June is the month that breaks plans, because it alternates: 3 afternoons at 35°C, then 2 days at 80 percent humidity and 24°C. A fixed routine cannot cover both. What works is a trigger ladder — 4 thresholds you check, each with one action attached — so the flat changes state before the cat is in trouble. The thresholds: 35°C daytime high, 26°C overnight low, 70 percent indoor humidity, and 28°C food temperature.
Trigger 1: 35°C for 3 days
A heatwave in cat terms is 3 consecutive days at 35°C or above, or 2 nights where the low does not drop below 26°C. The night number matters more than the day number: cats dump heat by panting and by lying on cool surfaces, and both fail when the room never cools. Once triggered, move the cat's core territory to the coolest room, not the whole flat — a 12 m² room with a door is easier to hold at 27°C than 60 m² of open plan.
Cooling a room by 3 to 5°C is realistic with 2 actions: external blinds down before 10:00, and a fan pulling air out of a window on the shaded side after 21:00. A fan blowing directly on a cat does nothing above 35°C except move hot air; wet fur and airflow together do the work.
Trigger 2: 26°C overnight low
Two nights above 26°C is when cats stop eating. Appetite drops 20 to 40 percent in most cats above 28°C, and a cat that eats nothing for 48 hours starts mobilising fat, which in an overweight cat is the road to hepatic lipidosis. Weigh food: if the bowl comes back 50 percent full for 2 days, switch to 4 small wet meals and stop free-feeding dry food overnight, because dry food left out in humid air is the next trigger.
Trigger 3: 70 percent indoor humidity, and the wet food clock
Above 70 percent RH, kibble picks up moisture within 20 to 30 minutes and mould appears on exposed wet food in 24 to 48 hours. The practical rules are time-based, not smell-based — you cannot smell the early stage.
| Condition | Threshold | Action | Frequency |
|---|---|---|---|
| Indoor humidity | Above 70 percent | Dehumidifier to 50 to 60 percent | Check twice daily |
| Wet food, room temp | Above 28°C | Discard after 30 minutes | Every meal |
| Wet food, fridge | 24 hours max | Cover, then warm to 20 to 25°C | Daily |
| Dry food, open bag | Use within 4 to 6 weeks | Airtight 2 L container | Weekly check |
| Standing water | Any puddle over 24 hours | Drain, dry, disinfect | Weekly balcony sweep |
| Ear check | Every 7 days | 2-minute visual check | Weekly |
Refrigerated wet food loses aroma at 4°C, and a cat with a heat-suppressed appetite will refuse it. Take the portion out 15 to 20 minutes before the meal, or add 1 tablespoon of warm water, never microwave it — 60°C hot spots burn a cat's tongue on contact.
Trigger 4: the drainage sweep
June rain plus fur equals blocked balcony drains. A clogged 10 cm drain can hold 5 cm of standing water, and standing water at 25°C plus breeds mosquitoes in 7 to 10 days. It is also a drinking source: cats lap puddles, and standing water carries leptospira, giardia, and whatever the drain grate collected. Sweep the balcony drains weekly, lift the grate, clear hair, and flush 2 litres through. Empty any container that holds water for more than 24 hours — buckets, plant saucers, the base of a cat grass tray.
Keep the litter box dry in the same weather. Clumping litter at 70 percent RH absorbs moisture from the air, clumps soften, and a cat that dislikes the texture starts urinating 20 cm outside the box. Scoop twice daily instead of once, and top up with 2 to 3 cm of fresh litter every 3 days.
Ear checks: 2 minutes, once a week
Warm humid weather is fungal weather. A healthy ear canal is pale pink, odourless, and holds no more than a thin film of wax. Check weekly: look at both ears in daylight, smell them, and watch for head shaking more than 3 times in a minute. Wipe only the outer flap and the first 0.5 cm of canal with gauze and a vet-approved cleaner every 7 to 14 days; a cotton bud pushed past 0.5 cm packs wax against the eardrum.
See a vet within 24 to 48 hours for discharge that is brown, yellow, or black; a head tilt over 15 degrees; scratching that breaks the skin; or a swelling on the flap that fills within 48 hours (an aural haematoma). Never use tea tree oil, alcohol, or hydrogen peroxide in a cat's ear — all 3 irritate the canal and 1 is toxic.
What the 72-hour kit holds
Power cuts in June storms take out fans and fridges together. Kit: 4 litres of water per cat, 3 days of food, a battery fan with 8 hours of run time, 2 freezer packs, a carrier per cat, a copy of the vaccine record, and 7 days of any prescription. Store it in the coolest cupboard, not the balcony, and check the batteries every 90 days.
5 steps for the first humid week
- Write the 4 numbers — 35, 26, 70, 28 — on a card and stick it to the fridge.
- Buy a 20-unit hygrometer and log humidity at 09:00 and 21:00 for 7 days.
- Sweep and flush every balcony drain, then diarise it weekly.
- Do one 2-minute ear check on both ears, and photograph what you see as a baseline.
- Build the 72-hour kit and put a 90-day battery reminder in the calendar.
The full heat plan is in the heatwave cooling plan, rain-season drainage and storage in the monsoon checklist, and the monthly cost of cooling and dehumidifying is in the cost tool.
Frequently asked
At what temperature is it a heatwave for a cat?
Three consecutive days at 35°C or above, or 2 nights where the low stays above 26°C. The overnight low matters more, because a cat that cannot cool down at night starts the next day already overheated. Above 28°C, appetite typically drops 20 to 40 percent.
How long can wet food stay out in June?
About 30 minutes above 28°C, and less at 32°C. Refrigerated portions keep 24 hours if covered, then need warming to 20 to 25°C for 15 to 20 minutes before serving, because cold food loses aroma and a hot cat with a suppressed appetite will refuse it.
How often should I check a cat's ears?
Once every 7 days, for 2 minutes: look at both ears in daylight, smell them, and watch for head shaking more than 3 times a minute. Clean only the outer flap and first 0.5 cm of canal every 7 to 14 days, and see a vet within 24 to 48 hours for discharge or a head tilt over 15 degrees.