How accurate is the forecast for Isumi?

Forecasts are pulled from leading meteorological models and refreshed automatically every 30 minutes. Short-range accuracy (next 24 hours) is typically within 1–2°C and 80–90% for precipitation.

How often is the data updated?

Current conditions and the hourly outlook refresh every 30 minutes; daily forecasts every hour.

What does the air-quality (AQI) value mean?

We display the European AQI on a scale from Good (0–20) to Extremely poor (>100), blending PM2.5, PM10, NO₂ and O₃.

Clima Map

Isumi JP

July 24, 2026 · 1:27 am

29^°

Mayormente despejado

Sensación 35°C

Humedad: 84%
Viento: 7 km/h ENE
Presión: 1011 hPa
Cloud: 30%

Índice UV

Moderada

5.5

Wear sunscreen and a hat outdoors.

Clima cercano

Ciudades cerca de Isumi

Compare weather conditions in surrounding cities and open any local forecast instantly.

2.2 km Ōhara JP View forecast 6.4 km Shinmachi JP View forecast 16 km Ichinomiya JP View forecast 16 km Ōtaki JP View forecast 16.1 km Kawasugaya JP View forecast 23.9 km Mobara JP View forecast 24.1 km Chōnan JP View forecast 26.1 km Ushigome JP View forecast

Weather notice Forecasts are for general planning. During severe weather, follow official alerts and local authority instructions.