Historical weather data, all-time temperature records, and monthly climate averages for Port Saint John, FL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Port Saint John sits right in the sweet spot of spring, with average highs around 80° and lows near 59°. Historically, the date has seen some wild swings — from a scorching 92° back in 1923 to a jaw-dropping 37° low in 1944. Rain is unlikely today, with just a 20% chance of precipitation across 121 years of records.
Port Saint John has seen it all, from a brutal 19° freeze on January 26, 1905, to a sweltering 103° on June 5, 1985. On the wet side, a single October day in 2025 dumped 13.1 inches of rain — a reminder that hurricane season here is no joke. This is a place where the extremes are real, not just statistical footnotes.
Port Saint John stays warm year-round, with highs never dipping below 71° even in the coolest weeks of January. Peak heat arrives in late July, when average highs reach 92°, and the wettest stretch runs late September into early October, averaging over 2 inches per week. If you're planning a visit, spring and early summer offer the best balance of warmth and lower rain chances.