Weather in Tucson in January

Prime time. January is about as good as Tucson gets. Highs average 19.4 °C, lows 5.1 °C, and rain falls on 4 days — nothing in the month is working against you.

January ranks 4 of 12 in Tucson: past the worst of the year but short of March, which is the month to book if the dates are open.

Rain falls on only 4 days, so an itinerary with no wet-weather fallback is a reasonable risk. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average January reaches 30 °C. Across the twenty years measured, the hottest January day reached 27.9 °C and the coldest night fell to -4.5 °C, and the wettest single day dropped 38 mm — roughly 158% of the month's rain in one day.

This is the volatile part. January rainfall has ranged from 0 mm to 86 mm across the twenty years measured — a 86 mm spread around an average of 24 mm. The average is real but almost no individual January looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 8.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 49%.

How January sits in the year

Temperatures hold steady either side: 18.9 °C in December, 19.4 here, 20.7 in February. Nothing about the timing within the month matters much.

Daylight in January

January sits at the dark end of Tucson's year — 10.3 hours of daylight against 14.2 at midsummer, gaining 0.5 hours across the month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

With no coast nearby, the year swings a fair way — 34.5 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage. At 759 m the air is thin enough to matter — sun that burns faster than the temperature suggests, and nights that cool off quickly. Within January itself the daily swing is 14.3 °C, so mornings and afternoons need different clothes.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

January in Tucson versus nearby

If Tucson is one option among several, the nearby comparison is worth making. Phoenix is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Sedona is the weaker option in January — 7.4 °C cooler, 2 days more rain.

So: January works, with March the better month by 7 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Tucson

See all twelve months in Tucson, or where else to go in January.