Siwan, Bihar Weather
Hourly forecast in Siwan
16-day forecast for Siwan
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Siwan air quality & conditions
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About Siwan weather
Siwan, in Bihar's Gangetic plain, criss-crossed by major rivers and prone to monsoon flooding in low-lying districts, is positioned about 104 km west of Muzaffarpur. The warmer months mean a hot summer (April–June) with highs often above 38–40°C. Next, the south-west monsoon (June–September), the state's main rainy season and a recurring flood risk near the Ganga, Kosi and Gandak rivers takes over. Finally, there's a cold winter (December–January) with fog and cool nights. This page shows live, auto-refreshing weather for Siwan: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: Asia/Kolkata.
Frequently asked questions
Siwan is about 104 km west of Muzaffarpur, in Bihar.
Siwan gets the south-west monsoon (June–September), the state's main rainy season and a recurring flood risk near the Ganga, Kosi and Gandak rivers.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Siwan's exact coordinates. No fixed schedule, the page updates whenever you load it.
Yes, use the "View live radar" link on this page for real-time precipitation radar centered on Siwan.
Yes, where the AQI panel above shows a value. It's sourced from the same live air-quality provider used across TodayWeather. If it reads "not available," air-quality coverage doesn't currently extend to this location.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Siwan updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
The hourly forecast above shows the rain chance for Siwan hour by hour — the 16-day outlook further down covers the rest of the week.
Siwan's live UV index is in the metrics panel above, shown alongside a low/moderate/high band so it's easy to tell when sun protection is worth it.
Siwan's current relative humidity is in the humidity ring near the top of this page, with more detail in the metrics section below.
Siwan's day-to-day weather is shaped by its position in Bihar, India. See the hourly weather forecast or the air quality index for more detail.