Historical weather data, all-time temperature records, and monthly climate averages for Sulphur, LA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Sulphur lands in that sweet spot of spring — average highs of 74° and lows of 55° make it one of the more comfortable stretches of the year. There's a 1-in-4 chance of rain, though history swings wide: this date has seen a sultry 89° (1982) and a teeth-chattering 39° low (1987).
Sulphur plays for keeps when the weather turns extreme. The all-time high hit a scorching 109° in August 2023, while January 2025 delivered a 6° low and 5.5 inches of snow in back-to-back historic cold events. The wettest single day on record — 15.67 inches in May 1980 — is a reminder that southwest Louisiana can get absolutely buried in rain.
Sulphur runs hot and long: highs climb into the upper 80s by June and stay near 92° through early August before easing off in the fall. If you're planning around comfort, April through May and October are the sweet spots, with highs in the 70s and 80s. Late August into early September is the wettest stretch of the year, averaging nearly two inches of rain in a single week.