Current Conditions

Tatsuno, Nagano

69°F21°C

Light Rain

Wind

SSE 3 mph5 km/h

Humidity

77%

Cloud Cover

82%

As of Wednesday, September 23, 2026 at 3:04 PM GMT+9

Today's Outlook

Day

Overcast and warm, with a high of 70°F21°C. Light wind from the SE around 3 mph5 km/h. 81% chance of light rain around midday.

Night

Overcast, with a low around 64°F18°C. Light wind from the SSE around 3 mph4 km/h. 90% chance of light rain throughout the night.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Light Rain	High 70°F21°C	Low 64°F18°C	Precip 0.12 in3 mm90%	Cloud 83%	Wind SE 3 mph4 km/h	Wednesday: Overcast and warm, with a high of 70°F21°C. Light wind from the SE around 3 mph5 km/h. 81% chance of light rain around midday. Wednesday Night: Overcast, with a low around 64°F18°C. Light wind from the SSE around 3 mph4 km/h. 90% chance of light rain throughout the night.
Drizzle	High 76°F24°C	Low 61°F16°C	Precip 0.05 in1.2 mm38%	Cloud 72%	Wind NW 3 mph5 km/h	Thursday: Mostly cloudy and warm, with a high of 76°F24°C and morning low of 61°F16°C. Light wind from the WNW around 3 mph4 km/h. 38% chance of drizzle throughout the day. Thursday Night: Overcast, with a low around 62°F17°C. Light wind from the N around 3 mph5 km/h. 38% chance of drizzle overnight.
Light Rain	High 71°F22°C	Low 60°F15°C	Precip 0.13 in3.4 mm60%	Cloud 88%	Wind N 2 mph3 km/h	Friday: Overcast and warm, with a high of 71°F22°C and morning low of 60°F15°C. Light wind from the SW around 2 mph3 km/h. 60% chance of light rain throughout the day. Friday Night: Overcast, with a low around 60°F16°C. Light wind from the N around 2 mph3 km/h. 58% chance of light rain throughout the night.
Rain	High 61°F16°C	Low 58°F15°C	Precip 1.02 in25.8 mm98%	Cloud 100%	Wind SSE 2 mph3 km/h	Saturday: Overcast and mild, with a high of 61°F16°C. Light wind from the SE around 2 mph3 km/h. 98% chance of rain throughout the day. Saturday Night: Overcast, with a low around 59°F15°C. Light wind from the S around 2 mph3 km/h. 96% chance of rain throughout the night.
Rain	High 65°F18°C	Low 58°F14°C	Precip 0.59 in14.9 mm72%	Cloud 98%	Wind SSW 3 mph5 km/h	Sunday: Overcast and mild, with a high of 65°F18°C and morning low of 58°F14°C. Light wind from the SSW around 3 mph5 km/h. 71% chance of rain throughout the day. Sunday Night: Overcast, with a low around 58°F15°C. Light wind from the SSW around 3 mph4 km/h. 72% chance of light rain throughout the night.
Light Rain	High 68°F20°C	Low 59°F15°C	Precip 0.53 in13.4 mm64%	Cloud 96%	Wind SW 4 mph6 km/h	Monday: Overcast and mild, with a high of 68°F20°C and morning low of 59°F15°C. Light wind from the SW around 4 mph7 km/h. 60% chance of light rain throughout the day. Monday Night: Overcast, with a low around 60°F15°C. Light wind from the SW around 3 mph5 km/h. 64% chance of light rain throughout the night.
Rain	High 67°F19°C	Low 57°F14°C	Precip 0.53 in13.5 mm50%	Cloud 89%	Wind SW 3 mph4 km/h	Tuesday: Overcast and mild, with a high of 67°F19°C and morning low of 57°F14°C. Light wind from the SSW around 3 mph4 km/h. 48% chance of light rain throughout the day. Tuesday Night: Overcast, with a low around 58°F14°C. Light wind from the SW around 3 mph5 km/h. 50% chance of rain throughout the night.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 23	70°F21°C	64°F18°C	0.12 in3 mm· 90%	83%	Light Rain	SE 3 mph4 km/h
DayOvercast and warm, with a high of 70°F21°C. Light wind from the SE around 3 mph5 km/h. 81% chance of light rain around midday. NightOvercast, with a low around 64°F18°C. Light wind from the SSE around 3 mph4 km/h. 90% chance of light rain throughout the night.
	ThursdaySep 24	76°F24°C	61°F16°C	0.05 in1.2 mm· 38%	72%	Drizzle	NW 3 mph5 km/h
DayMostly cloudy and warm, with a high of 76°F24°C and morning low of 61°F16°C. Light wind from the WNW around 3 mph4 km/h. 38% chance of drizzle throughout the day. NightOvercast, with a low around 62°F17°C. Light wind from the N around 3 mph5 km/h. 38% chance of drizzle overnight.
	FridaySep 25	71°F22°C	60°F15°C	0.13 in3.4 mm· 60%	88%	Light Rain	N 2 mph3 km/h
DayOvercast and warm, with a high of 71°F22°C and morning low of 60°F15°C. Light wind from the SW around 2 mph3 km/h. 60% chance of light rain throughout the day. NightOvercast, with a low around 60°F16°C. Light wind from the N around 2 mph3 km/h. 58% chance of light rain throughout the night.
