Sioux City, IA

NWS NDFD forecast high temperature for Sioux City.

Every year's high 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 hottest 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 high & low by month, from Sioux City's own 1991–2020 record. Today's normal high: 81°F · forecast is +11° vs normal.

Sioux City's observed daily high 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 high, the normal, and the full span ever seen. A shareable look at where the year stands.

Each cell is one day's high 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 high at Sioux City — counted through Sep 5 each year, so you can see whether 2026 is running hot. Pick a threshold:

29 days ≥90°F so far in 2026 — tied for the 49th most in 138 years. Normal for this point: 25. Record: 66 in 1936.

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