Boise, ID

NWS NDFD forecast low temperature for Boise.

Every year's low on each of the next 7 forecast dates at Boise — toggle a day below. The forecast line shows where it lands; the ringed bar is the coldest on record.

The hottest and coldest ever recorded at Boise in each calendar month, and for the whole 1875–2026 record — with the year each was set.

Records set or tied at Boise so far this year — through Aug 30.

Two more daily records, kept separate from the rankings: the warmest a night has ever stayed (record high minimum) and the coldest a day has ever gotten (record low maximum) — the flip side of the usual record high and low.

Normal low & low by month, from Boise's own 1991–2020 record. Today's normal low: 56°F · forecast is -4° vs normal.

Boise'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 Boise'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 Boise, coloured by temperature — 152 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 Boise — counted through Sep 4 each year, so you can see whether 2026 is running cold. Pick a threshold:

48 days ≤32°F so far in 2026 — tied for the 139th most in 152 years. Normal for this point: 68. Record: 108 in 1964.

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