Lower your Amazon bids on weekends? Check two periods first

A common piece of advice says that Amazon shoppers browse on weekends and buy on weekdays, so you should lower your bids on Saturday and Sunday. We checked it on real accounts. The weekend was worse in some accounts, better in others, and in most of them the gap was too small to act on.

The measured numbers below come from real accounts: 12 advertiser accounts in Europe, the UK and the US, 14 account and currency pairs in total, Sponsored Products campaign report, day by day, for 26 full weeks from Monday March 30 to Sunday September 27, 2026. We left out the last two weeks because ad-attributed sales are not final yet. Each day has 26 occurrences, so no day of the week is over-represented. We compared ratios only inside one currency, and account by account inside one account and currency. For the account comparison we kept the 8 pairs with at least 60 orders in the period. The other 6 had too few orders to judge. Below, "account" means one account in one currency.

The averages point in opposite directions

In the euro accounts, all together:

  • On weekdays, 5.30% to 5.80% of clicks became an order. On Saturday 4.98%, on Sunday 4.58%.
  • ACOS was 35.1% to 40.0% on weekdays, 42.7% on Saturday and 43.7% on Sunday.

In the pound accounts it was the other way round. Sunday (9.71%) and Monday (9.64%) had the highest conversion rate, Thursday the lowest (6.36%). Saturday and Sunday sold at 17.8% and 16.0% ACOS, Wednesday and Thursday at 20.9% and 22.5%. But of the 980 orders in the pound accounts, 907 came from one account, so this average is mostly that one account.

So "the weekend is weak" was true for our euro average and false for our pound average. An average over several accounts also mixes accounts that behave differently. That is why we looked at each account on its own.

The click costs about the same on the weekend

In 7 of the 8 accounts, the average click cost on the weekend was within 4.5% of the weekday click cost. One small UK account paid 11.8% less per weekend click, on 110 pounds of weekend spend. So where the weekend was worse, it was not because clicks got more expensive. Fewer of the clicks became orders.

The weekend took 27.5% to 32.4% of the clicks in the 8 accounts. Two days out of seven would be 28.6%.

Account by account

Comparing Saturday and Sunday against Monday to Friday over the whole period:

  • In 5 of the 8 accounts the weekend converted worse, in 3 it converted better.
  • The gap ranged from a third lower to a third higher conversion rate on the weekend.
  • Only 2 of the 8 had a gap clearly larger than chance would produce with that many orders.

Those 2 went in opposite directions. A UK account converted 19% better on the weekend and sold at 16.1% ACOS there, against 17.7% on weekdays. A euro account converted 33% worse on the weekend. It spent 1,298 euros on Saturdays and Sundays at 33.0% ACOS, against 22.9% on weekdays. For that account, the weekend is a real question. For the UK account, lowering weekend bids would have cut its best days.

Of the other 6 accounts, 5 had a weekend gap of 13% or less, in either direction. That is too small to separate from normal week-to-week swings. The sixth converted a third better on the weekend, but on 42 weekend orders that could still be chance, and it is one of the two accounts that flipped below.

The two-halves test

A pattern you can act on should repeat. We split the 26 weeks into two halves of 13 weeks (March 30 to June 28, June 29 to September 27) and compared again.

  • In 6 of the 8 accounts the weekend went the same direction in both halves.
  • In 2 it flipped. A US account converted 13% worse on weekends in the first half and 50% better in the second. A euro account went from 27% worse to 63% better.
  • Even the 2 accounts with a clear gap over the whole period had a clear gap in only one of the two halves. In the other half the direction held, but the gap could have been chance.

So a weekend rule set from three months of data could have pointed the wrong way in the next three months, in 2 accounts out of 8.

What we could not see

We did not test what happens if you actually lower weekend bids: you may lose ad placement, and with it some sales that the report never shows. We did not split out holidays or promotion days. We did not check whether a campaign ran out of budget earlier on some days, which changes the day mix. Single days per account (all Mondays, all Tuesdays) had too few orders to compare, so we only compared weekend against weekdays. And the report counts the purchases for 7 days after the click.

Check your own account in 30 minutes

  1. Download the Sponsored Products campaign report by day for at least the last 3 months, ending 2 weeks ago.
  2. Work per account and marketplace, never mixed. Sum clicks, spend and orders for Monday to Friday and for Saturday and Sunday.
  3. Compare the conversion rate (orders divided by clicks) first. Check that the click price is about the same. In our data it was.
  4. Split the period into two halves and repeat. Act only if both halves point the same way and the weekend side has at least 30 orders in each half. These thresholds are our suggestion, not a measurement.
  5. If both halves show a weaker weekend, lower weekend bids by less than the conversion gap, and after 4 weeks compare those 4 weeks the same way, weekdays against weekend. If both show a stronger weekend, do not lower them.

The weekend is not weak by default. In our data it was weak for some accounts and strong for others, so measure yours before you set a rule.