Independent comparisons. We may earn from shop links. More info

How to stick a thermometer on a window

Updated: October 2026

You have a stick-on dial or a film-mounted digital, and you want it on the glass before the next wet morning, not on the kitchen floor a week later. How to stick a thermometer on a window comes down to the outside face of a pane you can see from a chair and reach without leaning out. The Products Compared editorial team took the steps from the six amazon.co.uk listings compared on 15 October 2026 and from UK reviews of pads that let go. There was no laboratory test. If you buy through our Amazon links, we may earn a commission at no extra cost to you. Which model to buy stays on the [window thermometer comparison](/hub/climate-measuring/window-thermometer). This page is the fit only.

You have a stick-on dial or a film-mounted digital, and you want it on the glass before the next wet morning, not on the kitchen floor a week later.

Our top picks

Faithfull Faithfull stick-on window thermometer

Best overall

Faithfull Faithfull stick-on window thermometer
7.2/10about £4.31
View offer
Brannan Brannan outside window thermometer

Rank 2

Brannan Brannan outside window thermometer
7.6/10about £5.95
View offer
Youshiko Youshiko YC779 digital window thermometer

Alternative

Youshiko Youshiko YC779 digital window thermometer
5.7/10about £18.99
View offer
On this page
  1. 1.Outside face, shaded pane
  2. 2.Clean, dry, and mild
  3. 3.When the pads fail
  4. 4.Stop if you cannot reach
  5. 5.The fit in one pass

Outside face, shaded pane

Stick it on the outside of the glass. The Brannan title is written for that: outdoor temperature, read from indoors. Faithfull's maker page says outside glass. On the inside face you measure the room. Use a pane you can touch without climbing. A kitchen window over the sink is the usual case. An upstairs bedroom goes wrong, because the pads, and on the Youshiko the battery door, are on the weather side. A firm stick in full sun still reports the warmed case. How that looks at noon is on the sun and shade page. Do not drill.

Clean, dry, and mild

The glass needs to be clean, dry, and free of grease before any film comes off a pad. Faithfull's page says a grease-free surface, the film off the pads, and a press onto the outside glass. The SYNKIGY bullets say clean, dry, and smooth, then press, with no tools. The Jiujuda9 bullets say smooth glass and no tools. A UK review of that four-pack describes four pads, one at each corner. None of those Amazon listings states how long you should wait before you trust the stick. Eva Solo's mounting sheet, for its own outdoor window thermometer and not for these listings, says surgical spirit rather than detergent, a mount above 10 °C, and 24 hours. That is that product's instruction, not a cure time printed for Faithfull, Brannan, or the multipacks. If it is raining, or the glass is frosted, wait. A Youshiko review says rain loosened the film. Press firmly, then leave the case alone.
Faithfull Faithfull stick-on window thermometer

Testsieger

Faithfull Faithfull stick-on window thermometer
7.2/10about £4.31
View offer

When the pads fail

Plan on a new pad. On the Faithfull, pads lose grip within a fortnight, after a few months, or after about a year, and the box has no spares. On the Brannan, one report says the adhesive let go within a few days, and one parcel arrived with no tabs. When a pad fails, clean the old residue off the pane and off the case, then use a fresh pad. The listings do not name a replacement tape. The Youshiko uses film, and the cell is a second job. The listing says one AAA is not included. Changing the cell means doing it on the glass or peeling the film and replacing the tape.

Stop if you cannot reach

Stop when the outside face is above safe reach. A ground-floor kitchen is a fair job for you. A first-floor window, with you leaning out to press a pad or to open a battery door, is the point where you leave it. A ladder against upstairs glass for a gauge at about £4.31 or about £18.99 is a worse trade than a slightly less convenient window. If the only way to the Youshiko's screws is to hang out of a bedroom, that digital was the wrong listing for that pane.

The fit in one pass

Outside face, grease-free and dry, a pane you can touch, then a firm press and leave it. Wait out rain and frost. Keep a spare pad, because the Faithfull and Brannan reviews say the first set ends. If the only glass is upstairs and you would have to lean out, use a lower window or leave that pane alone.

Common questions

How do you clean the glass first?
Take off grease and dust, and let the pane dry before the film leaves the pad. Faithfull says a grease-free surface. Eva Solo's sheet, for a different thermometer, specifies surgical spirit rather than detergent. That is one maker's method, not a step printed on the Faithfull or the Brannan.
Can you fit the pads in the rain or in a frost?
Wait for a dry spell. The SYNKIGY bullets ask for a clean, dry surface, and a Youshiko review says rain loosened the adhesive. Eva Solo's sheet says mount above 10 °C and leave the pads for 24 hours. The Amazon listings here do not state that wait, so do not treat 24 hours as their promise.
Will the pads mark double glazing?
The six listings do not say. They do not claim the pads are safe for every sealed-unit coating, and they do not say the pads void a window guarantee. If the glass is still under warranty, ask the installer before you stick anything to the outside face. Wiping the pane is not a promise about the coating.
What if the only pads fall off?
Clean the glass and the case, and fit a fresh pad. Faithfull reviews report grip lost within a fortnight, after a few months, or after about a year, and the box has no spares. A Brannan parcel in the reviews had no tabs. A fall can break the dial. The listing will not name the tape.
How do you change the Youshiko battery without losing the stick?
The listing says one AAA, and it is not in the box. You either open the battery door while the film still holds, which means reaching the outside face, or you take the unit down and replace the tape. If you cannot reach it safely, do not start.

Related pages

Window thermometer buying guide

Best window thermometer

Window thermometer

Digital vs analogue window thermometer: which to buy

Window thermometer inaccurate: sun, shade, and noon

Sources

Public UK sources used for this comparison. Listing prices, stars, and review counts are the amazon.co.uk dump dated 15 October 2026.

  1. Met Office — how we measure temperature (retrieved 15 October 2026)
  2. Met Office — make your own thermometer box (retrieved 15 October 2026)
  3. GOV.UK — controls on mercury-added products (retrieved 15 October 2026)
  4. Consumer Rights Act 2015, section 22 (retrieved 15 October 2026)
  5. Brannan data sheet 14/419/3 (retrieved 15 October 2026)
  6. Brannan — dial window thermometer (retrieved 15 October 2026)
  7. RHS — heating greenhouses efficiently (retrieved 15 October 2026)
  8. Thermometer World — dial window thermometer (retrieved 15 October 2026)