Sioux City, IA

NWS NDFD forecast low temperature for Sioux City.

Every year's low on each of the next 7 forecast dates at Sioux City — 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 Sioux City in each calendar month, and for the whole 1889–2026 record — with the year each was set.

Records set or tied at Sioux City 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 Sioux City's own 1991–2020 record. Today's normal low: 56°F · forecast is +10° vs normal.

Sioux City'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 Sioux City'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 Sioux City, coloured by temperature — 138 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 Sioux City — counted through Sep 7 each year, so you can see whether 2026 is running cold. Pick a threshold:

88 days ≤32°F so far in 2026 — tied for the 83rd most in 138 years. Normal for this point: 89. Record: 107 in 1950.

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