Historical weather data, all-time temperature records, and monthly climate averages for Portales, NM. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Portales tends to be a pleasant spring day, with average highs near 73° and lows around 37°. That said, the date has a wide range — a scorching 90° in 1946 and a brutal 14° low in 1973 show how unpredictable the high plains can be this time of year. Rain is unlikely, with only an 8% chance of any precipitation.
Portales plays for keeps at the extremes — the all-time high of 109° in June 1924 and an all-time low of -18° in January 1947 give this eastern New Mexico town a temperature swing of 127 degrees over its recorded history. A single August day in 1952 dropped 5.15 inches of rain, a reminder that late-summer monsoon events here can be intense.
Portales runs warm and dry for most of the year, with highs climbing into the low 90s from late June through August and bottoming out around 52° in early January. If you're chasing the best weather, April through May offers mild highs in the 70s and 80s before the summer heat arrives. August is the wettest month by far, driven by monsoon moisture pushing up from the south.