The temperature sweet spot
Most guests are comfortable outdoors when the temperature is somewhere between the mid-60s and the mid-80s Fahrenheit. That's the range we use to count patio-friendly days for each city. Below it, you need heaters and guests want to be in the sun. Above it, you need shade, fans and an indoor backup — and lunch suffers more than dinner, because evenings cool off.
Two refinements matter more than the exact numbers:
- "Feels like" beats the thermometer. A 62°F afternoon in full sun with no wind can feel warmer than 70°F in the shade with a breeze. Know which parts of your patio get afternoon sun.
- Guests judge weather against what they're used to. 60°F in March feels like a gift and fills patios; 60°F in September feels like the end of summer. The same forecast means different things in different seasons.
Humidity: the hidden patio killer
Relative humidity is a confusing number. Meteorologists prefer the dew point, which tells you how much moisture is actually in the air. A handy rule of thumb:
- Dew point in the 50s: comfortable.
- Around 65°F: sticky — most people start to notice it.
- 70°F and up: oppressive. Guests will move inside even when the temperature seems fine.
On a muggy evening, fans do more than misters, and offering indoor seating proactively keeps the table instead of losing it. Our weather glossary explains dew point and other forecast terms in plain English.
Wind: the reason umbrellas come down
Wind is the most underrated patio factor. A steady breeze of 15 mph or more blows napkins and menus, chills guests, and makes market umbrellas a hazard. Gusts matter more than the average — check your umbrella's wind rating and set a clear "umbrellas down" rule your closing manager can follow without calling you.
Forecasts list both sustained wind and gusts. If the forecast discussion mentions a front passing through with "gusty winds" in the afternoon, plan for it even if the morning is calm.
Storms: when to bring everyone in
The National Weather Service's rule is simple: when thunder roars, go indoors. If you can hear thunder, lightning is close enough to be a danger. Have a plan for moving patio guests inside quickly — where they'll sit, who carries what, and how checks get transferred — before the first storm of the season, not during it.
The "first nice day" effect
Many operators notice that the first warm, sunny weekend of spring is one of the busiest of the year — people have been waiting for it. The same thing happens on a clear day after a stretch of rain or cold. If the forecast shows the first 70-degree weekend coming, staff and prep for it like a holiday, have the patio cleaned and ready ahead of time, and tell your regulars it's open.
A simple patio checklist
| Forecast | Decision |
|---|---|
| 65–85°F, dry, light wind, dew point under 65°F | Open, and promote it. These are the days patios exist for. |
| 55–65°F, dry, sunny, light wind | Open with heaters, seat sunny tables first, offer blankets. |
| Above 85°F or dew point above 70°F | Open for evenings; limit midday seating to shaded tables, run fans. |
| Rain likely during service, or sustained wind above about 15 mph | Keep it closed or open a sheltered section only. Push takeout. |
| Thunderstorms possible | Open with a plan — and bring guests in at the first rumble of thunder. |
Rules of thumb, not hard limits — a sheltered courtyard, strong heaters or good shade all stretch them.
Know your season
How many patio-friendly days you get depends a lot on where you are. Chicago's patio season is short and intense; San Diego's barely ends; Phoenix flips the calendar, with its best patio months in winter. Our city weather pages show month-by-month patio days, rain and temperatures for 12 U.S. cities, from ten years of National Weather Service observations.
Sources
- National Weather Service: Lightning safety — "When thunder roars, go indoors".
- National Weather Service: Why dew point, not relative humidity, describes how humid it feels.