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Siwān Weather by Month
Average temperatures, rainfall and humidity for Siwān, India, month by month, built from OpenWeather’s historical records. Use it to see what a typical Siwān month looks like before you travel — then check the live Siwān forecast for the days ahead.
Warmest month
May
40°C average high
Coolest month
January
10°C average low
Wettest month
July
178 mm of rain
Driest month
February
13 mm of rain
Average temperature and rainfall in Siwān by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 22°C | 10°C | 4°C / 31°C | 49 mm | 67% | 9 km/h |
| February | 25°C | 12°C | 7°C / 35°C | 13 mm | 58% | 10 km/h |
| March | 33°C | 18°C | 9°C / 41°C | 15 mm | 38% | 12 km/h |
| April | 38°C | 23°C | 17°C / 45°C | 13 mm | 31% | 14 km/h |
| May | 40°C | 27°C | 18°C / 47°C | 27 mm | 41% | 14 km/h |
| June | 38°C | 28°C | 23°C / 48°C | 91 mm | 56% | 14 km/h |
| July | 34°C | 27°C | 24°C / 42°C | 178 mm | 71% | 15 km/h |
| August | 34°C | 26°C | 23°C / 39°C | 148 mm | 76% | 12 km/h |
| September | 33°C | 25°C | 21°C / 39°C | 120 mm | 77% | 11 km/h |
| October | 32°C | 21°C | 15°C / 39°C | 46 mm | 63% | 8 km/h |
| November | 29°C | 17°C | 9°C / 34°C | 38 mm | 52% | 8 km/h |
| December | 24°C | 13°C | 5°C / 31°C | 52 mm | 58% | 8 km/h |
Best time to visit Siwān
The most comfortable time to visit Siwān is generally December to February, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around July, totalling about 789 mm a year.
Travellers who prefer heat should aim for May, when highs average 40°C. July is the month to avoid if rain would spoil your plans — it averages 178 mm, roughly 14× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Siwān forecast for what is happening now.