Islamabad month by month — at a glance
1991–2020 normals. Hover each month for the summary.
Islamabad has two seasons that are almost never called by their scientific names, but that govern the year almost entirely: before the monsoon and after the monsoon. With 1,261 millimetres of annual rainfall, it is not an especially rainy city by global standards, but that figure is far from evenly spread: July and August together account for 627.6 millimetres, almost exactly half the year's total.
01 A year split in two by the monsoon
The 1991–2020 normals draw a very clear pattern. From November to February, the city is cool and practically dry. From March to June, the heat rises quickly and rainfall stays low. And from July to September, the monsoon arrives: the temperature drops slightly from the June peak, but humidity and rainfall rise dramatically.
The four moments that define the year
18 mm and a 25.4 °C high. Clean air, long views towards Margalla and nights already cool.
38.3 °C mean high, with records up to 46.6 °C, and still without the rain that eases August.
317 mm of rain and humid heat. The absolute peak of the monsoon over the city.
34 mm and 30.9 °C. The monsoon has already left and the extreme heat has not yet returned.
02 May and June: the heat arrives before the rain
The most common mistake is to assume that heat and rain arrive together. In Islamabad they do not: May and June are the hottest months of the year — 36.1 and 38.3 °C mean highs respectively, with an all-time record of 46.6 °C in June — and at the same time among the driest, with barely 40 and 78 millimetres. The monsoon has not yet arrived to cool anything down.
That means the worst stretch of the year is not the rainiest one, but the one that precedes it: extreme, dry heat, without the humidity of the monsoon but also without any relief from water. It is the window most worth avoiding if the trip is not strictly necessary on those dates.
Heat here does not announce the rain. It burns itself out alone, weeks before the monsoon arrives to take over.
03 July and August hold more than half the water
When the monsoon arrives, it does so with force: 310.6 millimetres in July and 317.0 in August, with storms that can be intense and sudden. The temperature drops a little from the June peak — 35.4 and 33.9 °C mean highs — but the humidity rises so much that how it feels does not improve much.
The compensation is the landscape: these are the months when the Margalla hills are at their most intense green, fed by the monsoon itself. It is the same trade-off as in much of South Asia: water in exchange for colour, with storms that can upend a day's plan with barely any warning.
04 October and November are the window almost nobody mentions
With the monsoon already withdrawn and the extreme heat still far off, October and November offer the most balanced combination of the year: 30.9 and 25.4 °C mean highs, with only 34 and 18 millimetres of rain. November, in fact, is the driest month of the whole calendar.
It is also when the air is at its cleanest: without the humid haze of the monsoon or the load of dust and pollution that builds up in the dry hot months, the views from the Margalla trails reach further and with more clarity than at any other point in the year.
05 How to decide based on what matters to you
If your priority is the balance between pleasant temperatures and minimal rain, October and November are the clear answer. If you prefer the intense green of the mountains and can accept sudden storms, July and August offer it in exchange for humid heat. And if your only variable is avoiding water at all costs, December to February delivers, though with considerably colder temperatures at night.
The year in one sentence: in Islamabad heat and rain do not arrive together, but in two waves separated by weeks, and the best time to visit is precisely the calm gap left once both have passed.
