Climate Insights for Sulphur

The climate in Sulphur is warm and mild. The average annual temperature is 21°C and approximately 1580mm of precipitation falls per year. Sulphur receives a notable amount of rainfall throughout the year, including during its driest month. Sulphur is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, December, February, when temperatures can drop to 7°C.

Temperatures in Sulphur vary considerably across the year, with a 26°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 33°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 7°C and an average of 12°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

Sulphur is a fairly wet location, receiving approximately 1580mm of precipitation annually, which averages out to around 132mm per month. The wettest month is May, averaging 185mm of rainfall. August and June also tend to see above-average precipitation. The driest month is November, with just 83mm. That's 102mm less than May, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Sulphur is relatively calm, with an average annual wind speed of 11km/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 13km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 12km/h in winter, 13km/h in spring, 9km/h in summer, 10km/h in autumn.

It is currently summer in Sulphur, which began on June 21, 2026. Sulphur 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 August at around 33°C, while the coldest stretch bottoms out in January near 7°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Sulphur is during October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 84mm per month. By contrast, August can be uncomfortably hot with highs reaching 33°C, while January is the coldest period with lows dropping to 7°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Sulphur 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.