Historical weather data, all-time temperature records, and monthly climate averages for Portage, MI. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Portage typically sits right on the edge of spring, with average highs of 53° and lows still dipping to a chilly 31°. The date has seen wild swings over 91 years of records — from a balmy 78° in 1997 to a brutal 12° low back in 1982. There's a 44% chance of rain, so don't leave the umbrella at home.
Portage has seen some genuine extremes over its nearly century-long record. The thermometer has swung from a scorching 108° in July 1936 all the way down to -21° in January 1951 — a jaw-dropping 129-degree range. On the wet side, a single September day in 2008 dumped over 6 inches of rain, and a January 1967 snowstorm buried the area under 18.1 inches in one shot.
Portage earns its warmest weather in mid-July, when highs average 86°, and bottoms out in mid-January with highs barely cracking 31°. If you're rain-averse, late June is statistically the wettest stretch of the year, averaging just over an inch of precipitation per week. For the most pleasant visit, aim for late May through early June or September, when temperatures are comfortable and the wet season hasn't fully arrived.