Current Conditions

Isumi, Chiba

82°F28°C

Heavy Rain

Feels like92°F33°C

Wind

SW 23 mph36 km/h

Humidity

87%

Cloud Cover

53%

As of Wednesday, September 9, 2026 at 8:49 AM GMT+9

Today's Outlook

Day

Mostly cloudy and warm, with a high of 83°F28°C — feels like 93°F34°C. Windy from the SW at 22 to 23 mph36 to 37 km/h. 45% chance of drizzle throughout the day. Heavy, humid air.

Night

Overcast, with a low around 74°F23°C. Windy from the SW at 18 to 22 mph29 to 36 km/h. 100% chance of heavy rain throughout the night.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Heavy Rain	High 83°F28°CFeels 93°F34°C	Low 74°F23°C	Precip 0.74 in18.7 mm100%	Cloud 67%	Wind SW 20 mph33 km/h	Wednesday: Mostly cloudy and warm, with a high of 83°F28°C — feels like 93°F34°C. Windy from the SW at 22 to 23 mph36 to 37 km/h. 45% chance of drizzle throughout the day. Heavy, humid air. Wednesday Night: Overcast, with a low around 74°F23°C. Windy from the SW at 18 to 22 mph29 to 36 km/h. 100% chance of heavy rain throughout the night.
Rain	High 73°F23°C	Low 71°F22°C	Precip 0.62 in15.7 mm99%	Cloud 99%	Wind NE 16 mph27 km/h	Thursday: Overcast and warm, with a high of 73°F23°C. Windy from the NE at 16 to 18 mph26 to 28 km/h. 82% chance of light rain throughout the day. Humid. Thursday Night: Overcast, with a low around 71°F22°C. Windy from the NE at 17 to 20 mph27 to 33 km/h. 99% chance of rain throughout the night.
Rain	High 74°F23°C	Low 72°F22°C	Precip 0.78 in19.7 mm91%	Cloud 97%	Wind NNE 11 mph18 km/h	Friday: Overcast and warm, with a high of 74°F23°C. Breezy from the NNE at 11 to 12 mph18 to 19 km/h. 88% chance of rain throughout the day. Humid. Friday Night: Overcast, with a low around 72°F22°C. Breezy from the NNE at 11 to 12 mph18 to 20 km/h. 91% chance of rain throughout the night.
Light Rain	High 76°F25°C	Low 73°F23°C	Precip 0.24 in6.2 mm50%	Cloud 84%	Wind NE 11 mph18 km/h	Saturday: Overcast and warm, with a high of 76°F25°C. Breezy from the NE at 12 mph19 km/h. 48% chance of light rain throughout the day. Heavy, humid air. Saturday Night: Overcast, with a low around 73°F23°C. Breezy from the NNE at 11 mph17 km/h. 50% chance of light rain throughout the night.
Drizzle	High 79°F26°C	Low 75°F24°C	Precip 0.07 in1.7 mm27%	Cloud 67%	Wind NE 8 mph13 km/h	Sunday: Mostly cloudy and warm, with a high of 79°F26°C. Breezy from the NE at 9 to 10 mph14 to 16 km/h. 27% chance of drizzle throughout the day. Heavy, humid air. Sunday Night: Mostly cloudy, with a low around 75°F24°C. Breezy from the NE at 8 to 9 mph12 to 15 km/h. 22% chance of drizzle overnight.
Drizzle	High 82°F28°CFeels 89°F31°C	Low 77°F25°C	Precip 0.03 in0.8 mm20%	Cloud 40%	Wind SSW 9 mph15 km/h	Monday: Partly cloudy and warm, with a high of 82°F28°C and morning low of 77°F25°C — feels like 88°F31°C. Breezy from the SSW at 10 to 12 mph16 to 19 km/h. 11% chance of drizzle in the morning. Heavy, humid air. Monday Night: Partly cloudy, with a low around 77°F25°C. Breezy from the SSW at 9 to 11 mph14 to 18 km/h. 20% chance of drizzle overnight.
