Climate Insights for Siraha

The climate in Siraha is hot. The average annual temperature is 25°C and approximately 1195mm of precipitation falls per year. July is the wettest month, receiving around 332mm of rainfall. Siraha is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, May, June. The coldest months are January, December, February, when temperatures can drop to 10°C.

Temperatures in Siraha vary considerably across the year, with a 26°C difference between the coldest and warmest months. April is the hottest month, with daytime highs reaching 36°C and an average of 29°C. January is the coolest month, with minimum temperatures around 10°C and an average of 15°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between February and March, with a 5°C shift in average temperatures.

Siraha is a moderately rainy area, receiving approximately 1195mm of precipitation annually, which averages out to around 100mm per month. The wettest month is July, averaging 332mm of rainfall. August and September also tend to see above-average precipitation. The driest month is November, with just 0mm. That's 331mm less than July, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Siraha is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 8km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 11km/h in winter, 16km/h in spring, 14km/h in summer, 10km/h in autumn.

It is currently spring in Siraha, which began on March 20, 2026. Siraha is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in April at around 36°C, while the coldest stretch bottoms out in January near 10°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Siraha is during January, February, March, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 8mm per month. By contrast, April can be uncomfortably hot with temperatures reaching 36°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Siraha based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.