Climate averages 1991–2020
Siwān weather
in May.
A very hot, fairly dry month: the warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a very hot month in Siwān: daytime highs average 37.6°C and nights cool to about 26.1°C. By daytime temperature it is the warmest month of the year.
Expect about 29 mm of rain on roughly 5 days, which makes May a fairly dry month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 25 min on an average May day.
The nearest other city in this atlas is Chāpra (63 km away). In May its highs average 37.9°C, about as warm as Siwān, with 28 mm of rain.
Among the 692 cities listed in India, Siwān ranks joint 414th of 692 for the warmest May highs and joint 380th of 692 for the driest May (rainfall, lowest first). The mean May high of those 692 cities is 37.3°C; Siwān is 0.3°C warmer than that mean.
From May to June, average highs fall by 2.1°C to 35.6°C, and monthly rainfall rises from 29 mm to 180 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Siwān climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 21.8°C10.3°C | 10.3°C | 16 | 2.2 | 10.711 h |
| February | 25.7°C13.2°C | 13.2°C | 17 | 2.4 | 11.311 h |
| March | 32.0°C18.2°C | 18.2°C | 12 | 2.1 | 12.012 h |
| April | 37.1°C23.3°C | 23.3°C | 10 | 2.5 | 12.813 h |
| May, selected | 37.6°C26.1°C | 26.1°C | 29 | 5.2 | 13.413 h |
| June | 35.6°C27.0°C | 27.0°C | 180 | 15.5 | 13.814 h |
| July | 31.9°C26.3°C | 26.3°C | 329 | 26.0 | 13.614 h |
| August | 31.5°C26.0°C | 26.0°C | 294 | 26.6 | 13.113 h |
| September | 30.9°C25.0°C | 25.0°C | 205 | 20.5 | 12.312 h |
| October | 30.2°C21.3°C | 21.3°C | 37 | 4.3 | 11.612 h |
| November | 27.8°C16.0°C | 16.0°C | 4.5 | 0.4 | 10.911 h |
| December | 23.7°C11.8°C | 11.8°C | 7.6 | 0.7 | 10.511 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Chāpra in MayIndia · 63 kmHigh 37.9°C · Low 26.4°C · 28 mm rain
- Deoria in MayIndia · 65 kmHigh 37.7°C · Low 26.1°C · 34 mm rain
- Bettiah in MayIndia · 66 kmHigh 36.5°C · Low 25.5°C · 53 mm rain
- Mothīhāri in MayIndia · 73 kmHigh 36.6°C · Low 25.7°C · 84 mm rain
- Kushinagar in MayIndia · 74 kmHigh 37.4°C · Low 25.8°C · 42 mm rain
- Arrah in MayIndia · 80 kmHigh 38.3°C · Low 26.6°C · 26 mm rain
- Buxar in MayIndia · 81 kmHigh 39.0°C · Low 26.8°C · 18 mm rain
- Mau in MayIndia · 85 kmHigh 38.7°C · Low 26.6°C · 19 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Siwān) is explained once on the Siwān year overview and on the Sources, method and limits page.