Weather in Trujillo in September

The month to avoid. Of the twelve, September is the one to avoid. Daytime highs average 37.5 °C and the afternoon is not negotiable — outdoor plans move to early morning or evening.

September ranks 12 of 12 — near the bottom of Trujillo's year. February is the month that works, and the swing between the two is 18 points, which is a different holiday rather than a slightly better one.

Rain falls on only 1 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for heat management rather than style: shade, water, and a schedule that gives up on the middle of the day.

What the averages hide

Averages flatten a month, and this one hides a few things: 28 days of the month clear 35 °C — that is not a heatwave, it is the month. Across the twenty years measured, the hottest September day reached 40.2 °C and the coldest night fell to 21.8 °C.

September is dependably dry, and that reliability is the point: across the twenty years measured, the wettest September on record still only managed 14 mm, and the driest managed 0 mm. There is no meaningful variability to plan around, which makes this one of the few months anywhere that you can build a fixed outdoor itinerary against without a fallback. The wettest single day in twenty years of Septembers brought 9 mm. Rain simply is not the variable that decides this trip — heat, crowds and cost are.

Wind is light at 8 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 56%.

How September sits in the year

Temperatures hold steady either side: 37.8 °C in August, 37.5 here, 36.3 in October. Nothing about the timing within the month matters much.

Daylight in September

Trujillo sits close enough to the equator that daylight barely moves all year — 12 hours in September, against a range of just 0.9 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 17.6 °C in September — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. The sea peaks at 23.8 °C in February and bottoms out at 17.6 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

September in Trujillo versus nearby

If Trujillo is one option among several, the nearby comparison is worth making. Piura is a better bet in September — 4.4 °C cooler, 1 day less rain. Lima is a better bet in September — 8.8 °C cooler, 1 day less rain.

So: September works, with February the better month by 18 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Trujillo

See all twelve months in Trujillo, or where else to go in September.