Pool swim season in Port Huron, MI

When can you swim in an outdoor pool in Port Huron, MI?

An unheated pool in Port Huron never reaches 78°F in a normal year. It peaks around 75°F in Aug. The air allows up to 4 swimmable months with a heater (Jun to Sep).

1. J
2. F
3. M
4. A
5. M
6. J
7. J
8. A
9. S
10. O
11. N
12. D

What each heater buys you in Port Huron

For a 450 sq ft pool held at 80°F, at MI prices of 21.7¢/kWh electricity and $11/Mcf gas. All-in spreads the purchase over the equipment's life.

The cheapest way to the full season in Port Huron

Solar panels + cover: 4 of 4 possible months for about $283 a year all-in, which works out near $71 for each month it adds.

Before you pay for any heater, buy a solar cover: on its own it adds 2 months here for about $50 a year (why a cover comes first). If you get quotes, ask for gas as well as a heat pump: once the purchase price is counted, gas comes out cheaper all-in here (heat pump or gas).

Weather station: Port Huron, 1.5 mi away (NOAA 1991–2020 normals). Water temperature is estimated from air and sunshine, not measured.

Port Huron month by month: air, sun and pool water

Heating costs most in Jun (about $98 with a heat pump, $102 with gas). Sunshine peaks in Jun at 6.3 kWh/m²/day (NASA satellite data, 55.2 km grid cell). Highlighted months are swimmable with no heater.

How Port Huron compares with nearby cities

Port Huron ranks 18 of 90 Michigan cities for unheated swim months, and no nearby city gets a longer unheated season.