	SaturdaySep 26	61°F16°C	58°F15°C	1.02 in25.8 mm· 98%	100%	Rain	SSE 2 mph3 km/h
DayOvercast and mild, with a high of 61°F16°C. Light wind from the SE around 2 mph3 km/h. 98% chance of rain throughout the day. NightOvercast, with a low around 59°F15°C. Light wind from the S around 2 mph3 km/h. 96% chance of rain throughout the night.
	SundaySep 27	65°F18°C	58°F14°C	0.59 in14.9 mm· 72%	98%	Rain	SSW 3 mph5 km/h
DayOvercast and mild, with a high of 65°F18°C and morning low of 58°F14°C. Light wind from the SSW around 3 mph5 km/h. 71% chance of rain throughout the day. NightOvercast, with a low around 58°F15°C. Light wind from the SSW around 3 mph4 km/h. 72% chance of light rain throughout the night.
	MondaySep 28	68°F20°C	59°F15°C	0.53 in13.4 mm· 64%	96%	Light Rain	SW 4 mph6 km/h
DayOvercast and mild, with a high of 68°F20°C and morning low of 59°F15°C. Light wind from the SW around 4 mph7 km/h. 60% chance of light rain throughout the day. NightOvercast, with a low around 60°F15°C. Light wind from the SW around 3 mph5 km/h. 64% chance of light rain throughout the night.
	TuesdaySep 29	67°F19°C	57°F14°C	0.53 in13.5 mm· 50%	89%	Rain	SW 3 mph4 km/h
DayOvercast and mild, with a high of 67°F19°C and morning low of 57°F14°C. Light wind from the SSW around 3 mph4 km/h. 48% chance of light rain throughout the day. NightOvercast, with a low around 58°F14°C. Light wind from the SW around 3 mph5 km/h. 50% chance of rain throughout the night.
	WednesdaySep 30	68°F20°C	58°F15°C	0.71 in18.1 mm· 62%	80%	Rain	SW 4 mph6 km/h
DayOvercast and mild, with a high of 68°F20°C and morning low of 58°F15°C. Light wind from the SW around 4 mph6 km/h. 62% chance of rain throughout the day. NightOvercast, with a low around 59°F15°C. Light wind from the SW around 3 mph6 km/h. 61% chance of rain throughout the night.
	ThursdayOct 1	68°F20°C	57°F14°C	0.48 in12.2 mm· 49%	64%	Showers	W 3 mph6 km/h
DayMostly cloudy and warm, with a high of 68°F20°C and morning low of 57°F14°C. Light wind from the WSW around 3 mph6 km/h. 49% chance of showers throughout the day. NightMostly cloudy, with a low around 58°F14°C. Light wind from the W around 3 mph6 km/h. 49% chance of showers throughout the night.
	FridayOct 2	66°F19°C	51°F10°C	0.15 in3.8 mm· 24%	59%	Showers	N 3 mph5 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 51°F10°C. Light wind from the NNE around 3 mph5 km/h. 24% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 52°F11°C. Light wind from the N around 3 mph5 km/h. 22% chance of showers throughout the night.
	SaturdayOct 3	66°F19°C	51°F11°C	0.21 in5.3 mm· 34%	67%	Showers	SSE 3 mph5 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 51°F11°C. Light wind from the SSE around 3 mph5 km/h. 22% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 52°F11°C. Light wind from the SE around 3 mph4 km/h. 34% chance of showers throughout the night.
	SundayOct 4	66°F19°C	52°F11°C	0.31 in7.9 mm· 42%	65%	Showers	NNW 3 mph5 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 52°F11°C. Light wind from the NW around 4 mph6 km/h. 34% chance of showers throughout the day. NightMostly cloudy, with a low around 54°F12°C. Light wind from the N around 3 mph5 km/h. 42% chance of showers throughout the night.
	MondayOct 5	66°F19°C	50°F10°C	0.09 in2.3 mm· 19%	52%	Drizzle	N 3 mph5 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 50°F10°C. Light wind from the NNE around 3 mph6 km/h. 17% chance of drizzle throughout the day. Dry air. NightMostly cloudy, with a low around 52°F11°C. Light wind from the N around 3 mph5 km/h. 19% chance of drizzle throughout the night.
	TuesdayOct 6	67°F19°C	50°F10°C	0.16 in4.1 mm· 18%	50%	Showers	N 3 mph5 km/h
DayMostly cloudy and mild, with a high of 67°F19°C and morning low of 50°F10°C. Light wind from the N around 3 mph5 km/h. 18% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 52°F11°C. Light wind from the N around 3 mph5 km/h. 18% chance of showers throughout the night.
	WednesdayOct 7	66°F19°C	51°F11°C	0.22 in5.7 mm· 24%	56%	Showers	N 3 mph5 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 51°F11°C. Light wind from the NNE around 3 mph6 km/h. 24% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 52°F11°C. Light wind from the N around 3 mph5 km/h. 22% chance of showers 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