homeassistant

I use the air quality measurement devices from Air gradient. https://www.airgradient.com/

Really well made and everything is open source. I flashed esphome on it and it works great but a new official firmware version from airgradient has HA support built in.

They have indoor and outdoor devices, I have both.

Ecowitt has been really good. I've had my station for two years now. Great equipment.

I use Aqara zigbee sensors—they cost under $20 and measure temperature, humidity, and air pressure. I’ve been using one outside (in a covered location) for over a year with no issues.

I use the round version of the same Tuya temperature sensor in my refrigerator and with Home Assistant. For $4 I wouldn't hesitate trying one in a protected area outside. As long as it's not directly exposed to rain or sun it'll probably work fine.

Late to the party but I use several from third reality for temp/humidity both indoor and out. They're ZigBee based and I just have a little ZigBee dongle attached to my server. Basically no setup needed once the dongle is up. Just add batteries and then add them in HA.

I use an Ecowitt weather station and sensors inside and out.

And I use weewx on a Raspberry Pi to publish that data. Weewx also has a mqtt plugin so I created a weather topic and transmit all the sensors onto it.

Then I created all those sensors in HA :)

Unless you're a weather nerd and wanna go that route there's probably better ways. I was already using Ecowitt devices independent of my smart home stuff.

A number of esp32 based devices have temp sensors too. Or gpio pins to add a 1wire or 3wire sensor.

Those are designed for indoors. I don't have any experience with them, but they might not survive the harsh conditions of being outdoors... especially water intrusion if they get rained on. They might be fine if placed directly under an awning or soffit.

My favorite temp sensors, by far, are one of a few that you can hook up to a LOLIN D1 Mini or other ESP type board. This is temp sensors on hard mode, though. You have to buy the various parts, solder them together (read further for a no-solder option), and then flash software onto it. The software I use is Tasmota, but ESPHome is another popular option. Both integrate directly with HA.

The downsides to this is each D1 Mini needs a 5v power supply (phone charger, for example). The new ones are USB-C. I don't know of a good battery option for these boards. These are wifi devices use more power than z-wave or zigbee.

Sensors that I've had good luck with are DS18B20 (also available in a waterproof version), and if you want something really good that includes humidity and barometric pressure, then BME688 is top of the line. The board that the BME688 comes on still needs a D1 Mini to hook up to. They are easier because you can use one of these cables to connect it to the D1 Mini, so no soldering required.

You can even go a step further and 3D print an enclosure for the electronics.

I know it's not what you asked for since you're looking for outdoor sensors, but maybe someone will find it interesting.

I'm using shelly sensors which work well with HA

If you want some honest advice: just use an internet source.

Unless you are a buying a scientific weather station to host at your home, none of the Ali* sensors will withstand what you're expecting.

Either pay for the real thing and get results, or skip on the cheap junk that will almost certainly die in a few months with no warranty or recourse...just use a close weather station.

For the most part I use SHT-35s with esp chips, although I got the Govee sensors with a base station for our reptile enclosures.