Official Real Weather Report Topic

I wonder how much people's expectations from the weather system vary depending on where they live.

 

Your first date is September, the second one October. So it is very likely that the sim switched the foliage from summer to autumn. Each season has its own set of foliage and there must be a certain date where it changes from one to the next. You hit it.

 

Thanks guys. It was strange when I was looking for a date where the track temperature would average 30°C and the foliage would be greener. Even though it's likely the same as in my hometown, where you can experience all four seasons in a single day, I found the variation from day to day (~6°C ambient temperature) and the track temperature from 38°C to 14°C, under the same conditions, very strange.

 

Not to belabour this topic, but a 6C change in one day is typical even in places without four full seasons.

Last week where I live, the temp changed from 34C in the late afternoon to 14C in the late evening--a 20C drop in the space of a few hours. Most of the continental world that is not right beside a moderating ocean experiences large temperature swings on a regular basis. In many desert areas, 20C or 30C swings happen every day/night cycle.

As mentioned above, the game is a racing sim, not a weather sim, so it won't always be pin-point accurate, but instead hopefully introduces the possibility to experience the range of realistic weather for each track (location). That's about all we should expect.

 

Real Weather Bug – 1996 Brazilian GP (Interlagos) Weather Offset

Hi everyone, here is my report for the 1996 Brazilian Grand Prix at Interlagos.

Issue: When setting up a race to replicate the 1996 Brazilian GP (race start at 13:00 local time), the weather does not match historical conditions. In reality, the race started under torrential rain, but in-game, the weather is only “Heavy Cloud” with a dry track.

Steps to reproduce:

1. Select the 1993 Interlagos GP track
2. Set the session start time to 13:00 local time. Custom date is 31 March 1996
3. Enable Real Weather.
4. Start the session: the weather is “Heavy Cloud” and the track is dry, instead of the expected heavy rain.

After some testing, it appears the storm arrives around 16:00 in-game, which is several hours after the actual race start.
The weather should reflect the historical conditions at 13:00 local time, i.e., heavy rain and a wet track. This issue suggests a time offset in the Real Weather data for this specific event.
Thanks for your attention, and keep up the great work!

 

Just a side note by someone who never used Real Weather:
Interlagos is located at UTC -3

 

I think I had reported this issue months ago on the beta forum, but real weather is not working on custom championships, it turns off weather progression so no matter what time progression you use it never transitions.

 

I feel like this may not be 100 % accurate. I've definitely had real weather races in custom championships that went from dry to rain or the other way around.

The most recent example I have in a replay is from 31.10.2025. The championship in question was made after the Diablo Super Trofeo was added. It had 2x progression with real weather. The 1-hour race started with "Heavy cloud" and a "Dry" track state. The weather in the replay HUD changes to "Light rain" with about 25 minutes left, and I turn on my wipers with 7 minutes left.

Not saying it's impossible for there to be issues though. I just feel like we need more info.

I just started a new championship after 1.6.8.5 release with real weather and 5x progression. I'll try to remember to report back later. The first race was rain from start to finish, but that's entirely possible for real life weather to do, so I'll have to do some more racing before drawing conclusions.

 

Did another test and its not transitioning, in fact in the sessions page you can see the weather progression defaults to off no matter the settings you use.

Below the weather after one hour and forty minutes on qualify in the single race weekend option, it transitioned from rain to overcast and then light rain after 2 hours.


Here is the weather after 2 hours on the same date and settings but in custom championship

It never did the transition from the starting rain weather conditions, below the sessions page showing the weather progression on off.



If you use random weather slots it does transitions even though the sessions page says its off, its the real weather option that's bugged.

The track temps are also off, they are based more on the date/time than the actual cloud cover/weather conditions, you can see how the race started with a track temp of 76F but even thought it kept raining it went up to 82F.

I just hope Reiza gives some love to the real weather/live track in future updates, because as good as it looks and the "potential" it has, it's behind both Iracing and LMU on how realistic it is. The track dries too quickly in AMS2 compared to real life even when using the real time progression, so the drying line disappears too quickly and unrealistically.

 

First, I would not expect RealWeather to work if time progression is not 1.0x. I am just saying that as a user expectation since RealWeather implies you want authentic and realistic weather for the date and time that you select. The only way this is feasible is with normal time progression. If you want to accelerate time for whatever reasons, you would also need to pick your own weather.

The game does not support 60 weather slots, which is what would be required for a 2-hour 30x race. The RealWeather, like everything else in the game, is based on hourly changes. We get one new weather pattern per hour (either from the weather server or database or our own selections). If offline, we can play around with multiple slots per time period so the weather changes more frequently, but even that is often unrealistic and could not be considered "Real." If the game was a weather simulator instead of a race simulator, upping the polling time for weather changes from 1 hour to every 15 minutes or even 5 minutes could resolve all this, but a major change to the game operations would be required.

Also, why do you have two "Race 1" slots with "Q" icons? Those look like issues that should be addressed for all users.

 

I used the 30x time progression for testing purposes as the real weather does transitions by the in game "time" no matter the speed (it might loop and repeat if the race exceeds in game 24 hours, I dunno). The problem is that real weather is not transitioning those 1 hour slots on a custom championship, but it does in a single race weekend with the same settings, so there must be something that's preventing real weather to work properly in a custom championship.

 

The real weather in my custom championships seems to be working though, based on the replay I checked earlier and my memory from past experiences, so what is the difference between our setups? Could it be connected to specific locations and/or dates?

Just to confirm, this is a problem for you in race sessions too? Not just quali? I'm thinking of race sessions in my case. My quali tends to be short enough that I never really paid attention to weather progression, although I do have it set to real weather at 2x in my recent custom championships.

I think I'll try to get a race or two done today to check the 5x race weather progression championship. I'll probably grab screenshots of the championship setup while at it.

The weather progression information on the sessions tab seems like something that should also be reported on the HUD thread if it hasn't been yet.

 

Second 5x race done. The track was Santa Cruz do Sul, date 01/02/2023, race length 1 hour. The weather was clear skies throughout. I'm still considering this inconclusive due to the small sample size. Some random'ish observations below.

The start screen and end screen of the live session showed the same weather information at the top despite the numbers being different in the replay and Crew Chief also announcing temperature changes during the race.

Start:

Finish:


The replay starts with 6 kph, 25 C and 31 C instead of the information from the live session pre-race screenshot. The replay shows temperatures dipping to 24 C & 27 C during the night and going up to 27 C & 36 C when the sun rises, but I assume that to be a result of time progression, not weather progression. The wind speed dips to 5 kph just enough to show that it's not a static value.

The sessions tab showed weather progression as "Off" for me in this race, but I don't know if that's the same it's always been since I've never really checked it before.

I won't draw conclusions from this regarding the functioning of weather progression yet, and will report back after future races.

Timeanddate.com says the weather for 00:00 - 06:00 in Santa Cruz do Sul was clear. The next six hours partly sunny. Matches well enough with a fully clear race from 02:00 to 07:00.