 mph SSW	7.8 ft	3:03 am · 6:41 pm	ECMWF
Fri 30	Light drizzle	56 / 69 °F	82% · 0.01 in	7 mph S	2.2 ft	3:44 am	ECMWF
Sat 31	Light rain	55 / 62 °F	100% · 0.84 in	18 mph W	6.0 ft	4:30 am	ECMWF
Sun 1	Overcast	52 / 57 °F	18%	15 mph NW	5.6 ft	5:26 am	ECMWF
Mon 2	Light rain	52 / 59 °F	82% · 0.45 in	11 mph S	3.6 ft	6:42 am	ECMWF
Tue 3	Drizzle	50 / 59 °F	71% · 0.16 in	16 mph NW	4.5 ft	8:27 am · 11:59 pm	ECMWF
Wed 4	Light drizzle	48 / 60 °F	31% · 0.05 in	10 mph E	3.3 ft	10:09 am	ECMWF
Thu 5	Overcast	53 / 65 °F	33%	7 mph SSE	3.0 ft	12:02 am · 11:42 am	ECMWF
Fri 6	Heavy drizzle	52 / 59 °F	66% · 0.35 in	20 mph WNW	7.1 ft	12:15 am · 1:07 pm	ECMWF
Sat 7	Light drizzle	44 / 51 °F	68% · 0.05 in	14 mph NNW	7.3 ft	12:31 am · 2:17 pm	ECMWF
Sun 8	Light rain	43 / 60 °F	59% · 0.31 in	15 mph SSW	5.8 ft	12:50 am · 3:18 pm	ECMWF
Mon 9	Light rain	43 / 50 °F	57% · 0.56 in	13 mph NW	7.7 ft	1:12 am · 4:11 pm	ECMWF
Tue 10	Drizzle	43 / 52 °F	57% · 0.29 in	17 mph WNW	8.8 ft	1:36 am · 5:01 pm	ECMWF
Wed 11	Drizzle	45 / 52 °F	57% · 0.31 in	12 mph SW	8.2 ft	2:02 am · 5:50 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	Partly cloudy	Overcast	Clear	Clear sky	Mainly clear	Overcast	Overcast	Overcast
Temperature	53°	52°	48°	56°	60°	60°	56°	54°
Chance of rain	22%	2%	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)	9 W	6 SW	9 SSE	4 SSE	2 N	5 N	1 ESE	5 S
Humidity	53%	63%	72%	51%	48%	57%	65%	75%
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	61°	69°	62°	57°	59°	59°	60°
AIFS	62°	64°	61°	58°	58°	58°	60°
GFS	61°	61°	65°	57°	59°	59°	58°
ICON	61°	63°	62°	58°	61°	59°	59°
Confidence	high	medium	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	0.01 in	0.84 in	0	0.45 in	0.16 in	0.05 in
AIFS	0.02 in	0.17 in	0.80 in	0.05 in	0.89 in	0.20 in	0.10 in
GFS	0.01 in	0.14 in	1.18 in	0.00 in	0.49 in	0.06 in	0
ICON	0	0.09 in	0.59 in	0	0.30 in	0.03 in	0
Confidence	high	medium	high	medium	medium	medium	medium

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	919	712	1834	1528	1123	1630	1021
AIFS	11	11	16	15	11	10	8
GFS	1217	1321	2534	1825	1524	2026	1114
ICON	1119	713	1834	1524	1526	1423	1016
Confidence	high	high	medium	high	high	medium	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)	22%	82%	100%	18%	82%	71%	31%
GFS (GEFS, 31 scenarios)	55%	63%	100%	29%	94%	86%	26%

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	A bit below −1.6 °F	Normal	—
Nov 9 – Nov 15Nov 9–Nov 15	Normal −0.7 °F	Normal	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +0.9 °F	Normal	54° / 44°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +1.8 °F	Normal	52° / 42°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +2.2 °F	Normal	49° / 40°

Coming months

When	TemperatureTemp.	Rain
November	Above +3.1 °F	Normal
December	A bit above +2.5 °F	Normal
January	A bit above +2.2 °F	Normal
February	Above +2.9 °F	Normal
March	Above +3.1 °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).

Seirō climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Seirō is from May to June and from August to September: highs of 70 °F to 87 °F, about 11 rainy days a month and 5 hours of sunshine a day.

Typhoon season: in June and from August to October, peaking in September. In the last 30 years (1996–2025), 14 tropical cyclones passed within 93 mi of Seirō, about 5 every 10 years; 3 of them with hurricane-force winds (74 mph or more). The most recent: Lupit, in August 2021.

41° 31°

JanJ
42° 31°

FebF
49° 36°

MarM
61° 45°

AprA
70° 54°

MayM
76° 63°

JunJ
83° 71°

JulJ
87° 73°

AugA
79° 66°

SepS
69° 54°

OctO
58° 44°

NovN
47° 36°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves	Cyclones
JanuaryJan	41°	31°	8.39 in	21	2.2	54°	8.0 ft	–
FebruaryFeb	42°	31°	5.53 in	15	3.3	50°	6.8 ft	–
MarchMar	49°	36°	5.04 in	13	4.4	49°	5.1 ft	–
AprilApr	61°	45°	4.23 in	10	5.6	51°	3.6 ft	–
MayMay	70°	54°	3.71 in	10	6.0	58°	2.6 ft	–
JuneJun	76°	63°	4.86 in	10	5.0	67°	2.0 ft	2
JulyJul	83°	71°	7.69 in	15	4.5	74°	1.8 ft	–
AugustAug	87°	73°	4.98 in	13	6.2	79°	2.1 ft	4
SeptemberSep	79°	66°	6.07 in	13	4.5	77°	2.7 ft	6
OctoberOct	69°	54°	6.90 in	13	3.9	71°	4.5 ft	2
NovemberNov	58°	44°	8.12 in	17	2.9	65°	5.9 ft	–
DecemberDec	47°	36°	10.46 in	21	1.9	59°	8.0 ft	–

