OvuSense logo

What is a Woman's Temperature when Ovulating?

Measuring your temperature is one of the best ways to determine ovulation. Unlike hormone-based testing kits, it remains a useful indicator and predictor even if you have a condition like Polycystic Ovary Syndrome or Hyperthyroidism. If a condition effects your hormones, it can disrupt your menstrual cycle, causing lighter or heavier periods, and making you skip or miss ovulation altogether! It’s a cruel irony that these conditions, that make it all the more vital for you to identify when you are ovulating, also make the easiest ovulation tester kits useless.

Temperature is a better indicator: a woman’s temperature really is affected by ovulation, and if you can detect those changes then you can unlock the key to understanding when you’re at your most fertile, and therefore when you have the best chance to conceive!

Taking Your Temperature

Unfortunately, such a useful measure of fertility isn’t easily available. You can’t, it’s sad to say, simply put a thermometer in your mouth or under your arm for thirty seconds and get an instant answer to your fertility questions.

One way of trying to get a more accurate prediction of your ovulation is by measuring your Basal Body Temperature (often abbreviated to BBT in fertility discussions). This is the low temperature your body drops to in extended sleep, as your metabolism slows. It’s at this base level that ovulation can cause small dips and spikes that let you know what your body is doing.

It means you need to take your temperature first thing in the morning to get as close to this base temperature as possible before your waking metabolism warms your body and swamps those small changes. OvuSense has an even better option: our specialised vaginal sensor tracks the fluctuations in progesterone that lead to temperature changes right through the night, ensuring you’re getting the most accurate result possible to inform your prediction. This also means that people who have irregular cycles or fertility issues can still get an accurate prediction, unlike with most BBT monitors that rely on previous data to predict future results.

What to Look For

The results you’re looking for are a pattern of drops and rises that indicate ovulation. These will be unique to you: everyone has a slightly different resting temperature, but what you’re looking for is the pattern of changes, not a specific number.

A woman’s core temperature before ovulation is, on average between 36.1C and 36.4C – what you’re looking for is a sudden rise to between 36.4C and 37C. For many people this rise is preceded by a drop, in which case you have an even stronger indicator: your average temperature, followed by a sudden drop, which is in turn followed by a sudden sustained rise to above average.


Interpreting the results can be difficult. You need to track your temperature across multiple cycles in order to identify your pattern with confidence. OvuSense can help here too: our algorithm takes its input direct from our sensor and processes this in an easy to use app. You will then be notified 24 hours in advance of your predicted ovulation date and with a 96% clinically proven success rate, giving you the best opportunity to conceive!

Find out more about core temperature technology and fertility here