Light Rain	High 80°F27°C	Low 77°F25°C	Precip 0.27 in6.9 mm60%	Cloud 84%	Wind SSW 8 mph13 km/h	Tuesday: Overcast and warm, with a high of 80°F27°C. Breezy from the SSW at 8 mph12 km/h. 56% chance of light rain throughout the day. Heavy, humid air. Tuesday Night: Overcast, with a low around 77°F25°C. Breezy from the SSW at 9 to 11 mph14 to 17 km/h. 60% chance of light rain throughout the night.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 9	83°F28°C Feels 93°F34°C	74°F23°C	0.74 in18.7 mm· 100%	67%	Heavy Rain	SW 20 mph33 km/h
DayMostly cloudy and warm, with a high of 83°F28°C — feels like 93°F34°C. Windy from the SW at 22 to 23 mph36 to 37 km/h. 45% chance of drizzle throughout the day. Heavy, humid air. NightOvercast, with a low around 74°F23°C. Windy from the SW at 18 to 22 mph29 to 36 km/h. 100% chance of heavy rain throughout the night.
	ThursdaySep 10	73°F23°C	71°F22°C	0.62 in15.7 mm· 99%	99%	Rain	NE 16 mph27 km/h
DayOvercast and warm, with a high of 73°F23°C. Windy from the NE at 16 to 18 mph26 to 28 km/h. 82% chance of light rain throughout the day. Humid. NightOvercast, with a low around 71°F22°C. Windy from the NE at 17 to 20 mph27 to 33 km/h. 99% chance of rain throughout the night.
	FridaySep 11	74°F23°C	72°F22°C	0.78 in19.7 mm· 91%	97%	Rain	NNE 11 mph18 km/h
DayOvercast and warm, with a high of 74°F23°C. Breezy from the NNE at 11 to 12 mph18 to 19 km/h. 88% chance of rain throughout the day. Humid. NightOvercast, with a low around 72°F22°C. Breezy from the NNE at 11 to 12 mph18 to 20 km/h. 91% chance of rain throughout the night.
	SaturdaySep 12	76°F25°C	73°F23°C	0.24 in6.2 mm· 50%	84%	Light Rain	NE 11 mph18 km/h
DayOvercast and warm, with a high of 76°F25°C. Breezy from the NE at 12 mph19 km/h. 48% chance of light rain throughout the day. Heavy, humid air. NightOvercast, with a low around 73°F23°C. Breezy from the NNE at 11 mph17 km/h. 50% chance of light rain throughout the night.
	SundaySep 13	79°F26°C	75°F24°C	0.07 in1.7 mm· 27%	67%	Drizzle	NE 8 mph13 km/h
DayMostly cloudy and warm, with a high of 79°F26°C. Breezy from the NE at 9 to 10 mph14 to 16 km/h. 27% chance of drizzle throughout the day. Heavy, humid air. NightMostly cloudy, with a low around 75°F24°C. Breezy from the NE at 8 to 9 mph12 to 15 km/h. 22% chance of drizzle overnight.
	MondaySep 14	82°F28°C Feels 89°F31°C	77°F25°C	0.03 in0.8 mm· 20%	40%	Drizzle	SSW 9 mph15 km/h
DayPartly cloudy and warm, with a high of 82°F28°C and morning low of 77°F25°C — feels like 88°F31°C. Breezy from the SSW at 10 to 12 mph16 to 19 km/h. 11% chance of drizzle in the morning. Heavy, humid air. NightPartly cloudy, with a low around 77°F25°C. Breezy from the SSW at 9 to 11 mph14 to 18 km/h. 20% chance of drizzle overnight.
	TuesdaySep 15	80°F27°C	77°F25°C	0.27 in6.9 mm· 60%	84%	Light Rain	SSW 8 mph13 km/h
DayOvercast and warm, with a high of 80°F27°C. Breezy from the SSW at 8 mph12 km/h. 56% chance of light rain throughout the day. Heavy, humid air. NightOvercast, with a low around 77°F25°C. Breezy from the SSW at 9 to 11 mph14 to 17 km/h. 60% chance of light rain throughout the night.
	WednesdaySep 16	78°F26°C	76°F24°C	0.38 in9.7 mm· 68%	89%	Light Rain	NE 9 mph15 km/h
