Weather swings tied to higher mental health demand

Clinical takeaway: Periods of low sunshine and warmer days may warrant some capacity attention in unscheduled mental health services.

Most research on weather and mental health has fixated on heatwaves and other extremes, which hit fast and leave psychological effects lasting weeks to months. This study asked a different question: whether ordinary day-to-day weather also moves how often people reach out for mental health support. Across more than 4.6 million NHS contacts in England over nine years, warmer days and, most consistently, low-sunshine days tracked with small increases in unscheduled demand, typically within hours to a few days. Rainfall showed no reliable effect.

Sunshine showed the clearest pattern. On the darkest days, unscheduled contacts rose by about 4% to 6% across all three services compared with a typical 10-hour day, a small but consistent lift that held with little regional variation. For specific conditions, fewer sunshine hours tracked with more GP out-of-hours and ED contacts for anxiety and depression.

Temperature tracked with demand up to about 18°C, then flattened or declined. NHS 111 calls and ED attendances were lowest in the cold and rose with warmth, with the gap between the low and high points around 20% for NHS 111 and 17% for ED. Among adults over 64, ED attendances followed a U-shape, rising in both colder and warmer conditions.

Rainfall showed no consistent association, with most estimates close to null.

The retrospective study drew on nine years of NHS syndromic surveillance data from across England, January 2014 through December 2022, covering more than 4.6 million unscheduled mental health contacts to the UK's National Health Service. Researchers paired daily contact counts with regional temperature, sunshine, and rainfall, then estimated associations.

What the study captures is people reaching out, not new cases of illness, and it shows everyday weather plays a role in addition to more extreme conditions. That distinction matters: the weather effect probably operates through distress and coping rather than disease incidence. The practical use is anticipating small, weather-linked swings in unscheduled demand, with emergency departments being the least predictable setting.

"Understanding factors that influence fluctuations in mental health–related healthcare demand is an important public health priority, and may help planning and preparedness efforts for mental health services under current and future climate conditions," said Richard Elson, PhD, of the School of Environmental Sciences at the University of East Anglia.

Source: Elson R, et al. (2026 Jun 30) Front Psychiatry. The effect of weather on unscheduled healthcare utilisation for mental health conditions in England, 2014–2022