Month	Water	Waves	Cyclones
Jan	54°	8.0 ft	–
Feb	50°	6.8 ft	–
Mar	49°	5.1 ft	–
Apr	51°	3.6 ft	–
May	58°	2.6 ft	–
Jun	67°	2.0 ft	2
Jul	74°	1.8 ft	–
Aug	79°	2.1 ft	4
Sep	77°	2.7 ft	6
Oct	71°	4.5 ft	2
Nov	65°	5.9 ft	–
Dec	59°	8.0 ft	–

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

A normal year brings 76.00 in of rain on about 170 days and about 1,550 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 58 °F

Tomorrow56 / 69 °F

It's 60 °F now (feels like 58 °F). Today, 48 °F to 61 °F; tomorrow, 56 °F to 69 °F.

Chance of rain

Today 22%
Fri 30 82% 0.01 in
Sat 31 100% 0.84 in
Sun 1 18%
Mon 2 82% 0.45 in
Tue 3 71% 0.16 in
Wed 4 31% 0.05 in

Today the chance of rain reaches 22%. The next day with likely rain is Friday 30: 82% and 0.01 in.

Recent rain: last 24 hours, 0.07 in; last 3 days, 0.46 in; last 7 days, 2.12 in.

Humidity and dew point

Humidity48%

Dew point40 °F

Humidity is 48% now and the dew point is 40 °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

Clouds34%

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

Now4

Today's peak4moderate

Fri 30: 3 · 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

29.8030.0030.2030.40 29.86

Falling now (−0.08 inHg in 3 hours). Over the next 48 hours: −0.35 inHg. Falling pressure: anglers say fish feed more before the change. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityFair · 36

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	Drizzle	51 / 55 °F	0.20 in	26 mph WNW
Tue 27	Heavy drizzle	57 / 68 °F	0.24 in	20 mph W
Mon 26	Light drizzle	59 / 64 °F	0.02 in	10 mph NNE
Sun 25	Rain	61 / 67 °F	1.37 in	13 mph NNE
Sat 24	Drizzle	56 / 64 °F	0.28 in	6 mph ESE
Fri 23	Overcast	52 / 63 °F	0	8 mph ENE
Thu 22	Light rain	56 / 62 °F	0.24 in	18 mph NW

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Rain	62 / 71 °F	2.15 in	13 mph SW
Tue 20	Rain	62 / 67 °F	1.32 in	8 mph SSE
Mon 19	Light rain	65 / 70 °F	0.35 in	13 mph S
Sun 18	Overcast	48 / 75 °F	0	12 mph SE
Sat 17	Partly cloudy	54 / 67 °F	0	11 mph NW
Fri 16	Drizzle	58 / 72 °F	0.11 in	14 mph SSW
Thu 15	Light drizzle	58 / 70 °F	0.00 in	11 mph WSW
Wed 14	Light rain	62 / 68 °F	0.80 in	16 mph WSW
Tue 13	Clear sky	56 / 76 °F	0	5 mph NNE
Mon 12	Overcast	58 / 72 °F	0	10 mph N
Sun 11	Partly cloudy	58 / 73 °F	0	8 mph NNE
Sat 10	Clear sky	54 / 76 °F	0	7 mph ENE
Fri 9	Clear sky	53 / 72 °F	0	7 mph NE
Thu 8	Overcast	56 / 71 °F	0	8 mph S
Wed 7	Light drizzle	61 / 69 °F	0.05 in	11 mph NW
Tue 6	Light rain	65 / 71 °F	0.24 in	11 mph NNW
Mon 5	Light drizzle	61 / 77 °F	0.02 in	6 mph SSE
Sun 4	Overcast	55 / 70 °F	0	5 mph ENE
Sat 3	Light drizzle	57 / 67 °F	0.04 in	11 mph NW
Fri 2	Light drizzle	62 / 70 °F	0.06 in	13 mph NW
Thu 1	Light rain	60 / 77 °F	0.26 in	13 mph WSW
Wed 30	Partly cloudy	59 / 73 °F	0	8 mph NE
Tue 29	Drizzle	63 / 71 °F	0.17 in	7 mph SW

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 SeirōQuestions

What's the weather like today in Seirō?

Overcast, from 48 °F to 61 °F, with a light air from the northeast (1 mph) and a 22% chance of rain.

Will it rain tomorrow in Seirō?

On Friday 30 the chance of rain is 82% (0.01 in): light drizzle.

How warm will it be this week?

Between a low of 48 °F and a high of 69 °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 30.24 inHg and falling: +0.11 inHg over the last 24 hours.

When is the best time to visit Seirō?

The best time to visit Seirō is from May to June and from August to September: highs of 70 °F to 87 °F, about 11 rainy days a month and 5 hours of sunshine a day.

What is the weather like in Seirō in October?

In October, Seirō normally sees highs of 69 °F and lows of 54 °F, with about 13 rainy days (6.90 in for the month) and 4 hours of sunshine a day. The sea is around 71 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Seirō?

The warmest is August, with average highs of 87 °F, and the coldest February, with lows of 31 °F. The wettest is December (10.46 in) and the driest, May.

When is typhoon season in Seirō?

Typhoon season: in June and from August to October, peaking in September. In the last 30 years (1996–2025), 14 tropical cyclones passed within 93 mi of Seirō, about 5 every 10 years; 3 of them with hurricane-force winds (74 mph or more). The most recent: Lupit, in August 2021.

More about Seirō today

Weather near Seirō

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 1.2 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 11:41 am (local time).

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