Can Hot Air Balloons Fly in the Rain? A Sonoma Pilot’s Answer

Can hot air balloons fly in the rain? No. When it's raining at launch time, we don't fly. Our FAQ puts it in four words: fog, rain and high winds ground us.

That's the short answer. The longer one explains why, what a "wet" morning really looks like in Sonoma, and what happens to your booking. It matters more this year, because the forecasters are talking about a wet winter.

Why can't hot air balloons fly in the rain?

A balloon has no windshield wipers, no instruments to fly by, and no way to simply climb over a problem. The pilot flies by sight. Rain gets in the way of that in a few plain ways.

• Visibility. Rain cuts how far the pilot can see. The pilot needs to spot power lines, trees, roads, other aircraft, and a safe field to land in.
• Low cloud. Rain usually comes with cloud that sits low. Balloons have to stay clear of clouds, and a low ceiling leaves no room to fly.
• Overnight rain. Even after it stops, wet air can leave low cloud and mist behind. One UK operator notes that overnight rain often forms low-lying cloud that hinders the view.
• Storms. The same operator says it can't fly in storms or cumulus cloud because of poor visibility and the potential damage of flying in the rain.

There's a federal rule underneath all of this too. Under 14 CFR 91.155, aircraft flying below 1,200 feet above the ground in uncontrolled airspace during the day need at least one statute mile of flight visibility and must stay clear of clouds. Balloons don't get an exception. A steady rain or a low gray deck can end the conversation before it starts.

What about light drizzle or a sprinkle?

This is the question we hear most. Honest answer: it depends on the whole picture, and the pilot makes the call at the field. A few drops at check-in on an otherwise bright, calm morning is not the same as a gray ceiling with a front moving in.

What the pilot is weighing:

• Is it actually falling, or just damp air?
• How high is the cloud base, and is it lifting or dropping?
• What's the wind doing, now and a few hundred feet up? Wind is the other big one.
• Can we see far enough to fly and land safely?
• What does the radar show for the next hour?

If it's raining at the field and more is on the way, the answer is no. If it's a passing shower and the sky behind it is clear, the pilot may wait a bit and look again. Nobody can promise you either result from the evening-before forecast, and we won't try.

Is rain a bigger problem than fog?

They're cousins. Fog is cloud on the ground. Rain is cloud that has let go of its water. Both take away what a balloon pilot needs most: a clear view. We wrote up the fog side in Can Hot Air Balloons Fly in Fog?, and the rules of thumb are the same. Calm and clear is a go. Wet and gray is a wait or a no.

Wind is the one that surprises people. A morning can look perfect from the parking lot and still have gusts higher up. Our piece on how we keep you safe goes through how the weather calls get made.

When does Sonoma's rainy season start?

We fly sunrise flights year-round, and the wet months are part of the calendar. Fall and winter bring the storms, and in between the storms you get some of the clearest, calmest mornings of the year. Rain moves through, the air cleans up, and the vineyards sit green and still.

This winter has people watching the forecast closely. In an August update reported by KTVU, NOAA's Climate Prediction Center said its winter outlook was consistent with a "very strong" El Niño in the background, and raised the chance of above-normal rain across much of coastal California for December through February, including the Bay Area. Forecasters said the effects should build slowly in late fall before ramping up in the core winter months. Outlooks are odds, not promises, and they say nothing about any single morning. But it's a fair reason to plan with a little slack.

What happens to your booking if rain cancels the flight?

You aren't charged. Our cancellation policy says guests are not charged for flights canceled because of inclement weather, and we make every effort to reschedule you. If we can't find a day that works while you're in town, our FAQ says you're refunded in full.

The pilot's decision is final, and it's made for one reason: safety. We'd much rather call it early than put you in a basket when we aren't comfortable. We also call or text you the evening before your flight to confirm. Answer it. If the forecast is rough, that's often when you'll hear first.

How to plan around a rainy forecast

• Build in a spare morning. If you're in town for three nights, don't book the flight on the last one. Two possible sunrises beat one.
• Fly midweek if you can. Join-in flights are $265 per person Monday to Thursday and $285 Friday to Sunday. Midweek is cheaper and gives you weekend backup days.
• Keep the rest of the day loose. The flight runs 45 to 60 minutes, with a champagne toast at the end. Hold brunch and tastings until you know you're flying.
• Don't cancel yourself. A rainy forecast the night before is not a decision. Wait for our call or text and head to check-in unless we tell you otherwise.
• Dress for a damp morning. Wet grass, cool air. Closed shoes and a warm layer you can shed. The pre-flight page has the details.

Check-in is at Sonoma Skypark, 21870 8th St E, Sonoma, CA 95476. It's about 45 minutes from the Golden Gate Bridge. Rain in San Francisco doesn't tell you much about the field in Sonoma, so give yourself time and let the pilots decide.

Is a clearing storm worth flying after?

Often, yes. The morning after a front passes can be the sweet spot: still air, sharp light, and washed-clean views of the hills. Not every post-storm morning cooperates, and some leave fog or low cloud behind. But if you have flexibility, those are mornings worth waiting for. You can see where we usually end up on our where we fly page.

What if you're booking a group or a special occasion?

Plan the same way, with more cushion. For proposals, birthdays, and anniversaries, give the date a backup morning. For groups, we can spread guests across consecutive sunrises, and we hold up to 70 guests per morning. Our group page has the details, and you can ask for a quote there. If you'd rather talk it through, call us at 707-819-9223.

Not sure which flight to pick? The packages page lays out join-in, private VIP, and group options, and how to book walks through the steps.

The bottom line on rain and balloons

A balloon can't fly blind, and rain takes away the view. If it's raining at launch time, we stay on the ground. If it's a passing shower, the pilot looks at the whole sky and decides. A weather cancellation costs you nothing, and a spare morning in your plans turns a rainy forecast into a minor detail.