DayOvercast and warm, with a high of 78°F26°C. Breezy from the NE at 9 to 11 mph15 to 17 km/h. 68% chance of light rain throughout the day. Heavy, humid air. NightOvercast, with a low around 76°F24°C. Breezy from the NE at 9 to 11 mph15 to 18 km/h. 68% chance of light rain throughout the night.
	ThursdaySep 17	77°F25°C	75°F24°C	0.41 in10.5 mm· 61%	86%	Light Rain	NNE 13 mph22 km/h
DayOvercast and warm, with a high of 77°F25°C. Breezy from the NNE at 14 to 15 mph22 to 24 km/h. 61% chance of light rain throughout the day. Heavy, humid air. NightOvercast, with a low around 75°F24°C. Breezy from the NNE at 13 to 15 mph21 to 25 km/h. 59% chance of light rain throughout the night.
	FridaySep 18	76°F25°C	74°F24°C	1.08 in27.4 mm· 67%	84%	Rain	NNE 17 mph28 km/h
DayOvercast and warm, with a high of 76°F25°C. Windy from the NNE at 18 to 19 mph28 to 30 km/h. 67% chance of rain throughout the day. Heavy, humid air. NightOvercast, with a low around 74°F24°C. Windy from the NNE at 17 to 19 mph27 to 30 km/h. 60% chance of rain throughout the night.
	SaturdaySep 19	77°F25°C	75°F24°C	1.22 in30.9 mm· 60%	81%	Rain	NE 17 mph28 km/h
DayOvercast and warm, with a high of 77°F25°C. Windy from the NNE at 18 mph29 km/h. 60% chance of rain throughout the day. Heavy, humid air. NightMostly cloudy, with a low around 75°F24°C. Windy from the NE at 17 to 18 mph27 to 30 km/h. 59% chance of rain throughout the night.
	SundaySep 20	77°F25°C	75°F24°C	0.83 in21 mm· 56%	74%	Rain	ENE 16 mph26 km/h
DayMostly cloudy and warm, with a high of 77°F25°C. Windy from the ENE at 17 mph27 km/h. 56% chance of rain throughout the day. Humid. NightMostly cloudy, with a low around 75°F24°C. Windy from the ENE at 16 to 17 mph26 to 27 km/h. 52% chance of rain throughout the night.
	MondaySep 21	76°F25°C	74°F23°C	0.57 in14.4 mm· 50%	70%	Showers	ENE 14 mph23 km/h
DayMostly cloudy and warm, with a high of 76°F25°C. Breezy from the ENE at 15 mph24 km/h. 50% chance of light rain throughout the day. Humid. NightMostly cloudy, with a low around 74°F24°C. Breezy from the ENE at 14 to 15 mph22 to 23 km/h. 48% chance of showers throughout the night.
	TuesdaySep 22	76°F24°C	73°F23°C	0.45 in11.5 mm· 45%	69%	Showers	NE 13 mph21 km/h
DayMostly cloudy and warm, with a high of 76°F24°C. Breezy from the NE at 13 mph21 km/h. 45% chance of light rain throughout the day. Humid. NightMostly cloudy, with a low around 73°F23°C. Breezy from the NE at 12 to 13 mph20 to 21 km/h. 40% chance of showers throughout the night.
	WednesdaySep 23	76°F24°C	72°F22°C	0.44 in11.2 mm· 30%	64%	Showers	NE 12 mph20 km/h
DayMostly cloudy and warm, with a high of 76°F24°C. Breezy from the NE at 13 to 14 mph21 to 22 km/h. 30% chance of showers throughout the day. Humid. NightMostly cloudy, with a low around 73°F23°C. Breezy from the NE at 12 to 13 mph19 to 21 km/h. 30% chance of showers throughout the night.

Nearby Cities

Ōhara1 mi2 km Katsuura8 mi12 km Mobara15 mi24 km Kamogawa20 mi31 km Ōamishirasato20 mi32 km Ōami20 mi33 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

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Coordinates: 35.2300°N, 140.4049°E·Elevation: 1m·Timezone: Asia/Tokyo·Population: 35,544