Boston, MA

NWS NDFD forecast low temperature for Boston.

Every year's low on Jul 18 at Boston. The forecast line shows where today lands; the ringed bar is the coldest on record.

The hottest and coldest ever recorded at Boston in each calendar month, and for the whole 1872–2026 record — with the year each was set.

Records set or tied at Boston so far this year — through Jul 11.

Normal low & low by month, from Boston's own 1991–2020 record. Today's normal low: 67°F · forecast is -1° vs normal.

Boston's observed daily low for the last six weeks — a white ring marks any day that broke or tied its daily record for that date.

Every day this year against Boston's own record — the record low, the normal, and the full span ever seen. A shareable look at where the year stands.

Each cell is one day's low at Boston, coloured by temperature — 155 years of record, so heat waves read as warm streaks and cold snaps as blue.

How many days a year hit a given low at Boston — counted through Jul 18 each year, so you can see whether 2026 is running cold. Pick a threshold:

70 days ≤32°F so far in 2026 — tied for the 78th most in 155 years. Normal for this point: 70. Record: 96 in 1879.

A ready-to-share summary of Boston's outlook — post it, or link this page.