Pakistan's Meteorological Department now publishes, in the same bulletin as its temperature and humidity averages, the conditions under which mosquitoes will turn three weeks of warm wet weather into a dengue season. The April 2026 outlook flagged a wetter, warmer monsoon, and 10 cities are watching. Pakistan in 2026 is running a forecast-driven dengue programme, not a reactive one.
The headline number from Pakistan's April climate report is not the rainfall. It is the lag. The Pakistan Meteorological Department now publishes its temperature and humidity averages. Alongside them, it publishes the conditions under which mosquitoes can turn three weeks of warm wet weather into a dengue season. The thresholds are specific: 26 to 29°C sustained for three to five weeks, relative humidity above 60%, and rainfall above 27 millimetres. The same office that tells farmers when to sow reads them.
This is not new science. It is a new administrative habit. In a country that lost the post-monsoon period to dengue in three of the last four years, the habit is starting to look like infrastructure.
What the April 2026 report actually says
The PMD's April climate summary, published in early May, recorded a national average rainfall of 41.1 millimetres, 65% above normal. Sindh ran 169% above its April average. Punjab ran 109%. Khyber Pakhtunkhwa ran 48%. Only Gilgit-Baltistan finished below the long-run mean. The highest temperature of the month was 47.5°C at Shaheed Benazirabad. The heaviest rainfall, 283.6 millimetres, fell at Parachinar.
The outlook for May to July points to below-normal rainfall in southern Pakistan, with above-normal rainfall in the north. The report warns of possible flash floods and landslides in the northern areas, and of heatwave conditions in southern Punjab and Sindh.
One line in that seasonal outlook would have read as a non-sequitur in a weather report a decade ago. It says: "Health risks such as the spread of vector-borne diseases, including dengue, are also expected to rise due to warmer conditions."
That sentence is the operational handoff. From there, provincial health departments pick up the file.
The Met Office's dengue rulebook
The PMD's dengue advisory names ten cities as the country's high-risk grid: Karachi, Lahore, Peshawar, Rawalpindi, Islamabad, Hyderabad, Faisalabad, Sialkot, Larkana and Multan. The post-monsoon outbreak window runs from 20 September to 5 December. The forecast logic is simple. A three-week stretch in the 26-29°C band, with humidity above 60% and rainfall above 27 mm, lets Aedes aegypti populations climb. The three-week lag for the egg-to-biting-adult cycle can then push the case count past clinical capacity.
The same advisory notes that the mosquitoes are most active in the two hours after sunrise and the two hours before sunset. Breeding stops once the temperature falls below 16°C. The thresholds are specific enough for provincial teams to act on.
What the Met Office does not do is announce outbreaks. It announces the conditions for outbreaks, and leaves the field response to provincial dengue control units and the National Institute of Health. The result is a calendar Pakistan's health system can plan against, covering fumigation, larvicide stocks, surveillance staffing and hospital readiness, months before the first cases arrive.
The 2025 baseline and the 2026 pivot
The recent record is the relevant context. Khyber Pakhtunkhwa confirmed 6,116 dengue cases and four deaths in 2025, a figure published in November 2025. As temperatures fell that month, the province's daily infections dropped from 23 to six, with one hospital admission.
National totals are larger. An advisory from Pakistan's National Institute of Health, cited by Arab News, recorded about 79,000 confirmed dengue cases and 149 deaths in 2022. In 2021 it recorded about 52,900 cases and 224 deaths. In 2017, WHO published a detailed account of its support to the Khyber Pakhtunkhwa government. The outbreak involved more than 95,000 suspected cases, including more than 20,000 laboratory-confirmed cases and 61 deaths. WHO's country office trained medical officers in case management and deployed entomologists for vector control.
Then, in February 2026, KP's Minister for Health Khaliq-ur-Rehman convened a province-wide planning meeting. Two positive cases in Kohat district triggered the Dengue Action Plan 2026, before any 2026 cases had arrived in volume. Within a few weeks the province had inspected 94,000 households and 183,000 standing-water containers and reported zero dengue larvae. Rapid response teams were activated at district and tehsil level, and hospitals were directed to keep dengue diagnostic kits, isolation wards and trained staff ready.
This is the pivot worth noticing. Pakistan in 2025 ran a reactive dengue programme. Pakistan in 2026 is running a forecast-driven one. The Met Office issues the conditions, the provinces deploy on a schedule, and the action plan exists before the first patient.
Why it matters beyond Pakistan
Vector-borne disease forecasting from a national meteorological service is rare. Pakistan's arrangement, one office, one bulletin and one threshold list, is the kind of institutional coordination that public-health planning calls for. It is happening because early warning gives the health system time to act before cases rise, not after the wards start to fill.
Higher-income countries now record their first locally acquired dengue and chikungunya cases each summer, including in southern Europe. The lesson is not to copy Pakistan's specific 26-29°C thresholds. It is the integration. Climate offices already model the weather that creates the disease. Letting them publish that link, in the same bulletin as the forecast, costs little.
What to watch next
The PMD's May 2026 climate report will land in early June and is the first integration test of the new outlook style. Does the predicted heatwave-plus-rain pattern in southern Punjab and Sindh manifest, and do provincial health departments respond before the post-monsoon window opens on 20 September? Khyber Pakhtunkhwa's larva-count audit is the cleanest indicator. Zero dengue larvae across 183,000 inspected containers in February is a real number; the question is whether it holds through July's water-storage spike.
The deeper story is that climate adaptation in public health increasingly means changing which office talks to which. Pakistan's Met Office is now in the room when KP plans for September. That is the part to watch.
What we know
Sources cited
- Pakistan Meteorological Department, operational portal · https://www.pmd.gov.pk/
- Daily Qudrat, PMD April 2026 climate report and May to July outlook · https://en.dailyqudrat.pk/82368/
- Business Recorder, report on the PMD outbreak thresholds · https://www.brecorder.com/news/40382854/severe-dengue-outbreak-feared-in-karachi-lahore-eight-other-cities-pmd
- Arab News, PMD advisory on the October dengue risk in ten cities · https://www.arabnews.com/node/2572859/pakistan
- PakTribune, "Dengue Cases Fall Sharply, But Alarming Warning Issued for 2026 Resurgence" · https://paktribune.com/dengue-cases-fall-sharply-but-alarming-warning-issued-for-2026-resurgence/
- The Nation, KP minister chairs meeting to review Dengue Action Plan 2026 · https://www.nation.com.pk/25-Feb-2026/kp-minister-chairs-meeting-review-dengue-action-plan-2026
- WHO EMRO, "WHO supports Government of Khyber Pakhtunkhwa to control dengue outbreak" · https://www.emro.who.int/pak/pakistan-news/who-supports-government-of-khyber-pakhtunkhwa-to-control-dengue-outbreak.html