Current Conditions

Tatsuno, Nagano

71°F21°C

Rain

Wind

SW 3 mph5 km/h

Humidity

85%

Cloud Cover

100%

As of Thursday, September 3, 2026 at 9:43 AM GMT+9

Today's Outlook

Day

Overcast and warm, with a high of 72°F22°C. Light wind from the SW around 3 mph5 km/h. 95% chance of rain throughout the day. Humid.

Night

Overcast, with a low around 66°F19°C. Light wind from the SW around 2 mph4 km/h. 100% chance of rain throughout the night.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Rain	High 72°F22°C	Low 66°F19°C	Precip 0.6 in15.3 mm100%	Cloud 100%	Wind SW 3 mph5 km/h	Thursday: Overcast and warm, with a high of 72°F22°C. Light wind from the SW around 3 mph5 km/h. 95% chance of rain throughout the day. Humid. Thursday Night: Overcast, with a low around 66°F19°C. Light wind from the SW around 2 mph4 km/h. 100% chance of rain throughout the night.
Rain	High 68°F20°C	Low 64°F18°C	Precip 0.57 in14.6 mm91%	Cloud 100%	Wind W 2 mph3 km/h	Friday: Overcast and warm, with a high of 68°F20°C. Light wind from the NNE around 2 mph3 km/h. 91% chance of rain throughout the day. Friday Night: Overcast, with a low around 64°F18°C. Light wind from the WSW around 2 mph3 km/h. 91% chance of rain throughout the night.
Rain	High 73°F23°C	Low 61°F16°C	Precip 0.26 in6.7 mm76%	Cloud 94%	Wind ENE 3 mph4 km/h	Saturday: Overcast and warm, with a high of 73°F23°C and morning low of 61°F16°C. Light wind from the NE around 3 mph4 km/h. 44% chance of light rain throughout the day. Saturday Night: Overcast, with a low around 62°F17°C. Light wind from the ENE around 2 mph4 km/h. 76% chance of rain overnight.
Rain	High 69°F20°C	Low 61°F16°C	Precip 0.3 in7.7 mm67%	Cloud 98%	Wind ENE 4 mph6 km/h	Sunday: Overcast and warm, with a high of 69°F20°C and morning low of 61°F16°C. Light wind from the ENE around 4 mph7 km/h. 43% chance of light rain throughout the day. Sunday Night: Overcast, with a low around 62°F17°C. Light wind from the NE around 3 mph5 km/h. 67% chance of rain in the evening.
Rain	High 69°F20°C	Low 62°F16°C	Precip 1.44 in36.7 mm91%	Cloud 95%	Wind NE 3 mph5 km/h	Monday: Overcast and warm, with a high of 69°F20°C and morning low of 62°F16°C. Light wind from the NE around 3 mph5 km/h. 91% chance of rain throughout the day. Monday Night: Overcast, with a low around 62°F16°C. Light wind from the NE around 3 mph5 km/h. 84% chance of rain throughout the night.
Light Rain	High 76°F25°C	Low 65°F19°C	Precip 0.51 in12.9 mm78%	Cloud 84%	Wind SSW 3 mph4 km/h	Tuesday: Overcast and warm, with a high of 76°F25°C and morning low of 65°F19°C. Light wind from the SSW around 3 mph5 km/h. 78% chance of light rain throughout the day. Humid. Tuesday Night: Overcast, with a low around 65°F19°C. Light wind from the SSW around 2 mph4 km/h. 69% chance of light rain throughout the night.
Rain	High 75°F24°C	Low 68°F20°C	Precip 0.69 in17.5 mm88%	Cloud 89%	Wind SW 3 mph5 km/h	Wednesday: Overcast and warm, with a high of 75°F24°C and morning low of 68°F20°C. Light wind from the SW around 3 mph5 km/h. 88% chance of rain throughout the day. Humid. Wednesday Night: Overcast, with a low around 68°F20°C. Light wind from the SSW around 3 mph4 km/h. 82% chance of rain throughout the night.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	ThursdaySep 3	72°F22°C	66°F19°C	0.6 in15.3 mm· 100%	100%	Rain	SW 3 mph5 km/h
DayOvercast and warm, with a high of 72°F22°C. Light wind from the SW around 3 mph5 km/h. 95% chance of rain throughout the day. Humid. NightOvercast, with a low around 66°F19°C. Light wind from the SW around 2 mph4 km/h. 100% chance of rain throughout the night.
	FridaySep 4	68°F20°C	64°F18°C	0.57 in14.6 mm· 91%	100%	Rain	W 2 mph3 km/h
DayOvercast and warm, with a high of 68°F20°C. Light wind from the NNE around 2 mph3 km/h. 91% chance of rain throughout the day. NightOvercast, with a low around 64°F18°C. Light wind from the WSW around 2 mph3 km/h. 91% chance of rain throughout the night.
	SaturdaySep 5	73°F23°C	61°F16°C	0.26 in6.7 mm· 76%	94%	Rain	ENE 3 mph4 km/h
DayOvercast and warm, with a high of 73°F23°C and morning low of 61°F16°C. Light wind from the NE around 3 mph4 km/h. 44% chance of light rain throughout the day. NightOvercast, with a low around 62°F17°C. Light wind from the ENE around 2 mph4 km/h. 76% chance of rain overnight.
	SundaySep 6	69°F20°C	61°F16°C	0.3 in7.7 mm· 67%	98%	Rain	ENE 4 mph6 km/h
DayOvercast and warm, with a high of 69°F20°C and morning low of 61°F16°C. Light wind from the ENE around 4 mph7 km/h. 43% chance of light rain throughout the day. NightOvercast, with a low around 62°F17°C. Light wind from the NE around 3 mph5 km/h. 67% chance of rain in the evening.
