Historical weather data, all-time temperature records, and monthly climate averages for Severn, MD. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Severn sits right in the heart of spring's transition, with average highs of 61° and lows of 40° across 86 years of records. The date has seen some wild swings — from a balmy 84° in 2010 to a brutal 26° low back in 1964. Expect a roughly one-in-four chance of rain, but snow is essentially off the table.
Severn's weather has real teeth at both extremes — the thermometer has soared to 106° in July 2011 and bottomed out at -7° in January 1963, a 113-degree range that speaks to the Mid-Atlantic's dramatic seasonal personality. The all-time wettest day dumped 6.3 inches on August 12, 2014, and a single January storm in 2016 buried the area under 25.5 inches of snow.
Summers here are legitimately hot, with the warmest week of the year (July 16–22) averaging a high of 89°, while mid-January bottoms out near 41°. Late spring is the wettest stretch — the last days of May into early June average over an inch of precipitation per week. If you want warm but not sweltering, May and September, with highs in the mid-to-upper 70s, are your best bets.