Humidity In Week 4 Of Flowering Is Killing Me. I Need Help

Hi All!

So during the day my humidity is 48/50, but at night its going up to 66%. I put in a small dehumidifier & its down to 55/57%. I have a 2x2 tent, I added 2 tube heaters, 5inch extraction fan is on half (worried about noise) & my night temps are 25/26 but humidity is still high.
Max overnight humidity was 66%. I woke this morning & it was at 59%

WTF can I do or is it ok to have humidity that high for a few hours over night?

Any help from someone who has experienced this would be really appreciated. I have read loads before I started my grow & 60% & over is supposed to be really bad.

Thanks!

Depending on where you live if the air is very dry outside if you open a window to the room, then put a fan blowing air towards the window but not directly out of it, it will greatly reduce the overall humidity in your room without greatly losing heat. For example lights off regardless of outside temp my window is open 3/4 an inch, humidity stays below 45 about 65% otherwise drops to 27 if i turn humidifer off. Temps go from lights on 26 to lights off 22.

The fan causes a little vortext by the window not allowing cold air im (-13 celisus most mights here). But mixxing the air causing the room humidity to drop and no plants to shock

I really appreciate your reply!

Im in Ireland & its winter here & damp-ish the last few days. Im growing in a 2x2 tent. I've been moving it into my living room at night as I cant sleep with it in my bedroom.

Is 66% way to high for a few hours at night?

66% RH is fine....don't sweat it. Keep your air moving when the lights are on and you'll be A ok.

But I read anything above 60% is really bad. Sorry labouring the point, but I'd be sick if after getting them this far I loose them over high humidity

Ideally you want lower rh later in flower to prevent powdery mildew and mold, 66% is on the higher side but i dont think its critical

like canna said, keep air moving and it shouldnt matter that much.

I run all my fans 24/7 (exhaust and oscillating) to keep humidity in check.

Is your hygrometer under or in the light? If it is wrong place and why daytime humidity drops. Quite often the case with hygrometer and temp meters here

Kingrow1 said:

Is your hygrometer under or in the light? If it is wrong place and why daytime humidity drops. Quite often the case with hygrometer and temp meters here

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It is under the light at the top of my plants

Thats fine......make sure you have good airflow , intake , outtake , good strong fan , I also run all my fans 24x7

I actually used an 18 inch pyrotechnic fan in my 1.2x1.2x2m tent , little bit of wind burn on ones near it but........been up to 70-80% RH at times especially after watered and they are fine.

Airflow is the key , and slow temperature drops , its really fast temp drops with high RH spikes that causes mold.

Its not bad at all , sure it could be a bit dryer , but ive stopped using my dehumidifer and everything is fine. Just did an SLH grow went 16 weeks flower and was around 55-70% most of the time

Kilbarrack said:

It is under the light at the top of my plants

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Bingo this is wrong - remove it to a shaded location.

At the moment you have no conception of light radiation warming the meters and throwing of readings.

Read only the air not the light - I can help growers set up a tent properly not just guess work and broscience

Kilbarrack said:

But I read anything above 60% is really bad. Sorry labouring the point, but I'd be sick if after getting them this far I loose them over high humidity

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Of course now, you have also read somewhere that over 60 RH is fine...

Kingrow1 said:

Bingo this is wrong - remove it to a shaded location.

At the moment you have no conception of light radiation warming the meters and throwing of readings.

Read only the air not the light - I can help growers set up a tent properly not just guess work and broscience

Click to expand...

Thanks for all of you taking the time to reply!

Watching a commercial grower on YT & he was saying to make sure its at the top of your plants to get a true reading of temps. He said putting it against the wall is no good. I probably need to buy another 1/2 meters & put them around my tent.

Thanks for the help!

Kilbarrack said:

Thanks for all of you taking the time to reply!

Watching a commercial grower on YT & he was saying to make sure its at the top of your plants to get a true reading of temps. He said putting it against the wall is no good. I probably need to buy another 1/2 meters & put them around my tent.

Thanks for the help!

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The commercial grower is wrong im right.

We do not want dorect or indirect light on our meters.

The met office who read the weather use a stephenson screen to shade all light of their hygrometer and thermometers so theres one hint that commercial grower knows shit.

Trust me and google what conduction convection and radiation are at the same time for more of the science.

Commercial growers lol, ignore these fools so stuck in their own toxic market

Kilbarrack said:

But I read anything above 60% is really bad.

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If it's that way all the time, yes. Ideally, you want to keep it below 60% because of the risk of mold and mildew setting in. A few hours per night shouldn't be that harmful though, especially now that you've got it managed with a dehumidifier.

I wouldn't worry too much about it. You've got it handled.

Kingrow1 said:

The commercial grower is wrong im right.

We do not want dorect or indirect light on our meters.

The met office who read the weather use a stephenson screen to shade all light of their hygrometer and thermometers so theres one hint that commercial grower knows shit.

Trust me and google what conduction convection and radiation are at the same time for more of the science.

Commercial growers lol, ignore these fools so stuck in their own toxic market

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What you say makes sense. But Im a first time grower & I can point you to 20 different opinions any any growing subject! Im trying to get all different opinions from everyone.

Kilbarrack said:

What you say makes sense. But Im a first time grower & I can point you to 20 different opinions any any growing subject! Im trying to get all different opinions from everyone.

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Ignore him. He's wrong the vast majority of the time. Check out his post count vs his likes. Nobody likes anything he says because it's flat out wrong the vast majority of the time.

In fact, save yourself his bullshit and add him to your ignore list like everyone else has.

Kingrow1 said:

The commercial grower is wrong im right.

We do not want direct or indirect light on our meters.

(Fixed your typo also)

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It's not so much you're right they're wrong as much as they have better shit! Their fan driven aspirated thermistor, hooked up to an environmental supercomputer controller, blows away the big box accu-rite sensors. It makes sense to run it at canopy if you got the shit to read it accurately.

TacoMac said:

Ignore him. He's wrong the vast majority of the time. Check out his post count vs his likes. Nobody likes anything he says because it's flat out wrong the vast majority of the time.

In fact, save yourself his bullshit and add him to your ignore list like everyone else has.

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Two facts you again are short off -

1- Many of us long term members lost a lot of our likes and posts in the site swap over - not exoecting you to know that as your very green here imo.

2 - We all know we can make like and post count threads and jack are ratings up to super pro high - except no one gives a turd about that only you.

Its not just growing you suck at but also general site knowledge.

Be carefull who you low blow

Juiceifer said:

It's not so much you're right they're wrong as much as they have better shit! Their fan driven aspirated thermistor, hooked up to an environmental supercomputer controller, blows away the big box accu-rite sensors. It makes sense to run it at canopy if you got the shit to read it accurately.

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Simply we dont want to read light radiation and this dosent heat the air but a surface it strikes.

Somewhere along the line a lot of peeps started this hobby but neglected to google what heat was and the three properties - radiation conduction and convection.

Not even im right they ate wrong its more 100% science is right and they cannot circumvent radiation with super computers.

Leaves like it hot fyi - radiation - still fuck all to do with air temps but by all means place your thermometer close to a light....

Kilbarrack said:

What you say makes sense. But Im a first time grower & I can point you to 20 different opinions any any growing subject! Im trying to get all different opinions from everyone.

Click to expand...

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