	MondaySep 7	69°F20°C	62°F16°C	1.44 in36.7 mm· 91%	95%	Rain	NE 3 mph5 km/h
DayOvercast and warm, with a high of 69°F20°C and morning low of 62°F16°C. Light wind from the NE around 3 mph5 km/h. 91% chance of rain throughout the day. NightOvercast, with a low around 62°F16°C. Light wind from the NE around 3 mph5 km/h. 84% chance of rain throughout the night.
	TuesdaySep 8	76°F25°C	65°F19°C	0.51 in12.9 mm· 78%	84%	Light Rain	SSW 3 mph4 km/h
DayOvercast and warm, with a high of 76°F25°C and morning low of 65°F19°C. Light wind from the SSW around 3 mph5 km/h. 78% chance of light rain throughout the day. Humid. NightOvercast, with a low around 65°F19°C. Light wind from the SSW around 2 mph4 km/h. 69% chance of light rain throughout the night.
	WednesdaySep 9	75°F24°C	68°F20°C	0.69 in17.5 mm· 88%	89%	Rain	SW 3 mph5 km/h
DayOvercast and warm, with a high of 75°F24°C and morning low of 68°F20°C. Light wind from the SW around 3 mph5 km/h. 88% chance of rain throughout the day. Humid. NightOvercast, with a low around 68°F20°C. Light wind from the SSW around 3 mph4 km/h. 82% chance of rain throughout the night.
	ThursdaySep 10	71°F22°C	66°F19°C	0.99 in25.1 mm· 91%	91%	Rain	S 3 mph4 km/h
DayOvercast and warm, with a high of 71°F22°C and morning low of 66°F19°C. Light wind from the S around 3 mph5 km/h. 91% chance of rain throughout the day. Humid. NightOvercast, with a low around 66°F19°C. Light wind from the SE around 2 mph4 km/h. 88% chance of rain throughout the night.
	FridaySep 11	72°F22°C	65°F18°C	0.69 in17.4 mm· 76%	89%	Rain	S 3 mph4 km/h
DayOvercast and warm, with a high of 72°F22°C and morning low of 65°F18°C. Light wind from the S around 3 mph4 km/h. 76% chance of light rain throughout the day. NightOvercast, with a low around 65°F18°C. Light wind from the SSE around 2 mph4 km/h. 76% chance of rain throughout the night.
	SaturdaySep 12	74°F23°C	65°F18°C	0.49 in12.4 mm· 71%	83%	Light Rain	SSW 3 mph5 km/h
DayOvercast and warm, with a high of 74°F23°C and morning low of 65°F18°C. Light wind from the SSW around 3 mph5 km/h. 71% chance of light rain throughout the day. NightOvercast, with a low around 65°F19°C. Light wind from the S around 2 mph4 km/h. 65% chance of light rain throughout the night.
	SundaySep 13	75°F24°C	65°F18°C	0.33 in8.3 mm· 63%	80%	Light Rain	SSW 3 mph5 km/h
DayMostly cloudy and warm, with a high of 75°F24°C and morning low of 65°F18°C. Light wind from the SSW around 3 mph5 km/h. 63% chance of light rain throughout the day. NightOvercast, with a low around 66°F19°C. Light wind from the SSW around 3 mph4 km/h. 59% chance of light rain throughout the night.
	MondaySep 14	74°F23°C	64°F18°C	0.47 in11.9 mm· 68%	79%	Light Rain	SSW 3 mph5 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 64°F18°C. Light wind from the SSW around 3 mph5 km/h. 68% chance of light rain throughout the day. NightOvercast, with a low around 65°F18°C. Light wind from the SSW around 3 mph4 km/h. 61% chance of light rain throughout the night.
	TuesdaySep 15	72°F22°C	63°F17°C	0.5 in12.6 mm· 77%	85%	Rain	S 3 mph4 km/h
DayOvercast and warm, with a high of 72°F22°C and morning low of 63°F17°C. Light wind from the SSW around 3 mph5 km/h. 77% chance of rain throughout the day. NightOvercast, with a low around 64°F18°C. Light wind from the SSE around 2 mph4 km/h. 74% chance of light rain throughout the night.
	WednesdaySep 16	72°F22°C	61°F16°C	0.39 in9.9 mm· 69%	84%	Light Rain	SSE 3 mph4 km/h
DayOvercast and warm, with a high of 72°F22°C and morning low of 61°F16°C. Light wind from the S around 3 mph4 km/h. 69% chance of light rain throughout the day. NightOvercast, with a low around 62°F17°C. Light wind from the ESE around 2 mph4 km/h. 58% chance of light rain throughout the night.
	ThursdaySep 17	71°F22°C	61°F16°C	0.44 in11.1 mm· 66%	83%	Light Rain	SSE 3 mph4 km/h
DayOvercast and warm, with a high of 71°F22°C and morning low of 61°F16°C. Light wind from the SSE around 3 mph5 km/h. 66% chance of light rain throughout the day. NightOvercast, with a low around 62°F17°C. Light wind from the SE around 3 mph4 km/h. 57% chance of light rain throughout the night.

Nearby Cities

Okaya6 mi9 km Kinoshita6 mi9 km Suwa7 mi12 km Shimosuwa8 mi12 km Minamiminowa8 mi13 km Shiojiri8 mi13 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.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 35.9843°N, 137.9972°E·Elevation: 726m·Timezone: Asia/Tokyo·Population: 18,951