Climate Insights for Siwāna

The climate in Siwāna is hot. The average annual temperature is 27°C and approximately 440mm of precipitation falls per year. August is the wettest month, receiving around 185mm of rainfall. Siwāna is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, June, April. The coldest months are January, December, February, when temperatures can drop to 11°C.

Temperatures in Siwāna vary considerably across the year, with a 31°C difference between the coldest and warmest months. May is the hottest month, with daytime highs reaching 42°C and an average of 35°C. January is the coolest month, with minimum temperatures around 11°C and an average of 18°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between March and April, with a 6°C shift in average temperatures.

Siwāna is a relatively dry area, receiving approximately 440mm of precipitation annually, which averages out to around 37mm per month. The wettest month is August, averaging 185mm of rainfall. July and September also tend to see above-average precipitation. The driest month is February, with just 0mm. That's 185mm less than August, 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.

Siwāna is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 3km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.

It is currently summer in Siwāna, which began on June 21, 2026. Siwāna 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 May at around 42°C, while the coldest stretch bottoms out in January near 11°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Siwāna is during January, February, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 1mm per month. By contrast, May can be uncomfortably hot with temperatures reaching 42°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Siwāna 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.