A short shower right before the start of the session forced riders to start the practice on wet tyres.

With the track drying, riders soon started to switch to dry tyres, only to have another period of torrential rain arrive and soak the track again.

Before the arrival of the second shower, Marquez was first with a 1m29.472s, having just demoted Pedrosa, who had led the majority of the session's early stages.

Marquez stayed on top for most of the session, before the track dried up enough to allow improvements in the last 10 minutes.

First it was Danilo Petrucci's Pramac Ducati that took over the lead but Aprilia's Aleix Espargaro and then Andrea Dovizioso demoted him by more than half a second.

Then it was Marquez who moved back ahead with a 1m28.451s, before he went even faster twice more.

He was still leading when the chequered flag fell, but Hector Barbera eventually outpaced him by 0.063s with a best time 1m28.115s.

Marquez settled for second ahead of his Honda teammate Dani Pedrosa, he and Petrucci setting identical laptimes in third.

Aleix Espargaro was fifth ahead of LCR Honda's Cal Crutchlow and championship leader Dovizioso on the best of the works Ducatis.

Jonas Folger took eighth as his Tech 3 Yamaha teammate Johann Zarco was the only rider to crash in the session, falling during the second shower.

Sam Lowes brought a second Aprilia into the top 10 in ninth, ahead of Ducati's Jorge Lorenzo.

The factory Yamaha riders had a low-key session, with Valentino Rossi and Maverick Vinales only 15th and 20th respectively in the rain.

Second practice results:

Pos.	#	Rider	Bike	Time	Gap
1	8	Hector Barbera	Ducati	1'28.115
2	93	Marc Marquez	Honda	1'28.178	0.063
3	26	Dani Pedrosa	Honda	1'28.468	0.353
4	9	Danilo Petrucci	Ducati	1'28.468	0.353
5	41	Aleix Espargaro	Aprilia	1'28.527	0.412
6	35	Cal Crutchlow	Honda	1'28.616	0.501
7	4	Andrea Dovizioso	Ducati	1'28.753	0.638
8	94	Jonas Folger	Yamaha	1'28.988	0.873
9	22	Sam Lowes	Aprilia	1'28.994	0.879
10	99	Jorge Lorenzo	Ducati	1'29.017	0.902
11	19	Alvaro Bautista	Ducati	1'29.076	0.961
12	44	Pol Espargaro	KTM	1'29.321	1.206
13	76	Loris Baz	Ducati	1'29.364	1.249
14	36	Mika Kallio	KTM	1'29.446	1.331
15	46	Valentino Rossi	Yamaha	1'29.549	1.434
16	43	Jack Miller	Honda	1'29.586	1.471
17	17	Karel Abraham	Ducati	1'29.774	1.659
18	5	Johann Zarco	Yamaha	1'29.927	1.812
19	38	Bradley Smith	KTM	1'29.972	1.857
20	25	Maverick Viñales	Yamaha	1'30.017	1.902
21	45	Scott Redding	Ducati	1'30.017	1.902
22	42	Alex Rins	Suzuki	1'30.342	2.227
23	53	Tito Rabat	Honda	1'30.508	2.393
24	29	Andrea Iannone	Suzuki	1'30.559	2.444